Well I finally got around to doing a compression test on my 87 Turbo II. I bought the car late last summer and put it away for the winter after driving it less than 100 miles.

This was my first time performing a compression test (rotary or otherwise) and I did it using the digital RCT-V5 from rotarycompressiontester.com. This is a great tool! Very easy to use and worth the money.

So here are my numbers:

Front rotor: 94, 94, 88
Rear rotor: 103, 91, 99

So what do you guys think? Anything to worry about? They are not perfect numbers but I didn't think they were too bad for an 87' with 139,000 miles!

 

Mine wasn't perfect also and it runs fine.

I went to multiple track events, race tracks not autox and check my compression
Front : 86, 81, 86
Rear: 86, 81, 82

And went to another 3 more events and mine still runs fine.
Mine is N/A w/ mild street port

 

be more concerned about the 3 piece seals if it's original than the numbers alone.

 

the all faces on the front rotor are within 6psi, and the rear is within 4 psi, which is good. since there is no cranking rpm, the absolute number can't really be judged

 

The tester normalizes results to 250RPM so all good there!

 

Yea I unfortunately won't know until I open it up sometime. Aside from area around the the oil filter the rest of the block is pretty clean which makes me think it was rebuilt at some point but I'm not sure.

 

With 139,000 miles those are good numbers, have similar numbers on a 90 rebuilt five years ago with 60,000 miles on it with classic seals, still fires right up, you good to go bud.