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Simon
rice boy
Joined: 16 Feb 2002
Posts: 47
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 Posted: Tue May 14, 2002 7:27 pm Post subject: Engine and Compression Q |
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Hey there..if anyone can help it would be so greatly appreciated..i had my motor worked on the other day...i fou8nd out that 3 of the cylinders have 110 compression while the fourth has 125...can anyone explain what this means...and how to fix the problem (what may be casuing it?)
Thanx heaps...Simon |
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RJM
tinkerer
Joined: 10 Oct 2001
Posts: 109
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| Posted: Tue May 14, 2002 10:57 pm Post subject: Re: Engine and Compression Q |
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Either worn / broken rings or faulty valves / valve seats.
Next time you do a compression test try pouring a small amount of clean engine oil in each cylinder and if the compression increases then its the rings (or even the bores) if not then the valves aren't sealing properly. |
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Josh
backyard mechanic
Joined: 04 Oct 2001
Posts: 602
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| Posted: Tue May 14, 2002 11:31 pm Post subject: Re: Engine and Compression Q |
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| Thanks pretty shit compression, my new engine after running for 20 mins got all 4 cylenders at 155psi |
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alan
tinkerer
Joined: 07 Apr 2002
Posts: 429
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| Posted: Wed May 15, 2002 1:08 am Post subject: Re: Engine and Compression Q |
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The minumum spec compression for a gem is 125 psi (860 kpa). Once you are at that level, its time for a reco. New rings usually produce approx 160 - 170 psi.
Run the engine at operating temp, and take off the oil filler plug. Is there blow by(smoke) coming out?
No - you need a re ring.
Yes - you need a rebore. |
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