Cub Rumor?

holmesw · Mar 2, 2011

Hello all. A few months ago my Dad and I were at an auction where they were selling two farmall cubs. We got to talking to one other person there and he said that he had a cub. As we got to talking he said that the cubs cylinders could not be sleeved. I have personally never heard of an engine that could not be over bored and sleeved. Have any of you heard this rumor? Have any of you overbored and sleeved a cub? Thanks in advance.

sflem849 · Mar 2, 2011

To the best of my knowledge that is correct. I am more of a big tractor fan, but I have heard before that there are no sleeves in a Cub. That is what makes their engines (and good runners) so valuable.

billde · Mar 2, 2011

The C 60 is a sleeveless engine, You could have it bored but you would also have to have sleeves made. Far cheaper to just get another block. The C301 was sleeveless as well.

El Toro · Mar 2, 2011

The Cub engines never had sleeves, but if the block is worn too much your local auto machine shop can probably get sleeves. L.A. Sleeve can probably make them. Hal

sflem849 · Mar 2, 2011

(quoted from post at 09:34:29 03/02/11) The C 60 is a sleeveless engine, You could have it bored but you would also have to have sleeves made. Far cheaper to just get another block. The C301 was sleeveless as well.

Where was the 301 used?

Ron W · Mar 2, 2011

I have rebuild several cub engines, std, .010, .040, .060; they were all sleeveless. Make sure you bore them out enough to get clean walls. In 1978 we had our mowing cub bored out; it bearly cleaned up at .010. We put in domed piston and only got five years befoe the blow by was so bad as the tractor couldn't climb up the hill. About 14 years ago I got a price of $600 to bore a cubengine to +.125 dia and sleeve them back to standard. I found another block. If you can, get high altitude pistons/domed/firecrackers, they make a BIG difference in power as the Cub has a 7:1 COMPRESSION RATIO as standard.

billde · Mar 2, 2011

806 gas

Ron W · Mar 2, 2011

BTW, as the f-12 engine (pre-WWII technology) was an upgrade to the Farmall Regular/10-20/15-30/w-30/f-20/f30 engine (WWI technology), so was the cub engine to the f-12/a/b/c/h/m/w-4,6,9 series. The cub engine is very efficient with the highest combustion ratio over it's predecessors. I mow 3 acres using a 5ft belly mower and burn a little over a gallon.

mkirsch · Mar 2, 2011

At .060 over, there isn't enough "meat" left in the block for further boring.

To sleeve it back to original bore, the sleeve walls would only be .030 thick. Good luck getting a press fit on something that thin.

teddy52food · Mar 2, 2011

Replacement sleeves are thicker (smaller ID), then need to be bored to standard after being pressed in.

Cub Rumor?

holmesw

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sflem849

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billde

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El Toro

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sflem849

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Ron W

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billde

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Ron W

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mkirsch

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teddy52food

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