Pondering on taking apart 2 running engines to swap out the side cover,cam and crank.
I have a HM80 on my MTD built 8/24 snowblower with 11" impeller that runs fine but has a worn valve guide. It uses oil, not horribly much but I do have to keep an eye on it and add some once in a while. It blows wet snow,dry snow,slush and doesn't clog up. It's smaller size makes it more maneuverable and being built by MTD parts are plentiful and cheap.
I have a larger Noma (Murray built) 10/29 snowblower with HM100 engine. The engine runs smooth and strong. It's a horribly designed blower IMO. The hole for the chute is just slightly larger than a 2x4 and it has a smaller 8" impeller. It clogs up constantly and the gear box has quite a bit of slop in it. It's a big heavy worthless turd because we get nothing BUT wet sticky snow and lots of slush. Parts for it are pretty hard to find and quite expencive.
I would like to put the HM100 on the MTD built blower.
The HM80 has 2 output shafts and 3 belts. 2 belts run off of the crank and 1 off of the Camshaft. The HM100 just has 2 belts that run off of the crank.
The outside crank diameters are different as well.
My question is, will the HM80 Crankshaft,Camshaft and timing cover work in/on the HM100 block? The blocks look identical on the outside. I know that both engines use a bunch of the same parts on them.Carbs,flywheel,coil,Blower housing ect. Is the bore size the only difference between the 2? Or are the crankshafts also different?
I would like to put the better of the 2 engines on the better blower and use the 8hp on my big belt drive pressure washer that currently has an old 5hp briggs powering it. Then I can finally turn the pressure up a bit. The pump is rated @ 4,500 PSI but I can only run it around 1800psi with the old smokey but usually very reliable 5hp Briggs flat head without stalling it.