vp racing fuels

[SV88]

MR9 and MR12 are different animals.  A very narrow distribution of 9/12 chain hydrocarbons.  These fuels are more oxiginated (thena the wider distribution conventional fuels) which is why you generally make more power, so in effect you are running leaner.  Since they are more refined/distilled, they cost quite a bit more.  The market is very narrow so supply and demand economics come into play.

[roadracer162]

I am baffled...hehehe

[tzracer]

What I cannot figure out is that inline 4s tend to be able to run higher compression ratios (my R6 is around 13:1) than V-twins without having to resort to 100+ octane levels.  An sv with a 13:1 probably needs to run at least 100 octane to not detonate.

It has to do with piston diameter. The larger the diameter, the longer the path for the flame, the greater the chance for detonation.

[Burt Munro]

It has to do with piston diameter. The larger the diameter, the longer the path for the flame, the greater the chance for detonation.

You talk like you're some kind of Physics Professor or something!