Did compression test, bad #'s?? - Honda Prelude Forum

Gmachine · 06-05-2006, 10:20 AM

I got 130-145 on all cylinders. From what I'm reading this is bad for a 5 gen?

Vapor · 06-06-2006, 07:28 AM

it is.

But are you sure you did it right? Warm engine, WOT while cranking?

Prelude1897 · 06-06-2006, 08:25 AM

That's bad, but nothing as bad as my old motor

RedLadyLude · 06-06-2006, 09:55 PM

doesnt matter if you WOT while cranking. I've done it and there is no difference. BTW i just did mind and i got 210 on all cylinders.

Vapor · 06-07-2006, 07:41 AM

Quote:

Originally Posted by RedLadyLude

doesnt matter if you WOT while cranking. I've done it and there is no difference. BTW i just did mind and i got 210 on all cylinders.

I tested 250 on all 4. If I didn't hold the plate open, starting at about 180 the movement would go REALLY slow. Slow enough that if someone didn't know what to expect, or was only cranking a set number of times, would think my results were 180.

It does indeed make a difference.

I found testing cold vs warm made a difference as well.

marcucci · 06-07-2006, 12:32 PM

Quote:

Originally Posted by marcucci

Here it is, in 5 easy steps:

1) warm up engine
2) remove input to coil
3) remove all plugs
4) install compression gauge
5) hold throttle wide open, crank for at least 7 seconds

Anything less and you will get incorrect readings. 150-ish, if that's true, means you've got significant problems.

RedLadyLude · 06-07-2006, 08:33 PM

Quote:

Originally Posted by Vapor

I tested 250 on all 4. If I didn't hold the plate open, starting at about 180 the movement would go REALLY slow. Slow enough that if someone didn't know what to expect, or was only cranking a set number of times, would think my results were 180.

It does indeed make a difference.

I found testing cold vs warm made a difference as well.

250?? Correct me if I am wrong but I thought 250 compression was for JDM motors only? And 210 is the highest for USDM engines

marcucci · 06-07-2006, 10:29 PM

Highest number will depend on what you've done to it, # of miles, and condition. You should expect something above 200 on ANY H22, regardless.

Vapor · 06-08-2006, 05:07 PM

you read that correctly. 250psi. Type S pistons.

And 210 is certainly not the highest for USDM engines. I tested between 215-225 before the rebuild.

Try holding WOT, maybe 210 was low because "it doesn't matter if you hold it open."

Todd is of course, correct about the 200. Shocker.

You also want similar numbers between cylinders, no more than 5-10% difference.

marcucci · 06-09-2006, 11:18 AM

Should be a 5% difference or less.

WOT and warm vs. cold makes a fair difference. Usually 10-20 psi between the two. I also cant stress enough how important it is to allow at least 5-7 seconds to crank. Any less and you WILL get inconsistent results. You have to allow long enough for the motor to go through one full intake/compression stroke(s).

JustXtreme · 06-09-2006, 11:29 AM

is there a good write up on how to do this?

Vapor · 06-09-2006, 03:46 PM

yeah, Todd posted it above. That's really all there is to it.

Gmachine · 06-10-2006, 09:54 AM

I'll try it again. I tried it cold and only cranked over a few times. I've noticed quite a bit of smoke above 4K RPM. It's got 140K on the engine and goes through quite a bit of oil.

I'd love to do a simple rebuild on it, but have never dealt with a sleeved block before. Would a simple hone be possible? What kind of $ am I looking at for parts.

Thanks,
Ryan