E85 plug gap?
TECH Fanatic
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Wicked IIRC you asked me this and I pointed you to the E85 facts and myths thread on yb. The experts with e85 say use a richer afr(gas scale) than you would with gasoline(10.1:1-10.9:1) and a 7 or 8 plug under big big boost. Fatten it up with the 9 range plugs you have now till it wants to foul/break up from fuel, and then step the heat range up. Do this and repeat till you feel comfortable.
I also heard some where the other day that you read the top of the porcelain with e85 unlike the bottom ring on the porcelain of a gas plug.
That is what the experts over there are saying. I have no experience, but if e85 is anything like methanol, the more you can burn and fit into the combustion chamber and light off and use the more power you will make.
I also heard some where the other day that you read the top of the porcelain with e85 unlike the bottom ring on the porcelain of a gas plug.
That is what the experts over there are saying. I have no experience, but if e85 is anything like methanol, the more you can burn and fit into the combustion chamber and light off and use the more power you will make.
TECH Fanatic
Joined: Oct 2011
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I have always had good luck with 7 heat range copper plugs (iridiums seem to like to foul easily) with a 24-26 gap on e85. I had cold start and fouling issues on previous cars with 1 step colder iridiums. Switched to 7 heat range ngk coppers and everything ran just fine.
Well it hasn't scattered yet at least. I'm no expert but 22*@12psi isn't a whole lot for e85.......
Last edited by gsxr1k2; Apr 4, 2012 at 01:31 PM.
Just to update the thread i ended up running a. 30 gap on a TR8 plug and didnt have any issues with the spark blowing out or knock and we went to 18psi on the dyno and just short of 1000 crank hp. Also my motor is around 12:1 cr. I believe timing is at 17deg.
Nice! What injectors are you running?
I've ran NGK 7's and 8's in the JY 5.3 both at 24.5lbs. I switched from the 7's to the 8's as the 7's looked like they had too much heat in them, but we do make long hard pulls on the street back to back so I'm not exactly easy on it, lol.
I'm running NGK TR6, always have. Idles great and never breaks up. Made the numbers below on 19psi at 14* timing, low 11's AFR. Not sure of the gap right now but used to run .28 at the 700rwhp level. I think my set-up is good for 900rwhp if I dumped the wastegate and added more timing into the tune.
I'm running NGK TR6, always have. Idles great and never breaks up. Made the numbers below on 19psi at 14* timing, low 11's AFR. Not sure of the gap right now but used to run .28 at the 700rwhp level. I think my set-up is good for 900rwhp if I dumped the wastegate and added more timing into the tune.
Sounds like you got it close, good numbers.
Maybe lean it out a tenth or two and see what it does then.
