RCAnderson
Seaman
- Joined
- Oct 5, 2011
- Messages
- 68
Howdy all, I need to get approx 300 more rpm out of my engine to meet the WOT specs for my engine.
Engine - Mercruiser 888 (ford 302)
Leg - MC-1 with I believe a 1.65 to 1 ratio (someone who knows for sure please correct me if I"m wrong)
Current WOT - 3650 rpm verified with digital tach
Design WOT - 3800-4000 rpm
Max boat speed - difficult to determine because of the currents around here, but say 30 mph
Boat - older Zeta, 24 feet, weight is HEAVY (5\8 thick fiberglass, no foam) deep V hull, I suspect about 6500 lbs
Current Prop - 16x16 3 blade aluminum
Talking with one of the prop shop guys here, he's going to re-pitch my prop to 14" pitch. I have a spare prop that came with the boat, and is a 14.25 x 17.
What will the boats performance be like if I go ahead and re-pitch to 14" ? I suspect better hole shot, and my cruise speed\max speed will be different, and my fuel usage will change as well, but by how much. I don't really want to be cruising at only 20 mph (current cruise is about 26-27 mph @ 3300 rpm). What speed should I expect with 14 pitch running the engine at approx 3400 ?
Thanks
Engine - Mercruiser 888 (ford 302)
Leg - MC-1 with I believe a 1.65 to 1 ratio (someone who knows for sure please correct me if I"m wrong)
Current WOT - 3650 rpm verified with digital tach
Design WOT - 3800-4000 rpm
Max boat speed - difficult to determine because of the currents around here, but say 30 mph
Boat - older Zeta, 24 feet, weight is HEAVY (5\8 thick fiberglass, no foam) deep V hull, I suspect about 6500 lbs
Current Prop - 16x16 3 blade aluminum
Talking with one of the prop shop guys here, he's going to re-pitch my prop to 14" pitch. I have a spare prop that came with the boat, and is a 14.25 x 17.
What will the boats performance be like if I go ahead and re-pitch to 14" ? I suspect better hole shot, and my cruise speed\max speed will be different, and my fuel usage will change as well, but by how much. I don't really want to be cruising at only 20 mph (current cruise is about 26-27 mph @ 3300 rpm). What speed should I expect with 14 pitch running the engine at approx 3400 ?
Thanks