The Craftmans Shop > Model Engineering

Side Valve i.c. engine from Bar stock

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Brian Rupnow:
This is a very good example of engine size comparisons. The engine on the left is patterned after the Nemett Jagauar, an engine having a 7/8" bore and a 3" diameter flywheel. The engine on the right is my new side valve engine with a 1" bore and a 7" diameter flywheel.  The basic engines are very close to the same size. The new engine with the large flywheel has to have the support angle feet extended a long ways so the bottom of the flywheel will clear the table. Of course, I had to add a belt driven fan to the Nemett engine to get it to run cool enough, so it was extra work to make the fan, fan housing, blade, shaft, bushings, etcetera. I like the proportions of the Nemett engine a lot better.--Decisions--decisions---

tom osselton:
Somewhere on this site there is a pic of a flywheel offset and driven from a belt on the crank that would seperate the two making it look more pleasing.

Brian Rupnow:
As I have said before, I plan on using "sealed" roller (not ball) bearings on both ends of the con rod and "sealed' ball bearings on the load bearing side of the crankshaft. That is why the crank is split into two halves. Since the bearings are filled with grease and "sealed" I shouldn't have to lubricate the rod nor the crankshaft bearings. The more I look at it, the uglier it gets with that big flywheel on it.--I'm not too concerned about the airflow---the airflow hitting against the side of the crankcase will be forced out to the sides and "up and over" the cooling fins. I think I will probably go with a 4" diameter flywheel and a separate fan setting above it. That simplifies the flywheel by an order of magnitude, and I can probably utilize the computer fan/propeller that I bought for the Jaguar and then didn't use, driving it with an o-ring drive belt.--That will also direct more of the air across the cylinder and head.

vtsteam:
Hmmm, I wouldn't want to get my finger caught in a flywheel either.

Brian Rupnow:
I have a few minor logistics to figure out yet, but here is the engine with a 4" diameter flywheel and the 2 15/16" diameter computer fan I bought for a previous engine and then didn't use. As far as I'm concerned, this is a really big improvement over the 7" flywheel/fan.

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