Prop difference?

[THEFERMANATOR]

Originally Posted by cfelton

How about the diameter, does 15 inch sound right? I'll probably go with a 19 pitch for speed and economy. I don't pull skiers or a tube very much so I guess Im trying to get more milage and top end speed. My engine kinda sounds like its straining running WOT. If my buddy will swap props for a day maybe Ill try that and see how that does. I know his prop is a 19 pitch, not sure of the diameter.

Only downside to the 15" diameter is you will most likely have to trim your trim anode or go with a smooth one to clear it. And be prepared to step down in pitch as the larger diamter bites better with less slip.

[twhrider2]

C... I have a Mirage 15.5x17 that gave me 38mph at 4600 WOT, a little too much RPM for the 2-barrel, I now have a 15.25x19 Mirage that I hope to try soon. And yes you will have to trim a regular trim tab. I did try a 19p aluminum that gave me 4300 WOT and engine sounded happy there no lugging or overturning but it had been ground too thin and cracked. BTW timing is 5/6 degrees, pertronix and 89 non-ethanol.
If you would like to try the 17p Mirage you are more than welcome to, also have a 21p ss not sure of make it gave upper 3's in rpms.

[bigshrimpin]

I love the mirage prop for the v20, if you get a chance try an enertia. I gained 3.5mph switching from a mirage plus 15p to enertia 17p turning close to the same rpm's.

[cfelton]

If I can find one I might give that a try! Asked my buddy and I don't think he was too keen on swapping props for a day. He did say it was a 19 pitch and he got it from The Prop Shop up in Virginia, next to Portsmouth Trailer Service. Said he paid 250.00 for it.

[bigshrimpin]

This is a old vertical reed 1987 Merc 175hp powerhead pushing my 23 seacraft with a 17p enertia in a little chop.

https://www.youtube.com/watch?v=jg7c...ature=youtu.be

With the 15P mirage plus WOT bounced b/w 39-40 with a full tank.

with the 17p enertia I had no problem hitting 42-43

[cfelton]

Looked up the Enertia prop on ebay, found a few but they ain't cheap are they. I'll try to find a used one. Do you remember the diameter? That 175 had that boat in the wind! looks like it performed very well!

[garbubba]

I'd recommend not buying a brand new prop until you are sure what you need.

I'm betting the Prop Shop will let you try one out. Most shops will, there really is no other way to know what prop is the right one. Twhrider sounds like a guy that could help. I live too far away but I have a 15x19 cupped Michigan that I'd recommend, Quicksilver makes a good prop too, imo.

I'd hate for you to lay out $400 & find out that doesn't fix it, try to find a way to test one out first, best to be sure.

All the advice you've gotten here is good but I'm a simple guy

---Find out the WOT speed for your engine.
---Find a prop that will get you close to that speed with a normally loaded boat.
---Keep your old prop for a spare & go boating.