New member/Prop Advice?

[tsubaki]

Welcome to the site!
Before changing the prop, look at the engine setup.
Depending on what performance you want to achieve, raising or lowering the engine on the transom a bolt hole or two can make a lot of difference.
Usually the starting point is to have the cavitation plate even with the bottom of the boat and go up from there. Having the cavitation plate a little over an inch above the bottom of the boat is not uncommon. This will vary greatly with hull design and engine setback. Having one too high will cause overheating and ventilation.
My boat is different than yours, the OAL is 20'6" and I've got a jack plate on it but maybe this thread will give you some ideas.
http://www.wellcraftv20.com/communit...ad.php?t=12543

[spareparts]

make sure your tachometer is accurate, compare it with another tach(tempoary hook up another one) or have a tech use their shop tach to check yours.

[THEFERMANATOR]

Originally Posted by spareparts

make sure your tachometer is accurate, compare it with another tach(tempoary hook up another one) or have a tech use their shop tach to check yours.

I would think he's pretty close(within 200RPM). I know many like the 17 pitch prop for a V-20, but with a 1.86:1 lower it is an awful lot of pitch for a 150 to spin. If it was a 2.0L MERC with a 2:1, it would be dead on, or if it was a 200+ it would be fine. For a 150 though I think he needs to drop back to a 15 pitch prop. His current numbers put him at roughly 5% prop slip, so it sounds like the engine may be a tad to deep on the transom. And the easiest way to check if the engine is mounted correctly is go out and run it. While at WOT go back and look at the anti cavitation plate(it's best to have somebody else drive instead of leaving her unattended) and see if it is under the water, even or out of the water. For best performance you want it to be just out of the water at WOT.

[macojoe]

I use to run a 15 pitch I liked the performance much better, tad slower top end but better every where else.

[jhamz71]

I run a 14 3/4x17 on my 85 v20. 5000 rpms and i can do about 42-43 with a good bit of fuel and two passengers. 2000 Johnson 175 though. not sure whether it is actually a 175 or 150 though because the id plate is unreadable.

[AJC]

Definitely go with 15 pitch galvanized

[Destroyer]

Originally Posted by AJC

Definitely go with 15 pitch galvanized

I'm not aware of any prop maker that makes a Galvanized prop. I think you mean Aluminum. Basically your choices in props are Aluminum, Stainless Steel, Bronze or some form of plastic.