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what prop to buy?

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    Posted: July-09-2019 at 5:53pm
Hey guys...So I've decided that I want to get a second prop for my 93 SN.   I will keep the original prop thats on it currently as a spare. It's got a few little nicks and dings, so may get those fixed on it, after I swap them out.

Anyway, my engine is: PRP-PR-R10   and my transmission is the 1:1

I am attaching a pic of what is currently on the boat. Is this NOT a right hand prop?? or am I mistaken? Just want to be sure to order correctly. Props are so confusing.

Also, should I look at a 3 blade, or 4 blade? I am looking for a bit better Hole shot.

(photo of my current prop)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: July-09-2019 at 6:10pm
Dan,
First, that is a RH prop. It turns clockwise to propel the boat forward. I and I believe others will recommend the Acme 540.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote dgabler Quote  Post ReplyReply Direct Link To This Post Posted: July-09-2019 at 6:15pm
https://acmemarine.com/pages/custom-fit was spot on for my needs.

[edit to add]
On my 88 I put a ACME 540 3 Blade 13" X 12"   WOW what a difference compared to the stock Federal prop (13RH13) Great out of the hole, max speed is down a bit to ~45 +/- Gulps gas at WOT so rarely up there. Highly responsive.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-09-2019 at 7:49pm
Yeah...my current WOT speed is around 45 + or -. with the current old 4 blade on it. I wouldn't mind dropping a few MPH's for some really good "out of the hole" pull.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-09-2019 at 8:11pm
DGabler....I don't think a 540, 3 blade on my boat would be any good. With the 285hp engine, and the pitch on that prop, it would put my RPM's well above the recommended 5000rpms.   

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Post Options Post Options   Thanks (0) Thanks(0)   Quote zwoobah Quote  Post ReplyReply Direct Link To This Post Posted: July-10-2019 at 12:15am
Not sure which prop would be best for your boat, but I'd certainly recommend an Acme. Just put an Acme 1214 12.5x13 on my 16' Mustang and it has substantially improved the boat. Previously had a Federal 13x13. The new prop pulls out of the hole harder, porpoises a bit less, keeps the engine turning a lower max rpm, and actually increased top speed. Evidently prop design has improved a lot in the past 40 years.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: July-10-2019 at 9:10am
Originally posted by flyweed flyweed wrote:

DGabler....I don't think a 540, 3 blade on my boat would be any good. With the 285hp engine, and the pitch on that prop, it would put my RPM's well above the recommended 5000rpms.   


Not sure how you got there.

540 would be the right place to start. Could potentially benefit from a 542.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-10-2019 at 1:04pm
TR...I'll give the 540 a go then. My 351HO, WITH 1;1 trans would be a good match with it you think??

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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: July-10-2019 at 1:26pm
Originally posted by TRBenj TRBenj wrote:


540 would be the right place to start. Could potentially benefit from a 542.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-10-2019 at 2:18pm
Tim. I appreciate your help. I've ordered an ACME 540 for $349.99 from Wavemakers. Seems to be a pretty good price.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: July-10-2019 at 2:36pm
$345 with free shipping from Delta... a CCFan site sponsor.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-10-2019 at 3:50pm
Tim

Perfect, I changed my order over to Delta...Total with OUR forum discount and free shipping came to $336.00

Can't beat that, and they are a site sponsor. So happy to support them.


Dan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-10-2019 at 8:39pm
Well...got the 540 prop on order from Delta, and went to NAPA and picked up some Prussian Blue and valve grinding compound. Can't wait to get a new prop on!!

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Post Options Post Options   Thanks (1) Thanks(1)   Quote dgabler Quote  Post ReplyReply Direct Link To This Post Posted: July-10-2019 at 9:03pm
If you want some Time Saver's Yellow I bought a 1# can I am happy to send you a bit, PM me your address. I went with Time Savers vs permatex as it is non-embedding. Not sure how much of an issue it truly is.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2019 at 4:17pm
Oh boy......Got my new "toy" from UPS today. Can't wait to get this on and try it out.



