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I have looked at many forum responses and used ACME website tool to find best prop for my boat. I only run the stock ballast tanks in the back and 350 in the center locker. I see most people recommend 644, 856 and ACME recommends the 1630. Anyone have any suggestions what would be best? Have the GT40 engine and mostly surf/wakeboard. Thanks guys!
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my 01 SAN had a 14x18 from the factory. got rid of it quick.
I then ran an OJ 14x16 for a few years. Great prop. I bought it direct from them. I didnt like that ACME didn't have a 14" in the size i wanted. I recently upgraded to a acme 1846, but it's pretty aggressive. i run 2400# of ballast and needed it. I only changed because the OJ got damaged. not sure if this help your decision. you might call OJ though just for options. -
on a 2nd look, acme has come out with a lot more props in the last few year for reverse rotation, if i were you i'd go with the 1590. i dont think WM's prop guide has been updated for the new options out there. just make sure you can fit the 14". Like i said, mine had a 14" from factory.Comment
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Thanks for the reply! I actually just got off the phone with the guys at Acme and they recommend that I go with the 1578. I think ill give this prop a try unless anyways has any huge reservations as to why not! Thanks!Originally posted by Rusty Barras View PostComment
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try it out... the 1578 is just as aggressive as my 1846, yours might tac up a little quicker. note, my boat wont do over 40mph now, but i dont need top end. for your ballast i'm surprised that's what they recommended. others can chime in. give the post a day or two.Comment
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Ya I have no clue... I dont understand the prop stuff (pitch/rack) so I decided to just call them up and ask what they would use. I dont need to go 40... 30 would suffice for my usage I could also set my PP to 4k RPM as not to tach the engine too much if i need to get somehwere faster I guessComment
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I’m no fan of the 1578... I put it on last year and here is my issues with it. I noticed that when unloaded and cruising 25+ mph the boat leaned on one side more when on plane. Just as if it was farther out of the water. If I was alone I’d have to shift my weight over to get the boat even keeled. Also noticed a lot of spray when surfing port side. Never had people good enough to comment on stbd side.
Im ordering an 856 for this season. Should be a happy medium. I do a lot of runs for beer or calm water that are many kilometers down river, so I still need speed with lower RPM’s but a prop that can get the pig moving when loaded with ballast.
I commented on this prop in last summers post about my fail at surf tabs.
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What would be the difference between the 856 and 1630? leaning to one side when under weight doesnt sound like funOriginally posted by N8Syncro View PostComment
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Big difference. Just from the specs on the acme website the 1630 is close to the 1578. All the specs are the same except for the cup, 1578=.105 and 1680=.150. The 856 is 1/4” smaller diameter, a pitch difference of 1.25 and a cup of .060.
A lot of numbers but if you google what each variable does to a prop I’m sure there’s a video.
Everyone has different needs and taste on the water. My 1578 was an open box so there are people than me that don’t like them.Comment
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Thank you for the comment! Since I do not have a crazy heavy ballast the 856 might be a better option as well!Comment
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It’s funny you say this because I’ve been experiencing something very similar with my 856, I know I ate good this winter but it definitely leans to the drivers side more.Originally posted by N8Syncro View PostComment
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Man this gets complicated! Most people say to go with the 1578... then a fewer for the 856
Sent from my iPhone using PLT NautiqueComment
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I’ve only owned the 856 so I can’t give an honest opinion on the other. My other complaint is I don’t like the high pitch whistle I get from the cnc cut prop compared to the castComment
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I have an acme 1464 which is the same spec as the 1578 and run heavy (2400+ ballast). I noticed a slight right lean this last weekend when unweighted but have been happy with the prop. Considering getting the 1234 for a spare as my 1464 needs reconditioning. I’ve heard great things about it and it’s a little bigger and lower pitch so it might be a little better yet for heavy weight. KyleComment
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I am running a 536 which is a 13.5 x 16. This is the stock team edition prop. I believe the non team boats came with an 18” pitch prop.
I have never had an issue with hole shot performance, but I can easily hit the rev limiter on top speed.
I have also had the prop reworked several times after getting too cozy with shallow water. All encounters have been at slow docking speeds.
When I had it reworked the first time I had them add some additional cup. This made the prop perfect. Great hole shot and good top speed. I think I get about 42 - 44 mph top speed. About perfect for my bare footing.
the diameter is just that, the physical diameter of the prop. Bigger equals more blade surface area and in theory less slippage. But too big a prop and you will over load the engine and it won’t be able to turn it. Too small and it will slip excessively, over rev the engine and not move the boat.
pitch is the angle of the blade and is measured in inches per revolution. This assumes no slippage, so for each rotation the boat should go forward 16”. But we don’t live in an ideal world and we don’t get the full 16” from the pitch.
cup is a lip in the trailing edge of the prop. It helps increase the efficiency of the prop and give the water an extra shove, effectively adding pitch. Now there is not much benefit at slow speeds, the cup does not do as much, but at higher speeds you get more boost. This allows you to run a more aggressive pitch (lower number) for hole shot and still have good top end. There is a limit to what you can gain, so you need to find a good balance.
prop selection is an art and science because many variables are involved. Boat weight, engine torque, desired speed, desired acceleration, etc...Comment
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