Did a compression test tonight.
 

Well I bought my own Compression gauge tonight at Checker. I ran the car for approximately 8 minutes to warm it up. I held the throttle plate open during the compression test. I cranked engine over for approximately 6 rotations each hole.

Results:

#1 158
#2 155
#3 155
#4 161

This is with the stock 2g motor, 93k miles. The only internal modifications are the HKS 272 cams.

Taken that all into consideration. How do my numbers look guys?

Thanks.

Re: Did a compression test tonight.
 

Looks good to me. I believe you'd expect numbers a little lower than stock with those cams and they are all in close range.

Re: Did a compression test tonight.
 

Looks good! Nice and even, and well within spec. Checked for crankwalk lately?

Re: Did a compression test tonight.
 

Thanks guys. I checked for crankwalk last winter when I was building the car up. I couldn't really get the dial indicator to move. I did it per the vfaq instructions. I would of had to pry hard enough to bust the crank pulley in order to get the indicator needle to move. Wasn't crankwalk fixed for all 1999 cars? :)

Re: Did a compression test tonight.
 

Looks pretty good. I just posted about it on the dsmlink forum.
James

Re: Did a compression test tonight.
 

Thanks much for doing that. I had no suspicions to warrant a test. I just wanted to make sure the car is 100% before she makes a trip to Rock Falls to run my first 11 sec.

Re: Did a compression test tonight.
 

Unless the cams affect it, aren't those a bit low for a 2G? Those numbers would be good for a 1G.

Re: Did a compression test tonight.
 

Why would the cams affect it in a negative way? Wouldnt the extra lift and duration allow more air in for higher compression results?

Not saying you said the cams would affect it but since you refered to it as being a possibility I was kind of curious.

Re: Did a compression test tonight.
 

cams are not going to effect your static compression. dynamic though, is another thing entirely.

Re: Did a compression test tonight.
 

Those numbers are good enough. Turn the boost up!

Re: Did a compression test tonight.
 

Late closing of the intake valves will reduce compression at cranking speeds.

Re: Did a compression test tonight.
 

Yeah, I was thinking about that a little more last night after I posted. I would think though that the late closing of the valve would be offset by the extra lift and it wouldnt really affect compression much.

Maybe not, it just seems to make sense to me.

Re: Did a compression test tonight.
 

I did a compression test before and after changing cams. My numbers were 10-20psi lower with Crower Stage IIs.

Re: Did a compression test tonight.
 

At cranking speeds, lift has no real effect. The air flow is way too slow for lift, duration or port velocities to make a difference. It's only mechanical closing of the valve in relation to the piston's travel that will change compression at this point.

Re: Did a compression test tonight.
 

That makes sense too, thanks.

Re: Did a compression test tonight.
 

Makes sense to me too. Thanks for that additional input on this subject.

Re: Did a compression test tonight.
 

Hey Chris! I recently just had a head put together by a friends shop. It's got used valves but all checked out ok, crower II's, titanium retainers, and upgraded springs. How did the crower's perform for you?

PS sold that galant yet?

Re: Did a compression test tonight.
 

They're better then stock. I probably should have them degreed to maximize performance.

Still have the galant, someone is looking at it today. :)