40hp to 60hp

[titaniumneck]

15 ft sprint bass boat, question is would repowering from a 40 tohatsu to 60hp mercury make enough difference to justify the money spent? Sprint goes about 27mph now with 40 tohatsu.

 

[jimmbo]

if both engines are both crank rated, or both prop rated, set up correctly, have power trim and are correctly propped, expect an increase about 4 or 5 mph.

 

[titaniumneck]

That's not enough for me to put out that extra expense and effort. Im going to look for about a 90hp.

 

[Sea Rider]

Sprint goes about 27mph now with 40 tohatsu. At which wot rpm and how much loaded ? You need more speed, better hole shot ? Is that 40 HP a 2-4 strokes, 2-3 cylinder OB ? Is current prop the standard factory delivered one ?

Happy Boating

 

[titaniumneck]

2 stroke, 2 cylinder, aluminum 11 pitch prop, and s/s 12 was too much.

 

[Sea Rider]

You need to tach current 11 pitch prop on a wot run as usually loaded on flat calm water, if it's a 40C, runs 5200-5800 rpm, cam maximize a prop to run max wot range, but without a tach OB is dead. Personally would invest in a Hardline induction tach, check wot rpm and go for a prop maximization. Cheaper than going for any other OB.

Happy Boating