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Tractor Pulling Discussion Forum

Question for WTW

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toot

10-19-2004 09:45:39




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What carb would be best to run on a 250+ cubic inch B. I have a DLTX 67, 18, 53, and 71 to choose from to put on. Would these carbs need any additional modifications for max horsepower. Bore is 5", stroke is 6.5", will be running electronic ignition. 1942 tractor, will be a low gear tractor in 3500 lbs.




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WTW

10-19-2004 14:00:22




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 Re: Question for WTW in reply to toot, 10-19-2004 09:45:39  
toot, My experience with my old 278 CID "B" is the best result was from a bone stock DLTX 67 from a late model GAS "B". You can go to big on a Carburetor as well as to small. With the size of engine we are talking about you will have good luck with the 67 carburetor as it will still lug under load, without stumbling. A carburetor to large will fall on it face under a heavy load because it will lean out because there is not enough air being displaced to keep the air velocity up to make the carburetor function as it is designed to do. This is a place, in my opinion when I tell folks bigger is not always better. I have learned that if you get over 300 cube that a late model "A" carburetor works well with the proper porting and matching but a "G' carburetor is to large. You need about 325 or more to really reap the benefits from a big nut "G". The size of the carburetor has to be matched to the displacement and the RPM that you are running / working the engine at. Our tractors always run between stock and 20% over depending on who's program we are attending. What works for some don't for others but this is what I have learned with the tractors we pull. Good Luck, DW

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