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E 85 racers, how much compression are you running now? #2465409
03/12/18 09:05 PM
03/12/18 09:05 PM
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Bend,OR USA
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Cab_Burge Offline OP
I Win
Cab_Burge  Offline OP
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Bend,OR USA
I'm finishing up a new motor for my bracket car, it is a 400 stroker motor with a set of 440-1 heads that ended up with more mechanical compression than I had originally planned on whiney
What compression ratio are you guys running in your bracket cars now?
Thanks in advance, your help is appreciated up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: E 85 racers, how much compression are you running now? [Re: Cab_Burge] #2465413
03/12/18 09:17 PM
03/12/18 09:17 PM
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bean town ....Ca
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WHITEDART Offline
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bean town ....Ca
Cab it wasn't that long ago we made 866.. on pumps junk on qmp's dyno.. that motor was around 13 to 1.. and made Power to 8200.. but was always kind of hard on the rod bearings.. I think E85 is the greatest thing since the invention of cheese.. but I think you're better off being on the safe side my opinion only


In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
Re: E 85 racers, how much compression are you running now? [Re: Cab_Burge] #2465445
03/12/18 09:53 PM
03/12/18 09:53 PM
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Glendora Ca.
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Just-a-dart Offline
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Glendora Ca.
12 to 1 here. Alum headed smallblock



"Just a Bracket car dressed up like a streetcar"
Re: E 85 racers, how much compression are you running now? [Re: Just-a-dart] #2465447
03/12/18 09:56 PM
03/12/18 09:56 PM
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Mt. Vernon, Ohio
dartman366 Offline
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I was right at 13-1 with my smallblock when I was trying E-85.


Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
Re: E 85 racers, how much compression are you running now? [Re: Cab_Burge] #2465644
03/13/18 07:28 AM
03/13/18 07:28 AM
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Mo.
racerx Offline
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Mo.
13.1 here alum.headed BB.

Re: E 85 racers, how much compression are you running now? [Re: racerx] #2465646
03/13/18 07:45 AM
03/13/18 07:45 AM
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Taxes & Virus's R-US, NY
Dragula Offline
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Taxes & Virus's R-US, NY
Guys I race with are running 15:1......on E85.


'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: E 85 racers, how much compression are you running now? [Re: Cab_Burge] #2465648
03/13/18 08:36 AM
03/13/18 08:36 AM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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Cab, if e98 is available locally, a brew with some race gas rather than pump swill might make a big difference. I have seen e98 for sale in nw Minnesota and it was much cheaper (according to a friend) than pump e85, and it was available in 55 gal drums. There would be no fed or state taxes on the e98.
If e85 is made with 86 oct, then a mix of 110 race fuel to make e80 , or 20 percent race gas, might push octane to about 113 ? I am guessing on the facts hear, but using the math for mixing race fuels. If there are local ethenol alcohol plants in the area, that might be a source. Info might be available on an e85 race site.

Last edited by gregsdart; 03/13/18 08:44 AM.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: E 85 racers, how much compression are you running now? [Re: Cab_Burge] #2465760
03/13/18 01:56 PM
03/13/18 01:56 PM
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Renton Washington
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Triple Threat Offline
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Renton Washington
My Hemi is 13.5:1 and the bearings look like new after 400 runs.

I have friends with big block chevies over 14:1 on pump E85.


-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
Re: E 85 racers, how much compression are you running now? [Re: Cab_Burge] #2465768
03/13/18 02:12 PM
03/13/18 02:12 PM
Joined: May 2015
Posts: 1,134
Lost in Time
Iowan Offline
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Lost in Time
12.5 iron heads, big block.


Have a great day
Iowan

"obsolete is neat"

Re: E 85 racers, how much compression are you running now? [Re: Iowan] #2465791
03/13/18 02:57 PM
03/13/18 02:57 PM
Joined: Mar 2008
Posts: 292
NY
challenger451ci Offline
enthusiast
challenger451ci  Offline
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NY
12:1 on a 0.030n jet in my junk.

Re: E 85 racers, how much compression are you running now? [Re: Cab_Burge] #2465820
03/13/18 03:31 PM
03/13/18 03:31 PM
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northern,Ohio,USA
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Clanton Offline
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I believe a big bore chamber will do better on knock.How much duration,overlap will you have?Stroke?[dwell at TDC]


GOTBOOST!New improved with Victor heads.
http://www.enginelabs.com/mopar-big-bloc...t-of-necessity/
Re: E 85 racers, how much compression are you running now? [Re: Cab_Burge] #2465848
03/13/18 04:22 PM
03/13/18 04:22 PM
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fredericksburg,va
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cudaman1969 Offline
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fredericksburg,va
Wouldnt the Cam have something to add to the equation ?.

