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Tractor Pulling Discussion Forum

Alcohol in a tractor

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alcohol

05-18-2005 18:13:01




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i know that to run alcohol you need to put twice as much fuel to it. but my question is what sizes do you bore the carb out at and how big of fuel pump do you need? i'd like to get it right the first time and one of you guys have probably done it before. oh this is for a M. thanks for any input.




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ChadS

05-19-2005 08:42:00




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 Re: Alcohol in a tractor in reply to alcohol, 05-18-2005 18:13:01  
To give you an example from what I had to do when I put a Stock Super H on alky, the main jet was huge!!!! I eventually bored and tapped out the origianl main jet and replaced it with a holley jet that screws in. Then, using the biggest jet available,, bored it out about 9 more sizes larger. Then the metering stem was too small, tried the 6 cyl bowls, which has the big metering stem, no avail,, better, but not enough. Dad finally built his own stem out of an old torch tip widdled out on the lathe to fi the carb bowl. That worked perfectly, got lot of great power from that little C-164. Thats what I had to do to make a super H run on it. Hope this helps,,, ChadS

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laman

05-18-2005 19:27:08




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 Re: Alcohol in a tractor in reply to alcohol, 05-18-2005 18:13:01  
its not the bore of the carb, its the jetting. double the jet sizes and you will be fine. the bore of the carb has nothing to do with it.



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uh, no

05-19-2005 06:55:49




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 Re: Alcohol in a tractor in reply to laman, 05-18-2005 19:27:08  
if you double the hole size in the jet you will supply four (4) times as much gas



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la man

05-19-2005 21:11:26




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 Re: Alcohol in a tractor in reply to uh, no, 05-19-2005 06:55:49  
how so?



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la man

05-19-2005 21:15:49




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 Re: Alcohol in a tractor in reply to la man, 05-19-2005 21:11:26  
in 1/4" hole..... ..0.250" can go through.....in a 1/2" hole.....0.5" of fuel cna goe through it.....



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Drew

05-19-2005 21:22:45




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 Re: Alcohol in a tractor in reply to la man, 05-19-2005 21:15:49  
The cross sectional area of a 1/4 line would equal (using the pi x r^2 formula) .125x.125x3.1415=.049in^2
A 1/2 line would be: .25x.25*3.1415=.196in^2

.196/4=.049



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la man

05-20-2005 20:58:36




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 Re: Alcohol in a tractor in reply to Drew, 05-19-2005 21:22:45  
O....I see, i was thining literal.....double of 1/4 is a half. I didnt' do measuring on my carb, i just used a drill and put a hole in it and it worked. Will work on pure alcohol, or regular gas, its a good carb.



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buickanddeere

05-20-2005 08:07:13




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 Re: Alcohol in a tractor in reply to Drew, 05-19-2005 21:22:45  
Sounds like the carb bowl seat/needle/float was doing the fuel metering at wide open throttle instead of the main jet.



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