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Old 02-20-2003, 01:18 PM
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Post Reverse rotation

In an effort to learn more about engines, i will ask you guys and all your seemingly endless knowledge. I don't intend to build one and don't know if it would even be helpful, but it seems to me that if you could make an engine which spins the opposite direction from every other chevy and ford i've ever seen, it would greatly aid traction in circle track cars. i was curious if anyone does this, how it's done, and if it really would make a difference at all.

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Old 02-20-2003, 01:31 PM
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You need a reverse rotation cam (single gear drive will accomplish that), modified trans and starter as well as modifying the drive belts to reverse the water pump and accessory rotation.

Why do it? The only reason to do this very involved modification is to take advantage of the torque reaction of the engine and the typical left rear tire plant that it creates, reversing the rotation would plant the right tire instead and help out on counter clockwise running tracks which circle track racers usually race on.

There is no reason to use it unless you run a dual engine/dual prop boat and want to counter this effect by running one engine opposite the other.

It would be a waste of time/money otherwise.
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Old 02-20-2003, 01:56 PM
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I've seen Chrysler Marine 354 hemi engines advertised on eBay as counter rotating pairs. Can you imagine a 25' Chris-craft w/ twin blown 354s!?!
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Old 02-20-2003, 02:15 PM
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As a matter of fact virtually all marine application using two inboard engines have one engine running reverse rotation. This corrects the torque effect of the propeller rotation that tends to make single screw engines want to turn the boat in a circle. So the parts are available at Mercruiser! And you thought you were onto something new?
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Old 02-20-2003, 02:57 PM
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The crank also has to be specially modified at the oil passages/troughs. Corvairs and some Fiats and Simcas were reverse rotation, and probably others.

[ February 20, 2003: Message edited by: woodz428 ]</p>
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Old 02-20-2003, 03:17 PM
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well, actually, i did kinda think i was onto something new. looks like i have a lot to learn!
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Old 02-20-2003, 03:27 PM
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Smokey Yunick, the great innovator, was caught by NASCAR inspectors using reverse rotation on a early 50's Hudson race car. The Hudson was a current model at the time. So Smokey had it working for him 50 years ago.


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Old 02-20-2003, 03:58 PM
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I seem to remember an article several years ago about a guy in Calif. who "sectioned" a SBC and reversed the rotation, and was cleaning up the circle tracks in that area. Anybody else see that article? <img src="confused.gif" border="0">
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Old 02-20-2003, 09:33 PM
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Interesting idea, but if someone someone had a reason to do it would the drive train also have to be considered?I think an automatic trans would not work but what about a stick shift?How about the rest of the drive train? Just a thought.
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Old 02-20-2003, 09:34 PM
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Interesting idea, but if someone someone had a reason to do it would the drive train also have to be considered?I think an automatic trans would not work but what about a stick shift?How about the rest of the drive train? Just a thought.
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Old 02-20-2003, 09:39 PM
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SORRY!! I have no idea how I managed to put that on twice!
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Old 02-20-2003, 09:43 PM
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You could turn the rear end over.
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Old 02-21-2003, 03:21 AM
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The early Toronado had a trans that worked in reverse rotation because of the chain between the engine and it. I think it just had the sprag clutch installed in the opposite direction. I recall having to re-remove one and pulling it back down and reversing the sprag when we couldn't get it to pull.
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