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#1
09-04-2010, 11:49 AM
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Re: *gear reduction unit
Joe, thanks. I went back and re-did my calculations. I removed the trans cover and counted teeth on the spur gear as well as the belt drive reduction. Here are my findings, assuming I stick with the 3:1 axles.
1st gear final drive ratio is 66.87:1 2nd gear final drive ratio is 33.3:1 3rd gear final drive ratio is 16.65:1 Just for grins, I also calculated the actual mph in each gear. Had to see what kind of ground this truck would cover. One revolution of the tires covers 9" or .75 feet. Running a 6,000 RPM motor, 1st gear is good for .75 mph. 2nd, 1.5 mph. 3rd, 3 mph. Hub speed is 89 RPM in 1st, 180 RPM in 2nd, and 360 RPM in 3rd. Looks like a Novak on 12 volts would need a 16:1 planetary and 4:1 Rust axles to come out somewhere between the stock driveline's 2nd and 3rd gear speeds. About 1.8 mph. Or with a 20:1 planetary and 4:1 axles, I'd be getting about 1.45 mph. A little under 2nd gear speeds. If I stick with Wedico axles 3:1, a 20:1 planetary will give me about 1.9 mph. 16:1 planetary and 3:1 axles gives about 2.4 mph. That looks much better!
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Nathan Last edited by Espeefan; 09-04-2010 at 12:48 PM. 
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#2
09-04-2010, 12:11 PM
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Re: *gear reduction unit
WOW..... You guys are way beyond my scope of intensity when it comes to figure gearing. Reading all these responses, I would think we're trying to decipher Einstein's theory of Realitivity
 
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Rick.--- I suffer from Wedicosis ------------- My other truck is a Komatsu To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
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