brucebuck1
07.06.2021 10:09:36
"Standard" marine engine rotation is LH rotation. [links]
See full version: Twin ob engine counterclockwise or same
"Standard" marine engine rotation is LH rotation. [links]
The whole question of direction of engine rotation can get kind of confusing and in fact could be different between boats with gasoline engines and diesel engines. First let's set down some definitions:
Quote:
ENGINE ROTATION
Front of engine - the anti-drive end. The end with the drive belts and water pump. In a v-drive installation, this end faces aft.
"Opposite" or "Reverse" marine engine rotation is RH rotation. [links]
That's where I was at with the motor I have now. Got a killer deal on a long block been sitting at the marina's shop for years. Started swapping parts from my 327F and noticed timing chain on marina's 327 and gear driven on my 327F. Is this the right engine 'cause it's not original. Should get a another prop, but I would also need another starter and didn't know if the Paragon could be reversed (does it matter?). Altenator? The cracked 327F had very low hours, not a scuff on the lifters or cam lobs and very clean on the inside of the block & valve covers. so I swapped all internals except for rotating assembly and oil pump. New lifters, sandblasting & painting bits 'n bobs. [links]
Some marine conversions keep the chain drive for both rotations but change the distributor drive gear to get the rotation correct for the oil pump. here
that's where my confusion is coming from. I'm comparing standard marine to a car because these engines are flywheel aft like a car. I'm just going to eliminate "opposite rotation" from my marine vocabulary cause it's tweaking my head.
The standard of the marine industry is for a Right Handed prop rotation in single screw hulls and on the Starboard side in twin screw hulls no matter how this is achieved.
Left Hand Rotation is "opposite". You can use a Left Hand prop on a single screw hull, but your prop choice will not come as easily. You can probably get any prop you want, but odds are you won't find one on a shelf in just the size, pitch and type you need at a reasonable price as easily as you will for the same model in Right Hand rotation. Since a Right Hand prop is in use in both single and twin screw boats, more will be made and sold since Left Hand props are usually only found in twin screw applications for counter- rotation, there will be a greater emphasis put on Right Handed props.
The same holds true for camshaft selection on an engine that rotates backwards as compared to a car engine, but in our usage this is less of a problem.
Thanks Jim; that's some good info. here
The Paragon trans can be set up for either rotation If its a hydraulic trans, the pump has to be changed to the correct position for the rotation. The pump is the same for both rotations but it has two possible locations that essentially flip the inlet and outlet ports to accomadate the rotation change. more
Another way to prevent getting this page in the future is to use Privacy Pass. You may need to download version 2.0 now from the Chrome Web Store. [links]
If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. here
Completing the CAPTCHA proves you are a human and gives you temporary access to the web property.
If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices.
Cloudflare Ray ID: 687f3b620cf01640 • Your IP : 46.32.66.208 • Performance & security by Cloudflare here
Front of engine - the anti-drive end. The end with the drive belts and water pump. In a v-drive installation, this end faces aft.
Right-hand engine rotation - Flywheel turns clockwise when viewed from the rear of the engine. In a v-drive installation, this would be viewing aft from the rear of the engine.
Gasoline marine engines, until recently, could be obtained in either right-hand rotation or left-hand rotation. I say until recently, because some of the newer electronically controlled fuel injected engines are only available in a single direction of rotation. The same is true for diesel engines; they are normally only available in a single direction of rotation. Thus in a twin diesel installation or when both engines have the same direction of rotation, one of the transmissions or v-drives will need to reverse the rotation.