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Farmall & IHC Tractors Discussion Forum
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Upgrading H and M engines

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Charlie M

11-12-2006 08:39:24




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There has been some posts lately about upgrading H and M engines to super H and M engines. I'm wondering what is different on some of the mentioned parts. Things I'm wondering about include: Manifold, head - I'm assuming a super head gives more compression, and cam shaft - I thought these were just heavier shafts to handle a hydraulic pump. I'm thinking about removing the head on my M next year as I have a small fluid leak and its possible I may do a couple of things to get a bit more horse power.

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ChadS

11-12-2006 10:40:26




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 Re: Upgrading H and M engines in reply to Charlie M, 11-12-2006 08:39:24  
Whats really changed is the piston design in the rebuild kits sold today VS 20 years ago or waht came stock,,. Todays pistons can out do most of the M&W parts in some cases. As for bolt on parts, look for a 450 gas head, 450 cam, (same as the Super M grind) put in a stiffer governor spring, fix, or modify the mechanical advance in the distributor, so it works, or works faster, just some little things that can be done in a weekend that come monday,, you will have a more powerful tractor, that dont require alot of money. but th best money spent is in the head, and cam,,, well worth the money. JMHO ChadS

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riverbend

11-12-2006 10:13:11




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 Re: Upgrading H and M engines in reply to Charlie M, 11-12-2006 08:39:24  
A lot depends on where you are starting and where you want to go.

When I rebuilt the motor on my H, the biggest increase in compresion came from using a later model gasoline head. Domed pistons added a little too. Having the cam reground to a Super H spec added 0.040" lift ( up from 0.202").

Overall, the compression went from 4.5:1 to 6.25:1 (calculated). It made a big difference in the power output, it was enough that i could feel it. It was not so much that the motor was hard to crank.

Greg

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gene bender

11-12-2006 08:46:54




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 Re: Upgrading H and M engines in reply to Charlie M, 11-12-2006 08:39:24  
I would get on the pulling site as they know all the tricks.



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