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fabcon Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2019 at 4:27pm
The 540 is a nice prop, I run that on my 76SN and love it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GottaSki Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2019 at 5:04pm
For posterity, if you could take a picture of your wake from the stern of the boat at 30mph with the old prop and new prop, i would be most interested in seeing that.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2019 at 9:38pm
GottaSki

I'll do that....We ran home for the weekend, once we get back "up north"   I'll take it out and shoot some photos of the wake with the old 4 blade..then once I get the new 540 on, I'll do the same thing, and POST back here.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-16-2019 at 5:42pm
Originally posted by GottaSki GottaSki wrote:

For posterity, if you could take a picture of your wake from the stern of the boat at 30mph with the old prop and new prop, i would be most interested in seeing that.


GottaSki - I took the boat out this morning with my two boys..and here is the photo of the wake at 30 mph, on the prop that the boat came with. (an O.J. 608) 4 blade.


Original Prop that came with my boat

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Post Options Post Options   Thanks (0) Thanks(0)   Quote GottaSki Quote  Post ReplyReply Direct Link To This Post Posted: July-16-2019 at 9:38pm
Awesome, looking forward to seeing it afterwards!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-17-2019 at 5:51pm
Got my new 540 installed this morning.
I think the old O.J. 680 MUST have been on this boat as OEM.

The new 540 was installed the same as the 680....two Nuts, and NO cotter pin. There wasn't even a hole in the shaft that I saw.   Was this ever common?? I see most with a thin nut, thick nut and cotter, pin...mine just has two thicker nuts. Again, it's the way it came when I got it.

Anyway, here is a pic of the new 540 on. Ready to test out tonight on the lake.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote phatsat67 Quote  Post ReplyReply Direct Link To This Post Posted: July-17-2019 at 6:11pm
Looks hot.

No, that shaft has been replaced. CC always used a castle nut with a cotter pin up until the early 2000s or so when they went to a nylock but that also still employed an emergency cotter pin stuck through the end of the shaft,

Also, an Acme 13" always tends to be a little larger in diameter of another 13" propeller. Give it a spin and make sure it doesn't contact your prop guard just for good measure.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: July-17-2019 at 6:21pm
Flyweed

Here's a little discussion in the link to maybe expand your nut knowledge whether you have 2 or just 1


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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-18-2019 at 6:22pm
Originally posted by GottaSki GottaSki wrote:

Awesome, looking forward to seeing it afterwards!


GottaSKi.....All I can say is WOW. this new Acme 540 has "awoke" the beast in my 93 S.N.

Engine is out of the hole like no tomorrow, and there is NO vibration at all in the drive from idle, on up to W.O.T.

I LOVE it. I am going to send my OJ 680 in to be refurbished, as it'll be kept as a "spare" if i ever need it.

Here's a PIC of the boat at 30 MPH with the 540. My kids said there is a noticeable difference when skiing in the wake.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote dgabler Quote  Post ReplyReply Direct Link To This Post Posted: July-18-2019 at 6:45pm
I agree that the ACME 540 is quite nice. your top end RPM is ok?

Where are you sending the OJ to get tuned?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-19-2019 at 12:33am
top end RPM was quite a bit lower than my old OJ. I was reading 4600 give or take a few at WOT.   

probably take it just north of us here to a prop shop that does them.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: July-19-2019 at 9:19am
What did the gps say? Either your tach is off or you’re missing 200-400rpm somewhere.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GottaSki Quote  Post ReplyReply Direct Link To This Post Posted: July-19-2019 at 10:49am
Thank you for the pictures!
Seems to be somewhat less frothing in the middle, and roost stayed nicely in control.

It would be cool if we each contributed to a library reference thread of wake images for all assorted boats; post model, year, engine, loading, speed, line length if applicable. sure add Top speed/rpm and general satisfaction. I find just speaking top speed and rpm alone to be missing part of the story.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flyweed Quote  Post ReplyReply Direct Link To This Post Posted: July-19-2019 at 4:24pm
Originally posted by TRBenj TRBenj wrote:

What did the gps say? Either your tach is off or you’re missing 200-400rpm somewhere.


I am going to take it out tonight (if storms stay away) and check again. I did have 5 people in the boat when I checked, and didn't GPS it either...... I just had glanced at the RPM's once while running a WOT, so I'll pay more attention and report back.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote zwoobah Quote  Post ReplyReply Direct Link To This Post Posted: July-20-2019 at 10:45am
My top end RPM also dropped with the Acme prop vs my old Federal.

With the Federal I was turning 4,900rpm at 43mph

The Acme turns 4,500 at 48mph
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