Props

[008moombalsv]

Looking for a good prop for surfing I only have 2500lbs of ballast and I have a 15x12.5 right now a 2775 I believe. Kinda sounds like overkill for not having a lot of weight. I’ve been looking at the acme 1433 but hearing good and bad things about it.

[KnoxMojo]

Looking for a good prop for surfing I only have 2500lbs of ballast and I have a 15x12.5 right now a 2775 I believe. Kinda sounds like overkill for not having a lot of weight. I’ve been looking at the acme 1433 but hearing good and bad things about it.


You could probably go to the ACME 1235 and be really happy, as well as a 15x13 or 15x14....if you decide to sell the 15x12.5, I could put it to use on my boat.

[008moombalsv]

You could probably go to the ACME 1235 and be really happy, as well as a 15x13 or 15x14....if you decide to sell the 15x12.5, I could put it to use on my boat.

Thanks I’ll probably try and get it fixed and keep it as my spare!

[KnoxMojo]

Thanks I’ll probably try and get it fixed and keep it as my spare!

Right on, I would get something bigger than the 1433..maybe find someone selling their stock OJ 14.25x14.5, but the ACME 1235 would perform very well on your boat.

[Stazi]

I have my stock 14.5x14.25 that I would trade with you for your 15x12.5.

Let me know. Send me a PM.


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[Ryann]

Depends on your boat. Have you considered a 15.5” or 16” diameter prop? I don’t know your prop clearance, but going bigger could be the best of both worlds.
My 2775 works great on my SL, but too end sucks. I still want to go up in size.

[Prospersigman]

I have the Acme 2247 (15.0x14.25) on my SL550 and I would love a recommendation to lower my surf rpms. Currently with 4 adults and 3 (9-12 year old kids) I turn 3500-3600 rpms with the addtional 850 lbs of lead I run. That 550 is thirsty so I would love to lower rpms so I burn less premium fuel. I could care less about top end, but currently with the Acme 2247 it will hit 44-45 mph with 7 people on board...I'll bet I could get close to 50 mph with just me in the boat on a smooth morning run.

[larry_arizona]

I have the Acme 2247 (15.0x14.25) on my SL550 and I would love a recommendation to lower my surf rpms. Currently with 4 adults and 3 (9-12 year old kids) I turn 3500-3600 rpms with the addtional 850 lbs of lead I run. That 550 is thirsty so I would love to lower rpms so I burn less premium fuel. I could care less about top end, but currently with the Acme 2247 it will hit 44-45 mph with 7 people on board...I'll bet I could get close to 50 mph with just me in the boat on a smooth morning run.

You need the prop that they run the pro wake tour SA 550.


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[sandm]

You could probably go to the ACME 1235 and be really happy

this. it has been my go to for several boats. woke my supra right up from the crappy OJ that was on it.....
both of my prior boats and current are running it.

[Prospersigman]

The pro wake tour or the pro surf tour? What prop is it that they run? We don't long line at all anymore so just looking to turn lower rpms and save 93 octane fuel burn.


You need the prop that they run the pro wake tour SA 550.


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[KnoxMojo]

this. it has been my go to for several boats. woke my supra right up from the crappy OJ that was on it.....
both of my prior boats and current are running it.


OJ props aren't crappy, it just wasn't the right prop for your application.

[KnoxMojo]

The pro wake tour or the pro surf tour? What prop is it that they run? We don't long line at all anymore so just looking to turn lower rpms and save 93 octane fuel burn.

Pretty sure it's a 15x12 or 15x12.5.

[sandm]

OJ props aren't crappy, it just wasn't the right prop for your application.

respectfully disagree on this. there are a lot of documented cases on here on the older supra/moomba rides that were using oj props and getting a growl. I had it with the stock oj prop on my supra. it all went away with acme. dozens of members on here back in the late 00's had the same issue.

granted one could point back that it was not the right prop for the boat but interesting that it was across several boat hulls and all went away when they switched to acme.

