Какая компрессия должна быть в бензиновом двигателе: замер, какая должна быть норма

Какая компрессия должна быть в двигателе автомобиля

Оптимальная компрессия в цилиндрах двигателя для дизельных и бензиновых двигателей разная. компрессия в цилиндрах двигателя гарантирует стабильную работу агрегате. Измерять ее требуется, когда поршень находится в верхней точке. От того, правильное ли давление в цилиндрах, зависит то, будет ли мотор работать. При отсутствии компрессии возможны различные неполадки, преждевременный износ при неравномерном давлении в разных камерах. Уровень данного показателя влияет на следующие факторы:

• Сгорает ли топливо целиком.
• Потребление масла двигателем.
• Правильность работы цилиндров и поршневой группы.
•  При низкой компрессии существенно повышается трение между деталями мотора.
• Чем выше показатель, тем легче заводится двигатель.
• Низкое давление приводит к потере мощности, авто практически не едет.

Многие сталкиваются с тем, что в автомобиле нет компрессии в двигателе, что делать в этом случае, подскажет наша статья.

Причины по которым компрессия может снижаться

Основной причиной можно считать систематический перегрев силового агрегата. Если закипание происходит часто, в цилиндрах и на поршнях со временем появятся задиры. Это может привести к прогоранию системы, снижению давления внутри нее. Проблема может быть и в износе колец. Диагностировать неисправность можно, так как мощность резко падает, зато повышается потребление топлива.

Компрессия в двигателе может меняться и из-за неправильно работающей ГРМ, обрыва цепи. Если прогорят клапана, их придется менять, а стоит это недешево на любом авто. Стоит отметить, что регулировка клапанов тоже играет роль: если они будут настроены неправильно, компрессия может значительно снизиться или вовсе пропадет.

При наличии небольших тепловых зазоров клапана не могут закрываться полностью, двигатель теряет мощность. Зазор не должен быть и увеличенным. Это приведет к другой проблеме – воздуха в систему будет попадать меньше, появится стук. Вызвать падение давления может и прогоревшая прикладка ГБЦ: это, пожалуй, одна из наиболее распространенных причин, выявляемых в ходе диагностирования.

На показатели может негативно влиять даже засоренный воздушный фильтр. Менять его нужно вовремя, в противном случае системе не будет хватать воздуха. В итоге смесь будет слишком обедненной, и мотор будет плохо функционировать. Еще одной причиной могут стать трещины в головке блока цилиндра. Это довольно серьезная проблема, которая вызвана в основном перегревом.

Показатели компрессии считающиеся нормальными

У каждой модели двигателя свой показатель нормы, поэтому вывести единый результат для всех невозможно. Для того чтобы узнать точные данные, требуется обратиться к инструкциям своего автомобиля. В среднем для бензиновых моторов нормой является 9,5-10,5 атмосфер, а компрессия в дизельном двигателе – 28-32 атмосфер. Такая большая разница объясняется не только конструкцией моторов, но и типом топлива, температурой, при которой оно сгорает. Степень сжатия влияет на экономичность и мощь силового агрегата. Чем она выше по заводским параметрам, тем лучше, но искусственно поднимать ее тоже не стоит, так как это приведет к поломке двигателя.

Как проводить замеры

Важную роль играет то, при каких условиях были произведены измерения. Дело в том, что показатели могут быть разными в зависимости от параметров и метода их снятия. Определить, какая компрессия должна быть в дизельном двигателе или бензиновом моторе, можно не только по типу топлива. Результат может зависеть от следующих обстоятельств:

• Количество воздуха, поступившего в цилиндр.
• Был ли прогрет мотор и до какой температуры.
• Вид двигателя (карбюраторный или инжекторный).
• С какой частотой вращается коленвал.
• Вязкость масла: чем она выше, тем степень сжатия воздуха будет больше. Если показатели компрессии, наоборот, повышенные, а пробег авто при этом составляет более 250 000 км, это значит, что на стенках цилиндров скопился толстый слой отработанного масла. Камера сгорания в результате становится меньше по объему, снижается тяга, но компрессия при измерениях остается в норме.

