Compression test done.. numbers REALLY high??
12-04-06, 03:49 PM
#28
Originally Posted by fusion-turbo
Count 
I guess you can do math? 250RPM is what it says in the FSM, so 250 revolutions equates 250 RPM at the ROTORS right? If so, there should be 750 puffs. Divide that by 60 (seconds in a minute) and 750/60=12.5. So you should see 12.5 puffs a second if the motor is rotating @ 250RPM. Hmm, that seems like alot.... this is of course, theory... HAH
I guess you can do math? 250RPM is what it says in the FSM, so 250 revolutions equates 250 RPM at the ROTORS right? If so, there should be 750 puffs. Divide that by 60 (seconds in a minute) and 750/60=12.5. So you should see 12.5 puffs a second if the motor is rotating @ 250RPM. Hmm, that seems like alot.... this is of course, theory... HAH
12-04-06, 04:27 PM
#33
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Originally Posted by classicauto
ooooor you hook it up to a Mazda compression tester (a bunch of members did this on an Ottawa Cruise) or hook up digital tach or timing light with RPM reading while doing the test....................
Counting was still fun without the mazda tester tho
12-04-06, 07:55 PM
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Originally Posted by slpin
oh, when i find one, i know i will
it will be too tempting
how do i stop myself from looking at turbo upgrades?
it will be too tempting
how do i stop myself from looking at turbo upgrades?
12-04-06, 08:35 PM
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Originally Posted by fusion-turbo
Bought an Autozone compression tester.. pulled out the valve on the dial so it wouldnt hold a reading.. warmed the motor to normal Op temp and tested my compression. Pulled the EGI fuse, held the throttle wide open and cranked the motor.
I saw about 115 psi rear rotor and about 118-120 front! The motor is a j-spec used motor with about 60k miles on it... now i hear most people saying they have about in the 90's to low 100's.
What gives? Is this normal compression?
I saw about 115 psi rear rotor and about 118-120 front! The motor is a j-spec used motor with about 60k miles on it... now i hear most people saying they have about in the 90's to low 100's.
What gives? Is this normal compression?
Dude i have a jspec and my mechanic did a compression test the other week it is supposed to be between 100 and 120 on the turbo, shame my rear rotor was at 15psi lol
12-04-06, 11:33 PM
#37
Originally Posted by fusion-turbo
Count I guess you can do math? 250RPM is what it says in the FSM, so 250 revolutions equates 250 RPM at the ROTORS right? If so, there should be 750 puffs. Divide that by 60 (seconds in a minute) and 750/60=12.5. So you should see 12.5 puffs a second if the motor is rotating @ 250RPM. Hmm, that seems like alot.... this is of course, theory... HAH
I guess you can do math? 250RPM is what it says in the FSM, so 250 revolutions equates 250 RPM at the ROTORS right? If so, there should be 750 puffs. Divide that by 60 (seconds in a minute) and 750/60=12.5. So you should see 12.5 puffs a second if the motor is rotating @ 250RPM. Hmm, that seems like alot.... this is of course, theory... HAHyou turn the ecc shaft 1/2 revolution and you get compression from one rotor face on one rotor another half turn you get compression from the next rotor on its face, and so on and so forth.
the rotors spin at 1/3 the speed the ecc shaft does.
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