mnm99
Well-Known Member
I am curious about the result also.
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I know this is an old thread, but I figured I'd update for peoples info. I'm now at 22 and 22.5 with a large .125 cup. I'm right at 4600 rpm WOT. I would love to see what 23 Acme's would do.Yes i'd like to know. I had my props re-pitched from 21 and 21.5 to 22 and 22.5 this winter. My WOT was at 4700, so now I should be around 4500, still within range.
No these are 4 bladesBut still the 3 blades?
It's a 2004, 8.1's. Yes full fuel and packed with beer and wine. I cruise at 3450 at 28.5 to 29 mph. WOT is right at 4600. This is on my garmin gps and phone. I'm trying to cruise at 30 to 31mph. If I run the rpm to 3600 I can get to 31, but I dont want to run there.So your paining 22/22.5p large cup, 4 blades to 4600 on 8.1s ?
And a 99-02 340 hull?
3700 is a little more with those motors want to be. Burning some decent fuel at that RPM. 3500 is where you really should run them. I’m running 3450 at 29 mph with these. I couldn’t justify the expense for really no gain. And they are much thinner than the Ones I have now
Those are some nice numbers.... If I run at 3500 I start to fall off plane. Do you happen to have you prop scan sheet, do you know what there pitched at... I have to get mine tuned next season or buy anther set and swap them out...
I've read all of the threads on switching from 3 to 4 blade props on the 330 / 340 size cruisers. Mine is a '02 340 DA with 6.2 V-drives (year before they switched to the new-style, wider beam 340).
I'm just about convinced to make the switch, however I need to know if my current props are cupped or not. How can I tell? The parts manual lists:
17 X 19 X 1.5 R3BLC NIBRAL
17 X 19 X 1.5 L3BLC NIBRAL
So I get that R/L=Right/Left, 3B=three blade. Does the L = light cup? What does the C mean?
The Michigan Wheel folks are recommending 17x18 4 blade DQX with MEDIUM cup assuming my current props have a medium cup because I am currently hitting 5000 RPM with the stock 3 blades.
The Acme sales engineer recommended a 17x16 4 blade with .075" cup, which seems like way too much of pitch change. It seems Acme does not make a 17x18 4 blade with a 1.5" bore.
I've read all of the threads on switching from 3 to 4 blade props on the 330 / 340 size cruisers. Mine is a '02 340 DA with 6.2 V-drives (year before they switched to the new-style, wider beam 340).
I'm just about convinced to make the switch, however I need to know if my current props are cupped or not. How can I tell? The parts manual lists:
17 X 19 X 1.5 R3BLC NIBRAL
17 X 19 X 1.5 L3BLC NIBRAL
So I get that R/L=Right/Left, 3B=three blade. Does the L = light cup? What does the C mean?
The Michigan Wheel folks are recommending 17x18 4 blade DQX with MEDIUM cup assuming my current props have a medium cup because I am currently hitting 5000 RPM with the stock 3 blades.
The Acme sales engineer recommended a 17x16 4 blade with .075" cup, which seems like way too much of pitch change. It seems Acme does not make a 17x18 4 blade with a 1.5" bore.