2011 Compression Test Results at 45K Miles
#77
Compression results
Hello, I am new in the forum.
I have nearly decided to buy a 192hp 2008 challenge with the following compression at sea level. The car has 28.000miles.
The numbers are in Kpa:
Front rotor:
245RPM:
840
870
840
Back rotor:
255RPM
790
780
800.
I am really worried about the difference between rotors. Any thoughts?
I have nearly decided to buy a 192hp 2008 challenge with the following compression at sea level. The car has 28.000miles.
The numbers are in Kpa:
Front rotor:
245RPM:
840
870
840
Back rotor:
255RPM
790
780
800.
I am really worried about the difference between rotors. Any thoughts?
#79
Water Foul
Thread Starter
Hello, I am new in the forum.
I have nearly decided to buy a 192hp 2008 challenge with the following compression at sea level. The car has 28.000miles.
The numbers are in Kpa:
Front rotor:
245RPM:
840
870
840
Back rotor:
255RPM
790
780
800.
I am really worried about the difference between rotors. Any thoughts?
I have nearly decided to buy a 192hp 2008 challenge with the following compression at sea level. The car has 28.000miles.
The numbers are in Kpa:
Front rotor:
245RPM:
840
870
840
Back rotor:
255RPM
790
780
800.
I am really worried about the difference between rotors. Any thoughts?
You scored a rare good one at a great price. Congrats!
#80
I have read the passing limit is 1.0 (100kpa). I am at 0.9 after normalizing the results.
Is it possible that the back rotor will deteriorate so much against the front one, so that it will cause an issue? Again thank you for your time.
#81
Smoking turbo yay
#82
Water Foul
Thread Starter
Thanks for the answer. Is it something I should worry about though?
I have read the passing limit is 1.0 (100kpa). I am at 0.9 after normalizing the results.
Is it possible that the back rotor will deteriorate so much against the front one, so that it will cause an issue? Again thank you for your time.
I have read the passing limit is 1.0 (100kpa). I am at 0.9 after normalizing the results.
Is it possible that the back rotor will deteriorate so much against the front one, so that it will cause an issue? Again thank you for your time.
#83
Water Foul
Thread Starter
I did a dumb thing Friday. I occasionally have to drive out west to Cisco, TX for work at my new job. From my house in the country outside of Fort Worth, that means a 90 minute drive, where 2/3 is high quality, relatively high speed, twisty back roads, and 1/3 is nicely repaved I-20. I had forgotten what a great car this is for that kind of daily driving--especially with a normal alignment. Now I'm questioning whether I can part with it. Keeping it means selling my old Tacoma and parking something else outside. RX-8 vs. Miata vs. Bimmer. The 8 is currently the only one with glycol in it. The other two are D water and MoCool at the moment. Hmmm...
Last edited by Steve Dallas; 06-16-2019 at 04:45 PM.
#84
Smoking turbo yay
The FSM lists the spec as 150kpa. It does not specify, but I assume that is the mean front vs. the mean rear. The difference between rotors is not as important as the difference between rotor faces and overall compression of each rotor. The rear rotor will coninue to deteriorate, at least as long as the car has a restrictive cat.
IMO this is okay, but I think the rear rotor deterioration has more to do with the coolant path versus whether or not there is a cat. Coolant loops around the rear rotor so there will be more heat there, which causes faster deterioration.
#85
Water Foul
Thread Starter
He is talking about the difference between rotors, where the passing spec is <100 kPa difference.
IMO this is okay, but I think the rear rotor deterioration has more to do with the coolant path versus whether or not there is a cat. Coolant loops around the rear rotor so there will be more heat there, which causes faster deterioration.
IMO this is okay, but I think the rear rotor deterioration has more to do with the coolant path versus whether or not there is a cat. Coolant loops around the rear rotor so there will be more heat there, which causes faster deterioration.
#86
Registered
Steve,
did you have adjustment extenders on your rear Ohlins?, if so how long are they,
want to order some for my KW's,
but unsure if I can just get the short ones or need the long ones?
did you have adjustment extenders on your rear Ohlins?, if so how long are they,
want to order some for my KW's,
but unsure if I can just get the short ones or need the long ones?
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sinkas (07-11-2019)
#89
Registered
I did a dumb thing Friday. I occasionally have to drive out west to Cisco, TX for work at my new job. From my house in the country outside of Fort Worth, that means a 90 minute drive, where 2/3 is high quality, relatively high speed, twisty back roads, and 1/3 is nicely repaved I-20. I had forgotten what a great car this is for that kind of daily driving--especially with a normal alignment. Now I'm questioning whether I can part with it. Keeping it means selling my old Tacoma and parking something else outside. RX-8 vs. Miata vs. Bimmer. The 8 is currently the only one with glycol in it. The other two are D water and MoCool at the moment. Hmmm...
LOL.
Thats the thing about the RX-8... it has amazing driving dynamics for certain driving conditions. Beyond that, it’s a tough call of a car / engine to maintain.
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