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E85 with Roots, What Compression? #2487506
04/24/18 09:35 PM
04/24/18 09:35 PM
Joined: May 2004
Posts: 12,379
Taxes & Virus's R-US, NY
Dragula Offline OP
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I asked this of one of the local engine builders, and he wasn't sure.

The Methanol guys run +11:1 with a big blower....

What would you run on E85 and a roots blower? What would target boost be?


'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: E85 with Roots, What Compression? [Re: Dragula] #2487546
04/24/18 10:43 PM
04/24/18 10:43 PM
Joined: Jan 2003
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Hot Rod Ridge
FastmOp Offline
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FastmOp  Offline
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I run more compression on race gas

Re: E85 with Roots, What Compression? [Re: Dragula] #2487573
04/24/18 11:37 PM
04/24/18 11:37 PM
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Alexandria, LA
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Blucuda413 Offline
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I mulled over this question for a long time, read everything I could and talked to several people I respected. I settled on 11.5 in my 413 smallblock. E85 with a 6-71 and mechanical injection. Haven't run it yet but I'm getting very close.

I went with custom dished pistons and thick cometic gaskets. I went this way so that if I didn't like the blower setup it wouldn't cost a fortune to put thinner gaskets on it and have fair compression to run race gas.

Re: E85 with Roots, What Compression? [Re: Dragula] #2487578
04/24/18 11:47 PM
04/24/18 11:47 PM
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Clanton Offline
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I think 10.5 would be good with E85 and it is not as forgiving as Meth1


GOTBOOST!New improved with Victor heads.
http://www.enginelabs.com/mopar-big-bloc...t-of-necessity/
Re: E85 with Roots, What Compression? [Re: Dragula] #2487617
04/25/18 01:55 AM
04/25/18 01:55 AM
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Bend,OR USA
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I would determine how much boost you want at a specific RPM and then decide on how much mechanical compression to start with, regardless of the fuel type work twocents


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: E85 with Roots, What Compression? [Re: Dragula] #2487620
04/25/18 02:05 AM
04/25/18 02:05 AM
Joined: Dec 2007
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Great Neck,LI,new york
hemi-itis Offline
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The higher the CR,the smaller the tuning window........
I went 9:1 on gasoline.But I still street drive.


HEMI-ITIS has no cure.
My condition is fully BLOWN!!
Re: E85 with Roots, What Compression? [Re: Blucuda413] #2487661
04/25/18 08:02 AM
04/25/18 08:02 AM
Joined: May 2004
Posts: 12,379
Taxes & Virus's R-US, NY
Dragula Offline OP
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Dragula  Offline OP
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Originally Posted By Blucuda413
I mulled over this question for a long time, read everything I could and talked to several people I respected. I settled on 11.5 in my 413 smallblock. E85 with a 6-71 and mechanical injection. Haven't run it yet but I'm getting very close.

I went with custom dished pistons and thick cometic gaskets. I went this way so that if I didn't like the blower setup it wouldn't cost a fortune to put thinner gaskets on it and have fair compression to run race gas.


That's what I was thinking. If I do somthing different this year with the G3 parts I have been picking up, I was looking at a 671HH and E85 with 2-carbs....11.5:1 I figured would be a good starting point but can't find any info on anyone who has done it...Most are running either straight Methanol 14-71 hi helix or a street car on gas.

This would be race only, but I wanted to see if there was any difference between the Methanol setup and E85...I was also wondering how high can the boost be pushed....Figured, why limit it like a street engine...its alcohol right....


'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: E85 with Roots, What Compression? [Re: Dragula] #2487711
04/25/18 11:16 AM
04/25/18 11:16 AM
Joined: Oct 2007
Posts: 4,205
New York
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If you can control the spark, 20 psi is fine.
You haven't said what the blower is capable of - its efficiency range. "Roots" covers a lot of sizes and designs.


Boffin Emeritus
Re: E85 with Roots, What Compression? [Re: Dragula] #2487794
04/25/18 02:34 PM
04/25/18 02:34 PM
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texas
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thewolf1970 Offline
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You can run 11.5 to 12.5 mark sullens builds a great e-85 carb or mechanical injection from kinsler have them flow a system. I have seen 40lbs of boost with e-85 you will love it.

Re: E85 with Roots, What Compression? [Re: Dragula] #2487865
04/25/18 05:20 PM
04/25/18 05:20 PM
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northern,Ohio,USA
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Clanton Offline
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^^^ Yep go ahead and do that.


GOTBOOST!New improved with Victor heads.
http://www.enginelabs.com/mopar-big-bloc...t-of-necessity/
Re: E85 with Roots, What Compression? [Re: Dragula] #2487874
04/25/18 05:45 PM
04/25/18 05:45 PM
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Tampa
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DusterDave Offline
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Originally Posted By Dragula
Originally Posted By Blucuda413
I mulled over this question for a long time, read everything I could and talked to several people I respected. I settled on 11.5 in my 413 smallblock. E85 with a 6-71 and mechanical injection. Haven't run it yet but I'm getting very close.

I went with custom dished pistons and thick cometic gaskets. I went this way so that if I didn't like the blower setup it wouldn't cost a fortune to put thinner gaskets on it and have fair compression to run race gas.


