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Counter Rotating on Cats

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Old 11-20-2009, 06:02 PM
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Default Counter Rotating on Cats

I have a question for the Cat guys out there....Is it important to counter rotate the engines on cats with big power? I am talking boats like Skater, MTI, etc...

I am just curious...thanks.
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Old 11-20-2009, 06:14 PM
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Engines=NO
Drives=YES
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Old 11-20-2009, 07:09 PM
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On the early Arneson Cats we reversed rotation on one engine.
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Old 11-20-2009, 07:09 PM
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Engines=NO
Drives=YES
Thanks, Griff...That's what I thought....

Now, with Arnesons or BPM drives, is it the drive that does this, or the transmission?
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Old 11-20-2009, 07:55 PM
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Thanks, Griff...That's what I thought....

Now, with Arnesons or BPM drives, is it the drive that does this, or the transmission?
That is a question for Rik in those days the drives were turned whatever direction the input shaft was turning and there were no reversing transmissions that could take the power and RPM of the racing Engines which BTW they did not seem to mind what direction they turned.
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Old 11-20-2009, 10:57 PM
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ARE YOU FOR REAL??????????
No we always had a reverse rotation motor and the Dyno pulls showed not much difference no more that you would see between two standard or left hand rotation motors.

Which is great for the port side but what do you do for the starboard side? You need a right hand rotation motor.No Biggie.


Bear in mind this was when we had a crash Box connected Via a Jack Shaft to a drop case on the transom with the drive on the bottom of it no reverse rotation was built into it.

Beautiful setup, engine torque was perfectly balanced and you could spin the drive over with your fingers the drop box had ATF in it low loss Mr Arneson hid a great job on it. But That was then. Arneson #6 Boat Fayva Shoes Cat #2 The Surgen. everything that ran out front in those days.
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Old 11-20-2009, 11:06 PM
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I was talking to a guy today who makes 2-speed transmissions for performance boating and he mentioned that his transmissions can't counter rotate, so I was just wondering if this is a function of the motor, transmission, or drive....I am pretty new to this stuff, as you can see...lol
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Old 11-20-2009, 11:07 PM
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Originally Posted by Moving2Miami View Post
Now, with Arnesons or BPM drives, is it the drive that does this, or the transmission?

With Arneson's the drive is what determines the rotation...At least on ASD-7M's it is...One is gear driven and the other is Chain driven...
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Old 11-20-2009, 11:09 PM
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With Arneson's the drive is what determines the rotation...At least on ASD-7M's it is...One is gear driven and the other is Chain driven...
Cool....do you know if its the same on BPM drives?
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Old 11-20-2009, 11:13 PM
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Cool....do you know if its the same on BPM drives?
Not sure if Rik Wimp is around I'm sure he has the answer...He's the expert....I'm just a customer and very happy with my Arneson's...
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