Volvo 4.3 SX

[sledgie]

First off, hello all.

I have a issue that I hope can be resolved here.
I have A 2001 Glastron GX185 w/4.3 Volvo SX.\
The Stock prop 23 pitch 14 1/4" 3 blade aluminum.
max RPM 4800, top speed around 48-50.
I wanted better stability at lower RPM's so I bought a 4 blade stainless
max RPM is now 4100, top speed is about the same 48-50. It's 24 pitch 14 1/4".

I knew my RPM's would be lower but not that much. I added a inch of pitch to maintain top speed, that seemed to work.
Am I OK with the new top RPM being so much lower?
Isn't this bad for the motor? If so, is there anything I can do outside of forking out another $350 for a new prop?

 

[WillyBWright]

Re: Volvo 4.3 SX

It can be repitched an inch lower by a prop shop. As a general rule, you drop an inch going from 3-blades to four to account for the increased load of the fourth blade.

 

[Tail_Gunner]

Re: Volvo 4.3 SX

First off, hello all.

I have a issue that I hope can be resolved here.
I have A 2001 Glastron GX185 w/4.3 Volvo SX.\
The Stock prop 23 pitch 14 1/4" 3 blade aluminum.
max RPM 4800, top speed around 48-50.
I wanted better stability at lower RPM's so I bought a 4 blade stainless
max RPM is now 4100, top speed is about the same 48-50. It's 24 pitch 14 1/4".

I knew my RPM's would be lower but not that much. I added a inch of pitch to maintain top speed, that seemed to work.
Am I OK with the new top RPM being so much lower?
Isn't this bad for the motor? If so, is there anything I can do outside of forking out another $350 for a new prop?

You are lugging you motor and that is NOT a good thing, If it were me i would contact the vendor and see if they would allow you pay a exchange fee for perhap's a 20- 21 pitch,

If i read this right you lost 700 rpm going up 1 pitch. so using the same brand or style of prop a 21 or 20 pitch if avaible should get you right there. Want some more opionion's on the motor running at that rpm go to I/O's and ask the question..