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Minneapolis Moline Tractors Discussion Forum
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Z Minneapolis

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Joel H

09-14-2003 13:10:35




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I recently bought a 1951 Z mm. It wasn't running when I bought it. When I got it running I found it had low oil pressure , with a slight knock in the engine. I suspect it might be a rod bearing so I'm going to have to go into the engine to fix it. So I was wondering, while I have the engine apart, if there is any changes I can make to increase the horsepower. I would like to do a little antique tractor pulling with it and use it around the farm. Any later MM tractors that use this engine that might have had more horsepower or more cubic inch? I was at the MM show at Lennox, SD. this year and saw an interesting display of this engine with a cut away view of the engine and quite a few different heads. I was wondering if there is a particular head number that would be appropriate for what I want to do. Thanks for any advise.

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John G

09-14-2003 20:54:18




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 Re: Z Minneapolis in reply to Joel H, 09-14-2003 13:10:35  
Joel, The display you saw was mine, I'd use the RE226C head, because it will allow enough compression. Seems that if you are pulling in the stock rpm and horsepower classes, the higher compression heads like the LP ones will give more at stock rpm, but fall on their face when lugging down which the MM engines do realy well. The LP heads casting #s are 10A2647 & 10A2648, they each have 2 frost plugs whereas the others have only one. "easy ID" The engine you have is the 206, 3 crankshaft main bearings. That's the largest stock size, although increase the bore to 3 3/4" & you have a 220. I've seen a 206 / 3 7/8" bore, but they had to go thru a couple of blocks to get one that would bore that big & not blast away the cylinder wall on the 1st pull. Hope this helps.

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Mark H.

10-02-2003 10:02:04




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 Re: Re: Z Minneapolis in reply to John G, 09-14-2003 20:54:18  
John G,I also just bought a 1951 ZAU. I have this head part number, You said in your post that you can get 220 ci with no problem. The question I have is is there a piston that can up my compression? I am restoring my tractor for pulling and a prade now and then Thanks Mark H.



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