10.8:1 compression + Full Time E85 + 21psi.....will it work OK...?
08-19-2013, 09:32 AM
#1
10.8:1 compression + Full Time E85 + 21psi.....will it work OK...? Reason I ask is......I built my new iron AES 390ci for boost but right now it's at 10.8:1 compression with 68cc heads and flat top pistons.
I want to go 21psi and E85.
But I can't find any heads, with a THICKER DECK, that has larger chambers than 68-70cc.
Am I screwed or will E85 and 10.8:1 be PERFECTLY FINE, no issues at all...???
-----South Florida heat-----
Thanks.
.
I want to go 21psi and E85.
But I can't find any heads, with a THICKER DECK, that has larger chambers than 68-70cc.
Am I screwed or will E85 and 10.8:1 be PERFECTLY FINE, no issues at all...???
-----South Florida heat-----
Thanks.
.
Last edited by LS6427; 08-19-2013 at 09:41 AM.
08-19-2013, 12:21 PM
#6
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No need for meth, e85 will be fine. I know with 6266's you'll net right around 950rwhp at 15lbs. As long as you find a source for e85 that is consistent you shouldn't worry, but to be safe if youre running it from the pump you might want to get a E85 tester to be safe. What turbo(s) are you running and what are the specs of the motor, there are a lot of variables that will determine what you'll be able to safely make.
08-20-2013, 12:23 AM
#7
No need for meth, e85 will be fine. I know with 6266's you'll net right around 950rwhp at 15lbs. As long as you find a source for e85 that is consistent you shouldn't worry, but to be safe if youre running it from the pump you might want to get a E85 tester to be safe. What turbo(s) are you running and what are the specs of the motor, there are a lot of variables that will determine what you'll be able to safely make.
Putting a fully built 4L80E tranny in and changing from 3:73 gears to 3:23 I think.
I'm gonna use the Modular Turbo TT kit with A2W IC.....I'll use whatever turbos will get me to my 1,200 RWHP goal.......
100% roll racer......It will never see a drag track.
Plenty of E85 stations around here.
I'll even pull the engine and change the pistons if I have to. It's 1,200 RWHP or bust.......
.
Last edited by LS6427; 08-20-2013 at 02:38 AM.
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08-20-2013, 07:05 AM
#12
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Why didnt yo go with a dished boost piston. I ended up getting custom dished diamond pistons to get me to close to 10:1. If 1,200rwhp is the goal you might want to consider swapping out the pistons. Might take more than 21lbs of boost to hit 1200 rwhp with that driveline.
08-20-2013, 07:56 AM
#13
I will be at 9.8:1 but a part of me wishes i had gone 10.6:1 like i originally planned. I wouldnt really hesitate to go 10.8:1 if you will be running E85 all the time. The only reason i dropped mine down some is because i will be moving quite a bit and am not positive ill be able to get E85 everywhere i end up.
08-20-2013, 07:51 PM
#16
Sorry, everytime I read one of your threads it feels like talking to a brick wall.
Your compression is too high. 72cc heads are the biggest and probably still too high.
You asked a lot of questions about shortblocks and still ordered a flat top piston. Don't know why?
1200rwhp out of a 390 can be done but expect frequent engine rebuilds. I'd be shooting for 800-900. Thats still an 8 second street car.
Your compression is too high. 72cc heads are the biggest and probably still too high.
You asked a lot of questions about shortblocks and still ordered a flat top piston. Don't know why?
1200rwhp out of a 390 can be done but expect frequent engine rebuilds. I'd be shooting for 800-900. Thats still an 8 second street car.
08-20-2013, 08:15 PM
#17
If it was a race car it would be fine IMO. I do know guys running 10.5:1-11.5:1 on E85 even non intercooled at 1000rwhp well into the low 5 second range. They are pretty experienced tuners and know their engine well and what it likes and doesn't like, as they have blown them up on occasion!
The answer is yes and no. Will it do it, yes. Is it reliable in a street car where you're not going to be tuning it yourself and mercilessly beating on it? Probably not the best idea.
If you dropped it down to 10.0:1 IMO you'd be fine.
The answer is yes and no. Will it do it, yes. Is it reliable in a street car where you're not going to be tuning it yourself and mercilessly beating on it? Probably not the best idea.
If you dropped it down to 10.0:1 IMO you'd be fine.
08-20-2013, 09:03 PM
#18
TECH Enthusiast
Sorry, everytime I read one of your threads it feels like talking to a brick wall.
Your compression is too high. 72cc heads are the biggest and probably still too high.
You asked a lot of questions about shortblocks and still ordered a flat top piston. Don't know why?
1200rwhp out of a 390 can be done but expect frequent engine rebuilds. I'd be shooting for 800-900. Thats still an 8 second street car.
Your compression is too high. 72cc heads are the biggest and probably still too high.
You asked a lot of questions about shortblocks and still ordered a flat top piston. Don't know why?
1200rwhp out of a 390 can be done but expect frequent engine rebuilds. I'd be shooting for 800-900. Thats still an 8 second street car.
08-21-2013, 11:23 AM
#20
Sorry, everytime I read one of your threads it feels like talking to a brick wall.
Your compression is too high. 72cc heads are the biggest and probably still too high.
You asked a lot of questions about shortblocks and still ordered a flat top piston. Don't know why?
1200rwhp out of a 390 can be done but expect frequent engine rebuilds. I'd be shooting for 800-900. Thats still an 8 second street car.
Your compression is too high. 72cc heads are the biggest and probably still too high.
You asked a lot of questions about shortblocks and still ordered a flat top piston. Don't know why?
1200rwhp out of a 390 can be done but expect frequent engine rebuilds. I'd be shooting for 800-900. Thats still an 8 second street car.
Back when I asked all those questions almost everyone said I can go 21psi with high compression and E85. Now I'm hearing differently........so, that naturally breeds more questions.
.