87 octane and rattling at 6000 RPM!
#26
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Originally posted by JimW
Zoom44, That was and interesting read. Thanks for the hook-up, but I'm pretty sure it was pinging that I heard. If that sound was from the resonance intake ports switching, I would notice this no matter what octane I used. I only heard this while using 87 octane and then after I switched back to 93 the sound went away. I have to say it was extremely hot and humid out and I'm at sea level so that might have contributed along with some lousy 87 octane to the situation. Jason is right, if it states it in the manual that 87 octane is acceptable and it nets us better MPG then damit, the car shouldn't do this. After this episode I do not want to use 87 octane again, it is to risky.
Zoom44, That was and interesting read. Thanks for the hook-up, but I'm pretty sure it was pinging that I heard. If that sound was from the resonance intake ports switching, I would notice this no matter what octane I used. I only heard this while using 87 octane and then after I switched back to 93 the sound went away. I have to say it was extremely hot and humid out and I'm at sea level so that might have contributed along with some lousy 87 octane to the situation. Jason is right, if it states it in the manual that 87 octane is acceptable and it nets us better MPG then damit, the car shouldn't do this. After this episode I do not want to use 87 octane again, it is to risky.
an analogy- smoking increases the risk of heart disease. some who smoke will never have heart disease. but others who are stressed out more in their daily lives and have horrible diets,compounding risk factors, will.
Last edited by zoom44; 07-01-2004 at 07:09 PM.
#28
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Originally posted by Mag66
Interesting that the Manual says this.. as both the updated "short guide" and the 'quick tips' booklet that I got which have a print date of April 04 and May 04 respectively.. clearly state to use 91 Octane only... and not to use any lower octane gas.
Interesting that the Manual says this.. as both the updated "short guide" and the 'quick tips' booklet that I got which have a print date of April 04 and May 04 respectively.. clearly state to use 91 Octane only... and not to use any lower octane gas.
FWIW, I've been using primarily Shell 87 octane for all of my 9k miles with no issues - I guess I better start saving up for a new engine .
rx8cited
#29
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MEGAREDS, Yes. That's the exact description that I read. Using the lower octane in winter months does make a lot of sense as well. Thank You all.
#30
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The Mazda service department I took the car to said to use the lower octane to help avoid flooding. I don't know if that's good or bad advice - but the 89 octane has been no problem for me since changing over to it... see the log in my signature for details.
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