A7RXY Comp test

A7RXY · Post by **A7RXY** » Sat May 02, 2015 3:28 pm

I meet up today with Tool and Kevin this morning to see if we could get Kevins Elford running for him. I'll let Kevin tell how that all went, but just to start it off as Tool said he would and did get it running.

While there I got Tool to give my car a comp test the result was:

Front 8.5 8.8 8.6 at 235 RPM
Rear 8.2 8.3 8.6 at 236 RPM

So now I'm a very happy bunny .............

PS Tool was good enough to leave Kevin's wheels on his car ........

Dibs

TOOL · Post by **TOOL** » Sat May 02, 2015 7:22 pm

Seeing as you're sharing. Your numbers are:

128, 132, 129 psi @ 250rpm front
124, 125, 129 psi @ 250rpm rear

These are good numbers.

Good to meet you. Enjoy putting the diff in (never again lol).

economiser · Post by **economiser** » Sat May 02, 2015 7:34 pm

TOOL wrote:128, 132, 129 psi @ 250rpm front, 124, 125, 129 psi @ 250rpm rear. These are good numbers.

That surprises me. A new ZZ4 crate 5.7L V8 from GM is over 200 psi cranking compression, for comparison. 130 is cause for a re-ring, or a cam swap, if the ring seal is known good.

mc turbo · Post by **mc turbo** » Sat May 02, 2015 8:37 pm

A7RXY wrote:I meet up today with Tool and Kevin this morning to see if we could get Kevins Elford running for him. I'll let Kevin tell how that all went, but just to start it off as Tool said he would and did get it running.

While there I got Tool to give my car a comp test the result was:

Front 8.5 8.8 8.6 at 235 RPM
Rear 8.2 8.3 8.6 at 236 RPM

So now I'm a very happy bunny .............

PS Tool was good enough to leave Kevin's wheels on his car ........

Dibs

that's excellent results m8 has it had a rebuild recently?

ps, & how was kevins fb?

mc turbo · Post by **mc turbo** » Sat May 02, 2015 8:49 pm

economiser wrote:
TOOL wrote:128, 132, 129 psi @ 250rpm front, 124, 125, 129 psi @ 250rpm rear. These are good numbers.
That surprises me. A new ZZ4 crate 5.7L V8 from GM is over 200 psi cranking compression, for comparison. 130 is cause for a re-ring, or a cam swap, if the ring seal is known good.

mazda list the 12a as having 9.4 bar = 136 psi from new!

Lucky · Post by **Lucky** » Sat May 02, 2015 8:50 pm

Great numbers. Anything in the high eights is compression to be proud of

myatt1972 · Post by **myatt1972** » Sat May 02, 2015 9:30 pm

Nice figures, now get some miles done and get them down

A7RXY · Post by **A7RXY** » Sat May 02, 2015 9:39 pm

myatt1972 wrote:Nice figures, now get some miles done and get them down

Its now got 36,155 on it I might have to put it away for the summer ..................... As I've now worn the paint out on one of the wings I don't want to wear the engine out as well............

economiser · Post by **economiser** » Sat May 02, 2015 11:25 pm

mc turbo wrote:
economiser wrote:
TOOL wrote:128, 132, 129 psi @ 250rpm front, 124, 125, 129 psi @ 250rpm rear. These are good numbers.
That surprises me. A new ZZ4 crate 5.7L V8 from GM is over 200 psi cranking compression, for comparison. 130 is cause for a re-ring, or a cam swap, if the ring seal is known good.
mazda list the 12a as having 9.4 bar = 136 psi from new!

So, aside from the need for better apex seals, the thing wants boost? ( turbo )

ian65 · Post by **ian65** » Sun May 03, 2015 7:39 am

Great numbers Dibs, almost as good as new.
Although the mileage is low these are still old cars so it's nice to have your engines health confirmed and that's only way to do it...i bet you're well pleased

www.RX7fb.com

A7RXY Comp test

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