Compression test today
10-12-2013, 12:29 PM
#1
Compression test today
So I've had my 04 MT 8 for about a year and a half and just got a compression test. I know, should have done that a long time ago. Flame on. The tech who preformed the test said it came back with good compression on both rotors. Being of a suspicions nature I figured I should confirm his assertion here and true to form there are several threads of results and how to interpret them. When I bought the car it has 85,000 miles on it and its now at 94,000.
Results:
1 8.3 8.2
2 8.2 8.2
3 8.3 8.3
RPM 243 247
While I was there I did get a printout of the warranty work and I found out the
previous owner replaced the engine and cat in Nov-06 at 29,000 miles. Which was good to know.
Results:
1 8.3 8.2
2 8.2 8.2
3 8.3 8.3
RPM 243 247
While I was there I did get a printout of the warranty work and I found out the
previous owner replaced the engine and cat in Nov-06 at 29,000 miles. Which was good to know.
10-12-2013, 02:50 PM
#5
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RX-8. I used the Foxed CA calculator, Renesis option. There are a few points on it that make me wonder a bit, like the normalization is actually apparently normalizing to 260rpm not 250.
The RX-7 service manual compression chart has failing at 5.9
The RX-8 service manual compression chart has failing at 6.9
Edited for incorrect information
The RX-7 service manual compression chart has failing at 5.9
The RX-8 service manual compression chart has failing at 6.9
Edited for incorrect information
Last edited by RIWWP; 03-26-2014 at 04:49 PM. Reason: Edited for incorrect information
10-12-2013, 03:01 PM
#6
Where did they get 5.9 for s1 from then?
COMPRESSION INSPECTION
I was like hmm, no way! Cuz as far as I remember 5.9 is for rx7
COMPRESSION INSPECTION
I was like hmm, no way! Cuz as far as I remember 5.9 is for rx7
Last edited by nycgps; 10-12-2013 at 03:03 PM.
10-12-2013, 03:14 PM
#7
The one u show came from rx7 manual, someone probably mistaken and upload the wrong stuff.
Does the one u post said to do the test from the trailing plugs and floor the pedal to do the test? If it is then yes it's from rx7
When u dl the PDF for 2004 rx8, it shows the same thing I sent you. Which makes more sense since msp does have higher compression rotor in the first place
Does the one u post said to do the test from the trailing plugs and floor the pedal to do the test? If it is then yes it's from rx7
When u dl the PDF for 2004 rx8, it shows the same thing I sent you. Which makes more sense since msp does have higher compression rotor in the first place
Last edited by nycgps; 10-12-2013 at 03:26 PM.
10-12-2013, 03:21 PM
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Understood. That is the first reasonable explanation for the various charts floating around that I've seen. Makes a lot of sense.
Might have to do a bunch of adjustment and chart cleanup it looks like. Until now, I would have sworn that I had seen the 5.9 chart in the OEM documentation, but I've been hunting since your previous post and haven't found it.
Might have to do a bunch of adjustment and chart cleanup it looks like. Until now, I would have sworn that I had seen the 5.9 chart in the OEM documentation, but I've been hunting since your previous post and haven't found it.
10-12-2013, 03:35 PM
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Alright, thanks. I've been thinking I need to overhaul the new owner's thread anyway to get some sections updated that will need a complete re-write. Probably time for it, and can dig back through past posts for where I've used that chart.
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