Can anyone tell me the differences of a 40 HP vs. later engines? I plan on rebuilding one and have some parts form later engine which I maybe be able to use.
I know the P&C's are smaller (77mm?), the heads would probably be different and the muffler.
What about the flywheel and clutch? Is it 6 or 12 volt? What carb should be used?
and whatever else...
tia,
Well, if it is a 40 HP case then you will have no barings on the camshaft. While the flywheel and clutch is 6V, so less contact surface (smaller clutch), you get to run a 6V starter at 12 V (if U are putting it into a converted 6V vehicle) which gets you a very fast crank to start! Basically, all the intake, output, etc stuff is different, so unless you put matched heads/intake/exhaust manifolds/muffler on it, you will have to go with 40 HP stuff. You could put a different distributor, generator/alternator, and fuel pump on it with no problems. I THINK that the oil pump is common with at least a few other engines.
I am sure that others will chime in with other details. KWW
Just wanted to comment that you can have the engine case machined to add camshaft bearings. This is a common thing to have done on a 40hp motor and one that I would recommend. You end up using the camshaft bearings normally used on the 1300 and 1500 cc engines. BTW, pistons and cylinders for the 1200cc engines are getting hard to find. Heard that the 83mm "big bore" cylinders that find the 1200cc cases are going away (don't know if there was more than on maker for these but at least one and perhaps the only maker is discontinuing them). I bought a set just to have in reserve. I have a '65 that I intend to restore to as close to stock condition as possible. Anyone know if you can still buy the stock 77mm cylinder/piston sets?
John Crichton kirjoitti:
if you do, make sure the machine shop also makes a new groove for oil to flow past the bearing shells, as machining the saddles for bearings just about wipes them out. Also add notches for the bearing tangs that prevent them from spinning. I had a customer bring me engine parts straight from the machine shop of his choice, and build me an engine... with no oil grooves. Good thing I caught that :) Some don't even bother machining the thrust bearing saddle to proper width.
Jan
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