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Posted on Nov 30, 2013

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2 Answers

3.8l. How much compression should it have?


most standard engines run a compression of around 155 -165 psi with no more than 10% variation between cylinders

Mar 12, 2016 | 1995 Buick Park Avenue

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What is the compression reading for nissan Na20 engin


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Jan 27, 2016 | Nissan Cars & Trucks

1 Answer

How much compression should a Cushman truckster with a omc engine have


cranking compression pressure is 130psi engine hot.
go on line , type in marin.edu and there is a full manual for the engine.
I found it by going google and typing in--- compression pressure for cushman truckster omc engine.

Feb 07, 2015 | Cars & Trucks

1 Answer

What is the compression for each cylinder for dihatsu charade 3 cyl 1986


most petrol engine run 145psi ( low compression engines) to around 165 psi (high compression engines) regardless of the compression read there should not be any more that 10% difference between adjacent cylinders Hugh differences in cylinders indicates valve problems

Sep 28, 2014 | Cars & Trucks

1 Answer

93 Ford Ranger 4cly. running rough and back firing out exhaust, has had a tune-up. Could the Mass Airflow cause this problem, no change in engine when unplugged.


Timing may be off. Have you checked it? Back firing could be valve timing problem; could also be too much gas-check injector spray pattern-should see a cone shaped pattern of fine mist on the throttle plates when cranking engine-this is if you have throttle body injection.
For $20-$30, you can buy a compression gauge tester and check engine compression. On a warmed up engine, pull all spark plugs, disable ignition and fuel delivery (pull injector fuse or unplug injectors), hold throttle wide open, and check compression on each cylinder by cranking engine over about 7-10 revolutions-the same amount for each cylinder, about 4-5 seconds each. All cylinders should be nearly even and balanced. Lowest cylinder should be at least 75% of highest reading cylinder. For any low reading cylinder, put a squirt of oil (about a tablespoon) in that cylinder and retest compression: if compression rises, rings are worn. If compression does not improve, valves are the reason for low compression-valves may be burnt or not sealing good.
I would do the compression test-on an engine that old, before putting expensive parts into it, you should know if the engine's internal mechanical condition is good first.

Oct 13, 2013 | Cars & Trucks

1 Answer

What is the factory specified max. compression, new motor, GM 4.3 ltr, V6


Interpreting the Results
of the Engine Compression Test.The idea behind the Engine Compression Test (in the case of a Misfire Condition or Rough Idle Condition) is to find out if any one engine cylinder is not contributing 100% of its power to the overall engine output. If only one cylinder has lower than normal compression, your GM 4.3L (or 5.0L, 5.7L) equipped vehicle will run rough or cause a Misfire Code to set and turn on the Check Engine Light.
So then, to wrap things up, the individual cylinder compression readings of each engine cylinder can not vary more than 15%... and this is how you can find out:
  1. 1Grab a calculator and multiply the highest compression reading that you recorded by .15.

    So, let's say that cylinder #4 gave you the highest reading of 170 PSI. Well 170 X .15 gives you 26 (25.5 rounded off).
  2. 2Now, the next step is to subtract 26 from 170... which gives us 144 PSI.
  3. 3So then, 144 PSI is the lowest possible compression reading that any one of the rest of the engine cylinders can have. Any compression reading below this.. and that engine cylinder will misfire..

Sep 30, 2012 | 2006 Chevrolet Silverado 1500 2WD

1 Answer

When starting the engine, the engine turns until comression then stops. If I manually turn the engine back it does the same for several attempts and eventually starts.


Hello,

Your compression release is not working as it should. On some saws, the compression release is a manual lever / button that is pressed before starting attempts. Sometimes it is tied into the choke. Other saws have an automatic compression release, based on a centrifugal cam.

If you are able to rotate the engine through the compression cycle, then the release "lobe" is likley worn. If you are not able to rotate the engine through the compression cycle, then the release mechanism is jamming.

Sep 09, 2010 | Garden

2 Answers

How do you check compression


A compression test will tell you if your engine has good compression. An engine is essentially a self-powered air pump, so it needs good compression to run efficiently, cleanly and to start easily.

As a rule, most engines should have 140 to 160 lbs. Of cranking compression with no more than 10% difference between any of the cylinders.

Low compression in one cylinder usually indicates a bad exhaust valve. Low compression in two adjacent cylinders typically means you have a bad head gasket. Low compression in all cylinders would tell you the rings and cylinders are worn and the engine needs to be overhauled.

HOW TO CHECK COMPRESSION
Compression can be checked two ways: manually with a compression gauge, or electronically with an engine analyzer the measures cranking compression. With electronic testing, a computer analyzer estimates compression in each of the engine's cylinders by measuring slight variations in engine cranking speed.

The results correlate well with actual gauge readings, and can be completed in a matter of minutes without having to remove any spark plugs. What's more, the analyzer prints out the results of the compression test making it easy to see and compare the actual numbers.

To check 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. The throttle must also be held open.

The engine is then cranked for a few seconds using a remote starter switch or a helper 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.

The individual cylinder readings are then compared to see if the results are within specifications (always refer to a manual for the exact compression figures for your engine because they do vary from the ballpark figures quoted earlier).

IS IT THE RINGS OR THE VALVES?
If compression is low in one or more cylinders, you can isolate the problem to the valves or rings by squirting a little 30 weight motor oil into the cylinder through the spark plug hole and repeating the compression test. The oil temporarily seals the rings.

If the compression readings are higher the second time around, it means the rings and/or cylinder is worn. No change in the compression readings would tell you the cylinder has a bad valve.

Hope this help (remember comment and rated this).

Apr 20, 2010 | 1998 Ford Contour

2 Answers

Loss compression


How to Test Engine CompressionAn engine depends on an equal compression reading in each cylinder to run smoothly. If poor compression exits in one or more cylinders it can cause a rough idle condition and low power. A compression test can be performed to check wear or internal damage. To start a engine compression test gauge is needed. There are two types of gauge styles, one threads into the spark plug hole which is more accurate. The other style of gauge is constructed with a rubber plug that is meant to be pressed against the spark plug hole, this style of gauge is difficult to use. To perform a engine cylinder compression test follow the steps below.
  • Remove ignition coil connector or ignition system fuse to disable power to the ignition system
  • Test ignition system to ensure that the power to the system has been disabled
  • Remove #1 cylinder spark plug and insert compression gauge, most gauges have a hose attachment that is installed into the spark plug hole with the gauge connecting to the gauge hose.
compression_gauge.jpg
Engine Cylinder Compression Gauge
  • After the compression gauge has been inserted, use the starter to crank the engine over for about five seconds. Use about the same five seconds to test the remaining cylinders.
  • Record the compression reading as each cylinder is tested
  • Remove the compression gauge and reinsert the spark plug
  • Follow this procedure until all cylinders have been tested
  • Compare cylinders compression reading, all readings should be within about 5% of each other
If low compression exists a cylinder malfunction exits and further inspection is required. Possible causes for a low compression condition are: burned intake or exhaust valve, broken piston or piston ring, broken valve spring or a blown head gasket.

May 31, 2008 | 2000 Hyundai Tucson

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