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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?
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?
That engine is technically passing. It is common for the rear rotor to have lower compression due to its proximity to the cat.
Originally Posted by Joe's Mazda
Those were normalized at 250 RPM and 23 feet above sea level.
You scored a rare good one at a great price. Congrats!
That engine is technically passing. It is common for the rear rotor to have lower compression due to its proximity to the cat.
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.
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.
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.
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.
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.
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.
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.
Oops! I misread that! Is there such a thing as verticle dyslexia?
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?
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.
06-15-2019, 08:36 AM
