I am not putting it back into a boat. I was thinking about installing a clutch in front of the Velvet Drive and using it to power a nostalgia front engine dragster.

ther ar maney choices for gears. if you ar useing a vdrive prop shaft would turn oposit engine, if you use a center mount engine witha simple forwerd reverse boxb warners can be set for ether rotation. reduction gear you  will have a choice of rotation, (on modern) gears. if looking for a gear ,i would consult a marine dealer for best results.

Ya know...thinking about this in that aspect, wouldn't it also make sense that to stabilize the single engine torque rotation that if you reverse the engine from the prop, you then would also even out the torque twist from a big engine in a relatively small watercraft? This makes sense.
Anyway, what trans combination would be best for a F.E.D. with this engine and a radical cam, headwork, etc...???

just had access to web site re dual engine instalations. ther quote is counter rotating props a must for neutralizing propellor torqe which dramaticle improves vesel handeling and performance.Aded to makes vesel easeyer to dock and turn..Aswell as propes turning port cw starboard ccw lifts the stern . props turning port ccw starb.cw. lifts the bow.
  could find no info on single engines being ccw frome the front being aney advantage.or reason other than prev.coments
 have a reletive who ownes a 45ft pleasure craft with 2 c9cats rated at 500hp each  driven threw twin disc gears( 1 runs reverse other forwerd) to give the counter cw and ccw rotating props.controles work as if bothe ar forwerd in the forwerd position.

All single engine Y Block boats I have come across were reverse rotation. It either has to do with an over abundance of reverse rotation drives/props and it was probably cheaper to reverse the motor rotation than to buy a new drive who knows? Maybe the companies building the boats got a super deal on reverse rotation drives in order to use them up? There must be somebody in the boat bussiness that knows the reason.

I was not aware of the differnces in the cams (Teach me to listen to unconfirmed sources)  

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

Gary, good luck with this ! chuckle.



  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

modern dual engine boats have clockwise rotating engines,with 1gear in reverse  to acomplish what you stated. modern reverse gears have same size clutches for forwerd and reverse. with vdrives you still need 1rev 1 forwerd.cat  or perkins do not make cc engines,in the marine  world. 

When two or more props are involved, then counter rotation helps to compensate for the magnified torque thrust that would be present if the props were simply rotating the same direction.  Air planes with dual (or more) engines also have counter rotating props and this goes all the way back to the Wright Brothers with their first flight which had dual props.  The Wright Brothers had this figured out before ever making their first attempt to get their plane off the ground.

Lorena, Texas (South of Waco)

That is very possible, especially considering that the 1962 boat ran a 1957-8 312. The company was only in the boat business for a few years and the machines they designed were pretty ahead of their time. This boat ran about 50mph on the water and supposedly could do a full throttle U-turn in a radius the length of the hull. I'm told it would pull a skier out at about a quarter throttle. It was a good friends uncles, then his dad's. He has told me some stories. It had a wooden plaque on the rear that said JOKER.

Twin engine boats obviously have the props closer to each side so in that application having both screws going in the same rotation would cause some steering issues and possible even porpoising, but I think it is more to do with harmonics than anything else.
Would it not be easier to just have an idler gear in the drive train to reverse the prop direction on one of the pair rather than to redesign an engine?
Probably not as if it was this easy then this would be the case, but no there must be other forces at play than just prop directional rotation.
In a single engine application it doesn't matter which way the engine rotates.
Most social ski boats are mid engined with a straight shaft and dog clutch or velvet drive. When you move up to ski or circuit race boat then the engine is usually a rear mount running through a Vee box hence the same engine is now spinning the prop shaft in the opposite direction and requiring a L/H prop.
Both boats operate perfectly as they were designed and steer and handle correctly despite spinning the prop shafts in opposite directions.

I would still tend to hypothesise that this engine was made available at a price that couldn't be refused from a cancelled order or a previous twin engine boat.


Gary - 1958 Star Customline and 1940 Ford Deluxe Hotrod