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why does correct craft turn props rh rotation

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JoeinNY View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JoeinNY Quote  Post ReplyReply Direct Link To This Post Posted: July-02-2009 at 2:48pm
I can only speak to my experiences as a fat guy with an 83 which I will in fact ride in by myself and from time to time use to pull a skier/boarder alone and has had both a lh and a rh hand prop on on said 83 SN, it makes a noticable difference. Not particularily at slalom speeds, but for boarding I used to put an extra 440lbs on the passenger side when I had a LH engine to keep the wakes both with a hitable peak don't really need to do that with the RH prop. Its not like the single spotter will push you too far to the LH side now as they can easily sit in the middle if need be. Now could CC have done the same thing with a little hook, shimmy, or other no doubt.

Is the later hull different than the 83 in that there is absolutely no difference in performance between lh and rh rotation and luchog states, I doubt that too but I have no evidence to prove it. We do know that CC specifically stated in the literature for the later model boat that the rotation was to counteract the weight of the driver whom would often be the only one in the boat.

Was my 83 with a LH engine unusable.. .heck no it did the trick and did it very well in particular at speeds over 25mph, biggest issue would be resale value.

As for the big 425hp std rotation engine boats, with my experiences with LH and RH in the same boat if I was choosing between a 330 hp rh and a 425 hp lh it wouldn't take me long to index the pump and change the prop.   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GottaSki Quote  Post ReplyReply Direct Link To This Post Posted: July-02-2009 at 2:08pm
I concur.
I think after '82 it was just for legacy. and wanted to be special, and angle on the copetition. Its not uncommon for CC owners to think their boat has "cop engine, cop exhaust, cop carb, " cop rotation..

If it were that critical, CC wouldn't have put the mac-daddy LH rotation Hi-po 454 in the 2001's and BFN's.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tomski Quote  Post ReplyReply Direct Link To This Post Posted: July-02-2009 at 1:57pm
I've always heard it's to counterbalance the driver, but that makes no sense - the spotter does that. These are ski boats so are very rarely going to run with only a driver. Perhaps research showed that, statistically, drivers were very very fat and spotters were very very thin.

Just as i type this it occurs to me that you can sit tweo people on the port side of my boat, and most others, but only one on the driver's side, so on that basis the engine should go the other way to "balance".

A cynic might wonder if it was just a way of making a bit more cash for PCM et al!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote C-Bass Quote  Post ReplyReply Direct Link To This Post Posted: July-02-2009 at 1:40pm
Originally posted by Luchog Luchog wrote:

I agree on the older narrower hulls but after the 90's first TSC hull the RH prop is no longer needed. I have been on the same hull with LH engines and it performs just the same.



Maybe you just mis-spoke, but it's no shock that you've been on those hulls with LH engines, as that's what the all were. The still swing a RH prop because of the reduction 1.23 tranny reverses the input rotation, so the output ends up being RH.

Now if you've been on one that truly was swinging a LH prop, that's a different comparison.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Luchog Quote  Post ReplyReply Direct Link To This Post Posted: July-02-2009 at 12:19pm
I agree on the older narrower hulls but after the 90's first TSC hull the RH prop is no longer needed. I have been on the same hull with LH engines and it performs just the same.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: July-02-2009 at 10:28am
Originally posted by 62 wood 62 wood wrote:

OK here comes the proverbial "can-o-worms". Using this logic, which is what I think most arguments have been for the RH, why do boats with LH controls, like my Higgins, and some of the mid 60's CC's, still use RH rotation motors?   Im not trying to be a smart-azz, just always been curious?


Steve,
The 60's CC's like the skylark with a port side helm ran LH engines! The V6 was never made in the RH/RR.

Take a look at the props on a Higgins (from the factory). They are LH!


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Post Options Post Options   Thanks (0) Thanks(0)   Quote eric lavine Quote  Post ReplyReply Direct Link To This Post Posted: July-02-2009 at 9:57am
it was back in the day, narrower boats and bigger props would torque the boat and alot of the boats back then would be flywheel forward, the trans was mounted to the front of the engine on some, normal rotation and at the back required a right hand prop. out of many ski boat manufacturers CC is the only one....so i go with the odds
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 62 wood Quote  Post ReplyReply Direct Link To This Post Posted: July-02-2009 at 2:11am
Originally posted by Tim D Tim D wrote:

This subject has been on here before many times. One reason for the RH rotation is to offset the weight of the driver. So if you put in a LH and the torque rotates toward the driver alone, it will tilt.


OK here comes the proverbial "can-o-worms". Using this logic, which is what I think most arguments have been for the RH, why do boats with LH controls, like my Higgins, and some of the mid 60's CC's, still use RH rotation motors?   Im not trying to be a smart-azz, just always been curious?


Given that,my vote would still be to keep it RH. I think most of the GT motors on here are of the "head swap" type.

btw snowalt., you ride sleds?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tim D Quote  Post ReplyReply Direct Link To This Post Posted: July-02-2009 at 1:19am
This subject has been on here before many times. One reason for the RH rotation is to offset the weight of the driver. So if you put in a LH and the torque rotates toward the driver alone, it will tilt.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote boat dr Quote  Post ReplyReply Direct Link To This Post Posted: July-02-2009 at 12:51am
If you got into this sport thinking it was gonna be cheap, get out now..............
Now if you are here to stay, there are ways to rebuild on the cheap, but do not try to re invent the wheel.Both long and short block are available at a reasonable price.These motors are purpose built, and from the hours you listed it has done it's task well.
If you must use a LH motor.aka car motor,a PCM 1.23 tranny will allow the use of your RH prop.But this will add about 2000.00, when all the extras are figure in. New drive shaft , with fitted coupling mated to that new tranny will handle 500 plus HP>

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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowalternative Quote  Post ReplyReply Direct Link To This Post Posted: July-02-2009 at 12:17am
does anyone know the reason correct craft used rh rotation motors alot of the older boats?
are there any adverse effects in handling/turning if one converts to a lh motor other than the necessary changes-seals,trans pump,cam,dist gear,starter,prop,crank,etc?
Im just curious,it seems the lh parts are much less expensive as well as more choices available.
i cant find any posts on this subject & i think there are more than a few older boats w/gt-40 motors in them which would make them lh rotation unless these are simply head/induction swaps on rh motors with out the blocks & valve train being used
my apologies if this is a repeat post--i have a '83 2001sn which i'd like to freshen the motor (2000hrs) & am trying to find most economical way to refresh
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