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Registered
Join Date: Nov 2003
Location: Williston ND
Posts: 159
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compresion tested... what do you think
i just did a compresion test on my engine and here is what i come up with. tell me if good, bad, or normal, cuase i have no clue.
this is also my first time i did a compresion test so i may have done it wrong...  this is how i did it, after changing oil and oil filter (helped cure some of my ticking, but now i think i got exhaust gaskets leaking, exhaust nuts not tightend all the way whoops, anyway back to compresion testing)... i did each cylinder individualy  i also did these test after i let the car warm up and pulling plugs. and did them several times.with a push button i hand crafted that attached to the starter with aligator clips so i didnt have to use gogo gadget arms to turn it over and watch the compresion tester gauge. turning over once: 120 psi on cylinders #1 #2 #3 and #4 turning over twice: 140 psi on cylinders #1 #2 #3 and #4 turning over 3 times: 155 psi on cylinders #1 #2 #3 and 160 psi on #4 turning over 4 times: 170 psi on #1 and #3 175psi on #2 and #4 any other turn overs result as same as turning over 4 times +/- 5 psi. also waited after presured up to see if the psi went down on there own without hitting the release button and nope didnt... so umm whatcha think?
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85/1 944 project/restore/upgrade in process finnaly: Bursch headers and cat delete pipe. fiberwerks front bumper and rear wing cant spell forgive my "hukt on Fonix" it workt gud four mi in the process of buying a car and a half garage with a detached house and fenced in yard 03 Eclipse GS |
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05-09-2004, 11:09 PM
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That seems very close to what i got in my '84 when i did it a few months ago (mine might have been 180psi but not much more) - and i was very pleased with it, but can't offer any more 'technical' info than that!
Is your car running well? If so, i'd be happy with 170's all round. I think the Haynes manual says something about 150psi being fine. Do a search on compression and psi and see what other people got.
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Andy Lowered '84 944 no longer smokin! Lowered, adjustable KONI shocks, APE chip, K&N panel filter, Strut tower brace, Blue Fuchs (+ anything else i've not discovered yet!) http://photos.yahoo.com/shineyblue944 |
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05-10-2004, 12:11 AM
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Join Date: Feb 2001
Location: Viera FL
Posts: 5,642
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Looks like a good motor to me
AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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05-10-2004, 08:06 PM
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Join Date: Jul 2001
Location: Edmonton, Alberta, Canada
Posts: 4,530
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Don't listen to AFJuvat.....
That motor is crap...........  I will take it off your hands if you pay shipping...
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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05-10-2004, 09:47 PM
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Registered
Join Date: Nov 2003
Location: Williston ND
Posts: 159
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85/1 944 project/restore/upgrade in process finnaly: Bursch headers and cat delete pipe. fiberwerks front bumper and rear wing cant spell forgive my "hukt on Fonix" it workt gud four mi in the process of buying a car and a half garage with a detached house and fenced in yard 03 Eclipse GS |
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05-10-2004, 10:04 PM
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Join Date: Nov 2003
Location: Calgary, AB
Posts: 1,883
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Just curious, but did you pull all the spark plugs when you did the compression test?
Be happy with those numbers, mine are all about 50-70psi lower. 200ish is wonderful, 170 is perfectly good, 150 is getting troublesome, 130 it's rebuild time, 100, well, then you're me =)
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2010 Hyundai Elantra Touring, GLS 5 speed, Indigo Blue Metallic. 2.0L of Korean fury! Buy my parts! |
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05-14-2004, 12:03 AM
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Join Date: Dec 2003
Location: Chicago, IL
Posts: 158
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These gauges are not always accurate. 170+ is perfectly good, you really just want to be sure that it's pretty even across all four. If it ain't, then you've got problems to fix.
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1987 951 - Stone Gray / Burgundy 15psi Guru Chips, Reliaboost, 3-bar FPR, KW Variant 3 Suspension, OE Euro Driving Lights, Iceshark Wiring Kit |
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05-14-2004, 10:52 AM
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