Thread:

engine and out drive

building a boat using alfa 1 outdrives how criticle for left and right outdrive two rights or must it have a left and rt also does one engine need to run bacwards? or is it done in the out drives?

Originally Posted by materal girl

building a boat using alfa 1 outdrives how criticle for left and right outdrive two rights or must it have a left and rt also does one engine need to run bacwards? or is it done in the out drives?

Some one a lot smarter than me will chime in but here is what I think is right.
Left and a right is best for handling, but not mandatory.
I believe its done in the out drives.

All I can tell you is that a top fuel hydro that has twin shafts has a left and a right rotation prop on it witch is done in the gearbox, so that the boat goes strait. I dont know about io's, but I would say that the outdrive most likley has a right hand, and a left hand rotation. If it where me, id ask the open water gurus with the big boats. Just my two cents.

both motors spin same direction,clockwise! 1 rh and 1 lf is bestter for handling,and be careful how much horsepower your going to put through an alpha drive or they will self distruct!

ok i take it both engines spin clock wize and the out drives are what spin left and right. witch on on which side and how do you tell them apart? what size props on 30ft x 8ft with 260 hp engines and what rpm aprox at 30mph

to tell direction on drives spin drive shafts and see what way the prop shafts are turning,right on right side,left on left.go to mercury racing .com and they have a prop slip calculator or just google prop slip and there's alot a good sites,better yet call julie at throttle up propellers in florida,she is a very nice and extremely brilliant prop woman.you need to know your lower unit gear ratios,