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Tractor Pulling Discussion Forum

turbo on 300 farmall

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john pye

05-05-2005 12:18:54




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i am putting a turbo on my 3oo farmall gas a to4 off a 301 allis, my question how much boost can you put on a updraft carb and it still work or do we need to put the carb on the intake side of the turbo, this is to run the 4000 lb open class




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Redman

05-05-2005 18:39:21




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 Re: turbo on 300 farmall in reply to john pye, 05-05-2005 12:18:54  
i believe you would want to pull it through the updraft.
i don't know how much boost to expect,but i would guell around 15 psi.



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farmall2

05-05-2005 14:19:09




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 Re: turbo on 300 farmall in reply to john pye, 05-05-2005 12:18:54  
If you are asking these questions you are in trouble. Good luck



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Buzzman72

05-06-2005 04:51:30




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 Re: turbo on 300 farmall in reply to farmall2, 05-05-2005 14:19:09  
Just in general, I would say that if you pressurize a carburetor that was never designed to be pressurized, you're inviting all kinds of trouble UNLESS you're experienced at that sort of thing. If you "draw through" the carb, you're just doing more of what the carb was initially designed for. However, I would guess that the maximum cfm rate of the stock carb would end up being a limiting factor on just how much help a turbo will be, in the horsepower department. Will the carb flow enough air--AND fuel--to make the turbo setup work? That's the question you'll have to answer, among others.

So what you're basically doing is putting a blower on a glorified H...while I understand the idea of "run what ya brung," somehow it seems that stepping up to a 350 block for a larger bore, plus any stroker options/LP head, etc., would be a more logical progression than just turbocharging a 300.

But if you do it, start off by thinking "larger carb" first, to handle more airflow...

Just my opinion.

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john 300 turboed up date

05-06-2005 05:17:04




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 Re: turbo on 300 farmall in reply to Buzzman72, 05-06-2005 04:51:30  
at 10 to 15 lb of boost it seems to work real good , at 20-22 lb it will scream for about 50 ft and die like we turned the switch off, (guessing it is blowing the float shut, we had the gov spring wired solid, to jmany rpms, we have slowed the motor down to 2900, it will run 12-15 lb of boost, will keep goin , today i am gona put a spray nozzel ,in front of the air wheel and put about 6 ounces of gas thru the turbo with a winsheild washer pump, were just playing, to me it makes more sence to put a 50 dollor junk yard turbo on than spend 7500 on a stroker motor, we planto hook it tomorrow at the soatpa at peebles ohio 4000- 5500- lfs

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Buzzman72

05-06-2005 06:49:30




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 Re: turbo on 300 farmall in reply to john 300 turboed up date, 05-06-2005 05:17:04  
I'm not crackin' on the idea of putting a turbo on one...sometimes ya gotta build what you have/"run what ya brung." Sounds like what I was saying about not getting enough fuel into her is coming true...at 20-22 lbs of boost, what I'd wager is happening is, you're using up all the fuel in the carb bowl before it can refill...might be time for either a bigger diameter fuel line, a bigger carb to handle the amount of fuel and air required, or maybe just a supplemental [electric?] fuel pump to keep the bowl of the carb full.

Keep us posted...sounds like a lotta fun!

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Tractorptsguy

05-06-2005 05:34:48




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 Re: turbo on 300 farmall in reply to john 300 turboed up date, 05-06-2005 05:17:04  
(Educated guess here)

You're on the right track with the added fuel. You will probably be able to increase the boost and rpm's proportionatly to the amt. of fuel you add. The rig was using up all the available fuel at the higher boost. This is why it would run 50 feet and then what we used to call "pop." I'm just surprised that you get that much boost w/ that large of a turbo and that small of an engine.

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