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What is the normal cylinder compression psi for the honda j30a5 engine?

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160-180 psi

Posted on Sep 27, 2009

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Posted on Jan 02, 2017

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What should the cylinder compression be for a 1914cc vw engine when using a compression gage in spark plug hole


Don't know the specs for it, but it has to be over 100psi in each cylinder for the cylinder to fire and produce power. Less than that and it is questionable if the cylinder will even fire.
Do all of the cylinders. If the lowest reading is within 75% of the highest reading, then it is good.
Example- Nissan engine had highest reading of 160 psi, and lowest was 145 psi. That was a good engine with normal power. Another Datsun engine had highest 140 psi and lowest of 125 psi. Also a good running engine, but you could tell the power was just slightly reduced compared to a newer engine. Your VW should be somewhere in this range, the higher above, say, 140 or 150 psi, the better. If below 100psi, then probably internal mechanical problem.

Feb 17, 2017 | Cars & Trucks

1 Answer

Low overall compression in 1996 honda accord 4cyl 129.75 psi avg.


the compression pressures are on the low side. The indications are worn rings as the pressure readings come up when the ring seal is improved with the addition of oil. The bores will be worn in a taper and if the head was to come of there would be a noticeable lip where the top ring stops in the cylinder
rings and cylinders wear equally but rings suffer from a loss of tension, and an increased ring gap that allows more compression to escape to the sump
Do you need to do something about it--
if there is an oil consumption problem( smokey) then yes
If the economy is acceptable to you then --no --not immediately
What should you consider in making a decision----
1. good engines are available from japanese spares ( imported engines with less than 30.000klms on the engine for a fair price
2. consider what is termed a "short motor" which is the block,crank, pistons ,rings,oil pump and sump all new
What you should not consider is a quickie fix--set of rings and nothing else as this will cost you more in the long run.

Feb 20, 2015 | 1996 Honda Accord

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Popping on acceleration


It could be a problem in the valve train. For a car that old, before putting new parts in, you could buy a compression tester for about $30, and do your own compression test. It should tell you if the engine is good enough internally to warrant proceeding. If compression is low on any cylinders, that problem must be addressed first. If a valve is not sealing and causing the popping, that cylinder will show low compression.
For the test, the engine should be at normal operating temperature. Then pull all the plugs out, connect tester to #1 spark plug hole. Have a helper hold the throttle wide open while cranking the engine over about 5 seconds. Watch the gauge-the first revolution or two will cause the gauge to jump high at first, and successive revolutions during the 5 second span will cause the needle on gauge to climb a little each time. Record or note the compression on #1, then do each cylinder. Try to do the same amount of cranking on each cylinder, and keep the throttle wide open. What you want are compression readings on each cylinder that is well above 100 psi, and all should be close. The lowest reading should be within 75-85% of the highest reading cylinder. Example: say your highest reading is 135 psi. 85% of 135 is 115-so your lowest reading should be at least 115 psi. Some general guidelines: any cylinder with compression below 100 psi is definitely a problem-that cylinder will not have hardly any power output, even if it is firing. Worn piston rings or poor valve sealing is causing compression loss. A newer engine should have compression readings above 150 psi. As the engine wears, compression will drop. In general, for high mileage engines, you would want to see compression in the range of 125-150 psi, the higher the better, but remember, it should be balanced-the lowest should be at least 75% of the highest reading cylinder.
Post back if you have questions-good luck.

Jan 26, 2014 | 1983 Oldsmobile Firenza

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

MY CAR VIBRATES ROUGHLY SITTING STILL AND I WANT TO KNOW IF IT HAS ANYTHING TO DO WITH THE PISTONS.


Sound like a cylinder miss, the only way to know for sure if it's a piston, is to do a cylinder compression test, should all read about 125 psi or more, or it could also be a bad motor mount.If cylinder compression check out good, could need just a tune up, as far as the engine if compression good engine is good, also check injector's

Jun 28, 2010 | 1990 Honda Accord

1 Answer

Would like to know what the cylinder compression should be on a 1994 Saturn Sl2 engine. 1.9L DOHC.


No cylinder reading should fall below 1241 kPa (180 psi). Perform compression test with engine at normal operating temperature. Hope this can help.

Apr 09, 2010 | 1993 Saturn SL2

1 Answer

Timing belt belt broke honda accord 93. First we cant get the bottom pulleys nut off and how do u knw if i hurt my engine?


You are either going to have to use an air impact wrench, or firgure out a way to keep the crankshaft from turning. When you say you can't get the nut off I'm assuming it's because you can't keep the crank from turning. Maybe wrap a nylon strap around the pulley and figure out a way to anchor the strap or use a block of wood make a wedge. To tell if you hurt the engine you are going to have to put a timing belt on the engine, then get a compression gauge and check the compression. If you have close to the same amount of compression in each cylinder I would think the engine is OK. You should have about 160 PSI of compression on that car, I would think, and not more than 25 PSI variation from one cylinder to the next.

Jan 10, 2010 | 1993 Honda Accord

1 Answer

I need to know what the compression specs are for a 1994 351W Fuel Injected Ford Bronco.


Minimum compression is 100 psi @ 200 rpm. The lowest cylinder reading should not be less than 80% of the highest reading. Perform the compression test with engine at normal operating temperature, spark plugs removed and throttle wide open. Normally I look for about 170 psi to 180 psi.

Dec 16, 2008 | 1994 Ford Bronco

1 Answer

High compression in 1 cylinder of a 170 ci. 40 psi high.


Hi!

Per the Ford manual, the acceptable range is 155-195 PSI. It sounds to me like you don't have a compression issue with this engine (without knowing the exact readings for each cylinder). Normally one cylinder being higher than the others, but still within spec, would not concern me a lot. Had one been much lower, then I think that might be cause for concern. There could be many reasons for the one hole being higher. If the engine hasn't been rebuilt in a long time, there could be carbon deposits in the compression chamber. There are many chemical fixes for this availble at your local parts store. If the engine is running fine with no pinging or detonation, I'd just continue to enjoy your classic ride (I own a 1971 Challenger converitble with a 440-6 pack, so I understand the joy of a classic car!).

Good luck and please let me know if this helps!

Bob

Oct 10, 2008 | 1965 Ford Mustang

1 Answer

Security system/battery


plz check the following and update me
1. Fuel (To be exact proper air/fuel ratio, normally it is about 14/1)
2. Spark (in appropriate moment)
3. Proper timing (the valves should open and close only in appropriate time)
4. Compression in the cylinders (Normal compression is 120 - 170 psi. The engine won't start if the compression is lower than 70 - 80 psi.)

Jul 14, 2008 | 1997 Honda Accord

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