При определенных условиях возможно отклонение результата в большую сторону. Причины могут быть следующими:

• В камере сгорания находится в большом количестве масло.
• Двигатель перегрелся или слишком хорошо нагрет.
• Дроссельная заслонка открыта все время.

Периодичность проведения измерения

Проверка компрессии в цилиндрах двигателя рекомендована каждую замену масла, то есть раз в 10 тысяч км. Записывая показания, вы сможете отследить динамику изменений и точно определить состояние силового агрегата. Конечно, многие не проводят измерений так часто, ограничиваясь 40 тысячами км.

Регулярная проверка поможет избежать и предотвратить многие проблемы, так как компрессия обычно снижается постепенно, что говорит об излишних накоплениях масла в цилиндрах, появлении зазоров, прочих следов износа.

Правильно обращаться с компрессором

Прежде чем начать работу, требуется изучить теорию, как правильно пользоваться прибором, и обратить внимание на следующее:

• Перед работой мотор нужно прогреть до температуры не выше 40-60 градусов по Цельсию. После этого требуется отключить подачу топлива.
• Аккумулятор должен быть хорошо заряжен, заряд должен быть от 12 до 14 Вольт.
• Влажность воздуха должна быть небольшой, поэтому работы можно проводить либо на улице в сухую погоду, либо в отапливаемом сухом помещении с нормальной влажностью.
• Перед тем как измерять, из всех цилиндров нужно удалить свечи. Зажигание должно быть выключено.
• Обратите внимание на то, что компрессоры выпускаются разные и могут не подходить к вашей модели двигателя, это обязательно требуется уточнить перед покупкой прибора. Дело в том, что у обычных измерительных приборов наконечник короткий, и для 16-клапанных агрегатов они не подходят.
• Замерять компрессию манометром следуют дважды. В одном случае дроссельная заслонка должна быть полностью открыта, в другом – закрыта. Разницу нужно сравнить. В идеале будет выявлена одинаковая компрессия в цилиндрах двигателя; норма не соблюдается, если в одном случае показатель резко выше, так как это значит, что двигателю нужен ремонт.
• Стоит заметить, что небольшая погрешность между разными цилиндрами допустима, это происходит из-за их неравномерного износа, однако слишком большой разница быть не должна.

Правильно сделать точные замеры

Перед тем как проверить компрессию двигателя, потребуется пригласить помощника. Свечи откручиваются, и вместо них к отверстию прижимается компрессор. После этого нужно заставить стартер провернуться. Ждать нужно 4-6 секунд, после этого зажигание можно выключать. Полученное значение записывают и переходят к следующему цилиндру.

Следите за напряжением аккумулятора, он будет разряжаться от процесса, поэтому желательно, чтобы батарея была новой. После проверки давления не забудьте померить вольтаж аккумулятора: если он не выше нормы, все в порядке.

Заключение

Регулярный замер компрессии в двигателе поможет заранее выявить возможные неисправности и избежать дорогостоящего ремонта. Всегда обращайте внимание на возросший расход масла, часто он свидетельствует о том, что давление стало исчезать, а значит, мотор пора ремонтировать.

