Injected alcohol comp ratio

Tom Goldman · 01-03-2012, 11:16 PM

Looking for some input regarding maximum compresson ratio on an Alcohol injected comp eliminator SBC.
The engine I'm working on is a 410 SBC B/ND engine ,not a very quick one.
The engine currently has a c/r of 17.3 to1 ,which I have no problem with if it was a gas engine.
I've always observed on other engines a lack of improvement when going over 15to1 on alcohol .
My concern is that the volume of fuel to burn at the afr required for alcohol will be greater with the lower c/r ,theoreticaly making more power.
does this make sense or am I mistaken about the benefit of fuel volume vs. c/r ?

01-03-2012, 11:16 PM	#1
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,436 Likes: 776 Liked 700 Times in 204 Posts	Injected alcohol comp ratio Looking for some input regarding maximum compresson ratio on an Alcohol injected comp eliminator SBC. The engine I'm working on is a 410 SBC B/ND engine ,not a very quick one. The engine currently has a c/r of 17.3 to1 ,which I have no problem with if it was a gas engine. I've always observed on other engines a lack of improvement when going over 15to1 on alcohol . My concern is that the volume of fuel to burn at the afr required for alcohol will be greater with the lower c/r ,theoreticaly making more power. does this make sense or am I mistaken about the benefit of fuel volume vs. c/r ? __________________ Tom Goldman 1500 SG , 1506 STK