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I did four test per cylinder, opinions please, is this a healthy motor? Thanks.

Test 1

distributor side__4____210
______________3____210
______________2____210
cam gear side __1____210

Test 2

distributor side__4____210
______________3____215
______________2____215
cam gear side __1____225

Test 3

distributor side__4____215
______________3____220
______________2____220
cam gear side __1____225

Test 4

distributor side__4____210
______________3____220
______________2____215
cam gear side __1____220

nwdave

My Helms shows 242 is the service spec for a B16A2.

Your engine looks nice and healthy

EDIT: Sorry, looked at the wrong number. 242 is actually the normal compression for a B16A2


Modified by delsolguy at 12:43 AM 8/7/2003

Evs-One

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Does Cylinder #4 seem low to anyone on test 2-4? It gave me a code 74 about a month and a half ago, but it hasn't showed up since.

smnowell

When I did a compression test on my old B16, I got around 250 for each cylinder. Motor was internally stock, and only mods were header, skunk2 IM, and AEM CAI. If helms says 200 is within spec, then I wouldn't worry since you are over. Just saying that I got around 250 for my particular b16....mine was the JDM SiR2 motor though, that might make a difference...

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<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16a ferio &raquo;</TD></TR><TR><TD CLASS="quote">When I did a compression test on my old B16, I got around 250 for each cylinder. Motor was internally stock, and only mods were header, skunk2 IM, and AEM CAI. If helms says 200 is within spec, then I wouldn't worry since you are over. Just saying that I got around 250 for my particular b16....mine was the JDM SiR2 motor though, that might make a difference...</TD></TR></TABLE>Since you have an SIR2, yours has higher compression, that probably explains why you got 250, plus I haven't done a valve adjustment in about 30,000 miles, it might help if I adjust them.

smnowell

see, I wasn't sure which motor you have. You are right, the SiR2 does have higher compression than the USDM counterpart, but not by much (only 0.2). Unfortunately I don't have that motor anymore, so I can't go and do an up-to-date compression test to compare to your numbers.

nwdave

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16a ferio &raquo;</TD></TR><TR><TD CLASS="quote">When I did a compression test on my old B16, I got around 250 for each cylinder. Motor was internally stock, and only mods were header, skunk2 IM, and AEM CAI. If helms says 200 is within spec, then I wouldn't worry since you are over. Just saying that I got around 250 for my particular b16....mine was the JDM SiR2 motor though, that might make a difference...</TD></TR></TABLE>

I thought a .2 compression increase wouldn't make for a 50 psi increase, so I went back and checked the Helms.

I get a big fat because the normal psi (for a new engine) is actually 242, with a maximum variation of 28 psi.

Sorry guys

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