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#1
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Re: prop survey
Stock Aluminum prop on '75 135 HP Evinrude, 13x19, hitting 4800RPM max and 38MPH (GPS), two people, 3/4 tank ( 45 gallon capacity). Yesterday ordered new 13 1/4 x 17 to try to get a little more RPM's.
But, from reading boards, looks like link and sync might be all that was needed, or might need to do in addition to prop. Is that a simply task to perform?
__________________
'72 CC Picture Gallery 
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#2
05-07-2006, 02:13 PM
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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... :-/...
__________________
'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha 
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#3
05-07-2006, 04:31 PM
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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
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#4
05-08-2006, 08:58 PM
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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
__________________
love to fish
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#5
05-09-2006, 08:52 AM
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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... ;)...
__________________
'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha
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#6
05-09-2006, 06:43 PM
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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
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#7
05-10-2006, 11:41 AM
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Re: prop survey
That prop...you on the right track now ;) ...
__________________
'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha
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#8
05-12-2006, 05:56 PM
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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?
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#9
05-13-2006, 12:43 AM
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Re: prop survey
you guys keep mentioning bottom paint. does it make much difference if you have it or not? better speed?
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#10
05-13-2006, 02:11 PM
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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.
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