Approximate E85 BSFC

enyawix · Post by **enyawix** » Sun Mar 23, 2008 12:37 pm

What would a approximate BSFC be for E85? I am in the home work faze of an E85 engine build.

Minami Kotaro · Post by **Minami Kotaro** » Sun Mar 23, 2008 4:26 pm

My research indicates the rule of thumb is ~1.3 times the BSFC for gasoline.

For example, NA gasoline BSFC typically .4 - .5. For E85, .52 - .65.

AR 67202 · Post by **AR 67202** » Mon Mar 24, 2008 11:32 am

on the other hand, you can run more advance on the spark, possibly giving more power... also you can run more compression improving the BSFC again...

enyawix · Post by **enyawix** » Fri Mar 28, 2008 9:48 pm

So what size Injectors will I need for 590 at the crank compression will be 11:1. boost will be what ever I need for for engine dyno to read 590. Block is being balanced.

S.Bretz · Post by **S.Bretz** » Sun Mar 30, 2008 2:10 pm

If you are trying to figure the injector size you will need, go to the megamanual and look at the ethanol page. There is calculator there.

enyawix · Post by **enyawix** » Sun Mar 30, 2008 7:38 pm

S.Bretz wrote:If you are trying to figure the injector size you will need, go to the megamanual and look at the ethanol page. There is calculator there.

I used the calculator and got 65lbs sound correct?

Minami Kotaro · Post by **Minami Kotaro** » Tue Apr 01, 2008 2:03 pm

I can't find an ethanol page. The only reference to ethanol is in a table of AFRs for different fuels.

devastator · Post by **devastator** » Tue Apr 01, 2008 2:34 pm

As I remember it, I calculated my injector size for a turbocharged engine on gasoline, then multiplied the required fuel times 1.4 for E85.