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Old 08-08-2010, 07:56 PM   #1
chief11885
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Default Running E-85 and missing at low rpm

I have a 383 with AFR eliminator heads and i had a 750 holley converted to E-85. The motor was running great with Premuim but now it is missing at lower rpm(1200-3000). I am running an autolite plug that is rated at a D11 heat range and I don't know if it is to cold or not I was running the Champion RC9YC plug and it was alittle colder then the autolite. The timing is locked to 38 degrees of timing. Anyone know what the problem might be, Mark sullens did the carb for me and he doesn't know what the problem might be he said that is sounded like it was cold but the engine temp was about 180Degrees. Thanks Josh
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Old 08-08-2010, 08:40 PM   #2
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Default Re: Running E-85 and missing at low rpm

try running a smaller plug gap. it helped our 406 run better. alcohol is harder to ignite
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Old 08-08-2010, 08:54 PM   #3
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Default Re: Running E-85 and missing at low rpm

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Originally Posted by chief11885 View Post
I have a 383 with AFR eliminator heads and i had a 750 holley converted to E-85. The motor was running great with Premuim but now it is missing at lower rpm(1200-3000). I am running an autolite plug that is rated at a D11 heat range and I don't know if it is to cold or not I was running the Champion RC9YC plug and it was alittle colder then the autolite. The timing is locked to 38 degrees of timing. Anyone know what the problem might be, Mark sullens did the carb for me and he doesn't know what the problem might be he said that is sounded like it was cold but the engine temp was about 180Degrees. Thanks Josh
That doesn't sound like an answer you would get from Mark. Ask him about it again, he may have misunderstood the way you phrased the inquiry to him.
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Old 08-08-2010, 08:59 PM   #4
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Default Re: Running E-85 and missing at low rpm

like how much gap i am currently at .035 on the gap thanks Josh
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Old 08-09-2010, 01:34 PM   #5
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Default Re: Running E-85 and missing at low rpm

we put ours down to .030 and the motor ran cleaner. may not be the answer but it didnt cost anything to try.
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Old 08-09-2010, 08:20 PM   #6
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Default Re: Running E-85 and missing at low rpm

I am going to try some smaller jets in the primary to see it this helps any. The i might try the plug gap thanks.
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Old 08-09-2010, 10:13 PM   #7
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Default Re: Running E-85 and missing at low rpm

I don't run over .25 with ethanol, Mark is a great guy just call him back. If he did your carb for Ethanol I will guarantee that it's not the carb. A bad plug wire will act up down low more so than in the upper rpm.
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Old 08-10-2010, 12:31 PM   #8
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Default Re: Running E-85 and missing at low rpm

What ignition system are you running? If you are running a MSD 6 or a 7 with the round coil you don't have enough ignition system to fire the fuel.
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Old 08-10-2010, 01:57 PM   #9
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Default Re: Running E-85 and missing at low rpm

is a msd DIGITAL 6 and this coil enough????
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Old 08-10-2010, 04:05 PM   #10
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Default Re: Running E-85 and missing at low rpm

I use a 6al and blaster ss coil, plugs gapped at .035 without any problems.
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Old 08-10-2010, 07:24 PM   #11
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Default Re: Running E-85 and missing at low rpm

The msd 6 is not enough ignition system. You maybe making it work but you are missing out on alot of hp. I did a test on the dyno with my 632 on ethanol we started with a dig.7 and the good coil for it and made 1193hp we then put a msd 10 on the motor and made 1251hp (58hp more than the dig 7) the next thing that we did was we put a msd 12amp mag in it and made 1311hp (118hp over dig 7). When we first dynoed the motor with the dig. 7 the motor ran fine and made great power, we did not think that we had any issues. We tryed the new igniton system just to see what it would do, So in a nutshell we stumbled onto something with the ignition systems with ethanol. I'm just trying to pass on some info that I learned on the dyno, if this helps anyone then great. I didn't think that I had any issues with the dig. 7 either but it proved me wrong.
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Old 08-10-2010, 10:47 PM   #12
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Default Re: Running E-85 and missing at low rpm

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Originally Posted by Bammer540 View Post
The msd 6 is not enough ignition system. You maybe making it work but you are missing out on alot of hp. I did a test on the dyno with my 632 on ethanol we started with a dig.7 and the good coil for it and made 1193hp we then put a msd 10 on the motor and made 1251hp (58hp more than the dig 7) the next thing that we did was we put a msd 12amp mag in it and made 1311hp (118hp over dig 7). When we first dynoed the motor with the dig. 7 the motor ran fine and made great power, we did not think that we had any issues. We tryed the new igniton system just to see what it would do, So in a nutshell we stumbled onto something with the ignition systems with ethanol. I'm just trying to pass on some info that I learned on the dyno, if this helps anyone then great. I didn't think that I had any issues with the dig. 7 either but it proved me wrong.
Is this a blown engine, nitrous, or n/a?
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Old 08-11-2010, 10:05 AM   #13
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Default Re: Running E-85 and missing at low rpm

It is a N/A Top Sportsman engine.
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Old 08-11-2010, 03:40 PM   #14
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Default Re: Running E-85 and missing at low rpm

All I have is a measely N/A 406 that makes 520tq/530hp.
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Old 08-11-2010, 03:57 PM   #15
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Default Re: Running E-85 and missing at low rpm

My Vega running E98 initially stumbled out of the hole and like a bat out of hell would then take off. The lack of tuning knowledge on my part had me over fueling down low. I started leaning it out and it started going away until I was right where I wanted to be.
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