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motofox2006 wrote:One more question if anyone knows. Going up or down in octane makes the mix richer or leaner

Neither - Mixture stays the same

So then I wont have to rejet i go told i had to

When I said, 'jetting changes may be necessary..' the subject was mixtures of this-n-that, and the blends discussed certainly had largely varying octane ratings of individual components.

What I said was NOT relative to different octanes of the SAME TYPE fuel, as a change from 91 to 93 pump gasoline.

..all of this having to do with only a guess as to what '...i go told i had to' even means.

IdahoCharley wrote:

motofox2006 wrote:One more question if anyone knows. Going up or down in octane makes the mix richer or leaner

Neither - Mixture stays the same

While going up or down in octane level does not make the mixture richer or leaner; other things can and do happen. Going down in octane to 85-87 levels may burn down the motor due to detonation within the cylinder - even though the fuel/gas mixture has not changed and the engine is running at the correct fuel curve for the power the engine is making - simply not enough octane to allow a proper wave front for the gas charge being ignited. Can result in a very damaged engine piston and cylinder.

Going too high in octane can also cost power in that without adjustments in timing and compression to take advantage of the increased resistance to detonation slightly less heat and power is produced by the engine than with the proper octane grade of fuel the engine was designed for. When I mention heat I'm talking about exhaust gas temperature which directly affects when your tuned pipe starts to perform its magic of stuffing your cylinder with extra premix and air for more power.

Right now I know how to run my bike on toluene. And I know that this is a forum for kdx's, does anyone happen to know if you can run toluene in a 4 stroke 99 yz400, its dads.

Please read a little more carefully? (something I could well do myself a whole lot of the time, btw)

Mr. Black wrote:Even when using toluene in a 4 stroke engine you still need to use the K1 kerosene.

The above I don't think is the first time that has been mentioned, but it comes from this thread.

so the details on the mixture would be the same minus the oil

Yes.

ok

Does anyone on know why if toluene is a key product in gasoline already and it makes your engine run better. Why dont they dont put more in. Is this to keep the octane down?? do you know.

motofox2006 wrote:Does anyone on know why if toluene is a key product in gasoline already and it makes your engine run better. Why dont they dont put more in. Is this to keep the octane down?? do you know.

Great question!

It boils down to economics (it's always about the dollar, ain't it?) . . . the primary goal of the corporations who produce gasoline is to maximize shareholder wealth - which is almost always maximizing profit. Why not put more of it in gasoline? Because it's worth more in other things . . . too.

Generally speaking, when crude is processed (distillation in this case) one of the cuts is naptha. Think of naptha as crude gasoline. Naptha in turn is processed (chemical reaction in this case) to form aromatic compounds such as benzene, xylene . . . and toluene.

It turns out that the majority of toluene produced is actually added into gasoline - yes, back into what it was processed from in the first place. In effect, it takes crude gasoline to make enough toluene (as well as other things) to turn crude gasoline into more useable gasoline.

But they only add enough toluene to make the gasoline we buy perform in an acceptable manner. Then they sell the rest to be used for and in other things - because it's worth more there!!