I'll change my stance: oj was not the right choice for older skiers boats and left a bad taste that personally would not recommend them to anyone :)

[KnoxMojo]

respectfully disagree on this. there are a lot of documented cases on here on the older supra/moomba rides that were using oj props and getting a growl. I had it with the stock oj prop on my supra. it all went away with acme. dozens of members on here back in the late 00's had the same issue.

granted one could point back that it was not the right prop for the boat but interesting that it was across several boat hulls and all went away when they switched to acme.

I'll change my stance: oj was not the right choice for older skiers boats and left a bad taste that personally would not recommend them to anyone :)

That's your choice to not like them. I know Eric personally and he does a phenomenal job. Their designs have come a long way and they've been great on our Mojo and now SA. But to each their own. That's why there are different companies.

[Stazi]

Pretty sure it's a 15x12 or 15x12.5.

The SE 550’s run a 15x12.


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[Prospersigman]

Okay, since I don't know spit about props...explain to me the difference between my 15.0x14.25 and a 15.0x12.0?

I was hoping I could bump up to a 16" prop but I guess the drive shaft angle is not enough to clear a bigger prop?

[larry_arizona]

Example: 15x12.5

15 in diameter prop and 12.5 pitch means one rotation theoretically will move the boat 12.5”

The lower the pitch the more low end grunt it will have but will reduce top speed.


Supras can take a 16” prop and your 550 has the torque to turn it. But I can’t recommend a prop pitch for you in a 16”

The 2020 Supra 400 and 450’s will run a 16x17 with the new 1.76 transmission


The recommended 550 wake prop is the one you got 15x14.25

However, others have said the prowake tour 550SA ran the 2775 15x12.5 and that boat was full ballast plus 6 crew plus 500# lead


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[KnoxMojo]

Not all Supra boats can run a 16" prop. The 1.5-1 transmission tops out at 15". The newer 1.76-1 can run a 16". The 550 engine is still 1.5-1 at this time, so 15" is the biggest. I personally like the 15x13 props. Gives a good mix of low end and some decent cruising and wakeboard speed sand rpms.

[Stazi]

Yep. I bet an OJ 945 would be perfect. That’s what I run on my Craz.


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[Ryann]

Not all Supra boats can run a 16" prop. The 1.5-1 transmission tops out at 15". The newer 1.76-1 can run a 16". The 550 engine is still 1.5-1 at this time, so 15" is the biggest. I personally like the 15x13 props. Gives a good mix of low end and some decent cruising and wakeboard speed sand rpms.

Not sure where you’re getting your information.

Have you measure the prop clearance on the Supra with 1.5:1 transmission? Mine has 1.5” of clearance with a 15” diameter prop.. 2020 didn’t change prop angles or even the shaft diameter. There’s no problem going to a 15.5 or 16” diameter prop. .5” of clearance is all you need.

[PuraVida]

I just switched back to a 15x13 on a mojo with a 400 from a 14.5x12 (acme 2079). I couldn't be happier. Lowered my surf rpms and allowed me to surf faster. I was running 10.8mph at 3900rpm now I go 11.1mph @ 3500rpm with a harder/longer port wave. Note: these are skim speeds, surf style speeds are faster for better airs.

The engine seems happiest below 3500rpm but that is just my opinion.

[PuraVida]

I should also mention, neither prop got my boat on plane with full ballast and a small crew so I opted for the lower surf rpms. Ballast = 4200lbs water, 650lbs lead

[KnoxMojo]

Not sure where you’re getting your information.

Have you measure the prop clearance on the Supra with 1.5:1 transmission? Mine has 1.5” of clearance with a 15” diameter prop.. 2020 didn’t change prop angles or even the shaft diameter. There’s no problem going to a 15.5 or 16” diameter prop. .5” of clearance is all you need.

Go ahead, let me know how that prop burn treats ya... I'll listen to the engineers at Skiers Choice that I personally know and Eric at over at OJ...0 prop guides out there recommend over 15" for the 1.5 transmission, but you can run a 16" with edge 1.76.

[larry_arizona]

Go ahead, let me know how that prop burn treats ya... I'll listen to the engineers at Skiers Choice that I personally know and Eric at over at OJ...0 prop guides out there recommend over 15" for the 1.5 transmission, but you can run a 16" with edge 1.76.

