tjim

I need to find compression numbers been looking. can't find them I need the kgf/cm2 ty.

RIWWP

iTrader: (2)

If you are looking for the chart, scroll up to the top of the new member forum and click into the new owner's thread. Or click the link in my signature below this post. It's in post 6 or 7.

tjim

went in there and no numbers. talks about it. talks about the engine. and I know read. read. read,

RIWWP

iTrader: (2)

Bottom of post #7

tjim

well came out at 6.8 6.8 7.1 and 7.4 7.6 7.2. at 235 rpms. your thoughts pls.

9krpmrx8

iTrader: (46)

Healthy engine. Time for a new starter or possibly a battery though, it shoudl be cranking above 250RPM. If you get a new starter make sure it is the updated 2.0KW rated starter.

tjim

on mazda compression sheet it said 6.9 min

9krpmrx8

iTrader: (46)

What Mazda compression sheet? That graph is from the factory service manual.

9krpmrx8

iTrader: (46)

What is the altitude where you live?

http://foxed.ca/index.php?page=rotarycalc

RIWWP

iTrader: (2)

Yes, it's 5.9 minimum. There IS another chart that shows a line at 6.9, but it's not a pass/fail line.

The chart above is from the factory manual, the engine compression test procedure. At the end it has "if fail, replace the engine".

tjim

I see. I took it in to have it tested they gave me a sheet from mazda and it said 8.5 standard
and 6.9 minimum have it in front of me.

9krpmrx8

iTrader: (46)

Where do you live? At sea level I get 102psi per face.

tjim

oh and I live in so cal.

RIWWP

iTrader: (2)

Did they tell you "it fails the test", and then... "here, have a new engine" ?

Here are some of the other charts out there:
Series 2: https://www.rx8club.com/series-i-tec...3/#post2955700


Zoom posted this one in 2005, seems really high:
https://www.rx8club.com/series-i-tec...ou-guys-69288/


Here is a min/average chart:
https://www.rx8club.com/series-i-tec...4/#post4292467

tjim

69000. 05. and no they didn't say here a new engine. but that's why I wanted to check.

tjim

and I see the chart. I wanted to know what # are bad.

RIWWP

iTrader: (2)

Anything below 5.9, when corrected for 250rpm at sea level is officially failing. Anything between 5.9 and high 6s is generally weak, softening. Anything over 7.0 is usually considered good to go.

tjim

bye the last chart its under min.

tjim

I only have 4 months left on the warranty.

RIWWP

iTrader: (2)

That is what I was illustrating, there are several charts, and the context isn't always clear. When your compression is normalized, however, your 6.8s increase to 7.2s, your 7.1 increases to 7.5. You aren't failing even on that chart.

9krpmrx8

iTrader: (46)

Man, those seem high. When my buddy who is a Mazda tech did mine with the OEM tester, the software just lit up green next to each reading and said it was "good". Mine was in the 115psi range the last time we did it with our rotary diagnostics tester.

RIWWP

iTrader: (2)

Agreed, the middle of the three charts is...absurdly high. I can't find it anywhere in the OEM documentation. The only thing I can think of is that the documentation has changed since 2005 and that chart was replaced with the current one.

The series 2 chart is correct for the manual, though I don't really understand why it's so much higher than the series 1 chart. It suggests Mazda is willing to replace series 2 engines more readily.

tjim

ty you both for the little inside. ill let you know what they say. I called mazda to see if they'll replace it.

zoom44

my chart came from a person on the team dealing with the engine failures. the one with the a/b lines came from a Mazda Canada Master Tech

tjim

what one is yours. you' ve seen my numbers. what do you think.