Mph increase question
 

I've got a tired 200 horse 305 in an 87 Wellcraft 210, 2700 lbs, speedo reads 40-42, what can I expect going from the tired 305 to a 320hp 350? Thanks

Re: Mph increase question
 

47 maybe 50 on a good day

Re: Mph increase question
 

really, ok thanks

Re: Mph increase question
 

woody is about right, hp / speed not cheap or that easy... wish it was


hell no I dont then I wont make any money


at least im honest

Re: Mph increase question
 

what do you think it would take to get it into the mid 50's

Re: Mph increase question
 

Another 120HP more should give you a 8-9mph increase.
You said your 200/305 is tired so a fresh 320HP should give you more.
I know of two boats similar to yours running in the 50s with the new 325HP/350 vortec engines.
A 1984 20' Liberator and a 1989 205 Formula. The Formula has touched 60 a time or two but that boat is likely lighter than yours.

Re: Mph increase question
 

Are you sure that boat only weighs 2700 lbs? My 20 ft Malibu inboard ski boat weighs 2700. However it has a hull and drivetrain made for pulling and only a 260hp engine and it would go 47 when it was new. I'd guess right around 50 for the new engine.

Re: Mph increase question
 

Good Point...
My 1987 20' Donzi Minx weighed in at about 2700 dry. That boat would run well over 60mph with a 270HP/350.
My friend's Formula 205LS weighs in at about 3300 dry and has touched 60 with a new 325HP/350.

Woody, if your boat does really only weighs 2700, it will run close to 60 with a 320HP. But my guess is that it weighs at least 800lbs more than that...

Re: Mph increase question
 

I was just going by this


http://www.wellcraft.com/Images/CSer...Classic_87.jpg

Re: Mph increase question
 

Well then a 320HP/350 should do you just fine then... :drink:

Re: Mph increase question
 

I was hoping to hear that :drink:

Re: Mph increase question
 

Our 2000 - 210 w/ 230hp 350 mercrusier runs 46mph @ 4600rpms with ski prop and runs 50+mph w I think a 19 pitch, now thats on speedo not gps.
So with 320hp she should really run. Good luck!

Re: Mph increase question
 

man Im hoping so, it's to the point im almost dozing off while crusin down the river
:rolleyes:

Re: Mph increase question
 

My friend had a boat exactly like yours with a 350 Alpha (not the magnum) and his ran about 50 mph. This was before GPS but when the boat was new. He sold it in the early 90's.

Re: Mph increase question
 

This is what I like to hear, so with a decent 320-350 horse small block, it oughta be a fun boat
:D