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Location: KY, USA
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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
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06-16-2007, 01:49 PM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
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130ish, i *think*. more importantly, the cylinders should have similar compression.
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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06-16-2007, 02:09 PM
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All my cylinders are 180 psi, I guess this is good, I wasnt sure.
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1987 Porsche 944 1971 Porsche 911E..(It went home,Germany!) 1969 Porsche 912 1964 Porsche 356c..(roller) 1988 Porsche 924S (PARTS CAR) |
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06-16-2007, 02:13 PM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
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all right then. although that seems high to me.
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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06-16-2007, 02:20 PM
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Better to be high than low I would think.
 Thanks
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06-16-2007, 02:25 PM
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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.
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John '87 944 N/A (first Porsche) '95 E-350 Diesel '03 S-Type Jag 3.0 '03 Taurus SES '06 Eddie Bauer Explorer RIP SoCal |
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06-16-2007, 02:44 PM
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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.
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06-16-2007, 03:34 PM
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Yes, the fun is about to start. Is this your first 944?
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John '87 944 N/A (first Porsche) '95 E-350 Diesel '03 S-Type Jag 3.0 '03 Taurus SES '06 Eddie Bauer Explorer RIP SoCal |
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06-16-2007, 03:41 PM
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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?
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06-16-2007, 03:44 PM
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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.
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John '87 944 N/A (first Porsche) '95 E-350 Diesel '03 S-Type Jag 3.0 '03 Taurus SES '06 Eddie Bauer Explorer RIP SoCal |
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06-16-2007, 03:48 PM
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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.
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1987 Porsche 944 1971 Porsche 911E..(It went home,Germany!) 1969 Porsche 912 1964 Porsche 356c..(roller) 1988 Porsche 924S (PARTS CAR) |
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06-16-2007, 03:51 PM
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PM me your email address and I'll send over the copies. They are a larger file size. LOTS of info!
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John '87 944 N/A (first Porsche) '95 E-350 Diesel '03 S-Type Jag 3.0 '03 Taurus SES '06 Eddie Bauer Explorer RIP SoCal |
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06-16-2007, 03:53 PM
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Hey LEX, Where in Ky are you?
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1987, 944S (168,000 miles)..sold 1986, 944na. My job is a hobby. My 944's are work. |
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06-16-2007, 04:38 PM
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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.
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06-16-2007, 04:41 PM
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I'm with Bill
Join Date: Jun 2005
Location: Scottsville Va
Posts: 24,186
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Quote:
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Electrical problems on a pick-up will do that to a guy- 1990C4S |
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06-17-2007, 10:31 AM
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