Prop for V20 cuddy with 225 OMC ob?

  • Thread starter Thread starter High_Wire
  • Start date Start date
H

High_Wire

Guest
Replacing a 150 with a 1998 225 johnson 2 stroke carb motor. How much pitch do I need with a 3 blade alum? How fast will it go?
1987 V20 cuddy
 
Skools, most of us with 150's will twist a 17p to max rpm's. I'd say 19p if not 21' for the 225 boys.

Airslot
 
My 225's all have 17's on them except 1 it has a Merc 19 Offshore stainless prop. The 225 off Boater93's boat has a 15 x 17 Mich. Stainless Prop.

HEY BOATER93 WHERE ARE YOU lol.

What was your WOT RPM's with the old 225?
 
My current prop was off my 225 Merc, however that was on a 24' boat (1997 Sea Ray Laguna).  It works perfectly on my 150.  My 150 came with a 17'' on the V20 when I bought it.  Both props are the same diameter.  
 
THis is intresting. Looks to me like once you get to 150 hp that the advantage of more power falls of very quickly on these hulls. If the gear ratio's are the same and you can't turn more prop, why bother?

Airslot
 
Well MJ, I guess it could sleep with ya. The hub should already be lubed, but watch for the sharp edges. :D

Airslot
 
i checked my old 225 off my boat it was a 14.5 x 19 cupped stainless Merc prop. and Boaters had a 15 x 17 Mich. stainless cupped. I would like to try a 21 myself. I'm going to find one on ebay and test a 21 when the boat is afloat.
 
macojoe said:
for $340 bucks it better sleep with me to!!  :o

Welcome to the board!!
Click to expand...


;D Well how about it lift's your stern so high there is no longer a running wake just a frothy atomizied disturbance behind your transom........maybe a little chine walk and at 40 its as smooth as silk on a 3 foot chop.

Ummm better than your current sex life .... you be the judge....... ;)
 
I have a '77 cuddy w/ a '95 225 Merc. EFI, & I have a couple of props. I have a 17" x15 1/2" stock Merc Alum. Prop, which I can turn at 5700 to 5800, & get about 46 to 47 mph, I have two Mirage SS Props Which I got on E-Bay which are 19" x 15 1/4", One I run as is, & it turns About 5300 to 5350, at 50 to 51 mph. The other I had redone, they took 2" of pitch out of it, & added a lot of cup, that one runs about 5500 to 5600, at 47.5 to 48.5 mph. Of course a lot depends on the day, wind and current, & especially load. All speeds GPS. The 19" unworked prop gets best cruse milage, good for off shore fishing, no hole shot needed. The reworked Mirage best all around performance. SS definately better than Alum. look around on E-Bay for a deal. I hope these numbers help you some. Good Luck, Joe
 
Airslot said:
THis is intresting.  Looks to me like once you get to 150 hp that the advantage of more power falls of very quickly on these hulls.  If the gear ratio's are the same and you can't turn more prop, why bother?

Airslot
Click to expand...

The bigger motors have lower gear ratios and spin the shorter pitch prop faster. You still get more speed for a given engine rpm even though the pitch of the props are the same.

If the gear ratio of the 225 and 150's are the same and the 150 guys are running a 17, then I would run a 19. If you have a lower gear ratio than the 150's, I would stick with a 17.
 
Thanks for the input. I traded the 15x17 for a 19" pitch even up to start. I will post the results when I get it in the water.
 
is ss realy that much better than aluminium? why? i know it will flex less but, that is why i want to remove my ss and put on aluminium. so when, not if, i hit something i tear up the prop, not the unit. i have seen a few outboards on ebay that needed new cranks due to this very thing. do y'all think if they were spinning aluminium props it would have saved the crank?
 
You must log in or register to reply here.
Back
Top