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cal69
11-17-2010, 12:00 PM
Hi guys,

New guy here. Just bought a 1985 Stars & Stripes with a Powerslot. It does have a 1 1/8" shaft but someone put on a 13x13 propeller. I know that the stock prop should be a 14x18, but will a 14x20 4-blade fit? I'm mostly using this boat for skiing and want to get the RPM's down at 36MPH. Right now they are at 4,600!! I'm hoping to get RPM''s around 3,200-3,500 at this speed.
Anyone actually mount and use a 14x20 on a mid 80's Powerslot? I think I can get a good deal on one & that is why I am asking.

Appreciate any replies.

Thanks.

Kyle
11-17-2010, 12:28 PM
It will fit. 14 is the size and 20 is the pitch. With the higher pitch, say goodbye to the hole shot. If you are wanting rpm down on fuel consumption it's not going to be worth it. I also doubt that you have the HP to turn the 20 pitch. Rpm's will be very close to what you are wanting though. Remember you will loose your hole shot.

Talk to Eric at oj props. He will probably give you a 13.7x13.75 four blade. Rpm's with this prop will be 3,600 to 3,800. I have one and absolutely love mine.

The 13x13 is what is causing high rpm. Its garbage sell it or trade it. Only 1x1 trannys use them and they are 1" shafts. That 1 1/8" 13 x 13 will not be wanted here sorry. Someone messed up by putting that on your boat.

ski_king
11-17-2010, 12:50 PM
Assuming you have the 351/240HP, the 14x18 prop is the way to go. However Eric will give you better advise.

My boat with the same setup has the 14x18 and you can count on 3600 rpm at 36 mph.

DooSPX
11-17-2010, 09:08 PM
Talk to Eric from OJ.

Kyle and I both have a OJ 13.7x17.5. Its a great prop. on my 240hp 91, it made the boat feel like a 300hp boat.
my rpm's are at 3600 at 36mph. The factory 14x18 on our 91-94 (much more drag than your S&S) at 36mph the rpm was about 3800-3900.

the factory on the 1.52:1 trans 1 1/8 shaft is 14x18.

Jim@BAWS
11-17-2010, 10:23 PM
Hi guys,

New guy here. Just bought a 1985 Stars & Stripes with a Powerslot. It does have a 1 1/8" shaft but someone put on a 13x13 propeller. I know that the stock prop should be a 14x18, but will a 14x20 4-blade fit? I'm mostly using this boat for skiing and want to get the RPM's down at 36MPH. Right now they are at 4,600!! I'm hoping to get RPM''s around 3,200-3,500 at this speed.
Anyone actually mount and use a 14x20 on a mid 80's Powerslot? I think I can get a good deal on one & that is why I am asking.

Appreciate any replies.

Thanks.


I would ask for a little more proof here...This makes no sense at all.

13 x 13 does not have a 1 1/8 bore. I would ask you to double check everything
That motor would rev up so fast with a powerslot transmission with a 13 x 13.

You would redline that motor pretty fast!!!

Take a photo of the transmission and the prop please...only here to help

Jim@BAWS

cal69
11-18-2010, 12:07 AM
100% certain it is a Powerslot and a 1 1/8" shaft and a 13x13 prop on there now. The tag on the tranny indicates the 1.5 ratio and the shaft is 1 1/8". The motor spools up crazy fast (like under a 100 yards) and turns 4,600 RPM when I pulled a skier just after buying the boat (about a month ago). At wide open throttle, the motor hit 5,000 RPM and about 39-40 MPH. Waaaay too high of my comfort level for spinning that motor.
Was really looking for opinions on whether or not I can spin the 14x20 since I can get it at a low cost. I'm not ready to drop $400 on a new prop right now, but need to get closer to the factory size of 14x18.

FrankSchwab
11-18-2010, 01:00 AM
These boats are not short on power. I can't imagine that you're using full throttle when pulling out a skier, so the loss of hole shot that you'd get from a 14x20 just means that you'd have to give the skier more throttle (of which you should have plenty) to get the pull that they could manage.

If you can get it cheap, I'd say go for it. Worst case if it doesn't work as well as you want is you'll have to sell it on Ebay and buy the $480 prop.