90000 How Gas Compression-ignition Engines Work 90001 90002 Advertisement 90003 90002 In summer of 2017, Mazda made an announcement: The auto company found a way to make compression-ignition gasoline engines for passenger cars. Mazda claimed its new engine could improve fuel economy by 20 to 30 percent, which is a considerable achievement for a gasoline engine. 90003 90002 Before taking a dive into this technology, it’s worth noting that the compression-ignition engine is not a new concept.Formula 1 cars use compression-ignition engines, and several other automakers have attempted to develop a commercially viable version for passenger cars. But Mazda’s engine, dubbed the Skyactiv-X, will be the first mass produced and commercially available engine of this type. Thanks to Jay Chen, a powertrain engineer with Mazda, HowStuffWorks was able to learn how this breakthrough was achieved. First, though, we have to take a look at an engine’s basic functions. 90003 90002 An engine works by igniting fuel in two ways: heat and compression.Spark-ignition engines are found in most gasoline cars. In these types of engines, the spark plugs fire to ignite fuel in the combustion chamber, while the fuel and air mixture is also being compressed. This is a very simplified version of the process, of course, just to illustrate the main difference between the two engine types. Spark-ignition engines follow a cycle and require precise timing to work, but are generally reliable under a variety of conditions [source: Knight]. 90003 90002 Compression-ignition engines operate more like diesel engines.Diesels are designed for much higher compression (which requires heavier components and stronger construction) and use glow plugs as a heat source rather than spark plugs. Glow plugs heat up the compression chamber, which in turn increases the compression within the chamber. When the fuel is added to the chamber, it’s sprayed across the tip of the glow plug, but the process relies on the compression more than the contact of the fuel and the plug. The lack of «spark» helps diesel engines achieve higher EPA ratings than gasoline engines with otherwise similar specs [source: Stewart].90003 90002 If we’re focusing on gas, you might be wondering, what’s the point of explaining how a diesel engine works? Simply, to illustrate the importance of compression. The best way to improve the gas engine is to figure out how to increase compression, which enables the engine to use its fuel supply more efficiently. 90003 90002 A compression-ignition gasoline engine combines the best parts of these processes. The engine is programmed to trap air (typically, engine exhaust) in the engine cylinder by adjusting the timing of the exhaust and intake valves.The fuel injectors add fuel to this trapped exhaust, and since the trapped mixture is under very high compression, the relatively small amount of fuel is able to ignite. 90003 90002 Compression-ignition engines can even be broken down into two different types [source: Lindberg]. 90003 90018 90019 90020 Homogenous Charge Compression Ignition (HCCI): 90021 This engine mixes air and fuel, and then compresses that mixture until it ignites. Mazda’s engine will be the first HCCI-type engine to be mass produced.90022 90019 90020 Gasoline Direct Compression Ignition (GDCI): 90021 This engine squirts the gasoline into a mixture of air and exhaust that has already been compressed. 90022 90027 90002 The main difference between these two engines is the point in the process in which the fuel is added, achieved through adjustments to the engines ‘cycles and timing. Otherwise, the engines function similarly; the compression is the most important factor. 90003 .90000 The Future of Gasoline Engines — How Gas Compression-ignition Engines Work 90001 90002 Advertisement 90003 90002 Shortly after Mazda’s announcement, auto industry experts began to speculate whether a mass-market compression-ignition engine could «save» gas engines. That is, as the industry moves more toward hybrid and electric technology, could this gas engine be efficient enough to be a viable contender? 90003 90002 Chen says Mazda is motivated by the belief that, «by squeezing every bit of efficiency out of the internal combustion engine (in conjunction with electrification once the internal combustion engine is perfected), we can deliver a method of powering the automobile well into this century that has the potential to generate the same or less ‘well to wheel’ CO2 emissions as pure battery electric vehicles powered from fossil fuel based power plants of various forms.»90003 90002 In other words, Mazda thinks that with continued innovation, a car powered by a gas engine can be at least as efficient as an electric car, and possibly even more so. Let’s take a look at how this breakthrough in compression-ignition technology is different from those that came before it. 90003 90002 In 2007, Motor