some boats with dual i/o's will have one of the motors spin backwards. besides that i cant think on anything that should be different

 

Looking from the back of a boat, a standard rotation prop turns clockwise. But you can get outdrives that spin the other way. If you have two engines, it's best to have the props turn different directions to avoid them walking sideways.

Here's what I found about the difference between motors. Basically gaskets, freeze plugs, water pumps, exhaust, and anything electrical.

http://www.boatfix.com/how/marineeng.html

 

wait, no water pump?

 

well mine was a jet boat... it sucked in water n shot it back out without a pump, water neck ran to my water cooled exhaust manifolds instead of a radiator...

 

Probably like a jet ski. Takes water from the high pressure part of the jet pump and forces it through the motor.

 

that explains it. open cooling system, and gasoline vapor proof

 

I always thought the motor was the same but it was in the out drive. Looks like I was wrong.

 

Jet drives use a fitting tapped into a high pressure area of the pump to supply cool lake water.

 

running salt water through anything is such a bad idea. id rather make room for a radiator. salt water rusted the exhaust on my old dodge to its death in 1 year

 

I'm looking for 55-60 tops.

 

That's fast but you'll need a 350 to get there. A 4.3 won't do it.

 

if theyre making custom camshafts anyway, at that point its pretty easy to spin a motor backwards. especially if it doesnt have a water pump. Think what else has to be reversed.. a couple wires?

 

Boats run in salt water year round and don't have many issues. I flush mine when I take it out but I don't worry about it.

 

where are you planning to go that fast in a little boat?

 

yup, and i still think its bad news

 

They charge like $1000 for reverse rotation. The timing setup, the distributor, and the cam are all different. I'm sure there's more.

Have you ever seen the Ski Doo 2 strokes that run both directions? They're pretty neat. Instead of adding a reverse gear, you hit a button, the motor dies, and starts up in the opposite direction.

 

******* are stealing my money in vegas and I don't have a vault to store it in. How do I get a vault?

 

Do you guys think CVS or someplace like that would sell eye droppers?

 

never seen one but ive heard of them. pretty cool. i heard there was a 3 cyl saab back in the 80s that would run in reverse if you switched the plug wires. wonder if thats true

 

i dont remember. click on "my casino" and look for it there