Hey Guys,

Well, John had his official Mazda Digital Rotary Compression Tester at the Ottawa meet, let's hear how you all did.

Engine: '84 12a
Condition: Stock 185,000km
Front Rotor: 7.2, 7.2, 7.2 @ 300rpm
Rear Rotor: 6.8, 6.9, 6.8 @ 285rpm

Diagnosis: Borderline. Expected result from a stock engine with that many kilometres. Landed right on the "minimum compression" line on that graph on the back of the tester. As long as it's lubricated it'll last me until I rebuild it.

Jon

 

BTW, the tester is not mine.
It was loaned to us by Ted, one of the racers Nik and I are helping prepare their GTS series race FD.

So all the props to him.

We are all glad such a cool item could be put to good use.

 

Ottawa once again a great meet rain or shine. At least on the saturday that I was there.

I knew I should have stayed in bed. I blame Chooks for showing up at the KW meet point. Next thing you know I'm in Ottawa! LOL. I've found some way to get to Ottawa every year for the past 5 years now.

Thanks Will and Stace for hospitality time and time again.

And BTW, I set the cruise on at 120Km/hr and drove the FD home 570KM and it is just touching the E on the fuel gage. Yes that is 600KM per tank on the FD! Woohoo.

 

Front: 4, 3.5, 8.6
Rear: 17, 91, 2

Still pulled a 300C on the QEW last night.

 

Sounds like you had a good time. Wish I coulda been there.

 

WTF? Those numbers are forkin' weird. 91kg/cm2? Crap that's so much compression it'll turn the carbon in your engine into diamonds

Jon

 

Feds designs charcoal canisters for KIAs. 'nuff said.




[edit] Lookie what I found. Now who was driving a green FB?

 

so fed has a worn engine, and he pulls on cayannes?(sp?)

 

Feds pulls on FD's with 7 lbs of boost.

Compression numers are for pretenders. That GTech said 6.5 to 60, and I'm more than happy with that.

 

Denial, step 1!

 

I'm just happy someone beat my low score

Jon

 

step 2:

Build a bridge for when this motor wears out

 

i don't remember mine exactly...must be the exhaust fumes.

mine were all between low 8s and 9s. Rich, you got a picture of mine?

 

yep!@ compression numbers are for posers. My old engine had 12PSI on 1 rotor and 30PSI on the other rotor, aside from being a bitch to start it wasn't down any power.. probably still made 250hp. yay for turbochargers.

 

-Nik's well broken-in Half Bridge engine was 7.5 or so on both rotors.

-Brianna's car with the j-spec of unknown origin and mileage, was pulling 10's and 9's. Although, the difference between chambers was not ideal.

 

in theory, if all seals remain intact and no major damage is incurred to the internals, compression will actually INCREASE slightly due to carbon build-up. a lot of piston-bangers actually experience knocking since the increase comp can be significant enough to cause that. don't know if that ever happens with rotaxes...

 

Unless it's in the vid, nope.

 

Just tested my GSL-SE. 128121 miles (204 993 km) original engine.

Front Rotor: 9.4-9.4-9.5 @ 215 rpm
Rear Rotor: 9.8-9.8-9.9 @ 218 rpm

Minimun at those cranking speeds is 5.3.

 

nice numbers...so, this all proves that we should all leave the engine building to Mazda

 

Nice numbers. I've seen some cars with half that KM pull half those numbers. LOL

 

I think it proves that NA engines, as long as they are treated well, take a long long time to wear out...

 

Yo, those are pimping numbers ......

 

when you drive like grandma, you get numbers like that!!

 

Haha...you a funny man, L'eaquhizatae

 

I wonder what Kneeho and IAN's numbers will be ... hmm...

Must be shooting 15's !