The blower is 5' wide.
Here is the first picture, not the best as my cell phone was dying and I couldn't use the flash. It's belt driven to a carrier shaft. That shaft is chain driven to the snowblower itself.
I was having two main issues:
1) it was throwing the belts. I *think* I have it resolved now.
2) It is not throwing snow very far. This could be an RPM issue. ( I just painted the chute and I'm looking for belting to bolt to the second stage wheel to assist in throwing the snow.
The rated top speed on that engine is 3600 RPM. To gear it down I went with a ~3" pulley on the engine and a 6.45" pulley on the carrier shaft. That gives me about 1646. Then I used a 10 tooth sprocket on the carrier shaft and a 30 tooth on the blower itself. That gave me an estimated 548 RPM on the blower.
I took a measurement this afternoon and the blower sprocket is turning at about 500 RPM. This isn't too surprising as the engine probably isn't running at a full 3600 rpm and the pulleys sizes were based on what I could find available. In most cases 40 RPM isn't a big deal, but I need to recover that in order to get the speed up.
I'll see what other pulleys I can find and adjust accordingly.
To summarize, it works. Its works better now than it did before as I have much more power and the motor doesn't bog down like it did last year. The downside, at this point, is not having enough speed to throw the snow. I haven't used it since painting the chute. I'll post updated when I get them
