Props

[SCBlue55]

This is my First Thread here so please do not shoot me. I have looked through a couple of Pages and I am unable to find any discussion on my Size Boat.<br /><br />I recently bought a 1967 16 Foot Boat with a 120 HP Mercruiser stern Drive.<br /><br />I want to learn about Props. I am going to use this boat for waterskiing and fishing! I am trying to find as much info as possible!<br /><br />Any Help?<br /><br />Oh and I live in San Diego, so it will be seeing both fresh and Salt water!<br /><br />I know about the flushing and all that, this is my second Boat!

 

[ob]

Re: Props

SCBlue55,visit the FAQ forums here at iboats and there is some good info on prop selection.

 

[Spidybot]

Re: Props

Feel free to get the booklet from my homepage.<br /><br />Really infomative on props & more. Copyrights by Quicksilver.

 

[SCBlue55]

Re: Props

Thanks for all the help guys!

 

[SCBlue55]

Re: Props

Where on the prop is the Part Number?

 

[ob]

Re: Props

Look on the hub and if not there look on the prop barrel.

 

[SCBlue55]

Re: Props

Okay I finally got the Time to pull my Prop. On the Hub are the Numbers <br /><br />PD 4879572A4 17P<br /><br />Now while I was shopping I noticed that there are 14 1/2 15.0 and 14.0 Props, what is the Difference?<br /><br />My Engine is Taching out 4800, and I would like to get a little better in the Speed Dept, but I am also wanting some better Holeshot action.<br /><br />The Prop I have right now is nicked up a Little so I am going to replace it.<br /><br />Am I asking for to much?

 

[SCBlue55]

Re: Props

Okay I went back and learned that I have a 14.0 17P Prop. I am learning. IF I went to a 14.5 19P Prop, would I get better Speed and Pulling Power?

 

[gss036]

Re: Props

You need to go down for better hole shot. Sounds like you are a little over propped already. I would think you want a top end RPM around 5000-5500.<br />I've got a spare alum one I am trying to sell, it is a Michigan Wheel 15 1/4 X 15. Suppose to fit 1983 up Merc,don't know if it will fit your 120 Merc or not. The number on the box says it is compatable with 48-78116A4 merc number. I am thinking maybe 150-300 HP's engines. I used it for a spare om my 200HP Merc.<br />OPPS! Sorry about that, I was thinking outboard, not sterndrive.Thanks for catching it LubeDude

 

[SCBlue55]

Re: Props

Okay, If I need to go down, would that be in the pitch or the diameter?<br /><br />So if I am over propped, a 13.50 X 15 P would be better?

 

[LubeDude]

Re: Props

OOPS!!

 

[LubeDude]

Re: Props

Originally posted by SCBlue55:<br /> <br />I recently bought a 1967 16 Foot Boat with a 120 HP Mercruiser stern Drive.

Because we are talking about a stern drive, you are not over propped. You are actually about dialed in. If you want a better hole shot, I would go to a 15P four blade stainless. You might even gain a little in the top end department.

 

[SCBlue55]

Re: Props

Okay thanks for that info, as far as a 4 Blade Prop, I read somewhere where it said for my 120 Horse Motor, that was too much prop. <br /> <br />And the recomended prop is a 3 Blade.

 

[LubeDude]

Re: Props

Originally posted by SCBlue55:<br /> Okay thanks for that info, as far as a 4 Blade Prop, I read somewhere where it said for my 120 Horse Motor, that was too much prop. <br /> <br />And the recomended prop is a 3 Blade.

Too much prop? NOT!<br /><br />Recomended is the key word here, Dosnt mean you cant use a 4 blade.

 

[SCBlue55]

Re: Props

Okay then, if I was to use a 4 Blade prop, would the same diameter be used with the same Pitch?

 

[LubeDude]

Re: Props

Originally posted by LubeDude:<br />

Originally posted by SCBlue55:<br /> <br />I recently bought a 1967 16 Foot Boat with a 120 HP Mercruiser stern Drive.

Because we are talking about a stern drive, you are not over propped. You are actually about dialed in. If you want a better hole shot, I would go to a 15P four blade stainless. You might even gain a little in the top end department.

 

[SCBlue55]

Re: Props

Lube Dude nothing came thru on your Post. I tried to quote it, but I guess if there is nothing to Quote, then you can't Quote, you can Quote me on that

 

[LubeDude]

Re: Props

Thats because the answer to your question is in the quote.<br /><br />I asume you are now running an aluminum prop, a stainless would flex less and be heavier so you would need a 15P to run about the same as you are now, and the extra blade will cost you some RPMs, so I figure if you try a 15P Stainless 4 blade you should be about in the ball park.

 

[SCBlue55]

Re: Props

But at what Diameter? Keep the same 14.0 or should that be reduced to help compensate for the Stainless Prop?

 

[LubeDude]

Re: Props

I think I would stay the same, diameter really doesnt seem to make a huge difference, unless you make a drastic change.