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Learning how to build Lotus Seven replicas...together!
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PostPosted: October 12, 2020, 2:35 pm 
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Joined: February 8, 2014, 10:47 pm
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Location: Cornholio OR "Where the magic happens"
Notice the ear protection in use and the RPM at ~40mph, 6000+rpm.
Fine for off-roading or autoX but not in town or especially highway use.

Gear it for a comfy cruise rpm and it will be too high (no more burnouts) to get out of it's own way.

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PostPosted: October 12, 2020, 3:29 pm 
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Joined: October 10, 2020, 5:14 pm
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Laminar, the grindhardplumming snowmobile powered Triumph would just about be perfect if a cruise control system could be used. I'm sure that a exhaust system could be changed relatively easy.


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PostPosted: October 12, 2020, 4:33 pm 
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Joined: October 19, 2012, 9:25 pm
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Location: Summerville, SC
Bent Wrench wrote:
I don't think the snowmobile / CVT setup is suitable for a car.

Unless you like a screaming motor, that setup has no cruise mode


Not entirely true. Using a jackshaft, the right weights, and acceptable final drive gearing, you can have a 60 mph cruise at less than 3000 rpm
It's just that most racers tune the CVT to the peak power band. On 2 strokes a lot of them ran about 8000 rpm. My old A Mod was tuned for 7000 (both the AAEN pipes and clutch)- for better engine life.

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http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

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http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


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PostPosted: October 12, 2020, 4:40 pm 
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Oh yeah, I just realized there's no clutch (manual) for a snowmobile engine.

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PostPosted: October 12, 2020, 5:09 pm 
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I might be wrong and someone please tell me and (explain it if you can) if I am. But couldn't a shaft be ran off of the CVT or before/after it controlling the throttle position be somehow linked to a cruise control system?


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PostPosted: October 12, 2020, 6:56 pm 
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Rifleman06 wrote:
I might be wrong and someone please tell me and (explain it if you can) if I am. But couldn't a shaft be ran off of the CVT or before/after it controlling the throttle position be somehow linked to a cruise control system?


I'm not sure how it works, but Toyota is running a CVT in several cars. They have cruise, but I'd bet it's a more complicated speed and TPS sensing PID loop controller.

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http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


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PostPosted: October 12, 2020, 7:28 pm 
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Thanks TooBusy, I was recently looking at snowmobile engines and then fell into the racing snowmobile rabbit hole. As some me of them put out over 200 horsepower yet weigh around 100lbs like these http://www.aaenperformance.com/V4_racing_engine.asp
Don't know if there's a CVT that could handle this amount of power without breaking or not for extended periods of time. Such as in the highway or in a daily driver. By the way I would like to use 235 X 65 X 17 tires or around that size.


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PostPosted: October 12, 2020, 11:35 pm 
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Joined: July 29, 2006, 9:10 pm
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Location: Oregon, usually
Rifleman06 wrote:
...I want to use a computer free automatic transmission...the Dana 30 axles are among the smallest that can be equipped with a Eaton TrueTrack in the front axle and a manual cable operated OX locker in the rear axle...I was thinking of going with a hardware engine Briggs and Stratton, or one of the newer Predator engines...
Okay, I'm sold. You've thought it out, thought it out better than I have, and I thank you for satisfying my curiosity.

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