73 F-31 only goes 15kts

rossjo · Post by **rossjo** » Sun Aug 02, 2009 10:16 pm

When? Oh yeah ... 2 minutes have passed ...

Yes, the Marine engines were probably rated higher, but still have a lot of weight for a pair of small block engines to push ...

Check it out, you can probably get a few MPH more, and not lug the engines down as much, with the proper prop combo ...

prowlersfish · Post by **prowlersfish** » Sun Aug 02, 2009 10:34 pm

It does need to be proped right for sure . But it its been a few months it sure could have a dirty bottom . dont take long round here and if its proped wrong it will even be worse

rossjo · Post by **rossjo** » Sun Aug 02, 2009 11:23 pm

Yes, we have to clean the bottom every 3 weeks in the summer here ... some areas every 2 weeks.

roninva · Post by **roninva** » Mon Aug 03, 2009 12:04 am

Clean the bottom every 3 weeks? Hopefully in the slip! I can't see paying $6/ft to haul & wash the bottom every 3 weeks!

I almost think they are 2 barrel carburetors. I'll check when I wander out to the boat again to verify it.

I'm definitely thinking the engine should be going faster than 3,000 rpm wot. Maybe new props are in order. Aren't they like $250+ ea?

prowlersfish · Post by **prowlersfish** » Mon Aug 03, 2009 6:42 am

I would hire a diver to clean the running gear , cheak with other boaters at your marina to see who they use . when its clean then you can see the rpm its turning , Then you will know if you need to change props . you may be able to re work the old ones . I have used bay propeller they do good work . When you look at the engines see what HP they are

http://www.baypropeller.com/

rossjo · Post by **rossjo** » Mon Aug 03, 2009 7:42 am

You don't need to haul the boat to clean it. You have a diver come by on a regular schedule and clean it. Theres one visiting your marina now, so check around ... its $100 per visit here on my F32.

randyp · Post by **randyp** » Mon Aug 03, 2009 3:01 pm

Those 318's should be 4200 RPM at WOT w/ 4bbl carbs: 225 bhp each.