2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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Engine opinions. <- Many opinions wanted!!!!

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Old 10-21-03, 03:33 PM
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what are good compression numbers in psi? i think that is the right term.

congrats n4ji. let us know what she feels like.
Old 10-21-03, 03:34 PM
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YEAH BABY!!!
Old 10-21-03, 03:37 PM
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A great rotary should have about 100psi on each rotor, anything less then 80 is in need of a rebuild.
Old 10-21-03, 04:57 PM
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nah still doesnt run.. its a mystery

took it to a mazda dealer because i was stumped.. theyve had it for 2 weeks and cant find anything wrong yet
Old 10-21-03, 05:43 PM
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where can i get a compression tester? and how much do they run for?
Old 10-21-03, 10:10 PM
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Compression testers are relatively expensive I believe. Just take it to a car dealer (preferably Mazda) and they can run a test for around $70.
Old 10-21-03, 10:40 PM
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nah dude compression testers are like 20 bucks around hurr =/
Old 10-21-03, 10:42 PM
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Blasphemy! I was talking to a guy at Tom Wood Mazda (right down the street) and he said they cost $74! I hope you get your TII running again, it was a fun car to drive when I went and saw it over the summer.
Old 10-21-03, 10:46 PM
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lol well the tester i got was that cheap, it sucks but it works.


yeah it was fun to drive for the one day i was able to drive it!

thanks though.. im gonna call the dealer and figure out wtf is going on
Old 10-21-03, 10:54 PM
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Originally posted by cloead
nah dude compression testers are like 20 bucks around hurr =/
you must be thinking of standard pressure gauge testers. The mazda tester is a proprietary tester for rotary engines and definatly cost more than $20
Old 10-21-03, 11:29 PM
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Originally posted by n4ji
When he gave me the compression results, he gave me numbers like 8.5 8.3 8.7 with a low of like 7.9. He said Mazda checked it all out and it said it was in perfect condition. Maybe he was telling me the boost being run? Any ideas there?
Hmm, you would think that maybe Mazda would write down compression test procedures and standards somewhere, like in a service manual or something like that. Oh well, since nothing like that exists, I will guess that those numbers were probably the deflections of your fan belts in mm, which means that they are a bit tight, but the AC compressor belt is fine if it was the one with the 7.9 reading.

Originally posted by hpram99
you must be thinking of standard pressure gauge testers. The mazda tester is a proprietary tester for rotary engines and definatly cost more than $20
About $1,600 new.
Old 10-22-03, 05:02 PM
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yeah.. the mazda tester...

wow 1600 half the price of my car!
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