Trend drove a Saturn Aura powered by a compression-ignition engine, which achieved a 15 percent reduction in fuel consumption over a regular Aura [source: Markus].At the time, GM was expecting to release a vehicle with a compression-ignition engine in 2015 року, but the Saturn brand was shut down just a few years later, and GM gradually shifted its focus to electric and plug-in hybrid vehicles such as the Chevrolet Volt. 90003 90002 Around the same time, Mercedes-Benz was working on a compression-ignition system called DiesOtto, and Ford had a project in development, too [source: Estrada]. However, neither of these engines achieved the green light for production, and Hyundai’s experience may help explain why [source: Markus].90003 90002 Aside from Mazda, Hyundai has probably made the most progress, with efforts that first came to light around 2013 [source: Markus]. The company designed its version of a compression-ignition engine without spark plugs or glow plugs, with a target release date of 2023. 90003 90002 Despite promising progress, Hyundai revealed in 2016 that the engine components just were not strong enough to deal with the compression required for the process to work. Stronger engine components, namely the block, crank and bearings, can be designed, of course; that’s how diesel engines work.It’s just very expensive, and those stronger components add weight to the car and reduce its overall efficiency. Hyundai had planned all along to use a turbocharger to increase power and maintain the necessary compression, but they discovered they’d also need a supercharger, which further busted the budget. And finally, Hyundai was not satisfied with the amount of pollution produced by these powertrains. In the end, the project was much more expensive and not nearly as clean and efficient as planned [source: Markus].90003 90002 Mazda’s development efforts have been going on almost as long as its competitors. 90003 90002 «Skyactiv-X was always in the plans even before the first generation Skyactiv was launched,» explains Mazda engineer Chen. «The first step in this roadmap was Mazda’s Skyactiv Technology [which was] introduced in 2009. The key improvement at that time was the application of unconventionally high engine compression ratio to increase overall engine efficiency as well as powertrain performance.This was achieved through a synergistic combination of existing techniques applied together to achieve what was (until then) believed impossible for production engines. «90003 90002 In layman’s terms: «Skyactiv» is the term for Mazda’s strategy of boosting compression to increase efficiency, and Mazda had to tinker around a bit to get the upcoming Skyactiv-X to work. As a result of that tinkering, Mazda added a spark plug into the mix, so the engine can switch between compression and spark-ignition depending on what is the most efficient at the time.This might sound like it goes against the basics of high-compression engine technology, but Chen says it works. 90003 90002 «This breakthrough, which we call spark-controlled compression ignition (SPCCI), greatly expanded useable range of compression-ignition operation and control as well as provided the solution for a seamless transition between CI [compression ignition] and SI [spark-ignition ] combustion modes used at high engine speeds (in the case of Skyactiv-X), «Chen says.90003 90002 Put more simply, the spark plug is the magic ingredient that enables the engine to run smoothly and adjust for different conditions, and it’ll only be used when absolutely necessary. Mazda’s engine is designed to monitor itself and adjust its operation based on factors like current environmental conditions, the way the car is being driven, and the driver’s preferences and settings [source: Estrada]. 90003 90002 After Mazda came up with this idea, it took another two years to develop the engine, during which time another important decision was made.Vehicles equipped with Skyactiv-X engines will feature superchargers to boost horsepower specs, which will improve driving dynamics and help convince potential buyers to take a chance on this new technology [source: Estrada]. 90003 90002 The last big question — when can drivers expect to see it? A spokesperson for Mazda says that the company can not yet disclose which vehicles will be the first equipped with the Skyactiv-X engine or when they’ll be available. We also do not know if vehicles powered by compression-ignition engines will cost more than comparable vehicles with spark-ignition engines.It’s safe to speculate, though, that while Mazda will be the first to market with this technology, other manufacturers are almost certain to follow. 