rx8 compression question
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MincVinyl (05-02-2023)
05-02-2023, 07:20 PM
#3
Registered
I can confirm 60psi would cause hot start issues, and stalling at hot idle.
Are you sure you fully hand tightened the pressure transducer? Which order did you do your test in Front or Rear first? Was the engine at running temp during both tests, or did you take over 10mins to do the test?
Are you sure you fully hand tightened the pressure transducer? Which order did you do your test in Front or Rear first? Was the engine at running temp during both tests, or did you take over 10mins to do the test?
05-03-2023, 09:53 AM
#5
Registered
If one rotor was low enough to not make enough compression, I imagine the idle would get extremely lumpy. Which is hard to tell in your short vid, not sure what exhaust you have or what it normally sounds like. Might want to do a repeat test when just to be sure. Again try to do everything you can prepping while the car is running. Shut it off and do the test as soon as possible. The closer you are to running temp, the better the reading.
How many miles are on it?
How many miles are on it?
05-03-2023, 05:50 PM
#6
40th anniversary Edition
RX8 engine compression test chart
RX8 engine compression test results chart. Sorry for the poor quality. Cheers
Last edited by gwilliams6; 05-03-2023 at 06:19 PM. Reason: poor quality
05-03-2023, 06:29 PM
#7
40th anniversary Edition
What rpm did you do the compression test at? Look at the chart, 60's is failing at any rpm. 80-90's aren't good except if your test was at very low rpm . Your test numbers need to be normalized to 250rpm at sea level. And that is too much a gap between numbers from one rotor to another to run properly or even to start well.
Test again under controlled conditions, but it might be time for a rebuild .
Cheers and best to you.
Test again under controlled conditions, but it might be time for a rebuild .
Cheers and best to you.
Last edited by gwilliams6; 05-03-2023 at 06:36 PM.
05-03-2023, 07:55 PM
#8
What rpm did you do the compression test at? Look at the chart, 60's is failing at any rpm. 80-90's aren't good except if your test was at very low rpm . Your test numbers need to be normalized to 250rpm at sea level. And that is too much a gap between numbers from one rotor to another to run properly or even to start well.
Test again under controlled conditions, but it might be time for a rebuild .
Cheers and best to you.
Test again under controlled conditions, but it might be time for a rebuild .
Cheers and best to you.
05-04-2023, 10:00 PM
#9
40th anniversary Edition
Today i did another test and this time i tried both leading and trailing. Front rotor was still 62/64/72 psi. Tested 3 times each and that was the average. Rear rotor was actually 89/91/94 psi. Car was fully warmed up oil was at 175 degrees F and coolant was 180.
Still not sure how i have 0 misfires, no smoking, and 0 starting issues. Must be lucky. Anyways time for the rebuild
Still not sure how i have 0 misfires, no smoking, and 0 starting issues. Must be lucky. Anyways time for the rebuild
Yes I think time for a rebuild.
As you know, the RX8Ckub has a list, somewhat updated, on reputable Renesis engine rebuilders across the country. Unless you are skilled on rebuilding Renesis engines, leave it to the pros.
Cheers and best to you. Keep us informed ok.
01-11-2024, 10:11 AM
#11
You gonna eat that?
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