SwiftTone

I'm interested in buying a 10AE. The owner of the car(member on this board) let me do a compression test on it. According to RotaryRessurection's tech article on how to do a compression test, you're suppose to insert the compression testing on the lower plugs. We didnt do that. We inserted the compression tester into where the top plugs are supposed to go.

The results for the front rotor were 90-90-90 if we held the vent valve down. And 110 if we cranked it for 5 seconds. Same results for the rear rotor.

My question is, are the results going to be different if I did the same thing but used to lower plugs. Thanks

~Dave

RXciting

I think i remember trying it on both leading and trailing spark plus holes, with the same results for both.

SwiftTone

Are those compression numbers good?

FC_DRIFTER

Yep

Stanello

iTrader: (1)

Yes, those numbers are fine.

Funkspectrum

iTrader: (5)

between 90 and 110 is good....

SwiftTone

Sweet, cause the motor(original) has 76k miles on it. How many miles could the motor last if its treated the same it has been. Just out of curiousity. I know this is not a realistic question. But I'd like an estimate.

Also, what does the 90-90-90 mean when I head the valve down and cranked it.

Thanks
~Dave

felixwankel88

115+ is like new, 100-115 is healthy, 90-100 is getting weak(1 year or less in most cases) below 90 could blow at any moment.

from rotaryresurrection.com

felixwankel88

but from past expecence a engine will prob run good till about 80 psi compression

Stanello

iTrader: (1)

It means that each rotor face, (3), made 90psi.

CompuBob

ok

110psi in top holes is FANTASTIC numbers.

I'd say anything above 90psi is good, 80-90 fair, below 80 is almost gone.

emopunk96

Do you have a link to this compression test? Also how does this test differ on ported engines?

bigdv519

iTrader: (3)

Another reason why I don't advocate what other people might or might not have experienced. My 90 vert had 74psi in all 6 chambers and still runs, and starts on the first try everytime, with a handfull of mods, and redlined daily.

Been that way for 3 years now, and still going.

SwiftTone

Whats the difference using the top holes and bottom holes? There must be a difference if RotaryResurection specifies to use the bottom holes, right?

felixwankel88

i think there could a possible diffrence of a few lbs, if u really wanna get the max compresision take 1 pug outta both housings and put a cranking amp charger on the battrery, then see what it says.. p.s your in mass toooo, ill have to check it out sometime, how much u paying for it it want a 10ae!!!! haha

ddub

Top or bottom plug hole, doesn't matter. I've done both, always got same results.

emopunk96

again, does a ported engine make a difference on compression numbers?