Yea, I need to compression test my Rx-7...
Someone with an actually rotary tester. Thanks.

 

Well there's 2 that i know of in the oshawa area.

 

You won't find an Official rotary tester unless you are very lucky.
Heck, most Mazda dealers don't have them... lol

 

just use a regular compression tester with the valve core removed out of it.

 

or you could just hold the pressure release button down

 

the pressure release button doesn't respond quick enough on some

 

84 Stock is right, the accurate way is with a factory compression tester, which we happen to have!

 

yeah it depends on what you are testing. you don't need to remove the valve if you have a broken apex seal

for more accurate readings, such as compression build up during break it, you want to use the factory one if possible, or get something that will react quickly to each pulse...

 

i just wanna check the apex seals...
i'd do it manually like pulling one of the sparks out then cranking it to hear the "psst" sounds but i'm too inexperienced to try that..

maybe i'll just get a regular compression tester and try it. What readings should i be getting for the 3 pulses? Someone told me that above 100 is good and about 90 is dying... true?

 

There is variation among testers, but generally around 85 psi (on all faces)is the lowest you want to see. If you see more then 85 then your apex seals are all present and doing their job.

A fresh, healthy engine should get above 100 psi. These numbers are influenced by cranking speed, and atmospheric pressure. Other things like warm/cold engine, porting will influence it too.

If you just want to know whether your engine is on its way out or not, a non-mazda tester is fine.

 

There ya go, Yellow. Get your butt up to Scarborough Mazda.

 

ah i'm confused.. so 01racing works at scarborough mazda?? cooooool...
too bad i have to TOW it there cuz my freaking clutch is dead.. i was hoping it was portable or something. lol.
i need to see if the motor is worth the clutch job, that's why.

 

It's highly portable. And damn expensive. Maybe you can put a deposit on it or leave a credit card with them or something while you borrow it...

 

I have ians credit card you could hold on to it while i borrow your car.

 

You'll have to give me something more valuable than that - like half a spark plug or some broken lightbulbs.

 

rofl!

 

lol ok kids, settle down.