rpm question

[junior1113]

i have a 93 200hpvi have 2 props the 19 puts me at 5350rpms the 17 puts me at 5850 i like the 19's mid-range speeds at 4000 are the rpms to low to run on the 19 and would the gas mileage be better the rev limiter is 6700

 

[Faztbullet]

Re: rpm question

What size boat are you running to only be using a 17 & 19 pitch?

 

[junior1113]

Re: rpm question

93 2000 hydra sport deep v center counsel aprox 3100 lbs with motor and 1 person

 

[junior1113]

Re: rpm question

93' 20'6" hydra sport deep v center counsel approx 3200 lbs with motor

 

[ezeke]

Re: rpm question

Running at 5850 is better for the motor and should not affect fuel consumption negatively. Your maximum theoretical speed with the 17 at 5850 RPM should be approximately 50 MPH.

http://www.iboats.com/Hydra_Sports_Boats__2000CC__1993/bp/64b43425r1

 

[junior1113]

Re: rpm question

they both hit low 40s but at 4000 the 19 does 31 and the 17 does like 27?

 

[Silvertip]

Re: rpm question

you can't have it both ways. The engine should be propped so it reaches the upper end of the manufacturers rpm band at wide open throttle. The 17P does that. The prop on a boat is the transmission but it has just one gear. If you change props you change speeds. That's why you have a throttle -- if you like 31, run at 31 and RPM will be what they are. If the boat is more comfy at 27, run at 27. Lugging a two stroke is not good for it so do not over prop it (too much pitch).