Compression test on prospective purchase
#1
Compression test on prospective purchase
This weekend I am doing a compression test on an FC that I may purchase. The car was in storeage. The motor has not run in a couple of years, but has been 'regularly' turned over, whatever that means. I heard the motor crank, so I know it is not locked up.
http://www.rotaryresurrection.com/ro...lder/comp.html
Is there anything special or extra that I should add to the proceedure to assure that the results are accurate for this stored engine?
Thanks
Jack
http://www.rotaryresurrection.com/ro...lder/comp.html
Is there anything special or extra that I should add to the proceedure to assure that the results are accurate for this stored engine?
Thanks
Jack
#4
Warm the engine up before you do the compression test. A cold motor wont achieve as high of compression #s.
Curious, whyd you hear it crank but not run? Or am I just assuming that you didnt hear it run?
Curious, whyd you hear it crank but not run? Or am I just assuming that you didnt hear it run?
#5
most triumphant
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Originally Posted by jackhild59
Is there anything special or extra that I should add to the proceedure to assure that the results are accurate for this stored engine?
Thanks
Jack
Thanks
Jack
i was refering to him saying anything special or extra, i assumed he would test drive, and check other areas as well, i was just pretaining (sp) my statement to his statement, if you can follow what im trying to say.
but yes, i agree he should also check coolant, and all the extra goodies.
Zak
#6
I'm sorry, I didn't explain the situation as well as I could have. The car will crank, the car will not start, so I cannot warm it up first. Of course, it ran before storage, they all do, right?
It would be a project or a partout. Since I cannot warm it up and drive it, I thought there might be something I could do like squirt a little oil in the plug holes or something to help get a good idea of the condition of the apex seals. I also don't want to do something that might make the compression test out higher than it really is.
Suggestions?
Thanks
It would be a project or a partout. Since I cannot warm it up and drive it, I thought there might be something I could do like squirt a little oil in the plug holes or something to help get a good idea of the condition of the apex seals. I also don't want to do something that might make the compression test out higher than it really is.
Suggestions?
Thanks
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#8
My old motor was toast (not 1 apex seal left in the rear rotor), it would still start and idle @ 1700rpm if you pull started it. Ran pretty rough and back fired lots, but you could drive it around on just the front rotor if you really wanted to.
#10
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Originally Posted by dr0x
Warm the engine up before you do the compression test. A cold motor wont achieve as high of compression #s.
Curious, whyd you hear it crank but not run? Or am I just assuming that you didnt hear it run?
Curious, whyd you hear it crank but not run? Or am I just assuming that you didnt hear it run?
https://www.rx7club.com/showpost.php?p=5358610&postcount=125
Cold comp. test reads higher according to RotaryResurrection. Warm test gives a more "true" compression reading.
Last edited by Juiceh; 04-22-06 at 12:49 PM.
#13
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anything under 85 its about time to start looking for a rebuild, a very well mainted fc that wasnt abused (i dont mean it was never driven i mean ABUSED) should be in the 100-95 range.
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