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Fuel Octane Rating

 
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Shrapnel



Joined: 20 Oct 2005
Posts: 16

PostPosted: Mon Jan 16, 2006 6:08 am    Post subject: Fuel Octane Rating Reply with quote

In a booklet I read by Toyo Kogyo (i.e. Mazda) on the rotary engine it says that "regular gasoline can be used instead of high octane gasoline" and that there is basically no reason to use high octane gasoline. It says "It is a great merit of the rotary engine that the performance attainable by high octane gasoline is obtained by regular gasoline."

However, the owner's manual for my RX-8 says I should definitely use gasoline with an octane rating of 95 or higher (i.e. high octane gasoline). Can anyone explain this? What is the thinking on the best octane rating? Would appreciate any thoughts.
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Blake
Been there, done that


Joined: 12 Jul 2005
Posts: 135
Location: Portland, OR

PostPosted: Mon Jan 16, 2006 6:16 pm    Post subject: Re: Fuel Octane Rating Reply with quote

Shrapnel wrote:
In a booklet I read by Toyo Kogyo (i.e. Mazda) on the rotary engine it says that "regular gasoline can be used instead of high octane gasoline" and that there is basically no reason to use high octane gasoline. It says "It is a great merit of the rotary engine that the performance attainable by high octane gasoline is obtained by regular gasoline."

However, the owner's manual for my RX-8 says I should definitely use gasoline with an octane rating of 95 or higher (i.e. high octane gasoline). Can anyone explain this? What is the thinking on the best octane rating? Would appreciate any thoughts.


It has been true from the earliest days that non-turbo rotary engines prefer the cheap stuff, because they are not prone to detonation and idle/low-load fuel mixures were quite rich and hard to burn, but the RX-8 RENESIS engine is a whole 'nuther ballgame. While it is non-turbo, it runs higher compression and very advanced ignition timing. In other words, they are squeezing as much as possible out of it, so higher octane is necessary due to the higher combustion chamber pressure.
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