I had a quick search on Honda-Tech and couldn't get a definite value for the factory compression value, in PSI, for the JDM H22A. Does any one know what the manufacturers’ average PSI rating was for the 10.6:1 H22A motor?

I did my Ludes compression for the first time since I got it (55'000Km after I got it! Its a 1991 4th gen BB1 with the H22A ) and the values were:

-Cylinder 1- 220PSI
-Cylinder 2- 230PSI
-Cylinder 3- 210PSI
-Cylinder 4- 225PSI
So that gives a average compression of 221PSI across the 4 cylinders.

The values seemed really high considering the 195'000km's that the motor has done, so i was just wondering if any one has the actual values that Honda released? I checked my service manual and couldn't get the correct value (it said the compression should be between 150-170PSI from factory but that must be for the US H22A or even tthe F22A)

Thanks for your time

 

You probably have carb build up, in your cylinders causing you to get a higher than normal reading. Use some seafoam and then do the test again.

 

Compression numbers in psi vary greatly in different areas as well as with different gauges. The point is, your numbers are well within 10% of the average, so your engine is fine. Leave it at that.

I do NOT reccommend using a product like seafoam. Too many horror stories for me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">

I do NOT reccommend using a product like seafoam. Too many horror stories for me.</TD></TR></TABLE>

Hmmm....i picked up ~6mpg in my Civic with 2 cans of it and passed emission with flying colors.
Were they Seafoam horror stories or stories where people just blamed their own stupidity on Seafoam because they did it within 100,000 miles of their problem?
I also have to add after a seafoam treatment in my DD Lude that I passed emissions with cams/chipped ecu and got 29mpg@80mph when I went to Ohio.

On point though.....CT #'s are all about range and not the actual numbers from what I know.

 

Didn't think that you could get carbon build up in the cylinder itself, wouldn't it burn clean when its warmed up? I would have thought that the cylinder rings would keep the side walls clean but as for the piston itself it wouldnt surprise me if that had some carbon build up on it. My compression meter was a good one, cant recall the brand, but cost $60. Might try some carb/throttle cleaner to see if that makes any difference.

Either way the Lude still runs great so all must be well in the cylinders. Still wondering what the compression would have been from factory though.

Thanx for the help

 

Did you read my post at all?

The factory would have gotten different numbers, you CAN NOT compare them across the board. Elevation, gauge, climate, all play a part. Read again. YOU CAN NOT compare compression psi numbers across the board.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BB1 H22A LUDE &raquo;</TD></TR><TR><TD CLASS="quote">Didn't think that you could get carbon build up in the cylinder itself, wouldn't it burn clean when its warmed up? I would have thought that the cylinder rings would keep the side walls clean but as for the piston itself it wouldnt surprise me if that had some carbon build up on it. My compression meter was a good one, cant recall the brand, but cost $60. Might try some carb/throttle cleaner to see if that makes any difference.

Either way the Lude still runs great so all must be well in the cylinders. Still wondering what the compression would have been from factory though.

Thanx for the help </TD></TR></TABLE>
DUOH!