I just wanted to confirm that these numbers look good:

Rotor 1 (220rpm)

6.9
6.9
6.5

Rotor 2 (221rpm)

6.8
7.0
6.6

Thanks!

 

Good is subjective. They are passable.
There is a link in the new owners sticky to a chart & calculator for RPM, sea level, etc.
Check it out.

 

No bueno. Passing on the chart (barely) and failing per the android app. Either way very shitty for 8k.

 

I need to re-do that chart. the failing libe is set for an rx-7, and is too low

Posted From RX8Club.com Android App

 

Not terrible, but not good for that low mileage. Here are your normalized numbers based on the rotary compression calculator. You can do it yourself here Foxed.ca - Rotary Compression Calculator . Also not sure where your located but you may have to normalize for sea level.

Here are the normalized numbers:

Rotor 1:
7.6
7.6
7.1

Rotor 2:
7.49
7.71
7.27

Overall mediocre results. I would expect to see 8's and 9's for that low mileage.

 

Well.. I bought it before I saw a lot of these posts... hope I didnt make a huge mistake. Only plan on doing about 8k miles a year. Hope it can last ne 3-5...

 

"I hope" is a terrible way to begin a rotary ownership.

Sorry, but it's true. Rotaries don't last long on hope, and tend to go for the nuts when hope is what it's running on.

 

a "rebuilt" is very subjective.

- disassembled, clean all parts, re-assemble it with new o-rings and gaskets.
- disassembled, clean all parts, new rotor housing, re-assemble with new o-rings and gaskets.
- blah blah, new apex seal only, re-assemble blah blah blah

all of the above can be considered as a "rebuilt", so it really depends on what was "replaced" during the "rebuilt", you will get a very different engine.

a "8" compression engine is really new, I rarely see a "9+" rx8 engine even when it's new or after the "break in", most will just stay around high 8's and will stay that way until things starts wearing out.

your engine is not bad, u should premix if you want it to last.

 

Thanks for the advice. I biught it, it's mine, and I'll do whatever I can to keep it running well.

By rebuilt, I meant it was a factory install by mazda 2 years ago. They claim it was new, but I thought I read that they were all reman at that point (still not clear on that).

I love the car. I did my research and knew what I was getting into. I thought those were decent numbers per the faq?

 

Those numbers are sad but you own it now. Where do you live Deacon? According to the Renesis Compression Android app those numbers are out of spec. The one on Foxed is specifically for the RX-7 I thought and not usable due to the different compression ratio.

 

Near Madison, Wisconsin

 

Ah, so not much above sea level right? Your cranking RPM is low, and was this done while the engine was hot? Who did the test?

 

Nope..

 

See my edit.

 

I dont know whether it was done while the the engine was hot. I had it done at a mazda dealership, but I was not on site.

 

I dont think this is true. They added the renesis to the drop down menu when making a selection. I could be mistaken though....

 

OK, I reran those numbers and accounted for my altitude:

7.88 7.88 7.43
7.75 7.95 7.52

Now in the FAQ, that would seem to fall in this range:

- 7.5-7.9: This is a solid engine. Most engines from Mazda seem to be in this range after the break-in period. Stay on top of the other failure points possible, and you should get at least 60-80k more out of this engine, if not more.

 

Your engine is definitely better than my old reman from the get go... Should be fine...

 

Ah so they gave uncorrected numbers? Geesh. Not surprised though.

 

They didnt normalize the number I was given either from the dealer. It seems they arent really doing that for most customers.