alky motor
- Thread starter briggs33
- Start date
A healthy bump in compression helps too. Unless you have an engine built to take advantage of 115 octane fuel, the gains with methanol will be minimal and the cost quite high. The engine will use twice as much fuel and the fuel will cost twice as much, so the fuel usage cost will increase roughly 400% with a power gain in the 10-15% range. That doesn't include the fact that you'll have to flush the fuel system every time you store the engine more than a day and the oil will have to be changed far more often.
Suit yourself.
You need fuel-grade methanol, not hardware store denatured alcohol(which is actually ethyl alcohol with a touch of methanol so you can't drink it). Fuel grade methanol is usually guaranteed to be 98% pure or better(usually ~99%+. Hardware store stuff isn't.
Pump E-85 is a cheaper, easier option that doesn't need a special carb nor will it eat your fuel system. The gains are smaller, however. You still need to jet up about 30%.
You need fuel-grade methanol, not hardware store denatured alcohol(which is actually ethyl alcohol with a touch of methanol so you can't drink it). Fuel grade methanol is usually guaranteed to be 98% pure or better(usually ~99%+. Hardware store stuff isn't.
Pump E-85 is a cheaper, easier option that doesn't need a special carb nor will it eat your fuel system. The gains are smaller, however. You still need to jet up about 30%.