Compressions Ratio's and boost, 93 VS e85
Thread Starter
On The Tree
Joined: Mar 2009
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From: Kemah
Compressions Ratio's and boost, 93 VS e85 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?
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?
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?
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?
Thread Starter
On The Tree
Joined: Mar 2009
Posts: 121
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From: Kemah
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...
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
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.
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.
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...
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...
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Verdad Gallardo 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
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
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...
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.
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.
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.
Thread Starter
On The Tree
Joined: Mar 2009
Posts: 121
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From: Kemah
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 
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.
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.
pm me a link if so. been looking
