Propless?

[MR nova @#25]

My build is comming to an end, and I have no clue what size props to put on this boat. (No Outdrives on the boat when I got it )
What:1976 wellcraft Nova 250 offshore, with twin standard rotaion Mercruiser ford 302's with 4 barrel carbs.
Where: Raratin bay/NJ area.

Thanks in advance

 

[alldodge]

What is your drive ratio?

 

[MR nova @#25]

That's a good question... who would I get that info?

 

[alldodge]

From you
Remove drive, put in gear

Rotate drive 10 times counting drive shaft and prop shaft rotations. This will give ratio

 

[jimmbo]

WOT Range for Engines of that Era, is likely 3700-4200
I think that Engine was about 215hp

Edit: "(No Outdrives on the boat when I got it )"

Did the Outdrives at least come with the Boat-Motor?

 

[MR nova @#25]

WOT Range for Engines of that Era, is likely 3700-4200
I think that Engine was about 215hp

Edit: "(No Outdrives on the boat when I got it )"

Did the Outdrives at least come with the Boat-Motor?

Let me check my spare outdrives just to be sure.

 

[MR nova @#25]

From you
Remove drive, put in gear

Rotate drive 10 times counting drive shaft and prop shaft rotations. This will give ratio

Copy that, One more question. If I provide the Serial number for the outdives ( The gold stickers are still on the outdrives) is there a database that provides this info?

 

[alldodge]

Copy that, One more question. If I provide the Serial number for the outdives ( The gold stickers are still on the outdrives) is there a database that provides this info?

Yes, Merc is the only place and it takes someone with access the the data base to get the info of ratio.

 

[MR nova @#25]

Yes, Merc is the only place and it takes someone with access the the data base to get the info of ratio.

Thanks. Just in case, the numbers are. 4456082: 4456079.

 

[MR nova @#25]

What is your drive ratio?

I just got off the phone with Merc. its a 1.5 ratio.

 

[alldodge]

Most boats come with the 1.5 unless their real heavy. Props would be in the 19 and 21 pitch. The 302 not being a power house and a 25foot boat, I would go with the 19

 

[MR nova @#25]

Most boats come with the 1.5 unless their real heavy. Props would be in the 19 and 21 pitch. The 302 not being a power house and a 25foot boat, I would go with the 19

THANK YOU!

 

[Scott06]

X2 on the 19” as a good starting point. Might be better to rough in wot rpm with less expensive black max props

 

[MR nova @#25]

X2 on the 19” as a good starting point. Might be better to rough in wot rpm with less expensive black max props

My 19's came in today.