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Lots of figuring out. Engine rpm of 3600 down to track sprocket That rpm with the circumference gives inches per min, calculated to ft per min, to mph
This man knows best, I built mine from an old snowmobile chassis and I’ve got 5 sprockets in a box to show its trial and error/ figuring out.
Hey Bender, Your in Canada right? Have you had any interactions with the law? Any issues? And are you always helmeted?
Just got back from a 4 day trip up north where there was still a decent amount of snow on the lake the first day, but nearing 40F temps on end of day 1 into 2 created slushy conditions. What I learned from the trip. Just me with minimal gear and hard crusty snow, the sled had no problem getting to full RPM and full speed. With the snow pockets/ slush and more gear that I hauled for the rest of the group, it could not get to full speed. It just didn't have the power to get to full RPM and highest gear ratio. Day 3 the temps dropped and Also, our group dropped from 8 guys with 2 wheelers and my track sled to 4 guys and just my track sled. So we loaded up the 2 magnum sleds in a chain behind the track sled and we all piled in with our gear. And no go. Just sat there and spun since the track sled was so light. We moved one of the guys and had him sit on the wood box on the track sled and we were able to start chugging along. The slush was all frozen from the high winds and temps dropping to 0F the night before. We may have looked like a circus train but it just kept moving along about 1/2 speed at full throttle. I was amazed at how well it did with that much weight to drag around. Overall I am very happy with it, but still want to change a couple things. Option 1: Change gearing and keep the same motor setup which has a couple of downfalls. The jackshaft that I would need to increase the tooth count on the sprocket has no room to do so unless I notch out the tunnel, I have not measured how much room under the tunnel I have before hitting the track. I might not have any room to gain sprocket diameter at all. Secondly, the 6.5hp predator has no charging coil for powering a headlight, and it does not have electric start, not a deal breaker as it starts well pulling it by hand but would be nice to hit a button to start and go!Option 2: Buy a 13hp Predator engine and gain power, charging capabilities and electric start. I would also have to buy a new torque converter as the shaft sizes are different. Keeping the same jackshaft sprocket gearing since the double HP should be able to keep the RPMs higher. Oddly the 13HP is governed at 3600RPM and the 6.5hp is 3800RPM per specs, but I expect it should still be able to hold full RPM under all loads. Option 3: Try and sell the current track sled as is and then build version 2 this summer using everything I have learned from version 1. This would allow me to start with a newer chassis possibly with a gearbox with reverse. Newer chassis would have all suspension under /inside track vs current sled that has rear shocks outside the sled that is impeding handlebars form folding over the top of the current sled. Lastly put larger HP engine on new sled with electric start (just like option 2) I will likely just run it the way it is currently for the rest of the season, unless I find the cash to do the upgrades above what I could sell the current sled for. Right now we have no snow on the ground at home so it will just sit for the time being....I highly recommend the project if you have the tools to do so. I use the welder at work so until I buy my own I may not be pursuing option 3 as it has been a pain not being able to do that part at home on my free time.
Thank you. And I know all about having too many projects. Definitely a learning experience. Already making plans for a second one. We can rebuild him. We have the technology. We can make him better than he was. Better, stronger, faster.
About 98% done. Just have to take care of a few minor issues, and she'll be ready for the winter.16hp duromax engine, though thinking about a 10hp tillotson because it's 40lbs compared to the duromax 80#.Used a 1995 Polaris Indy 500 for the snowmobile parts Was able to use the disc brake set up from the snowmobile. Should be around 17-20mph.