E85 carb tuning

Old 06-24-2007, 02:58 PM
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Join Date: Apr 2003
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Default E85 carb tuning

If anybody cares I'm running e85 on a S/pro et Pinto with good luck! The engine is a 358 sbc with about 425 hp! The carb is a 750 proform center sec.,65 idle air bleeds,35 hi speeds bleeds,.120 gas needles,.125 pvc with 3.5 pv in front an 85 jets,pluged rear 95 jets,8 lbs.fuel psi.! It does not milk up your an runs cool,has 105 octan! I have ran best of 6.54 @103.50 to 6.67 from spring till the heat of june!
racingtlc is offline  
Old 07-09-2007, 07:08 PM
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I'm interested in hearing a little more about your engine combination. I am also running E-85 and trying to get it sorted out. My engine is a 355 with Dart 215 platinum heads, 13:1 comp, [email protected] .050 ultradyne flat tappet and a kinda home done carb. Im using an old alcohol main body with Quick Fuel metering blocks. I wanted to see if I like it before I spent the cash for an E-85 carb.

I am currently running a 94/96 jet combo with no power valves and 37 deg. locked timing. The jetting seems to be pretty close, but I was curious what you are doing for timing. I've tried to run a power valve in mine, but it won't run the number with one. I ran 4.5 with 86 jets, the driveability is much better on the street, but it is about .2 and 3 mph off at the track.

Any help would be greatly appriciatied

Thanks Alot

Darinj is offline  
Old 07-24-2007, 09:11 AM
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Default TIMING on E85

The anti-detonation properties of the E85 are VERY good...they can be decieving! I have a 406/AFR 227's/Super victor/13.3:1 forged bottom. I've been playing with this combo for a while to get it right and I'm almost ready to try it at the track.
On race fuel, I could run 36-38* timing, on the E85 I can advance it to 42* without a problem. That's where it gets decieving...the engine will make the most power at LESS TIMING than with the race gas! I recently talked to someone with a 434sbc on the dyno made his best HP with race fuel at 36* and made no other changes than swapping to E85. The engine responded with more HP and TQ than the race fuel at two degrees less timing (34*) and seemed more responsive. So, 2* less than race gas!
Another thing to keep in mind is that the E85 likes heat. I was running a 160* thermostat with the gas, but idling with E85 at 160* was a bit unstable ( this fuel is picky about the mixture). Changing to a 180* thermostat helped to get a cleaner/more stable idle mixture and made the throttle pedal even more crisp. I may even experiment with a 195* thermostat to see if that helps even more.
I'm currently running an AED 950 carb converted to E85 (by them-they sell 'em too) It wasn't a "bolt on" for me. I've had to do some research and change a few things to make it right-sort of trial and error style. What I've ended up with that's working for me now jet wise is 75 primary with 4.5 power valve. The PVCR's have been drilled out to .076" for additional fuel on demand. All 4 IFR's are at .043" . The secondary jets are drilled out to a .089" (not a 89 jet) and the power valve is blocked off. High speed (main) air bleeds are .038" and idle bleeds are .067". Both squirters are .042". My emulsion bleeds from top to bottom are .031", blank,.031", blank.
You can use a numbered drill bit set to measure what you have BEFORE you start changing things so that you know what your base line is before making any adjustments. This way you can always go back to the previous setting if whatever you changed was wrong.
Hope some of my trial and error will help make it easier for somebody.
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