Does overlap affect compression test results?
02-13-04, 09:43 PM
#1
Hey, where did my $$$ go?
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Does overlap affect compression test results?
Hey guys, I was wondering how bad overlap messes with a compression reading? I saw on another post that Mazda min compression suggestion is 85psi which is just a hair less than what mine is however my car dynoed well and ran awesome.
Could it be do to porting that has significat overlap? Would that cause the compression to read low? I'm thinking it would
STEPHEN
Could it be do to porting that has significat overlap? Would that cause the compression to read low? I'm thinking it would
STEPHEN
02-18-04, 07:19 PM
#6
Lives on the Forum
If it's like the Mazda tester...
Anything over 100psi is great.
Anything from 80psi to 100psi is good.
Below 80psi is looking at a rebuild soon.
Below 60psi (Mazda spec) is a bad motor.
-Ted
Anything over 100psi is great.
Anything from 80psi to 100psi is good.
Below 80psi is looking at a rebuild soon.
Below 60psi (Mazda spec) is a bad motor.
-Ted
02-20-04, 10:46 AM
#7
built my own engine
the port job does not affect compression
you should be looking for 130psi on new rotor housings, 115-125psi on used rotor housings
if the number is lower but above 90psi, you are still breaking in your apexseal/rotorhousing wear
you should be looking for 130psi on new rotor housings, 115-125psi on used rotor housings
if the number is lower but above 90psi, you are still breaking in your apexseal/rotorhousing wear
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