speed numbers on a v-20
 

therorethically speaking, what kind of speed numbers would a v-20 see with a 225? anyone did this?

50+ is my guess, but just a guess.

It really doesn't matter what the numbers are! It will go faster then the boat was ever made to go, and you will only be able to do it on FLAT water or you beat the hull to s**t!!

I honestly believe 50+. I don't have a gps yet, and my speedo kicks up at that speed (isn't very accurate anyway). Runs the best in a light chop. I run a 14 1/2" X 19" stainless prop.

p.s. I always drop the bimini and stow anything I'd like to keep when blowing her out. ;)

If it means anything, I smoked an '82 grady white 201 with a 225 yamaha

sweet man....the whole point of over powering is to still do that same cruise speed but at lower rpm to increase efficientcy.

I only run at full speed for short distances usually before putting her on the trailer. Usually I cruise at 3800-4400 rpms. She'll hold a plane at 3200 but "feels" better with a little more gas.

If I ever find a "Skools Out" deal on a 15 X17 prop I might switch to get a little more bottom end and not so much speed.

you have tabs on your boat?

I bet you would hit 55 plus with it trimmed out. Would be a white knuckle ride though. With my V at wot and trimmed up to max speed without over-revving (with a 190 h.p. 4.3 litre v6 I/O) I do at least 45 and the handling feels pretty dicey. Not sure I would want to experience 55 plus in the V

it probably wont be so bad with tabs

No trim tabs, I've got a hydrofoil on the cavitaiton plate.

those help with planning the boat really good, with tabs with the 225 it should keep the rear end stable but thats a long ways away i still need to finish the hydrostream

My CC has gotten up to 45mph on GPS coming down my creek one evening when it was glass. I had the center panel on my T-top on and my side curtains rolled up. I'm running an old as dirt 1992 2.3l 200hp Mercury ob. No tabs, and it was before I got my foil on the engine. I think now i might hit 47-48, I haven't actually tested it with the ideal conditions yet. You should get at least 50 mph. In reality, 25 more horses won't give you a big gain in the top end like it does in a car. You'll shoot out of the hole a bit quicker though.

You'd have to turn at least 5800+ rpm with a 19 pitch prop to see 50mph.
http://www.go-fast.com/Prop_Slip_Calculator.htm

That's not an easy thing to do, cause most 225's are big heavy 3.0L + motors. If you find a Yamaha 2.6L 225 or a excel or 220 special . . . Those will hit 50+ with the v20. I actually think the boat would be slower with a stock 3.0L Merc 225 vs. a 2.5L merc 200. 200hpdi . . . would probably hit 50mph. The extra 5mph takes exponentially more HP to reach once you get above 45 mph.

[QUOTE=bigshrimpin;115427]You'd have to turn at least 5800+ rpm with a 19 pitch prop to see 50mph.
http://www.go-fast.com/Prop_Slip_Calculator.htm

That's not an easy thing to do, cause most 225's are big heavy 3.0L + motors. If you find a Yamaha 2.6L 225 or a excel or 220 special . QUOTE]


you must be joking? yamaha's are dogs compared to mercs and omc's brp's.

I'd have to dissagree as well, the 3.0 L Mercurys will run if you prop them right, they will spin a big blade surface prop that will bog most high reving smaller motors. My 81 V has a 85 2.4L 200 carb motor, it came with a 21 P, don't know any numbers on it yet as I haven't put it in the water yet.

Here's wellcraft's numbers for a 1996 v21 with a 2.5L Mercury 200. You'd be lucky to get more out of the 3.0L . . . and with the open transom on the v20 . . . I personally wouldn't want the extra weight of a large displacement 225.

Spares the 2.4L 200 with fingerports is my favorite old two stroke motor. I think you'll see high 40's with that power.

http://www.wellcraft.com/owners/info...IG_V_21_96.jpg

1993 2.5L merc 150 vs. 1993 2.6L yamaha vertical reed 150

http://www.wellcraft.com/owners/info..._Fish_1993.jpg
http://www.wellcraft.com/owners/info...pLift_1993.jpg

cterrebonne - Find a Merc 245 or 260 and you'll be in bid'ness.
Even though I perfer mercs . . . those 220 specials with the horizontal front, big carbs, and compression up around 130/140psi those motors are pretty strong :)

I just think it's gonna be difficult to get to 55 even with the little pad on the bottom of the v20.

thanks for posting those spec sheets on the v20 big shrimpin. i noticed the specs and that yamaha compared to the merc is a dog. the merc 200 hit 50.4 which isnt bad at all but i own a 200 2.5l merc and compared to the 3.1 omc brp block its a sissy (which i also own). its crazy because when putting then both on the dyno its not even close between the two engines. but i do agree with you shrimpin 55 will be hard even with the 225 ficht.

When we repowered and the engine had less than 10 hours on it, we eeked out a 50 mph reading, wide open with the engine trimmed waay up. I've not been able to reproduce that since then, even just a few weeks ago with new bottom paint. Mid-40s seems to be the best I can do, but as was said earlier it feels pretty dicey. A cross-wind gust feels like it's going to put her on her side! But I rarely run her anywhere close to wide open, unless it's a calm day and I just want to let her stretch.

200 hpdi is that a 2.6litre version? thats odd to loose 5mph like you did you might want to check on the prop either that or fuel and equip weight is slowing it down. from what im reading i should at least be able to squeeze 50.