M18 and M22 same block?
 

I got talking to my wife's cousin about his 1811 engine woes and said that he heard that the M18 and M22 shared the same block. If it does he would like to have his M18 to the M22 size and put that back into his 1811. If the block is the same what about the crank would he have to replace that if it can be bored to the M22 size? Anything else he would have problems with or should look out for?

Thanks for your help!

There is no M22. Just M18 and M20 and a bunch of other vertical shaft models.

I'm pretty sure the M18 and M20 have a different bore and stroke. I would not count on the jugs being the same casting, either. About the only thing that wouldn't have to be changed is the case halves.

If you want to know what is different, go to the parts lookup and compare engine part numbers for the 1872 and 2072, as the former has an M18 and the latter an M20.

Thanks Matt! He's looking at a newer command 24 hp and I can't figure out why he just don't rebuild the M18 besides needing more power for his snow blower. The guy selling the 24hp wants $700 for the engine and says he has everything to make it a bolt in job. I told him that he could have his M18 rebuilt and have some $$$ left over. His only complaint is he says his snow blower seem to bog the M18 engine down so that's why he was looking for more HP.

There was a 22 or 23 hp, k532, flat twin engine, that was used in some deers and skid steers. It was a Kohler motor, but it was all cast iron. And it is completely different from the m18-20.

From what I have read on some pulling sites the m-18 and m-20 are the same except the crank and pistons. According to them the m-20 has a longer stroke with shorter pistons. They were putting the m-20 crank and pistons in the m-18 blocks to make more power. I think they had an 18 hp rule. I wish I could find that site again.

And I don't think the 24 hp vtwin will have any more working torque than the m-18 or 20. If he does settle for the rebuild of the m-18, he can apply most of the methods that are in the killer Kohler build to it except the cam of course. Then he would have a real nice running m-18 and should have all the power he would need.

Thanks for the info jbollis! I've got some looking up to do for this project.