wellcraft v20 with 90 2-stroke

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fordy

New member
Just wanted to throw up some numbers from a seatrail today on my new (to me) v20 that has a yamaha 90hp two stroke

On plane at 15-16mph
WOT w/ 2 people 28.7
WOT w/ 3 people 28.0


Theres a chance you might recognize this boat from CL
 

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thats doing pretty good.. (if numbers are correct!) Mine does about 35 WOT with 2ppl.. But my stern is heavy due to the NidaBond transom and 32 gal bait tank that sits in the old engine well. I also have a 85gal fuel tank, tower, swim step/bracket merc 175.

when We run in moderate seas, with the tabs down for comfort and cruise at 26mph with 3 ppl on.. at about 4150 rpm while between 9 - 10 gallon per hr..
 
jasoncooperpcola said:
I'll keep my 26 year old, 1 mpg, 29 mph top speed, devil possessed, electrical gremlinized Johnson before hanging a suzuki on my V20.(murphy loves it too :love:) :you:
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No kiddin'...you oughtta be gettin closer to 40 outta yer Johnnie...you might wanna look at some different props...could help the gas mileage too...but I also understand keepin things as they are...devil possessed and all!!...:you:
 
That's cruising along ok for only 90 hp....... maybe drop down to a 70hp and see if that's better..........or maybe even a 55hp.
 
speed

All those number seem low, my '78 V20 cuddy with a '87 150 Suzuki will run
44 mph and cruises at 28 mph at 3500rpm.. Does that sound right?
 
Wolf said:
All those number seem low, my '78 V20 cuddy with a '87 150 Suzuki will run
44 mph and cruises at 28 mph at 3500rpm.. Does that sound right?
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If those are your numbers they're great...you must be propped high...I've had two different 150s (1 2 stroke and 1 4 stroke) and I haven't seen 44 or 28 mph @ 3500...
 
fordy said:
Just wanted to throw up some numbers from a seatrail today on my new (to me) v20 that has a yamaha 90hp two stroke

On plane at 15-16mph
WOT w/ 2 people 28.7
WOT w/ 3 people 28.0


Theres a chance you might recognize this boat from CL
Click to expand...

I certainly believe those numbers, right in line with the 28 mph from my old V-20 with an 85 Johnson. The Yamaha 3 cylinder is probably a bit lighter too.
 
reelapeelin said:
If those are your numbers they're great...you must be propped high...I've had two different 150s (1 2 stroke and 1 4 stroke) and I haven't seen 44 or 28 mph @ 3500...
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Wish someone with a connection to Mercury could get their hands on the old "Boathouse Bulletins" from Lake X where they tested boat & motor combinations. The 1983 Mercury info for the Wellcraft V20 said 46 mph with their 150 V6 and a 19P prop, 20 gallons fuel, no gear and 2 persons onboard. I tried a 19P prop and went to 17P because real world is 72 gallons of fuel, ice chests and tackle. Mine did about 42 mph real world with a good load and 150 hp.
 
Steplift 72' said:
Wish someone with a connection to Mercury could get their hands on the old "Boathouse Bulletins" from Lake X where they tested boat & motor combinations. The 1983 Mercury info for the Wellcraft V20 said 46 mph with their 150 V6 and a 19P prop, 20 gallons fuel, no gear and 2 persons onboard. I tried a 19P prop and went to 17P because real world is 72 gallons of fuel, ice chests and tackle. Mine did about 42 mph real world with a good load and 150 hp.
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That's good speed - I'm getting just about 40.0 mph with 150 Johnson and 1/2 tank - 30 gallons on my V21. That was on the ocean, not flat so might get a bit more. With 150hp generally 38-42 mph seems the WOT speed.
 
With my V21, flat calm on the bay and very little tide movement I get about 37mph at WOT with the 150 Honda on the back. Cruise is around 26ish at 3700 according to GPS.
 
I have a Johnson 150 ocean runner with a 17p prop with 5 people & gear and flat lake I top out right around 40 - 42 mph. Not sure what it would be just 2 people and light gear.
 
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