Alcohol/Nitro

[GOBRDGO]

Doing strictly the necessary mods to make a saw run on alcohol what is roughly the performance percentage gain? Does nitro necessitate more than carb mods to experience gains? I'll make basic muffler mods a given to the saws in question. Thanks

 

[Al Smith]

Back in the day I can remember the carbs on go-karts frosting up because the alky vaporized so fast.They blew blue flames from the exhaust when at idle.Don't know about the carb mods,"Google" it.

 

[timberwolf]

Al, are you sure about the alcohol vaporizing faster? From What I understand it vaporizes slower with a "lower" vapor pressure and higher flash point than pump gas. which works into its octane rating in the 140+ range. The icing is more likely a result of; (a) the increased quantity of fuel, (b) the increased latent heat of vaporization as alcohol draws a lot more heat than pump gas as it evaporates.

I am still early in the learning curve on the alky stuff though.

 

[timberwolf]

As far as the carb, you need to be able to put at least 9:1 in for E100 and 6:1 for meth as oposed to 14:1 for gas. Also alcohol if I am not mistaken likes to be on the rich side of stoiometric for max HP. Pump Gas produces max exhaust pressure at about 20% rich, alcohol is more like 40%.

As far as the carb mod the diamiter of the orffices will need to be effectivly opened by ~30% for ethyl or ~40% for meth. to accomdate the increased fuel requirment, the fuel viscosity also plays a factor in this, as the viscosity and density of pump gas and alcohol. That is the weight of alcohol or pump gas that will flow through a given carb opening at a given pressure is not the same.