Tx91z28

ok here's the deal, im getting started on my first FI build, single TC76 on a small block 350, and i was planning on going 8.5:1 and cranking the boost as much as i can on 93.

but now there are a bunch of new e85 stations around me, and i found a all forged small block for CHEAP that i may buy, that will have my compression ratio up around 10 depending on heads , 10.5 with my current heads. if i convert to e85, would it be safe with this compression ratio to run 10+ psi?

moehorsepower

iTrader: (3)

10lbs might be pushing it on that compression, do you want to run 10lbs? or are you thinking that you will need 10lbs for your horsepower goal? Just remember E85 takes a lot more fuel than gasoline so you will need a larger carb or injectors, If carbed they have ready built E85 carbs...

Zombie

iTrader: (2)

It would be much better to go 8.5: and run 20psi on e85... If you could get traction and enough fuel to the engine.

Tx91z28

i want to run a 10.5,m6, on pump gas(or e85 if its significantly easier), with a 350cid motor, single turbo, fuel injected, with no spray (except maybe to spool up)

the suspension/m6 is BUILT, ready to go, i have 1/3 of the hot side fabbed, and the dp layed out, cold side is not going to be a problem to fab. i can have an all forged 350 with whatever pistons i desire pretty easy, and i have 58cc aluminum heads.

im just need to get my fuel/long block ready. so basically i need the correct combo of the right injectors, stock fuel lines should be adequate, pistons, and fuel pump/fuel choice and im good to go, just assemble and tune

Big_Bird_WS6

iTrader: (7)

ok first, zombie. isnt Mightmouse running 8.5:1 at like 28psi? on 91 oct. yes he has meth but still that is cool.

and for op. i am building motor to run 10.2:1 with 18psi on e85.

there is four or five guys on here that are running 9.5:1 with like 21 psi. so i sould be fine. you should be fine to.

i wouldnt worry at all about 10psi.

camarols1

iTrader: (17)

I would go 10:1 for a dedicated e85 turbo build for sure.
I wanted to be able to run 93 oct if the e85 availability goes away, so I split the difference and built the motor at 9.25:1
This should plenty save for 18+psi given a safe tune.
My previous setup was a 10:1 iron sbc with a procharger at 12ps1. It screamed, and I never saw even a hint of detonation on the plugs.
My $.02 for the day...

Nimitz87

iTrader: (17)

if its a street car I'd want to keep CR at least 9:1.

Chad

Grr

iTrader: (2)

do it, theres N/A guys running E85 at 15:1 with no problems, and i would have no problem boosting a 11:1 motor even, the fuel just loves it and you can make some insane power

moehorsepower

iTrader: (3)

Built bottom end, then no problem running the 10 lbs. Again just remember it takes more E85 to reach you A/F target. So if you were needing say 36LB injectors for gas then you would need larger injectors like maybe a 50lb injector to keep your duty cycle in the normal range..of course you will need the pump to push all that fuel also...Good Luck...

veee8

iTrader: (40)

MM runs race fuel for high boost.
I would not worry about 10 psi and compression with E85.
I am raising the compression slightly, and going to run more boost on the new setup. Going to run E100 and my own blend E85 though. Not liking the stuff that is coming out of the pump always.

Tx91z28

alright well you guys have convinced me e85 in the way to go soooo 10.5:1 it is. an when i said 10psi, i threw that figure out there because thats what i hear 10:1 or so maxes out at on 93, but if i can run 18+psi on e85 im going to run as much as i can safely, because turning up the boost = easy power. thanks again guys

Big_Bird_WS6

iTrader: (7)

you got a machine to make the e85 for you?

pm me a link if so. been looking

veee8

iTrader: (40)

Nope, just buying the E100 by the barrel.