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Discussion Starter · #1 ·
These are the compression check #s for a Supra I found for sale.. Considering buying it, if yall think these are decent #s.

#1=167, #2=167, #3=169, #4=157, #5=168, #6=165

They all seem to be good, but should I be worried about the variance in the #4? Thanks for any info :)

Thanks.
Chris
 

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# 4 is low.. the rest are good.. I cant remember the variance that toyota specifies is the maximum, but I think it was 15 %...
 

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Search. I suspect that #4 is too far out of spec. Do a leak-down test to locate the source of the problem.
 

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Looks good to me. No more than 14 psi variance according to the book. Your numbers are similar to mine with 7K on the engine.
 

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Discussion Starter · #5 ·
quick said:
Search. I suspect that #4 is too far out of spec. Do a leak-down test to locate the source of the problem.
Yeah, I did a search, didnt really find anything except for other people's results, and Toyota says as long as its above 125 or something like that, then its considered good, and as long as there isnt more than a 10% variance (between the highest and lowest cylinder is less than a 10% variance.. 169-157 is appx. a 7% variance).... Leakdown test is a good idea though, thanks very much for the suggestion, Ill ask the seller if he would be willing to do that. :)
 

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Jaxx said:
don't those numbers seem a little high?

book says 155+ is normal; 128 is minimum; 14 difference is max difference
 

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these compression numbers are fine man....dont u worry...they are in the 160s because of the carbon build up inside the combustion chamber over the time...the compression num the car must have when new is 155.....it is normal to have figures in the 160s over time.....
 
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