premix and detonation
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Originally posted by 1FooknTiteFD
I heard if you premix, that it lowers the octane of the gas. That's all i know though..
I heard if you premix, that it lowers the octane of the gas. That's all i know though..
#7
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It can't really be that much of an octane drop. You should only add 4oz of premix when you fill up your car. www.pettitracing.com sells premix.
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Originally posted by Scott 89t2
the premix isn't going to lower the octane any lower then the stock OMP system did....
(asuming you are premixing because you removed it?)
the premix isn't going to lower the octane any lower then the stock OMP system did....
(asuming you are premixing because you removed it?)
#12
Got Boost?
Yes it does lower octane, no you shouldn't have to worry abou the change. Worst case is that the 2 stroke has 0 for a performance number, ie this stuff explodes if you look at it wrong at the temps we're talking about. Then lets say you mix at 100:1 pretty rich for a street car. OK, 100 parts of 91, vs 1 part 0... thats 91 * (100/101) = 90.1. Thats worse case... not to much to worry about more likely to be less than a .5 point hit
#14
Senior Member
Air is denser in the winter (colder something is the denser it gets simple science) The more air you have the more fuel you need. It is easier to lean out in the winter because of it.
Summer you could have detionation problems because the air is hotter going into the engine.
There you have it! There are other variables but thats about how simple I can make it.
Summer you could have detionation problems because the air is hotter going into the engine.
There you have it! There are other variables but thats about how simple I can make it.
#16
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If i'm going to get on it, then i try to add some 100 octane avgas. couple gallons to my 2-4 to my half tank when at the track. long highway trips i don't really think about it becauase, i don't get on the boost, just like under 8 psi.
#17
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I remember reading somewhere that 100:1 premix would lower the octane rating about .2 octane. Could make a difference if the air/fuel ratio is borderline to begine with.
Fred Jin
Fred Jin
#19
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128 oz's in a gallon, 20 gallons in an FD tank, ~2500 oz's of gas-o-line. I was premixing with ~1oz per 3 gallons, so wasn't concerned. My OMP is still working, however.
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