Counter-rotating engine??????
 

What changes have to be made to make an engine counter-rotating??????

Starter,
gear drive the cam ( cam and dist/oil pump still need
to turn l/h),
water pump,
piston pin offset ( notch will face rear instead of the front
of the engine)

And I'm thinking there's something different with the front
and rear seals.

that's about all I can think of now.

ok so on a boat with older arnesons wouldnt it be easier to rig it so that one tranny is always running in reverse, then to build an engine that is counter-rotating??????

I'm pretty sure the trans can only rotate one way(for normal use). Wouldn't the change be made in the drive itself (gear placement, type ???)




Darrell.

you couldnt get an old arneson as a counter-rotating drive so therefore all the old arneson boats had counter-rotating motors

What type of transmissions did they use?? Or did they use a crashbox?



Darrell.

borg warners.......

U would need a special tranny, the clutchplates are only forward in them for the revers they only have 2 i Think.

They would burn up in 3 min.

Trusst me i know !:rolleyes::eek:

I actually think they used somesort of gesrdrive trannys , since they are way lower on the transom then the engine and the counter rotating on just spun backwarts.

yeah the boat i am talking about has a counter-rotating engine but I am wondering how you can change the set-up and run two standard engines??????

I believe even the blocks are a little diffrent on the sealing ends. So i don't know !!

If its fine ,just leace it . Or rebuilt it like it is as a counter rotating one.
Or sell it and stick an other one in ?????

But even better if u take them both apart at the same time ,,,U FIND OUT WHATS DIFFRENT !!! LOL

And if you do ,,let us know .:ernaehrung004:


PS.: like i said befor to you,,,KEEP YOUR BOAT,ITS AWSOME !!!!!!!!!!!

Borg Warners can turn either way, you just rotate the valve body 180 degrees to change rotation.

thanks bowtie, then i have to ask why would people go through the trouble of having an oddball motor in their boat when they can just change the tranny around????

I had no idea that the BW could be set up for reverse rotation. Se... ya learn something new everyday.


Darrell.

Good ?????



Darrell.

There are several ways to do this.

A standard chain drive and a reverse rotation cam, or a gear drive so that you can use a standard rotation cam.

Counter rotating cam requires a different distributor gear, some say rear main seal and a starter.

BW just needs the pump flipped they say.

It is my understanding that most if not all BW trans can not be ran in reverse. Maybe it is just the older ones? Reverse rotation engines are a rarity anymore. I am running twin disc gears and one is ran in reverse with older Arnesons. Seems to work fine.

The velvet drive can have the pump indexed to run standard or reverse rotation. That trans rotation has to be the same as the engine rotation, ie you can not run a velvet drive in reverse at full power. Most twin inboard engines are set up this way, one standard, one reverse rotation engine with trans pumps indexed accordingly.
The boat you're describing was probably setup prior to the widespead availability of transmissions like the Hurth, BW 5000 series, etc that can be run in both directions on a standard rotation engine.
And as Rik pionted out, some arnesons are availale with a drop box that is chain or gear driven that change he prop rotation. This allows for 2 standard rotation engines.