/frank

Kyle
11-18-2010, 01:24 AM
These boats are not short on power. I can't imagine that you're using full throttle when pulling out a skier, so the loss of hole shot that you'd get from a 14x20 just means that you'd have to give the skier more throttle (of which you should have plenty) to get the pull that they could manage.

If you can get it cheap, I'd say go for it. Worst case if it doesn't work as well as you want is you'll have to sell it on Ebay and buy the $480 prop.

/frank

100% agree. If finances are stretched now get the 14x20 and use it until the 13.7x13.75 is in your budget. It will be a lot better than the 13x13. My engine turns close to 4,900 rpm but I am running over 300hp and have the 13.7x13.76 and I top out 46.5 on gps loaded down.

kevkan
11-18-2010, 01:51 AM
I had a 1985 Powerslot S&S, complete factory setup to my knowledge. The boat speed matched the RPMs exactly. 36 mph was at 3600 rpm. Right above 3600 rpm, the secondaries opened up. Top speed was 44 mph, regardless of load, wind, anything else.

FrankSchwab
11-18-2010, 02:12 AM
BTW, where are you at, Cal69? I've got a 14x20 in the garage that I use as a spare prop that I'm more than willing to loan you to try if you're anywhere near Phoenix.

/frank

Jim@BAWS
11-18-2010, 08:26 AM
I don think you have the ponies under there to use a 14 x 20. You may gain a MPH on the top end but that is ALOT or prop to turn for a 240 HP Motor.

Looks like you have someone local to test one out. Someone screwed up royally putting on a 13 x 13

Jim@BAWS

BrianM
11-18-2010, 10:04 AM
As said above a 13.7x17.5 OJ XMP is the way to go with that boat. I put one on an '85 I restored. Great prop.

03geetee
11-18-2010, 10:15 AM
Guys sorry to hijack the thread, but how do I verify my prop on my boat what numbers are on it and where would they be?

83 Powerslot factory prop to my knowledge.

JTR

cal69
11-18-2010, 11:41 AM
Thanks for the replies. I should have stated the only reason I'm considering the 14x20 is because I think I can get it dirt cheap. Worst case, it does not allow enough holeshot to pull my buddies up and I resell it & find a better propeller.

Frank, thanks for the offer to try out your prop. I'm in Nor Cal so I don't think that's going to work out, but I appreciate you offering.

Hopefully I can run the 14x20 for a while and upgrade to a more appropriate prop when I'm ready to drop some coin.

Jim@BAWS
11-18-2010, 03:12 PM
Thanks for the replies. I should have stated the only reason I'm considering the 14x20 is because I think I can get it dirt cheap. Worst case, it does not allow enough holeshot to pull my buddies up and I resell it & find a better propeller.

Frank, thanks for the offer to try out your prop. I'm in Nor Cal so I don't think that's going to work out, but I appreciate you offering.

Hopefully I can run the 14x20 for a while and upgrade to a more appropriate prop when I'm ready to drop some coin.


Any good prop shop can convert that prop and rebalance to a 14 x 18 w/o problem

Unless it is stainless

cal69
11-18-2010, 03:29 PM
Nope, not stainless. It is an OJ 4-blade.
Really, that can be converted to a 14x18? I'll have to find a shop and look into the cost sometime this winter. Might just be cheaper to buy a new prop. Don't know, I'm still learning this stuff.
Thanks again.

Jim@BAWS
11-18-2010, 04:55 PM
Send me the prop...I can have it done for about $219-$239 + shipping

It will come back better than new and dynamically balanced

Jim@BAWS

BrianM
11-18-2010, 07:22 PM
For $219-239 + shipping two ways you might as well sell your 13x13 and the 14X20 then buy the XMP. XMP is going to run about $400 minus say $100 for each used prop. Less than reworking.

1985 Skiier
11-21-2010, 10:13 PM
congrats, have you posted any pics?

cal69
11-29-2010, 07:38 PM
Thanks. I'll post some pics in the next few days. I'm hoping to test out the 14x20 prop I got for $50. Professionally rebuilt prop, so the price was fantastic.
Kevkan, I came across one of your older posts. It is the same color combo as the boat your just sold. Grey with black stripe with a red border. All this time I thought is was a repaint and non-factory. It is under the gelcoat, so I thought someone went to great lengths to get the stripe under the gelcoat. I've never seen this color combo on another boat until today.