Last edited by cudaman1969; 03/13/18 07:07 PM.
Re: E 85 racers, how much compression are you running now? [Re: cudaman1969] #2465912
03/13/18 06:15 PM
03/13/18 06:15 PM
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Romeo MI
MR_P_BODY Offline
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Romeo MI
I was running 14.1:1 on mine.. the cam was too
big on duration but it ran well
wave

Re: E 85 racers, how much compression are you running now? [Re: Cab_Burge] #2466026
03/13/18 09:18 PM
03/13/18 09:18 PM
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Posts: 7,348
Mt.Vernon ,Ohio
VernMotor Offline
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14:5 on ours. 3 years now

Re: E 85 racers, how much compression are you running now? [Re: VernMotor] #2466037
03/13/18 09:40 PM
03/13/18 09:40 PM
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Posts: 43,007
Bend,OR USA
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Cab_Burge Offline OP
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This motor has between 14.8 and 15.1 compression ratio checking all eight cylinders, the cam is 282@.050 intake(.457 lobe lift on both lobes, I'm using 1.61 ratio rockers) and 292@.050 on the exhaust ground on a 108 LSA installed at 103 to 105 ILC( I check the LSA at three different heights, .200, .100 and at .050 from max lift on both the intake and exhaust lobes shruggy
What little info I could find on the internet forums on E85 and calling around to guys I know who race with E85 all basically say 15.0 to 1 is the max compression ratio to use with common pump E85 work
I am going to check locally to see if I can buy a 55 gallon drum of E98 and use it to help me adjust the local pump swill E85 to get around E90 to race with luck
Hopefully I won't hurt this new rascal while learning to retune the tune up luck
Thanks to all for the help bow up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: E 85 racers, how much compression are you running now? [Re: Cab_Burge] #2466430
03/14/18 03:54 PM
03/14/18 03:54 PM
Joined: Nov 2003
Posts: 2,131
New Lenox IL
cudadon Offline
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Originally Posted By Cab_Burge
I'm finishing up a new motor for my bracket car, it is a 400 stroker motor with a set of 440-1 heads that ended up with more mechanical compression than I had originally planned on whiney
What compression ratio are you guys running in your bracket cars now?
Thanks in advance, your help is appreciated up


12.8 and I test it before filling my drums. Cam timing will help.
493 ci is being freshened right now. Ray said everything looks good!

Don

Re: E 85 racers, how much compression are you running now? [Re: Cab_Burge] #2466500
03/14/18 05:46 PM
03/14/18 05:46 PM
Joined: Oct 2007
Posts: 4,205
New York
polyspheric Offline
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New York
The max effective ratio will vary with chamber shape, valve inclination, intake valve location, VE, etc.
A small angle wedge with long stroke will tend to shroud the intake valve with a high CR, and also mask flame travel.


Boffin Emeritus
Re: E 85 racers, how much compression are you running now? [Re: polyspheric] #2466538
03/14/18 06:39 PM
03/14/18 06:39 PM
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dogdays Offline
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Not arguing with Poly at all here, he cites a very specific case, but IN GENERAL:

Flame travel for a quiescent mixture in a gasoline engine is woefully slow. As the rpm and stroke length increase, the flame travel is even less than the piston speed! That's why squish is so very important, it mixes the flame through the chamber which speeds up the lighting off process.
Because the flame travel is slow, larger diameters give longer time for the flame to travel and give more time for the mixtures out at the ends of the flame path time to form knock-prone compounds.
As a result, with everything else being equal, larger diameter cylinders need more octane.

R.

Re: E 85 racers, how much compression are you running now? [Re: Cab_Burge] #2466547
03/14/18 06:53 PM
03/14/18 06:53 PM
Joined: Jan 2003
Posts: 19,304
Las Vegas
Al_Alguire Offline
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Las Vegas
There are alternatives to pump E85. Torco, VP and I'm sure others sell their versions of E85. We picked up a solid 2 tenths switching from pump to VP. I know others with similar results at your compression ratio as well. Let me add that at the time finding DECENT E85 in Vegas was a challenge which prompted our switch to drums

Last edited by Al_Alguire; 03/14/18 06:54 PM.

"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"
Re: E 85 racers, how much compression are you running now? [Re: Al_Alguire] #2466732
03/15/18 01:27 AM
03/15/18 01:27 AM
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Posts: 1,454
Glendora Ca.
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Just-a-dart Offline
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Glendora Ca.
Originally Posted By Al_Alguire
There are alternatives to pump E85. Torco, VP and I'm sure others sell their versions of E85. We picked up a solid 2 tenths switching from pump to VP. I know others with similar results at your compression ratio as well. Let me add that at the time finding DECENT E85 in Vegas was a challenge which prompted our switch to drums


So what you are saying Al is when racing in Vegas I should bring my own alcohol?



"Just a Bracket car dressed up like a streetcar"
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