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11-20-2009, 06:02 PM
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#1
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Platinum Member
 Platinum Member
Join Date: Nov 2008
Location: Las Vegas, NV
Posts: 112
None Right Now-Looking!
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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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11-20-2009, 06:14 PM
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#2
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Charter Member # 55
 Charter Member
Join Date: Oct 2000
Location: Omaha
Posts: 11,045
32 Active Thunder
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Engines=NO
Drives=YES
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11-20-2009, 07:09 PM
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#3
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Platinum Member
Platinum Member
Join Date: Apr 2001
Location: Beautiful Fort Lauderdale www.cheetahcat.com
Posts: 10,185
Slippery when wet!
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On the early Arneson Cats we reversed rotation on one engine.
__________________
Slippery when wet. repair,truing and custom modification, cheap reliable speed.
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11-20-2009, 07:09 PM
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#4
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Platinum Member
Platinum Member
Join Date: Nov 2008
Location: Las Vegas, NV
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Quote:
Originally Posted by Griff
Engines=NO
Drives=YES
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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?
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11-20-2009, 07:55 PM
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#5
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Platinum Member
Platinum Member
Join Date: Apr 2001
Location: Beautiful Fort Lauderdale www.cheetahcat.com
Posts: 10,185
Slippery when wet!
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Quote:
Originally Posted by Moving2Miami
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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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.
__________________
Slippery when wet. repair,truing and custom modification, cheap reliable speed.
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11-20-2009, 10:57 PM
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#6
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Platinum Member
Platinum Member
Join Date: Apr 2001
Location: Beautiful Fort Lauderdale www.cheetahcat.com
Posts: 10,185
Slippery when wet!
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Quote:
Originally Posted by OUTLAW11
 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.
__________________
Slippery when wet. repair,truing and custom modification, cheap reliable speed.
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11-20-2009, 11:06 PM
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#7
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Platinum Member
Platinum Member
Join Date: Nov 2008
Location: Las Vegas, NV
Posts: 112
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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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11-20-2009, 11:07 PM
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#8
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Platinum Member
Platinum Member
Join Date: Jan 2007
Location: Omaha - LOTO
Posts: 1,197
Nor-Tech 3600 SuperCat, 2006 280 Sundancer
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Quote:
Originally Posted by Moving2Miami
Now, with Arnesons or BPM drives, is it the drive that does this, or the transmission?
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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...
__________________
"Life's tough. It's even tougher if you're stupid."
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11-20-2009, 11:09 PM
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#9
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Platinum Member
Platinum Member
Join Date: Nov 2008
Location: Las Vegas, NV
Posts: 112
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Quote:
Originally Posted by fountain4play
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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Cool....do you know if its the same on BPM drives?
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11-20-2009, 11:13 PM
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#10
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Platinum Member
Platinum Member
Join Date: Jan 2007
Location: Omaha - LOTO
Posts: 1,197
Nor-Tech 3600 SuperCat, 2006 280 Sundancer
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Quote:
Originally Posted by Moving2Miami
Cool....do you know if its the same on BPM drives?
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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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"Life's tough. It's even tougher if you're stupid."
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