never done a compression check, dont know the first thing besides u use the spark plug hole. go to an autoparts store and buy one? hw much? does the engine need to be running, or could i just turn the flywheel(my tranny is off to change the clutch)? i have a wierd feeling that i have bad compression and wanna know without having to take it to a dealer. any info will be appreciated, thanks.

 

To check compression on rotaries you need special equipment. You can do a crude version with a normal compression tester, but it's more to see if the seals are totally dead.

Just go to Mazda and fork over for the proper test.

 

Check out the following for a non running engine:
https://www.rx7club.com/forum/showth...hreadid=107564
You can get a compression gauge for 20/30 bucks from discount auto store and test after engine running. Normal compression test, engine should be warm, pedal floored, button on gauge removed or held in to get the compression on each chamber. You're looking for 3 even responses from each rotor
Do a search for more info.

 

thanks

 

could flooding my engine result in a loss of compression? i know when it was flooded i didnt know what was wrong and a mechanic told me it had no compression but that was cause there was no oil to seal it. i am just worried that i need a new engine.

 

Yes, it can cause loss of cpmression. Before you go to start it you can put a very little oil, atf or the like in the rotor housings to build compression. There are many threads dealing with flooding/low compression. I'm in work and have pc problems, so I can't direct you to the link for flooding info. If no responses, I'll post tonight.

 

i ment a perminat loss of compression, like screwing up the apex seals?

 

anyone?

 

No oil can damage the apex seals, and the seals may also start to gouge the rotor housing.

Throw in some oil through the plug holes. That keeps you covered when you go to start your 7. Once the motor begins to spin the OMP will start sending oil into the chambers. It's just when you go to get the motor spinning that you should worry about lubrication...

 

My compression tester (25$ canadian) works just fine and is dead accurate with mazda's specs. Its not 'crude'. Some guys have said mazda wanted upto 100$US for a compression test, I say **** that.