Posted by ChadS on July 28, 2008 at 10:58:21 from (66.228.96.244):
In Reply to: 105 octane gas posted by N.D. Farmall H Puller on July 28, 2008 at 10:20:01:
Mix in some E85 with your pump gas. At 150 psi, you can mix in a quart of E85 to 1 gallon 93 octane pump gas and pick up 2-5 more hp. You will have to retune the engine, mainly timing adjustment, and a bigger jet in the carb if you cannot back the main load adjustment screw out and make it run rich now. If your pulling it to its knees, then you need to think small on the carb venturi, a #25 will be good to enhance low end torque, a 27 for more of a high rpm setup. (if your running the M style carb) Dont worry about the E85 and the carb parts, it wont hurt it. Timing will be a bit more retarded once the E85 is dialed in. A #23 venturi will help the best for low end torque, when you run rpm, you do need more air to flow, but thats not whats going on here,, your lugging way below, even below rated rpm 540, (1815) so if your running it way down, you need to tune it on the dyno under 540,, but no lower than 400 on the pto speed and tune it to get the best results. Your tuning it on the wrong side of the rpm spectrum, where the high rpm is good for bigger, more powerful engines that can manitain the rpm, all your looking to do is enhance your low end pulling torque by tuning it for the lower rpms to make it live a little longer. It could go 2 inches farther, or 10 feet farther, depends on how much you can improve the low end torque curve. ChadS
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