Good info, this says the shaft angle must have changed on the 1.76.


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[KnoxMojo]

Good info, this says the shaft angle must have changed on the 1.76.


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The blower motor for 2020 is still 1.5.. the rest of the 20s are 1.76.. only 19s with 1.76 are the later 450s. All 18 and below are 1.5.

[MJHSupra]

^^ Drew Tinker has been updating people on Facebook with this same info ^^

The mid-year 2019 still throws people off with the 450 and 1.76.


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[larry_arizona]

It’s possible the 2020 Supra’s with the 1.76 utilize a longer driveshaft to gain more prop clearance to the hull.

Maybe that is the limiting factor in the 2018’s to not fit a 16” prop??


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[KnoxMojo]

Longer shaft or different angle

[z28ke]

Question for you guys:

I have the OJ 945 (15x13) on my 2018 Max 400 and on really hot days when fully loaded with a big crew she struggles a bit to sustain anything over 11mph surfing. I’ll turn on the blower to help keep air circulating through the engine compartment but it’s basically running WOT at about 4000 rpm.

I’m not concerned with top speed, so long as we can cruise at 25mph. I’m considering the acme 2419 (15x12) which wakemakers has as the heavily weighted/high elevation prop. I would also like to lower surf rpm, which leads us to my question.

Going to a 15x12 will theoretically increase my rpm at any given speed (including surf speeds) but given we are dealing with water, it’s not going to be linear like differential gears in a car. Is it possible the 15x12 could lower my surf rpm due to reduced “prop slip”?

Thank you for your insight and experience!

[Stazi]

Yes. The engine will probably be “working” less with the 15x12 and you will probably see a drop in rpms to attain the same speed with less prop slip.


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[schwan]

If you don't care about going over 25 mph, you will like the 15x12 prop, we do. It was a worthwhile investment, but I had the stock prop on 15x14.5 or something like that, it struggled with anything over stock ballast.

[Stazi]

If you get a 15x12 with a good amount of cup it won’t take much away from the top end. The 2315 is a good candidate.


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[z28ke]

Thank you guys for the feedback. My fuel consumption is terrible currently so I figure it’ll pay for itself over the long term. Thanks again!

[Stazi]

Yeah once you hit 4000rpms, it’s guzzling. My buddies Malibu does 4200 and it’s unbelievable how much gas it uses. The wedge make a great wave but the engine works it’s balls of against it and the bow rise is insane.


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[larry_arizona]

My SA 400 has a 15x12.5 and runs 38 mph WOT

Haven’t found its limit yet surfing.

Runs 3500-3600 surfing 11mph


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[zabooda]

My SA 400 has a 15x12.5 and runs 38 mph WOT

Haven’t found its limit yet surfing.

Runs 3500-3600 surfing 11mph


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You have your boat set nice. 38 isn't that much slower than the DDs.

[z28ke]

I’m going to call acme next week and see what they recommend, first I need to verify that I do indeed have the OJ945. I ordered the boat with it but haven’t actually verified yet.

I’ll report back what they recommend for my setup.

[larry_arizona]

Today ran full 3500 stock ballast plus 3 crew (650#) plus 500# lead wake, plus full 65 gallon fuel load

3600-3700 rpm surfing at 11mph.




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[larry_arizona]

The one thing that can really effect engine output is density altitude aka DA.

Your effective altitude can vary thousands of feet each day.


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[larry_arizona]

The one thing that can really effect engine output is density altitude aka DA.

Your effective altitude can vary thousands of feet each day.


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For example

https://uploads.tapatalk-cdn.com/20190825/07339b1f6649f51c1a936baa9d92550d.jpg


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[DNIXD99]

I’m going to call acme next week and see what they recommend, first I need to verify that I do indeed have the OJ945. I ordered the boat with it but haven’t actually verified yet.

I’ll report back what they recommend for my setup.

Let us know where you end up. Im considering changing the prop too.

[trayson]

If any of you that are upgrading props had the Acme 1235 as your OEM prop, let. me know. I just upgraded from the Acme 537 to the 1235 and liked the 1235 enough that I'm gonna sell off my 537's I have laying around and just have the pair of 1235's...