I just did a compression test on my new h22a from japan, and these are the results.
#1: 130
#2: 130
#3: 127
#4: 127

Do these figures sound right? The motor runs really good. Also, what is the compression ratio on a japanese h22a. Is it 10.6:1?

 

Nice and consistant, but pretty low numbers for all cylinders.. should be at least 180psi i would think....

 

Those are the lowest compression numbers I have ever heard of on an H22a... I was under the impression that even 180psi per cylinder is considered low on a 10:1 H22a.

Andrew

 

damn, yeah, those are low. But even all accross the board. Are you sure it was done correctly?

 

damn, maybe i did the test wrong then. I will have to try it again. Or maybe the compression test tool is messed up.

 

the main thing is that they are consistent...but there has to be some reason they are sooo low

 

LOL.. it has to be that. Cause if they were that low, then you'd be looking at oil on the end of every plug.

Did you bump it four times?

 

correct me if I'm wrong.... but the last time I did a compression check the plugs were out and the car was only rotated using the starter... Where did WOT come into play?

Then again, I may have been doing it wrong all these years.

 

Oh yeah, way low #'s. WOT is only so you have an open throttle plate. Plug should be disconnected from the coil or dizzy. Fuel pressure should be relieved too.

Ironically, I was doing compression tests on my lude last night. I'm going to rip this fawker all apart so I thought I should get some #'s before I do. In the past, i've gotten 150-155 across. Last night, my first reading was 185, I was thinking "WTF!". I proceeded to test the other cylinders, all 180's.. The car was warm too. So I let it sit and started working on some fuel ****... Come back an hour later to try the test again. this time I got the 150's I was looking for, with a cold engine. I picked up the helm to confirm the testing procedure, which I never ended up finding. I had all plugs out, relieved fuel pressure via banjo bolt, removed ecu fuse, yanked coil wire, held at WOT and cranked about 4-5 times. I think the amount of cranks should be the same throughout the test, but I was debating at lunch with a coworker about it. He thought that the cranking amount should not matter, as the engine will only take in so much air. I don't see it the same way. We know air can compress, and all you're doing with this gauge is pumping in air to the cyl(compressing it) and holding it. Wouldn't it make sense that the # will keep rising? In the past i've been in the habit of cranking 4 times only for consistency.

My tests are done with a thick head gasket(8.8~9:1) per the helm, 185 is ideal and 130 is the lowest. I've heard people with h22a's be in the 200's; which seems odd. Bottom line, I think there are many variables to a compression test.

 

I do mine almost the same way except with the motor hot, 4 complete strokes and no dizzy/fuel interference (dizzy=dist, right? That's cool... Brian says dee-peezy for the------- --------). The more you crank, the higher the pressure goes. A bit important is the amt of the first pressure jump.......

 

Dam,does it even run?? My results were 235psi across.just make sure the dist. is disconnected,plugs out,gas pedal all the way down.At least 5 strokes should do it.

 

ok check this. the timing is off by a little. the reason being that when the tensioner was put in, it threw the timing off by a couple of teeths on the cam gear. so i'm thinking that my timing has to do a little with it. Since when the engine is warm, the idle is too low. So i'm going to fix the timing and retest it. I also did the test when my engine was cold. Does it make a difference if the motor is cold or hot?

 

sup quan, its justin, yeah those numbers seem low, my h23 had higher compression than that. the last time i did mine was i believe 175 on all 4 but then again my compression ratio is higher

 

oh yeah, and yes its take plugs out, and 5cranks only