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JD A pulling tractor

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Bruce Flood

02-12-2001 14:34:15




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I have a 49 "A". I do pretty well at the pulls but, with the taller ratio of the 3spd hi/lo xmission (versus the newer 6spd), I need a little more low end, low RPM torque. I don't want to rebuild/modify engine.

Can I do anything with the fuel to gain that little bit more I need. 10% alcohol mix or something similar?

Any other ideas without an engine teardown?

Would appreciate the help.
Bruce

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G Taylor

02-14-2001 11:10:14




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 Re: JD A pulling tractor in reply to Bruce Flood, 02-12-2001 14:34:15  
If you mix nitromethane with gasoline power will increase. Nitro has a very low octane so high octane gas must be mixed. Nitro also requires higher fuel flow rates.



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Nruce

02-14-2001 11:20:12




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 Re: Re: JD A pulling tractor in reply to G Taylor , 02-14-2001 11:10:14  
Sounds worth trying. Would you suggest a mix ratio?
Thank you,
Bruce



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G Taylor

02-14-2001 20:31:55




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 Re: Re: Re: JD A pulling tractor in reply to Nruce, 02-14-2001 11:20:12  
Nitromethane is expensive so keep that in mind. Nitro alone requires approx 4 to 5 times the fuel flow of gasoline. Unless the entire fuel system has been opened up for extra flow probably 10 to 20% nito with 94 octane pump gas would be tops. Open the idle & main jets all the way. Make sure all the fuel screens are clean. The stuff is nasty, wear gloves & avoid the fumes. Just a much power avalable by installing a straight exhaust stack & a dry air filter conversion in the air cleaner.Then tweek the timimg & mixture while on a dyno at full RPM & when down to the last putt. If using nitro with those mods a 10% would be lots with the extra airflow.

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Bruce

02-15-2001 04:51:32




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 Re: Re: Re: Re: JD A pulling tractor in reply to G Taylor , 02-14-2001 20:31:55  
Thank you. When I get there I'll stick to the low percentage (10% or less). I've already converted to a dry air filter.

I've sent emails to both Klotzlube and Byronfuels to get their advise too. If I get anything interesting I'll forward it to you FYI. Bruce



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tractor man

02-13-2001 09:08:45




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 Re: JD A pulling tractor in reply to Bruce Flood, 02-12-2001 14:34:15  
bolt on a 70 fuel burner manifold should bolt on this will add dual carbration.



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WTW

02-12-2001 15:17:00




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 Re: JD A pulling tractor in reply to Bruce Flood, 02-12-2001 14:34:15  
Bruce, Here is an old trick that is not too hard to do or expensive if you have a local salvage yard handy. One of the differences other than the internal transmission gears between the 49 and the later creeper "A's" are the reduction gears. The late "A" (1950 and newer) with the creeper transmission have a different size clutch pulley and first reduction gear, They each are two teeth different than the your 49. Two teeth smaller on the pulley and two teeth larger on the reduction gear. This will gear you down some not as much as a whole late creeper transmission will but it will help and it easy to do. The later gears will fit and clear without any modifying. Here is what you have to watch out for and find. The clutch gear on all the later pulleys will fit your pulley. There was two different first reduction gears on the later "A's" . Both had the same outer gear but there were two different spiders inside them some had a keyway and some were a spleen just as you have on your 49. So when looking for this first reduction gear look for the one with the spleen. You may find either on any late "A" as I think one may have been a replacement for the other. This little power gain will only cost you the used gears, a gasket and the time to switch them. Good Luck Dave W.

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Bruce Flood

02-12-2001 15:37:06




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 Re: Re: JD A pulling tractor in reply to WTW, 02-12-2001 15:17:00  
WOW! This sounds like dynamite! Might give me just what I need!
Thanks a million Dave W.
Bruce
PS: Our pulling club is at Link



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burns

02-12-2001 14:54:18




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 Re: JD A pulling tractor in reply to Bruce Flood, 02-12-2001 14:34:15  
I would stay away from the mixture of gas mentioned. Run the fuel with a lower octane provided it doesn't sputter and knock on you. I lost 3-4 dynoed hp on my G by running 115 octane when I didn't have the engine designed for the high octane stuff. Now that I have a high compression engine, I won't be able to run anything but the good (expensive) juice. I pull a 48 A with the same tranny. I pull the lower classes 4500#-5500# with a high rpm and do very well.

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Bruce Flood

02-12-2001 15:30:37




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 Re: Re: JD A pulling tractor in reply to burns, 02-12-2001 14:54:18  
Mr. Burns, I thank you for replying. I agree with the lower octane. I've tried higher
octanes and boosters a couple of times and always
lost power. I thought the alcohol might be longer burning for low RPM power but don't really know.
We mostly pull a static sled ("stone boat") for a 6 foot full pull. This requires pulling down to the lowest RPM to maintain traction.
FYI, we pull in CT, RI & MA. (see:http://www.nebsnow.com/antiquetractors)
Good Luck this year!
regards, Bruce

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