compression check on cold engine
#2
Originally Posted by brandon davis
I have a rebuilt 91 NA engine with less then 3k. compression reads with mazda factory tester front rotor 6.9 average and rear 8.7 average. Are these good results for a rebuild with less than 5k on the engine?
#4
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strangest thing.
we had an rx8 in the shop, it came in flooded. we start it, its running on 1 rotor, no power, doesnt rev much past 5000, etc.
compression was good in the front, 9's in the rear it was 5.5 6 9.9
engines bad right? we call mazda, they say to put coils in it. we do, car starts right up runs fine
retest compression
f 9 9 9
r 8.8 9 9.2
somehow the coils fixed the engine.... wouldnt have believed it, if i didnt see it. id say it was the tester too, if the rear was evenly down, but it wasnt...
we had an rx8 in the shop, it came in flooded. we start it, its running on 1 rotor, no power, doesnt rev much past 5000, etc.
compression was good in the front, 9's in the rear it was 5.5 6 9.9
engines bad right? we call mazda, they say to put coils in it. we do, car starts right up runs fine
retest compression
f 9 9 9
r 8.8 9 9.2
somehow the coils fixed the engine.... wouldnt have believed it, if i didnt see it. id say it was the tester too, if the rear was evenly down, but it wasnt...
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Originally Posted by mono4lamar
^ thats really weird! coils have nothing to do with compression... can you call them up and ask how on gods green earth it effects compression and how the hell they knew that?
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