My V-20 performance

[cterrebonne]

Originally Posted by Hammerhead

WOW,....fo' real??? that's a deal.

(Chris,... look into this.)

i'll back it up too, my 200 ficht was mounted too low and i was at 49.5 - 50 turing a 19" about 5600 or so i believe.

[chrisrub]

I'm sure it's a good deal, but by the time I get it shipped up here or run down there to virginia and pick it up I might lose the value there.. I'm not gonna rule it out just yet though

[Steplift 72']

The 1.6 litre is just under 100 cube's. 115 hp on a V-20 should get about 30 mph. A crossflow V-4 will drink the fuel if cruised at over 4000 rpm. I've had 2 OMC crossflow motors and found 3800 to be optimum cruise for mileage.

Have you checked compression, with a 15P prop it should turn well over 5000 if it's making the rated HP.

I've seen an early 70's V-20, lightly loaded, with an 85 Johnson make 28 at WOT.

My old V with a 135 hp crossflow Johnson ran mid 30's and got at least 2.5 mpg. The older V-20's were lightly equipped compared to the boats from the 80's and later.....how loaded down is your boat?

Your boat needs a 17P to get cruise speed in the proper rpm range, but doesn't have enough HP to turn it.

I tried a popular brand aftermarket prop on an 83' crossflow and it ran awful. We had to run an OMC prop, might have been an exhaust backpressure issue. What mfg prop are you using?

[chrisrub]

Originally Posted by Steplift 72'

The 1.6 litre is just under 100 cube's. 115 hp on a V-20 should get about 30 mph. A crossflow V-4 will drink the fuel if cruised at over 4000 rpm. I've had 2 OMC crossflow motors and found 3800 to be optimum cruise for mileage.

Have you checked compression, with a 15P prop it should turn well over 5000 if it's making the rated HP.

I've seen an early 70's V-20, lightly loaded, with an 85 Johnson make 28 at WOT.

My old V with a 135 hp crossflow Johnson ran mid 30's and got at least 2.5 mpg. The older V-20's were lightly equipped compared to the boats from the 80's and later.....how loaded down is your boat?

Your boat needs a 17P to get cruise speed in the proper rpm range, but doesn't have enough HP to turn it.

I tried a popular brand aftermarket prop on an 83' crossflow and it ran awful. We had to run an OMC prop, might have been an exhaust backpressure issue. What mfg prop are you using?

Haven't yet checked compression. I'm not even sure of the prop mfg, as its never been changed/serviced since my grandfather bought it back in 94!

I usually carry a light load. It's usually just myself, sometimes another guy or two will come. I run about 1/4 tank of fuel most of the time as I don't go far. Typical trip (3 miles each way, plus drifting and moving for about 3 hours) will burn about 10-12 gallons of gas.

[THEFERMANATOR]

I have the same boat with a 1.6L SEADRIVE and it had a fresh rebuild on it. I was using a 15 pitch stainless prop and was turning 5300-5400 WOT with me and 2 dogs in the boat and 3/4 tank of fuel. The 1.6L is pretty underpowered for a V-20, and milage will suffer because of it. I had to run 4200 just to keep the boat on a plane with mine, and it sucked down 35 gallons in 2 1/2 hours of running during break-in(just before the transom delaminated). The 2.0L has ALOT more power potential to be had, but a repower with a bracket would make the most sense financially if you keep it.

[Steplift 72']

Something is really wrong with the fuel consumption you've quoted. I've had 8000 pound boats that used less fuel. My 248 Offshore with twin 140's would run a 30 miles on 32 gallons with smooth seas.

1.6 litre parts are cheap, if you can get the HP up maybe you can re-prop to cruise below 4000. As long as you're cruising at 4500 you can forget about mileage with that crossflow motor.

[reelapeelin]

Originally Posted by Steplift 72'

Something is really wrong with the fuel consumption you've quoted. I've had 8000 pound boats that used less fuel. My 248 Offshore with twin 140's would run a 30 miles on 32 gallons with smooth seas.

1.6 litre parts are cheap, if you can get the HP up maybe you can re-prop to cruise below 4000. As long as you're cruising at 4500 you can forget about mileage with that crossflow motor.

You HAD a 248 OFFSHORE!?...lordy, what happened to it

[Steplift 72']

I bought a 248 Offshore new in 1985 and powered it with twin 1986 Evinrude looper 140's. I ran it until 1994 and have since owned a few more including a Grady White 248 Offshore with twin 130 loopers. The Wellcraft 248 was the best boat I've owned, I had it 140 miles offshore once and typicall ran 80 to 100 mile out. It was so easy on fuel compared to the Grady White, it planed out nicely at 3500 and cruised economically up to 4300 which was getting close to 35 mph. I never installed trim tabs on the boat because it planed so flat at such a low speed. It had the best walkaround design I've seen since the front deck walkway turned outboard and drained over the side.It would really scream loaded lightly and it's embarrased a few bass boats and ski boats. I sold it to a car salesman that forgot to install the plug....he thinks. They're lucky to have survived. It went down in WC Block 110 about 18 miles south of Cameron, LA in the winter of 1995. They were picked up by a commercial boat minutes later. I saw a 248 project hull for sale at a marine salvage place somewhere around Atlanta. They also have a 21 Nova for $750! I always loved the look of the Nova. I belive the place might be called Lanier Marine Liquidators.