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Tractor Pulling Discussion Forum

Farmall M Engine Build

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46mpuller

11-27-2012 07:50:35




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looking to build my stock m into a good 3-6mph tractor wondering what size engine would be the best and what it takes to have a m compete and win at 6 mph




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LCB

11-28-2012 09:05:14




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 Re: Farmall M Engine Build in reply to 46mpuller, 11-27-2012 07:50:35  
I know of serval 500 cui Ms at 4&6MPH that do very well with 18.4X38 tires.



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46mpuller

11-27-2012 22:19:52




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 Re: Farmall M Engine Build in reply to 46mpuller, 11-27-2012 07:50:35  
what will be the difference in price between 436 and somewhere in the 500 range



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bp4455

11-29-2012 13:12:59




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 Re: Farmall M Engine Build in reply to 46mpuller, 11-27-2012 22:19:52  
ill give you a hint. just THE BLOCK prepped for 500+ motors. is in the $4500 range.



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north puller

11-28-2012 05:06:18




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 Re: Farmall M Engine Build in reply to 46mpuller, 11-27-2012 22:19:52  
Don't know for sure, but it will be a lot. 436 is an overbore in the block and a welded crank. Any bigger requires welded in sleeves and a billit 8" crank. Gonna be a LOT more money.



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north puller

11-27-2012 19:34:26




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 Re: Farmall M Engine Build in reply to 46mpuller, 11-27-2012 07:50:35  
I've never played at that level, but 18.4-38 full cuts at 6500lb at 6mph is serious. I don't think 500 cubes will be enough to win.

Look at who you will be competing against. Another guy like you who asked the same question: what do I need to win? A 409, 421 or a 436 aint gonna cut it. The little tire 4mph guys all have those.

I would think that you need to be in the high 500's or near 600 cubes and over 150 HP. You are getting up with the very big boys with those tires and that speed.

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dboll

11-27-2012 15:42:28




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 Re: Farmall M Engine Build in reply to 46mpuller, 11-27-2012 07:50:35  
450-500 ci minimum on a good track and a short chain



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A.P.

11-27-2012 13:02:28




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 Re: Farmall M Engine Build in reply to 46mpuller, 11-27-2012 07:50:35  
What weight classes? What are your tire rules - size and full cut/top cut/road worn?



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46mpuller

11-27-2012 14:57:43




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 Re: Farmall M Engine Build in reply to A.P., 11-27-2012 13:02:28  
want to run 4500-6500lbs weight classes and would like to be able to turn 18.4-38 full cuts



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LarryM

11-27-2012 18:23:15




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 Re: Farmall M Engine Build in reply to 46mpuller, 11-27-2012 14:57:43  
6mph in 6500? Sounds like a five figure project to me. I have to get my house paid for before I play at that level.



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A.P.

11-27-2012 17:36:12




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 Re: Farmall M Engine Build in reply to 46mpuller, 11-27-2012 14:57:43  
On a biting clay track with a short chain sled at 6500# I would shoot for 500 cubes or a bit more. Are you going to try and build the engine yourself of farm it or portions of it out? If you are using a builder you should discuss your needs with them for the most cost effective and durable combinations.



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bp4455

11-27-2012 10:00:40




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 Re: Farmall M Engine Build in reply to 46mpuller, 11-27-2012 07:50:35  
i would say 4.375x7= 421 cubes or a 4.375x7.25=436,unless you can run high rpms.



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