First off I'd like to say I'm new to the forum as a member but have been lurking for a while now.
Info: 1990 sea ray 170 bow cruiser 4.3, alpha one, 21 pitch stiletto stainless prop with a monster tower aluminum wake tower. New plugs (champion), wires, dizzy cap, rotor button (all quicksilver, correct for my engine). Both fuel filters have been replaced and new fuel lines from the tank to the pump (mechanical). Previous owner claims carb is on second season of rebuild. (Who knows really but boat runs/revs really well)
At WOT my boat will only turn about 3000-3200 rpm. The tach cover is broken and moves so that's why I'm unsure of exact rpm but that's close. Gps and factory speedo shows speed at about 33-34 mph with about 400 lbs (not counting the tower which I assume doesn't weigh much) of weight in boat and is slow to plane out. The prop is a 3 blade stiletto 21 pitch stainless prop. Not entirely sure of the diameter but I can go measure it if I need to. I would assume somewhere around 14". I have done quite about of reading on this forum and others and have determined my top speed or WOT RPM should not be this low with this setup. Can anyone steer me in the right direction to get this boat back right? I don't particularly want to go fast, but I would like to yank skiers and boarders up out of the water faster. I know stepping down to a 18 or 19 pitch prop would help there but I think there is also another problem here besides the prop that's causing the rpms to be so low.
Info: 1990 sea ray 170 bow cruiser 4.3, alpha one, 21 pitch stiletto stainless prop with a monster tower aluminum wake tower. New plugs (champion), wires, dizzy cap, rotor button (all quicksilver, correct for my engine). Both fuel filters have been replaced and new fuel lines from the tank to the pump (mechanical). Previous owner claims carb is on second season of rebuild. (Who knows really but boat runs/revs really well)
At WOT my boat will only turn about 3000-3200 rpm. The tach cover is broken and moves so that's why I'm unsure of exact rpm but that's close. Gps and factory speedo shows speed at about 33-34 mph with about 400 lbs (not counting the tower which I assume doesn't weigh much) of weight in boat and is slow to plane out. The prop is a 3 blade stiletto 21 pitch stainless prop. Not entirely sure of the diameter but I can go measure it if I need to. I would assume somewhere around 14". I have done quite about of reading on this forum and others and have determined my top speed or WOT RPM should not be this low with this setup. Can anyone steer me in the right direction to get this boat back right? I don't particularly want to go fast, but I would like to yank skiers and boarders up out of the water faster. I know stepping down to a 18 or 19 pitch prop would help there but I think there is also another problem here besides the prop that's causing the rpms to be so low.
