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09-04-2007, 02:41 PM #1Member
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I could use some help on prop selection
I bought a 1988 21 foot Celebrity bowrider. It has a 4.3 175 hp alpha 1 drive. running at 4000 rpm range.Any prop ideas?
Thanks
NelsonLast edited by nelson1100; 01-12-2008 at 05:57 PM.
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09-04-2007, 03:19 PM #27000 RPM
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need more info. what do you have now what speed.
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09-04-2007, 07:07 PM #35000 RPM
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Depends on $, not quite cubic $, but enough.
Assuming that you're still running the stock alum prop, you can upgrade to stainless, depending on the brand, and outlet, average 400
I haven't tried a ported prop on an I/O, some ported props come with removable plugs, you could try it with and without, see if it improves your holeshot.
The other improvement is to replace that 2 barrel carb with the Q-Jet intake and carb used on another model Merc 4.3
Should be available at a marine salvage/recycler
Possibly better milage at minimum cruising speed with Q-jet's smaller primaries/higher air velosity at part throttle.
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09-05-2007, 07:14 AM #45000 RPM
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I set one of these up years back.....
...had good top end but no hole shot, even pulling one skier was near impossible. The fix was to swap to a Land and Sea Torque Shift variable pitch prop- top end remained the same, but the boat could now easily pull up 2 skiers with 3 people in the boat. The bad news is that the prop isn't available anymore and was a PIA to get working right.
Doug
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09-09-2007, 11:57 AM #5
I think I still have a quicksilver torque shift prop.
Let me know if you are interested.