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Tractor Pulling Discussion Forum

Carb-Venturi

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ted

08-22-2003 18:38:52

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I am experimenting with an "M" Farmall carb to put on a Super M for stock pulling. I have drilled the main fuel jet and I know I need more air, what diameter should I widen the venturi to? I was light on the main fuel jet I thought I could test it a few times.

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ATHYRIN

08-25-2003 10:49:24

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Re: Carb-Venturi in reply to ted, 08-22-2003 18:38:52

Drill it out to 1.0" to start with. That should be about right for a SM. Drill the main jet out to .093 (3/32) or bigger. You can always turn the fuel screw in to lean it out.

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ChadS

08-31-2003 16:26:47

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Re: Re: Carb-Venturi in reply to ATHYRIN, 08-25-2003 10:49:24

I don't mean to start anything, but I tried that this morning, the 806 venturi worked the best this time. I started with a SH venturi, and bored it out, could not get the flow right. I think the flow was wrong. But, the .093 jet was close. Like I said, I don't want to start a war again, just wanted to tell you that part of your advice was correct. ChadS

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Ted

08-26-2003 04:59:10

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Re: Re: Carb-Venturi in reply to ATHYRIN, 08-25-2003 10:49:24

Thank You ATHYRIN for the input. I almost gave up after the last discouraging response. I had the venturi "chucked up" in my lathe waiting and I am going to bore it to 1 inch.

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MAXONEPULLER

08-23-2003 20:51:19

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Re: Carb-Venturi in reply to ted, 08-22-2003 18:38:52

Well,,first of all if you don't know what your doing,, all you will do is make junk out of your carb!,,yes drill out the jet to the next size is OK<

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Ted

08-24-2003 05:04:59

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Re: Re: Carb-Venturi in reply to MAXONEPULLER, 08-23-2003 20:51:19

Thanx

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