My R1's compression test results
#1
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My R1's compression test results
Using my newly bought mazda rotary digital compression tester, just checked my R1's engine health:
front rotor: 6.0/5.7/6.3
rear rotor: 5.7/5.8/5.9
The motor has about 9k on my build with mazda 2mm 2 piece apex seals. The rotor housings have about 50k miles on them.
Up next is my dad's FD, then my vert
front rotor: 6.0/5.7/6.3
rear rotor: 5.7/5.8/5.9
The motor has about 9k on my build with mazda 2mm 2 piece apex seals. The rotor housings have about 50k miles on them.
Up next is my dad's FD, then my vert
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#12
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Car hot starts great and runs like a champ--great throttle response and low rpm pull. There is an excessive amount of overlap (very aggressive port), which contributes to a vacuum reading of only 10-12 inches. I'm not worried about it
#15
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Originally Posted by alexdimen
so porting can have an effect on compression because of the overlap?
my stock port core pulls about those numbers... you had me worried for you
my stock port core pulls about those numbers... you had me worried for you
#17
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Originally Posted by RCCAZ 1
Maybe it's because of the high mileage on his housings? Not sure.
It's about 14.3 psi per kg/cm^2, right? That makes his numbers
front rotor: 6.0/5.7/6.3 = 86,82,90
rear rotor: 5.7/5.8/5.9 = 82,83,84
Average of 6 (86) front rotor and 5.8 (83) rear rotor. Seems a little low, but not that low. Mid 8's (8.5) would be about 122psi. That would be a pretty damn healthy engine from the numbers I've read.
#20
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Originally Posted by alexdimen
so porting can have an effect on compression because of the overlap?
Run her till she blows I guess
Last edited by afterburn27; 03-22-06 at 05:26 PM.
#23
hey rich, i've got some good ones with about 2500 miles on them i'll sell you. $25,000.00 takes them, the only thing is the come with a whole car. it's a good deal man.
#24
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Originally Posted by herblenny
What the hell is cermet?? I am I missing something new that suppose to help rotor housings
#25
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Originally Posted by KaiFD3S
those are preety low #'s, should'nt it be above 7.0 for a healthy engine...
The readings should not be a difference of 1.0 kg/? on each of the 3 sides.
On most mazda compression testers, there is a conversion chart on the back or some have it in the front. Mine has it on the back that will tell you what the compression is compared to the cranking speed.
Goodfellas, what was the cranking speed?
Did you use the conversion table?
If you don't mind me asking, how much was your unit?
What you tested the 1st rotor, were the plugs in our out of the 2nd rotor?
Was the car warmed up when you tested?
All of these affect the readings...
After using this tester on a number of motors and friends motors, I really do not like it at all. I think they are quirky at best. You have to stop cranking at the right cycle in order to get accurate readings and we have tested numerous times and get different readings.
I think if you are testing for a blown engine, they are great but you can do that with a piston engine one or just listen for the pulses.
Anthony