That's what I was thinking. If I do somthing different this year with the G3 parts I have been picking up, I was looking at a 671HH and E85 with 2-carbs....11.5:1 I figured would be a good starting point but can't find any info on anyone who has done it...Most are running either straight Methanol 14-71 hi helix or a street car on gas.

This would be race only, but I wanted to see if there was any difference between the Methanol setup and E85...I was also wondering how high can the boost be pushed....Figured, why limit it like a street engine...its alcohol right....

If its race only, why bother with carbs? If it is strictly a race engine, then put a bug catcher on it. Cost wise, a pair of new E85 blower carbs vs. a good used bug catcher setup might not be that far apart.


Gone to the dark side with an LS3 powered '57 Chevy 210
Re: E85 with Roots, What Compression? [Re: DusterDave] #2487933
04/25/18 08:01 PM
04/25/18 08:01 PM
Joined: May 2004
Posts: 12,379
Taxes & Virus's R-US, NY
Dragula Offline OP
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Dragula  Offline OP
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Originally Posted By thewolf1970
You can run 11.5 to 12.5 mark sullens builds a great e-85 carb or mechanical injection from kinsler have them flow a system. I have seen 40lbs of boost with e-85 you will love it.


I think it was his carbs on my buddys E85 440 with 671, and man it runs hard! Not to mention it has a nice clean idle...




Originally Posted By DusterDave
Originally Posted By Dragula
Originally Posted By Blucuda413
I mulled over this question for a long time, read everything I could and talked to several people I respected. I settled on 11.5 in my 413 smallblock. E85 with a 6-71 and mechanical injection. Haven't run it yet but I'm getting very close.

I went with custom dished pistons and thick cometic gaskets. I went this way so that if I didn't like the blower setup it wouldn't cost a fortune to put thinner gaskets on it and have fair compression to run race gas.


That's what I was thinking. If I do somthing different this year with the G3 parts I have been picking up, I was looking at a 671HH and E85 with 2-carbs....11.5:1 I figured would be a good starting point but can't find any info on anyone who has done it...Most are running either straight Methanol 14-71 hi helix or a street car on gas.

This would be race only, but I wanted to see if there was any difference between the Methanol setup and E85...I was also wondering how high can the boost be pushed....Figured, why limit it like a street engine...its alcohol right....

If its race only, why bother with carbs? If it is strictly a race engine, then put a bug catcher on it. Cost wise, a pair of new E85 blower carbs vs. a good used bug catcher setup might not be that far apart.


As you know, I have had a Bug Catcher system. To be legal I have to run carbs or mechanical FI....I am not one for all the issues those guys have with MFI and there are no manners to it either. We will see what this season nets us...The Big Hemi is back together, and I have one last issue I need to fix, but its ready to run. It will be for sale, and I am switchiing....Its funny how many guys told me so far to put a Chevy in it.

Last edited by Dragula; 04/25/18 08:02 PM.

'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: E85 with Roots, What Compression? [Re: Dragula] #2487994
04/25/18 10:23 PM
04/25/18 10:23 PM
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northern,Ohio,USA
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Clanton Offline
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What are you looking to make hp wise?1600?That would take some big carbs.


GOTBOOST!New improved with Victor heads.
http://www.enginelabs.com/mopar-big-bloc...t-of-necessity/
Re: E85 with Roots, What Compression? [Re: Dragula] #2488000
04/25/18 10:38 PM
04/25/18 10:38 PM
Joined: Apr 2018
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NC
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we can get these up to 1600 cfm
1750 cfm with a little extra shaft and booster work

twin blade 3.jpg
Re: E85 with Roots, What Compression? [Re: Dragula] #2488002
04/25/18 10:40 PM
04/25/18 10:40 PM
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top view

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Re: E85 with Roots, What Compression? [Re: Dragula] #2488027
04/26/18 12:00 AM
04/26/18 12:00 AM

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Re: E85 with Roots, What Compression? [Re: Dragula] #2488225
04/26/18 01:06 PM
04/26/18 01:06 PM
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Motor City
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Yeah, how much are those bad boys.


1963 Belvedere 440 Max Wedge Tribute
1970 Charger R/T S.E. 440 Six Pack
1970 Challenger R/T, 528 Hemi
1970 Charger 500 S.E. 440 4 BBL
1970 Plymouth Road Runner 383
1974 Chrysler New Yorker 440
1996 2500 RAM 488 V-10 4X4
2004 3500 Dually Cummins 4x4
2012 Challenger R/T Classic.
Re: E85 with Roots, What Compression? [Re: 6PKRTSE] #2488232
04/26/18 01:19 PM
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$1,500

Re: E85 with Roots, What Compression? [Re: BaldwinCarbs] #2488236
04/26/18 01:24 PM
04/26/18 01:24 PM
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I too will be testing a twin for my Dart here soon and if it performs as well as the claims, I will be selling these for Get-M Garage just like Mr. Baldwin.............. beer


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: E85 with Roots, What Compression? [Re: Thumperdart] #2488305
04/26/18 03:20 PM
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