90003 90032 Author’s Note: How Gas Compression-ignition Engines Work 90033 90002 Unlike a lot of my colleagues, I’m not especially worried about «saving gas engines,» even though that would probably help with job security. Maybe I should be a bit more selfish about that, but I decided to write about the compression-ignition engine simply because I’m intrigued by any innovation that can help make a car more efficient.90003 90002 For that reason -sustainability in general — I’m eager to test drive a vehicle with a compression-ignition engine as soon as they’re available. Like hybrids and electrics, I think there will be a lot of conversation about whether or not these vehicles are powerful enough. Honestly, I suspect the average person will not be able to tell the difference. There are a lot of ways to make a car interesting to drive aside from simply making it as powerful as possible, and that’s an area in which Mazda excels.90003 90032 Related Articles 90033 90032 More Great Links 90033 90032 Sources 90033 90044 90045 Brown, Jacob. Specialist, Product Communications, Mazda. Personal correspondence. Sept. 1, 2017. 90046 90045 Chen, Jay. Powertrain Engineer, Mazda. Personal correspondence via Jacob Brown. Sept. 1, 2017. 90046 90045 Estrada, Zac. «Mazda could have the tech to save the internal combustion engine.» The Verge. Aug. 8, 2017. (Aug. 30 2017) https://www.theverge.com/2017/8/8/16099536/mazda-compression-ignition-engine-technology 90046 90045 Knight, Cheryl.»How a Car Ignition System Works.» YourMechanic. Nov. 19, 2015. (Aug. 29 2017) https://www.yourmechanic.com/article/how-a-car-ignition-system-works 90046 90045 Lindberg, Austin. «Hyundai Developing Gasoline-Burning Compression-Ignition Engine.» Car and Driver. Nov. 18, 2013. (Aug. 30 2017) http://blog.caranddriver.com/hyundai-developing-gasoline-burning-compression-ignition-engine/ 90046 90045 Markus, Frank. «Technologue: Love Child — Driving the Ultimate Bastard Engine.» Motor Trend. Nov. 19, 2007.(Aug. 30 2017) http://www.motortrend.com/news/technologue-41/ 90046 90045 Markus, Frank. «Whatever Happened to Hyundai’s HCCI Engine?» Motor Trend. Dec. 14, 2016. (Aug. 30 2017) http://www.motortrend.com/news/whatever-happened-hyundais-hcci-engine/ 90046 90045 Mazda. «Mazda Announces Long-Term Vision for Technology Development, ‘Sustainable Zoom-Zoom 2030.'» Aug. 8, 2017. (Aug. 20 2017) http://www2.mazda.com/en/publicity/release/2017/201708/170808a.html 90046 90045 Stewart, Jack. «Mazda’s Crafty New Engine Makes More Miles From Less Fuel.»Wired. Aug. 9, 2017. (Aug. 30 2017) https://www.wired.com/story/mazda-injection-compression-skyactivx-engine/ 90046 90045 Szymkowski, Sean.» How Mazda’s SkyActiv-X engine, based on HCCI, actually works (video). «Green Car Reports. Aug. 21, 2017. (Aug. 30 2017) http://www.greencarreports.com/news/1112222_how-mazdas-skyactiv-x- engine-based-on-hcci-actually-works-video 90046 90065 .90000 Gasoline engine | Britannica 90001 90002 90003 Gasoline engine 90004, any of a class of internal-combustion engines that generate power by burning a volatile liquid fuel (gasoline or a gasoline mixture such as ethanol) with ignition initiated by an electric spark. Gasoline engines can be built to meet the requirements of practically any conceivable power-plant application, the most important being passenger automobiles, small trucks and buses, general aviation aircraft, outboard and small inboard marine units, moderate-sized stationary pumping, lighting plants, machine tools, and power tools.Four-stroke gasoline engines power the vast majority of automobiles, light trucks, medium-to-large motorcycles, and lawn mowers. Two-stroke gasoline engines are less common, but they are used for small outboard marine engines and in many handheld landscaping tools such as chain saws, hedge trimmers, and leaf blowers. 90005 Cross section of a V-type engine. 90006 Encyclopædia Britannica, Inc. 90007 90008 Engine types 90009 90002 Gasoline engines can be grouped into a number of types depending on several criteria, including their application, method of fuel management, ignition, piston-and-cylinder or rotor arrangement, strokes per cycle, cooling system, and valve type and location.In this section they are described within the context of two basic engine types: piston-and-cylinder engines and rotary engines. In a piston-and-cylinder engine the pressure produced by combustion of gasoline creates a force on the head of a piston that moves the length of the cylinder in a reciprocating, or back-and-forth, motion. This force drives the piston away from the head of the cylinder and performs work. The rotary engine, also called the Wankel engine, does not have conventional cylinders fitted with reciprocating pistons.Instead, the gas pressure acts on the surfaces of a rotor, causing the rotor to turn and thus perform work. 90005 90003 gasoline engines 90004 Gasoline engine types include (A) opposed-piston engines, (B) Wankel rotary engines, (C) in-line engines, and (D) V-8 engines. 