engine rotation

[joewoody]

ok new to sight and a newby to nautiques. just trying to figure out if I have a lh or rh rotating motor I have a 2000 san v drive. which way do you look at it to tell if its right or left hand. if you look at the front of the motor it turns to the right but the prop is right as well.

[DanielC]

If you are looking at the end of the motor, with the accessory drives, and the flywheel is away fron you, clockwise is right hand rotatoin, and generally "normal"
If you are looking at a propeller, from the rear of the boat, and clockwise rotation drives the boat away from you, that is a right hand propeller.

[jhersey29]

Check the engine plaque/model identification and compare with manual( http://www.planetnautique.com/vb3/co...Owners-Manuals). For example model PXLDWVR20 is

P = Pleasure Craft
X = Fresh Water Cooled
L = Left Hand
D = Horsepower
W - drive manufacture
V = Drive Type
R- Prop Rotation
20 = drive reduction

[TRBenj]

If you are looking at the end of the motor, with the accessory drives, and the flywheel is away fron you, clockwise is right hand rotatoin, and generally "normal"
If you are looking at a propeller, from the rear of the boat, and clockwise rotation drives the boat away from you, that is a right hand propeller.

Sorry Dan, you have it backwards.

In the marine world, engine rotation is referenced when standing at the rear of the motor (flywheel side) and looking forward. From this orientation, clockwise = RH (reverse rotation). Counter clockwise = LH (standard rotation).

The ID tag on the motor (second digit, L or R) will tell the story as well. I am fairly certain that CC got away from using RH rotation engines to turn the RH prop in v-drives by the mid 90's though... dollars to donuts says this one is a Lefty.

[Brichter14]

I am fairly certain that all SANs from 95-05 are right hand rotation. New rotation in 06.

[Zach@n3]

Birchter, you are correct until 06. 07 was the year the propeller rotation changed to LH on V drive boats but the engine rotation stayed LH. They did something different with the V drive not the engines. So any V drive engine from 95- seems to have been a LH engine. We are all a little foggy on the 92-94 V drive Excel/Footer engine rotation but know for sure 91 was a RH engine. Anywho.

[s_kelley2000]

Birchter, you are correct until 06. 07 was the year the propeller rotation changed to LH on V drive boats but the engine rotation stayed LH. They did something different with the V drive not the engines.

He is correct if talking about the 210, that did in fact get the PCM V-drive and LH prop in 06. The other V drives swung RH props until 07. But I agree with you that prop rotation was determined by the transmission/V-drive setup and not the engine rotation on 95+ v-drives.

[Zach@n3]

You got me on that one Shawn . Not enough coffee this morning ha.

[DanielC]

Automotive world, standing in front of the engine, normal rotation is clockwise. Walk behind that engine, and that engine is turning counterclockwise.

[charlesml3]

Just for my own morbid curiosity... what difference does it make? It has to turn one way or the other. It's a matter of noticing when you put it in reverse so you know which way it's going to prop walk, isn't it?

-Charles

[Zach@n3]

Correct Craft spun props reverse rotation so the rotational torque of the drivetrain counter acted the off set weight of the driver on the right hand side of the boat(to make the boat run as level as possible at slalom speeds). The larger the hull the less it matters case in point the reason they went to LH stuff in 06/07. They retain that in the Ski 200 because all the old school guys get pissed if the boat backs up to the right instead of the left (me included) haha.

[DanielC]

Correct Craft did not spin the props in reverse rotation. The standard way for a propeller to spin is clockwise, when viewed from the rear, facing forward, and the propeller moves the boat forward. Most outboards, inboard-outboard boats have a right hand propeller. The blades on the starboard side of the propellet are pushing down on the water, and this lifts that side of the boat, against driver weight.
Before Correct Craft used transmissions tha reverse shaft rotation, they used a reverse rotation, or left hand engine to accomplish this. This is not the normal way an engine turns. It requires a special camshaft, and pistons installed differently, if the pistons have offest piston pins.

Because of the angle the prop shaft goes out of the bottom of the boat, the blades on the right side of the propeller actually push harder, than the same blade when it spins around to the left side of the boat. This effect is there in both forward, and reverse, just going backwards, the propeller is not blowing water on the rudder, so the rudder is ineffective.