Outdrive Fitment Question

[SNSTER]

I have a boat I am planning on restoring with a whole new driveline. I have already Installed a new built 383 stroker some time back. Now wanting to do a full restore with a new updated outdrive. My question is the boat currently has a Volvo 280 on it. I am considering changing that out to a volvo penta Cobra SX. Will the hole in the transom be the same size for both outdrives? I know the transom plate and everything will have to be changed. This might be a silly question or just some wishful thinking on my part. Thanks

D.J.

 

[bruceb58]

Re: Outdrive Fitment Question

The hole that you have is bigger. If the drive that you have is working, I would stick with it. Those 280s are awesome drives.

 

[SNSTER]

Re: Outdrive Fitment Question

One I dont think it has the gearing I need. Trying to get this boat into the 70 mph range and its only in the mid 50's with a 23P prop. I have had several problems with this outdrive already and would like the reliability of a newer unit. Parts are also very expensive for it and hard to find.

 

[bruceb58]

Re: Outdrive Fitment Question

You are talking about rebuilding your transom to use a newer drive though. Not an easy task.

 

[SNSTER]

Re: Outdrive Fitment Question

So if I rebuild the 280 is there a way to change the gears in it to make it more desireable for me to use?

 

[bruceb58]

Re: Outdrive Fitment Question

That is a DonS question as I am not sure if those are in the upper or lower. What size boat is this on?

 

[SNSTER]

Re: Outdrive Fitment Question

Pretty sure they are in the lower. Its a 24' and ugly hence the restore lol

 

[sqbtr]

Re: Outdrive Fitment Question

They are in the lower, show a pic of that sweet 280T

 

[bruceb58]

Re: Outdrive Fitment Question

Put a duoprop on it!

 

[SNSTER]

Re: Outdrive Fitment Question

Looking pretty rough isnt it

 

[sqbtr]

Re: Outdrive Fitment Question

+1 on the DP

 

[SNSTER]

Re: Outdrive Fitment Question

Ok so what is the best way of going to a duoprop on this outdrive? My other boat has a DP but it has a b3

 

[SNSTER]

Re: Outdrive Fitment Question

Anybody have any ideas on the DP or gear change?

 

[Don S]

Re: Outdrive Fitment Question

You can change the lower unit to change to a DP. They are so much better than the Bravo III drives you won't even believe it.

 

[SNSTER]

Re: Outdrive Fitment Question

I was hoping you would chime in Don. Exactly what is the advantage to the duoprop vs. a single? Is it just the better maneuverability? What gear ratios are available in the DP? Hope you dont mind me picking your brain

 

[Don S]

Re: Outdrive Fitment Question

Small blocks run the 1.95, big blocks normally use the 1.78.

The DP's are only rated at 50 mph drives, I know of a few in the low 60's. 70's ????

25% better efficiency, fuel milage, and getting on plane, better control. Other than that, they are about the same as a single prop.

 

[SNSTER]

Re: Outdrive Fitment Question

Awesome thanks for the info