90006 Encyclopædia Britannica, Inc. 90007 90002 Most gasoline engines are of the reciprocating piston-and-cylinder type. The essential components of the piston-and-cylinder engine are shown in the figure. Almost all engines of this type follow either the four-stroke cycle or the two-stroke cycle.90005 Typical piston-cylinder arrangement of a gasoline engine. 90006 Encyclopædia Britannica, Inc. 90007 90008 Four-stroke cycle 90009 90002 Of the different techniques for recovering the power from the combustion process, the most important so far has been the four-stroke cycle, a conception first developed in the late 19th century. The four-stroke cycle is illustrated in the figure. With the inlet valve open, the piston first descends on the intake stroke. An ignitable mixture of gasoline vapour and air is drawn into the cylinder by the partial vacuum thus created.The mixture is compressed as the piston ascends on the compression stroke with both valves closed. As the end of the stroke is approached, the charge is ignited by an electric spark. The power stroke follows, with both valves still closed and the gas pressure, due to the expansion of the burned gas, pressing on the piston head or crown. During the exhaust stroke the ascending piston forces the spent products of combustion through the open exhaust valve. The cycle then repeats itself. Each cycle thus requires four strokes of the piston-intake, compression, power, and exhaust-and two revolutions of the crankshaft.90005 90003 internal-combustion engine: four-stroke cycle 90004 An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust. As the piston moves during each stroke, it turns the crankshaft. 90006 Encyclopædia Britannica, Inc. 90007 Get exclusive access to content from our тисяча сімсот шістьдесят вісім First Edition with your subscription. Subscribe today 90002 A disadvantage of the four-stroke cycle is that only half as many power strokes are completed as in the two-stroke cycle (90029 see below 90030) and only half as much power can be expected from an engine of a given size at a given operating speed.The four-stroke cycle, however, provides more positive clearing out of exhaust gases (scavenging) and reloading of the cylinders, reducing the loss of fresh charge to the exhaust. 90005 .90000 Engine Compression — What Can Cause Low Or No Engine Compression 90001 90002 Engine Compression — What Can Cause Low Or No Engine Compression 90003 90004 An engine compression test is the most practical way to learn about the mechanical condition of your engine. 90005 90006 90007 90004 Doing a engine compression test will help you locate potential internal problems affecting engine performance. 90005 90010 90011 90004 Running rough or losing power, there may be a lack of engine compression in one or more cylinders.90005 90014 90015 90004 Internal engine damage can be detected by checking engine compression. 90005 90018 90019 90020 Leaking valves. 90021 90020 Leaking piston rings. 90021 90020 Excessive carbon buildup. 90021 90020 Broken Valve Spring. 90021 90020 Blown head gasket. 90021 90020 Worn camshaft. 90021 90020 Bent pushrods. 90021 90020 Broken timing belt or chain. 90021 90020 Hole in piston. 90021 90038 90015 90004 Though there are some other causes of low engine compression, But these are by far the most common.90005 90018 90015 You should be aware of these problems so you can make an informed decision when investing in repairs. As a rule, most engines should have 90004 140 to 160 lbs. 90005 Of cranking engine compression. Also, there should be no more than 90004 10% 90005 difference between any of the cylinders. 90018 90007 90004 Checking Engine Compression 90005 90010 90053 90015 90004 To check engine compression manually with a gauge, all the spark plugs must be removed. The ignition coil must then disabled or the high tension lead grounded.If the engine has a distributorless ignition, the ignition coils must be disabled to prevent them from firing. 90005 90018 90058 90059 90053 90015 90004 The throttle must also be held open. The engine is then cranked for a few seconds while a compression gauge is held in a spark plug hole. The maximum compression reading is noted, then the process is repeated for each of the remaining cylinders. 90005 90018 90058 90066 Engine Compression 90007 90004 A cylinder leakdown test needs to be performed if low compression is found.90005 90010 90015 90004 This will assist in diagnosing what is going on inside of the engine. 90005 90018 90007 90004 Cylinder Leak Down Testing 90005 90010 90053 90015 90004 This test pinpoints specific leakage. This test uses a set of pressure gauges with a regulating device and can quantify the percentage of leakage. This is a static test that takes more time to perform compared to a regular 90005 90004 compression test. 90005 90018 90058 90007 90004 First Engine Misfire Codes 90005 90010 90053 90015 90004 Most drivers are first alerted there may be a problem is by seeing engine misfire codes (P0300 — P0312).If you see any codes the first things to check for are fuel and ignition problems. If these do check out ok the next step is confirm proper compression. 