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Farmall M 1946 pistons

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Paul Mockenstur

12-04-2007 19:54:27

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I have a Farmall M 1946 serial #122648 . I am going to rebuild the engine and if there is a differance between fire crater and stephead pistons ? Will one give more compression than the other ? I have heard of several manufacturers , high capacity , red power , seal power , tisco , true power ,and fire power . I am looking for a reccommendation . 719 783 3339

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ChadS

12-08-2007 06:35:36

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Re: Farmall M 1946 pistons in reply to Jeff Oliver, 12-04-2007 19:54:27

Ben Rauls said: (quoted from post at 20:50:53 12/07/07) Take the sleeves out, 4.1/8 will drop in

I agree, that is a good route,, because, this can be done as an inframe overhaul if you have a sleeve puller. Have rings made to fill in the flange counter bore, use a 450 head gasket, and as long as the flange rings seat correctly and not rub or hit the pistons, (and they usually dont) Clean the cyl walls by a hone, and check the side clearence on the piston/cyl wall. Just like the automotive engines that the pistons run on the block,, if you maintain em regularly, they will last for a very long time! I like sleeves, makes em renewable. last forever as long as it stays manitained. ChadS

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ChadS

12-07-2007 15:18:35

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Re: Farmall M 1946 pistons in reply to Paul Mockensturm, 12-04-2007 19:54:27

Pull the water plate off the carb side of the block,,,, if it looks like its deteriorating by large flakes of rust chipping off the outside of the block bores, its not a good canidate. But say that its good, your gonna bore the block to 4.25 (or to the sleeve spec) The top flange on the 450 is larger, but can be fitted into the top of the M block. All Ms at one point ant time were 3-7/8 bore (248ci) If its flaky rusty inside the water jackets, you have more risk of block failing. Usually in number 3 cyl (on rusty blocks) at the lower area of the water jackets,, where the rust all sits at the bottom is where it will be leary,,, but have had very good luck with good blocks with the 450 sleeves in the M blocks. The 450 pistons,, well the head chamber is different,,, if you ever have seen an 8060 and a 450 gas head up close, you will see on the 450 head, (onthe manifold side) will have a slanted edge casted along the side of the chamber,,,, if you use the 450 piston, and the 8060 head, simply take a hand grinder and install the slanted edge, just like the 450 head has and you will be fine. My engine, runs a 450 piston, with the 8060 head,,, had to grind the slant, and still had 70+ hp,,, best if a 450 head is used, then the cyl pressure will be higher yet,, and with a 450 camshaft, firecrater pistons will work better VS everything used except the cam and head.
All comes down to your block condition,,, if its good, you have nothing to fear putting in 450 sleeves. Ps, your block wit hthe sleeves pulled is 4.125 roughly,,,, another option is to run the pistons on the block, have a ring made to fill in the flange gap and run it that way,, but I like having sleeves in a small bore engine,,, for the option, it gives it longivity to have the sleeves. 574-893-7437, or 574-893-4230 or chads3@hotmail.com. ChadS

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ChadS

12-06-2007 09:00:16

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Re: Farmall M 1946 pistons in reply to Paul Mockensturm, 12-04-2007 19:54:27

A 450 kit in the M block is best option,, makes a 281ci out of it. Lots of options after that point to make good power.

Best advice is to make a Super/450 internally,,, when the SM came out with the 264 block, allowing the 4.125 overbore, you seen a change in the entire engine design, Bigger displacement, higher compression ratios, different styles of pistons, etc etc. But standard, you seen more of the options, factory upgraded parts more in the 400-450 C264 and C-281 engines. Upgraded parts start at the Super M,,,, the block was able to go to 281 ci by swapping the sleeves, also firecraters were really gaining popularity, and you started seeing more SMTA's with firecraters, some were ordered that way, most were dealer conversions,,, but alot of the 400-450s I have been into have had firecrater pistons. But anyways,, another upgrade was the cam grind,,,, they did change it in the SM,, some argue as to when it came out,, but the more popular phrase for the cam is the 450 cam. Ive seen this 450 cam grind in SM's as early as serial number 5000, with the right handed nut,, I took one out and had it checked, or read to see what it was exactly, and sure enough,,, compared to the M, it was not the same grind. But mostly common in the 400-450 tractors. Carbs changed design as well when the 400 came out,,, and the governor changed just a bit,,, either carb will work fine, but you have to build the older carbs to match up to the newer carbs,, Hope this helps open up a door,,, as they got newer, they upgraded and upgraded, but everything can be done to a M with a little work, and what a tractor it makes out of the ol M!!!!! I know, I got one! LOL!! 70+ hp on 87 octane pump gas with a 8060 head. ChadS Email is ChadS3@hotmail.com

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Paul Mockensturm

12-07-2007 12:18:27

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Re: Farmall M 1946 pistons in reply to ChadS, 12-06-2007 09:00:16

Chad S. I have the early M originally 3 7/8'' pistons , as I understand it, to go to the 450 kit 4 1/8 '' I would have to have the block bored to execpt the larger piston sleves including a step bore for the top of the sleve . How big of a gamble is this posibily getting into the water jackets ? Could I use my existing head or would it not work with fire crater pistons ? If you would give me your phone# and a good time to call I will call you at your convenience .719 783-3339

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Ben Rauls

12-07-2007 19:50:53

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Re: Farmall M 1946 pistons in reply to Paul Mockensturm, 12-07-2007 12:18:27

Take the sleeves out, 4.1/8 will drop in

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