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What compression ratio to run on super charged E85 motor? #3074992
09/06/22 11:29 PM
09/06/22 11:29 PM
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Bend,OR USA
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Cab_Burge Offline OP
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I'm in the middle of buying and planning on which parts to use to make around 2500 HP (hopefully luck) out of 572C.I. B1-MCwedge motor using a Vortech crank driven V30-123A super charger with a Holley Dominator EFI system using E85.
I've look around a little bit on the internet E85 web sites but no help yet, anyone on here have a set up similar to my build?
If so, I would really appreciate any and all comments and help help Thanks in advance bow up

Last edited by Cab_Burge; 09/06/22 11:30 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: What compression ratio to run on super charged E85 motor? [Re: Cab_Burge] #3074998
09/06/22 11:56 PM
09/06/22 11:56 PM
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New York
polyspheric Offline
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Sorry, can't provide an actual number, but the effective pressure ratio will vary (roughly) proportionate to the square of blower (centrifugal or turbo) RPM, so really big numbers @ peak power are relatively safe at lower speeds.
Roots and screw types have much greater pressures at moderate speeds.

http://victorylibrary.com/mopar/blower/blower-choices3.htm

There are charts on line that purport to calculate blown CR from static CR and boost. They fail.
All they do is add boost pressure to ATM, divide by ATM, then multiply by static CR. What actually happens is not even close.
Better physics: http://victorylibrary.com/mopar/blower/blower-engine5.htm


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Re: What compression ratio to run on super charged E85 motor? [Re: Cab_Burge] #3075014
09/07/22 03:47 AM
09/07/22 03:47 AM
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Assuming your base engine makes about 900 hp, and counting in the power loss of the super charger, you need about 30 psi of boost to make 2500 hp. I wouldn't go too high with the CR, 10-10.5:1 is what I would use.


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Re: What compression ratio to run on super charged E85 motor? [Re: jyrki] #3075087
09/07/22 10:52 AM
09/07/22 10:52 AM
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NW Indiana
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Originally Posted by jyrki
Assuming your base engine makes about 900 hp, and counting in the power loss of the super charger, you need about 30 psi of boost to make 2500 hp. I wouldn't go too high with the CR, 10-10.5:1 is what I would use.


I agree. You can go higher but your tuning window gets narrow.

Re: What compression ratio to run on super charged E85 motor? [Re: fbs63] #3075090
09/07/22 11:25 AM
09/07/22 11:25 AM
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Lake Villa Il
INTMD8 Offline
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Agree with the above.

If I was running a class that was power limited due to the supercharger rules I would start pushing compression up higher.


69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
Re: What compression ratio to run on super charged E85 motor? [Re: Cab_Burge] #3075101
09/07/22 12:04 PM
09/07/22 12:04 PM
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Kalispell Mt.
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You wanting to run pump e-85 or mix your own? If mix your own are you going to run some kind of leaded race fuel or 100 octane or pump gas for the 15% gasoline???


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: What compression ratio to run on super charged E85 motor? [Re: HotRodDave] #3075107
09/07/22 12:20 PM
09/07/22 12:20 PM
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Lake Villa Il
INTMD8 Offline
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I would still think methanol would be better for that.


69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
Re: What compression ratio to run on super charged E85 motor? [Re: Cab_Burge] #3075127
09/07/22 01:08 PM
09/07/22 01:08 PM
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I would talk to Scott Koffel. I spoke to him years ago about building a blown B1 motor
and he had no problem sharing proven recipes

Re: What compression ratio to run on super charged E85 motor? [Re: B1duster] #3075133
09/07/22 01:33 PM
09/07/22 01:33 PM
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Bend,OR USA
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Originally Posted by B1duster
I would talk to Scott Koffel. I spoke to him years ago about building a blown B1 motor
and he had no problem sharing proven recipes

I am planning on talking to him also about this also up
I bought all my original B1 parts from Koffels, Scott and Dave are very helpful up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: What compression ratio to run on super charged E85 motor? [Re: HotRodDave] #3075137
09/07/22 01:41 PM
09/07/22 01:41 PM
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I'm hoping that the local pump E85 will work, I'm thinking I'll slow the blower drive down to start with and then turn it up on the boost and other tuning options luck
This plan has a lot of new things I'm going to have to learn about including the EFI tuning luck


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: What compression ratio to run on super charged E85 motor? [Re: Cab_Burge] #3075140
09/07/22 01:58 PM
09/07/22 01:58 PM
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Originally Posted by Cab_Burge
I'm hoping that the local pump E85 will work, I'm thinking I'll slow the blower drive down to start with and then turn it up on the boost and other tuning options luck
This plan has a lot of new things I'm going to have to learn about including the EFI tuning luck


I've read that E85 percentage at a gas station are not always consistent ???


running up my post count some more .
Re: What compression ratio to run on super charged E85 motor? [Re: JohnRR] #3075179
09/07/22 03:06 PM
09/07/22 03:06 PM
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Your correct, I do test it before using it, the local pump E85 fuel use to vary between 70 to 85% depending on the time of year. Less Ethanol in the fall, Winter and spring., 85 % in the months of April to October back 5 years or more ago.
the last 4 times I've bought E85 from them it was dead on 85%, I do see a change in the Ethanol content when it sits in my plastic fuel jugs in the car trailer over 3 months, the gasoline evaporates and the Ethanol content test from E87 to E89 % shruggy
I'm hoping the wide bans on the Holley Dominator EFI ECU will make the needed changes in the close loop settings for that fuel luck
I've heard that the NTK O2 wide band sensors are the best ones to use on any alcohol EFI self tuning systems, what do you think about them?
Onward and upwards with hopefully more HP luck whistling grin


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: What compression ratio to run on super charged E85 motor? [Re: Cab_Burge] #3075258
09/07/22 06:31 PM
09/07/22 06:31 PM
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Lake Villa Il
INTMD8 Offline
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I run a composition sensor with the Holley. Will adjust fueling (and timing) on it's own based on alcohol content so you don't have to rely on the wideband(s) to make big changes.


69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
Re: What compression ratio to run on super charged E85 motor? [Re: INTMD8] #3075443
09/08/22 10:04 AM
09/08/22 10:04 AM
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Hot Rod Ridge
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11.5 to 1

Re: What compression ratio to run on super charged E85 motor? [Re: Cab_Burge] #3076223
09/11/22 06:04 AM
09/11/22 06:04 AM
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NY
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Just found this on Facebook
2400 HP

D7079676-1239-4EFD-8670-5363AC6CF7B0.png
Re: What compression ratio to run on super charged E85 motor? [Re: B1duster] #3076242
09/11/22 08:19 AM
09/11/22 08:19 AM
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ihave my 610 cuin hemi at 9.57 to 1with a f-2 procharger , big tuning window, first pull with a educated guess tune up it made 1381 hp at 16 lbs of boost at 6300 rpm on out of the pump e-85 it was acually e-87 ran a 5.68 in the 1/8 on the street at roadkill nights pontiac mi in a 3960 lb street trim car but i drive it more than race it thats why i went with e-85


606 hemi pump gas best 9.60 at 142mph on motor
05 hemi daytona 1500 go-mango 4wd quadcab
2007 hotrod mag pump gas drags runner up, roadkill nights dodge big tire winner 2018 2019 back to back






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