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Tractor Pulling Discussion Forum

Cutting the fat off M-M R

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Mopower

05-11-2004 06:01:21




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I'm attempting to build a very very light M-M R. It is a 1939 and I have eliminated all the extras. Before I go hardcore in to gutting this machine, how light can a fella get an R? I saw a 3000 pound 1952 R once. I think it could have been made even lighter. Plenty of ideas here, just after a good target weight. 2750#? I suppose 2500 is out of the question.




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Ryan

05-11-2004 10:08:55




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 Re: Cutting the fat off M-M R in reply to Mopower, 05-11-2004 06:01:21  
Someone once told me that there was a difference between the rearends early vs. late. I think the late ones were built stronger. There is an R out there floating around with a 445 engine in it. I know there are starter motor/flywheel issues but the tractor was very light (push around with one hand).

Ryan



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Mopower

05-11-2004 10:49:47




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 Re: Re: Cutting the fat off M-M R in reply to Ryan, 05-11-2004 10:08:55  
Yeah, I think the older trannys are lighter. My tranny is a 1947 though. The Jet Star engines go in pretty well I hear. I knew a fella that had a ZB like that. I also heard of a guy that split his R tranny in 4500 class! It would be a hot machine huh! My next try may be a U302/JT.



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Andy

05-11-2004 14:39:13




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 Re: Re: Re: Cutting the fat off M-M R in reply to Mopower, 05-11-2004 10:49:47  
I've heard of R's shearing pinion gear bolts. You might want to replace them with GR 8



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Augie

05-11-2004 09:52:55




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 Re: Cutting the fat off M-M R in reply to Mopower, 05-11-2004 06:01:21  
I know of a guy who pulls his R at 2750lbs. Not sure what all he had to do to get it that light, but I wouldn't think it would be too hard to do.

I'm putting one together now. Hoping to have it ready to go by the end of this month.



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ChadS

05-11-2004 06:47:12




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 Re: Cutting the fat off M-M R in reply to Mopower, 05-11-2004 06:01:21  
I can get my Z down to 3750, and still has the hubs, and hyd pump, and tank. I would say that it may be possible to get close to 3200 with a Z, mine is a 52, the 39 models are unstyled?? Chad



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Sounds right ChadS

05-11-2004 07:55:01




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 Re: Re: Cutting the fat off M-M R in reply to ChadS, 05-11-2004 06:47:12  
I saw an early red-nosed ZT run in 3500 called "skinny minny". Those were made from about 1937 to 1947 before the ZA came out. The unstyled was a Twin City JT (with waukesha motor) in the mid-thirties although there are unstyled ZT prototypes out there. I hope to have my JT at 3500. An R tranny is much smaller than a Z, but still much more iron in the middle than a VAC Case, Allis B, or Farmall C. I would love to compete with those models. Small block M-M has potential I think. We'll see. You ought to build a M-M ChadS. You seem to know your stuff! You lighten up a few machines? Mostly IH?

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ChadS

05-11-2004 08:42:56




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 Re: Re: Re: Cutting the fat off M-M R in reply to Sounds right ChadS, 05-11-2004 07:55:01  
I work on all the colors. Yes, mostly IH, But every once in a while, some other colors come in too. I don't mind, aint prejudice! LOL!! I agree with you, I do think these small block MM have great potential, I like this Z very much, the intake manifold is up on top of the engine, and has a long intake to let it take a good breath! I have not looked into building this engine as for a stroker,, I went through the carb, governor, and the ignition, and dyno tuned it. it has 42-43 hp. Also has the 206 in it too. It is a pretty spunky little tractor, but I just cant make a puller out of this one, not like I built the H's, It is just a nice little tractor, div 1 puller if that. Like I said before, it is nice to have a good runnin tractor around to use around here, and has that classic MM sound out the pipe! Deafening!!! LOL!! Have seen some strokers in these tractors a few years ago in our club, they were very tough, and now that I think about it, it was a JTC, old grey twin city, unstyled. He could get down to 3300 with it, and give those WC allis a run! Chad

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Here's a sidenote

05-11-2004 09:10:12




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 Re: Re: Re: Re: Cutting the fat off M-M R in reply to ChadS, 05-11-2004 08:42:56  
Ok Chad. I know the H motors have potential. The Z motors would be tough to build big because of the set-up. Just to drop you a hint. Look at a M-M 445 or Jet Star. There was a big variety of those engines. Bolt patterns are the same and dimensions were similar but.....OHV. Dozens of heads. Very very peppy governor and there were som big blocks that fit on them. 206...220...and a 236 diesel block at 3.875 bore. These all bolt right in and I think could possibly spank an H or WC. Interchangeability is great! So now you understand my mission! My R tractor though is the regular sideways valve type. Not too wild.

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ChadS

05-13-2004 08:22:13




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 Re: Re: Re: Re: Re: Cutting the fat off M-M R in reply to Here's a sidenote, 05-11-2004 09:10:12  
Other than the Z I have, the last time I seen one pull was 2001 down in Hartford KY. It was a red nosed grille. He was doing great against the WC's and the H's. Also, these tractors would be so easy to balance, They are shorter in wheel base than an H, Some times, if I stare at the Z for a while, looks just like a U! LOL Wanna see a pic of my ZAU? ChadS



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Mopower

05-13-2004 16:17:00




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 Re: Re: Re: Re: Re: Re: Cutting the fat off M-M R in reply to ChadS, 05-13-2004 08:22:13  
Show me!!!!! !!!



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Solid Junk

05-12-2004 20:11:22




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 Re: Re: Re: Re: Re: Cutting the fat off M-M R in reply to Here's a sidenote, 05-11-2004 09:10:12  
I would like to find a rod that had a 1" pin holes, a 2 to 2.5" rod hole, and about 12" length ..... .you figure out the rest.

Joe



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