90005 90018 90058 90007 90004 What Can Cause Low Or No engine Compression 90005 90010 90011 90004 Low Engine Compression In One Cylinder 90005 90014 90105 90004 If reading are very low in one cylinder, it is highly probable that internal engine damage exists such as: 90005 90018 90019 90020 The piston could have a broken connecting rod or a hole in it.90021 90020 There could be a stuck, burnt or leaking valve. 90021 90020 There could be a broken valve spring or a bent push rod. 90021 90020 The camshaft has excessive wear and is not opening the valve (s). 90021 90020 If the compression is low or zero on two adjacent cylinders, it would indicate a leaking gasket. 90021 90020 There is a weak sealing surface at the head to block mounting area, which basically means a bad head gasket. 90021 90020 There is a broken camshaft in an area that operates valves for two adjacent cylinders.90021 90038 90125 Valve Seat 90011 90004 Low Engine Compression In All Cylinders 90005 90014 90105 Consecutive low compression in all cylinders could mean that the problem of fuel washed cylinders exists. So, This means that the engine has had too much fuel introduced into it. As a result, all of the oil has been washed off the cylinder walls. The oil creates a sealing effect between the piston and ring assemblies and the cylinder walls of the engine block. This is common with an engine that has a ‘flooding’ problem.90018 90105 If the engine seems to run normally but is weak and puffs smoke, it could have worn piston rings. In either of these events, squirt a little oil into each cylinder, then repeat the compression test. If the compression dramatically increases then you have found the problem (s). If the compression readings do not change, then it would indicate a timing problem. 90018 90007 90004 No Engine Compression In One Cylinder 90005 90010 90011 90004 Dropped Valve Seat: 90005 90014 90015 If a valve seat cracks it will allow hot gases to leak, burning both the valve seat and the valve.Most cylinders heads are made of aluminum and expand at a different rate compared to the metal valve seat. This variance in expansion rate can cause the seat to fall out of the head. Once this has occurred the cylinder will have no compression as the air escapes into the valve port. Once detected the cylinder head must removed and replaced or repaired. 90018 90011 90004 Broken Valve Spring: 90005 90014 90015 A valve spring is responsible for closing the intake and exhaust valves once the camshaft has opened them.Over time valve springs can become brittle and break. As a result, Allowing the valve to hang open which will allow the compression to leak out. 90018 90011 90004 Dropped Valve: 90005 90014 90015 Valve keepers are two half moon pieces of metal that lock into the valve retainer holding the valve in place. If these pieces become dislodged they can fly out of the retainer. Consequently, allowing the valve to drop into the cylinder contacting the piston. 90018 90011 90004 Broken Valve: 90005 90014 90015 The head of the valve seals against the valve seat.When these valve fail the head can come apart from the stem. The head of the valve will drop into the cylinder. This will allow compression to leak from the cylinder while causing extreme damage to the piston and cylinder head. 90018 90011 90004 Piston Damage Or Hole: 90005 90014 90015 The piston may fail due to excessive heat in the combustion chamber. So, A burned piston will typically have a melted appearance; or a hole burned completely through the top of the piston. Aluminum can only withstand so much heat, and when it gets too hot, it melts.The underlying cause is usually detonation and / or pre-ignition. 90018 90168 Valve Leaking 90007 90004 No Engine Compression In All Cylinders 90005 90010 90011 90004 Broken Timing Belt or Chain: 90005 90014 90015 Every car engine needs a timing belt or chain to keep the camshaft in correlation with the crankshaft. When these parts fail the camshaft stops turning which causes the intake and exhaust valve not to open and close. Without the camshaft rotating the engine can not make compression.90018 90011 90004 Broken Camshaft: 90005 90014 90015 If a camshaft breaks it will stop the camshaft from turning much like a broken timing belt or chain. 90018 90007 90004 Low Or Zero Readings In Two Adjacent Cylinders: 90005 90010 90189 Blown Head Gasket 90015 This usually happens if there is a blown or weak head gasket. Another possibility is a broken camshaft in the area that operates valves for two adjacent cylinders. 90018 90007 90004 Conclusion 90005 90010 90015 Furthermore, The engine compression could be too high in one or more cylinders.This would be an indication of excessive carbon buildup in the engine. 90018 90053 90015 90004 Please Share DannysEnginePortal News 90005 90018 90058 .