1987 944 compression specs
 

Hey I picked up a 87 944, it needs the usual water pump replaced, I ran a compression test and was curious what the cylinders should be in PSI?.. I can seem to find this info anywhere. It is stock. Non turbo. Thanks

130ish, i *think*. more importantly, the cylinders should have similar compression.

All my cylinders are 180 psi, I guess this is good, I wasnt sure.

all right then. although that seems high to me.

Better to be high than low I would think. :) Thanks

Compression = (Compression Ratio minus one) to the 1.1 to 1.2 power multiplied by Atmospheric Pressure

http://www.type2.com/library/engineg/comrat.htm

That formula doesn't make a lot of sense to me with their chart with a range. Anyway...

6.5:1 is 96 -114
7.0:1 is 106 -126
7.5:1 is 115 - 139
8.0:1 is 125 - 152

That chart only goes to 8.0 and the CR for the 87 944 n/a is 9.5:1. I would guess 180 PSI to be real close to right on, if not right on, based on this info. Sounds like you should be good. And as it was already pointed out, all cylinders are close, so that is good.

When I bought the car, the guy gave me a cd manual, it seems good, looks old school, anyway It says it should have 145psi and up, found that just a few minutes ago. I also found out the water pump is locked up solid!, timing belt has some slack in it too.... oh boy the fun is about to begin.

Yes, the fun is about to start. Is this your first 944?

Yes! But I have had some history with an older 911 and a 912, I mechanic on BMW's usually, this defniately looks harder. Any advice?

I have an 87, I think they are REAL easy to work on. I see you have 88 posts, where they about this car or another car? www.clarks-garage.com. Go there, TONS of detailed info. I have a copy of the Porsche manual and the PET if you need it also.

They were probably about the 911e I had and bailed on... some were probably BMW posts also.. I work on alot of them also. I will check out the link, the manual I have is printed in germany, it acutally has alot of pictures! this helps.

PM me your email address and I'll send over the copies. They are a larger file size. LOTS of info!

Hey LEX, Where in Ky are you?SmileWavy

I am in Pine Knot, KY. Its roughly 100 miles south of lexington. About as far south as you can go and still be in ky.

Mine as well, the CR for an 87 S is 10.9-1