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Tractor Pulling Discussion Forum

Re: carb help?

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LarryM

04-09-2013 18:37:52
76.210.62.93



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If you are pulling against me then I would agree that you should use a 27 venturi. :-) The guys who say use a 27 on a 281 cubic inch engine have never taken the time to actually test their hypothesis. I have plain jane C-281 with comformatic pistons that I am getting 69 hp at 540. I have a hybrid carb. The top is off a C-281 power unit and the bottom, the metering nozzle, and venturi are off a 301 combine engine. I gained 2 hp going from a 27 to a 33. I gained one more gong from a 33 to a 35. I do suspect that if I lug it down it will die off sooner with the bigger venturi but I want the horsepower at higher RPMs. If I am pulling and my engine lugs down because she ain’t got enough it is time to rethink some things. In the words of Sergeant Friday “just The Facts Ma’am; Just the Facts” All ideas are opinons until tested on a Dyno and opinons are like armpits; everyone has two and… well you can figure the rest out. Engineers Rule! Never under estimate the power of Geek! P.S. I have had few beers so if I come across as an A-Hole… Well I guess that means I am on the A-Team!

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