speed numbers on a v-20

[bradford]

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.

[cterrebonne]

Originally Posted by bradford

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?

[nipper]

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

[cterrebonne]

Originally Posted by nipper

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

[bradford]

Originally Posted by cterrebonne

you have tabs on your boat?

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

[cterrebonne]

Originally Posted by bradford

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

[bcmarinamanager]

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.

[bigshrimpin]

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.

[cterrebonne]

[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.

[spareparts]

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.