Re: prop survey
 

Tin, what mfgr of the tach (Teleflex or who?)...there should be a slotted plastic screw-head flush w/ the back of the tach's case w/ small markings at the different settings...you might have to shine a light in there to see it...

Sfprovyn, what is tach showin' at 37 mph?...for a 150, I'm thinkin' you got some more performance that small dia. and 18 pitch prop ain't geetin' for ya...IMHO, these heavy V20s need a larger dia. prop as I tried several and got best from a 15 1/4" dia. ;) ...and keep in mind that the wrong prop will overwork the motor and shorten life, not to mention a negative fuel efficiency... :-/...

Re: prop survey
 

I dont have a tach so I dont know about the RPM's. A friend of mine told me that I would be better off if I went to 14.5 x17 in a 4 blade and I think I may borrow his to try out. Frank

Re: prop survey
 

hey i want to thank you guys for the info on the prop
i went from a 13 1/4 x 19 to a 15 x17 and just like you said no more cavitation and more speed it throse you back when you throttle up
A BIG THANKS FOR YOUR HELP
you saved me alot of cash
thanks again
now all i gotta do is fix the knocking in reverse
go to repair section

Re: prop survey
 

step...glad to hear it worked out for ya!! ;) ...you ZOOMIN' NOW!!! ;D ;D

SFprovyn...gonna be hard to tell if right prop w/ out tach... ;)...

Re: prop survey
 

You are right. I just put in an old Merc tach and hooked it up and saturday my friend is going to loan me a 15.5 x 17 3 blade aluminum prop that he has on his v-20 center console also with a merc 150..He gets around 42 and has bottom paint also. He thinks I should get 4 MPH more with the bigger prop. I'll let you know. Thanks Frank

Re: prop survey
 

That prop...you on the right track now ;) ...

the right prop?
 

i have a 5.0 mercruiser I/O and my top speed is 35 at 4200 rpms I have noticed a lot of cavitation. Anyone have a good idea about what kind of prop i should have The prop on it now is a 19 pitch. not sure what diameter but there is a little more that in inch clearance with the trim tab. Maybe a four blade thats bigger?

Re: prop survey
 

you guys keep mentioning bottom paint. does it make much difference if you have it or not? better speed?

bottom paint
 

Bottom paint creates more drag and you lose speed. You dont lose much though, about 1/2 a knot maybe 1 knot. You only need bottom paint if your going to leave it in the water. If its already on there dont take it off. Its way to much work.

Re: prop survey
 

yosh09 welcome aboard! Bill Mc ;D