Quote:
Originally Posted by McInturff Racing
I just switched from compacts to mini sprints this year and the learning curve has been a bit steep and I'm hoping you fine folks can give me some direction. Right now I am having an issue with a HUGE flat spot in the middle of my rev range on my '02 R6 on modified Odum carbs. Carbs were just cleaned, adjusted and balanced by Odum, I am running the 3# fuel pressure that he told me to run (float jets were drilled out and replaced by a screw in type that runs 3# as opposed to his usual 5#), new plugs, new alcohol resistant fuel pump rated at 130 GPH, new fuel pressure regulator, clean filters. Fuel system is set up as a deadhead. The engine does this under load and at idle, but once I get past it the engine runs great. I'm not sure what adjustments I should be trying to make to eliminate this or if I should just bite the bullet and have my engine dynoed. The only problem I have with the idea of a dyno test is that I do not know anywhere near me that is set up to do a mini (I'm in Troy, Ohio half an hour north of Dayton). Any suggestions to help steer me in the right direction would be greatly appreciated!
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I may get you into more trouble, than you're already in, but there are a few things about your set up that bother me. With that much of a fuel pump, I doubt the regulator will do any good, I've had it with reg's, first thing I'd do would be either buy a pill holder bypass, or make one, but you need to regulate the fuel some other way, I've seen all kinds of methods used, but you'll need to run a -6 line back to the tank, and put your bypass in there, just before it enters the tank. My first one, I just drilled the fitting, so a pill would slide in, and then had to fish it out, but it was an improvement. My initial adjustment was to turn on the pump, with the bypass hose in a gallon jug, and chg things till I got 3/4 of a gal a minute, and that was all I needed, I've seen setups, where they had a hose clamp on the hose, and just "trim" it out, till it ran right, but a pill holder is handy, Kinsler's QC is too, but, it can be as simple as a hose clamp on the return line. I'd get rid of the regulator, I've never seen one that would work at that low of pressure, everytime, and, I've never seen a "dead head" system that worked right everytime, plus, it draws down your battery, and heats the pump. Good luck! There is a place in Indy, that for a hundred an hr, will help you tune it, if that's the last resort. Bob
