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Minneapolis Moline Tractors Discussion Forum
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Crazy thought of rebuilding a MM engine.

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ROWDY33

02-17-2008 16:04:57




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I noticed that engine kits are pricey if available and no one knows much about them other than what the book says. All I can find (that is on the web)is standard bore and +.40 over. I can't even find a sleeve kit. This also includes NAPA.

The thought:

The 206 engine has a 3.625 standard bore. I'm sure I can find an automotive piston around that size that are massively produced and better priced. The hard and pricey part would be to custom build connecting rods to fit the auto piston and the MM crank. I know building rods are not cheap eather.

Some questions for you guys that know every inch of MM engines: Using a 206 engine for now (my engine).

-What's the Max overbore that the sleeves can handle?
-What's the max compression that these engines can handle without too much wear and that a 12 volt starter and a 500cca battery can handle? -What is the crankshaft journal diameter?
-Has anyone ever done something like this that I'm looking into?

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LW

02-17-2008 18:33:35




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 Re: Crazy thought of rebuilding a MM engine. in reply to ROWDY33, 02-17-2008 16:04:57  
A nice set of custom forged pistons will cost about 60% of what a set of rods will cost to make.



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ROWDY33

02-17-2008 17:00:35




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 Re: Crazy thought of rebuilding a MM engine. in reply to ROWDY33, 02-17-2008 16:04:57  
1959 445 over heat valve and cam. I forgot about that.



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rpllr

02-17-2008 16:25:05




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 Re: Crazy thought of rebuilding a MM engine. in reply to ROWDY33, 02-17-2008 16:04:57  
First the cylinders are not sleeved on a moline,and second it depends on witch 206 you are talking about. The side valve enging is more limited than the overhead valve 206 engine. If you have an overhead valve engine you can probably find an ovrebore piston. You might be able to bore it to a 3.750 and use the 302 pistons. An automotive piston is hard to match up and the rods would be expensive to make. Might be cheaper to find a good set of used blocks. I have had both the overhead and side valve engines bored and used auto pistons but they were custom made.

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Clint Youse MO

02-17-2008 16:17:42




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 Re: Crazy thought of rebuilding a MM engine. in reply to ROWDY33, 02-17-2008 16:04:57  
What is the 206 out of the ones on the Z had different parts and a blind hole jug and the ones on the later tractors had regular jugs I believe they had different cranks and other parts



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