DaFish
Active Member
- Mar 11, 2011
- 663
- Boat Info
- 1999 370 DA
- Engines
- 7.4 MPI Horizon Merc w/ V-Drives
Hi Gene,
Your original prop size is interesting. Mine are 18x21 three blades which is what is listed in the Sea Ray 1996 parts manual. I cant say that I can complain about the overall performance but we always could do better...lol My top end loaded with fuel in calm waters is about 34 mph. The torque around the docks could be better, although I am used to how it handles now and compensate with a little more throttle when needed.
If I were to go to a 4 blade would you think I would still be at 18" but I would drop down to 20"?? (Using your rule of thumb listed in an earlier post)
Thanks
Bill
According to my parts manual, the 18 x 21" props were specs for the smaller gas engine (310 hp) and the 18 x 22" were spec for the larger gas engine (380 hp). They also list 20 x 25" for diesel.