My V-20 performance

[chrisrub]

Originally Posted by jjjjasonab

I have the 2.0 model sea drive and i hit 55 mph w/ 225hp via GPS in 1-2 foot seas. Its gotta be the prop. go to the prop shop and get a new higher p prop or buy my seadrive and motor and slap it on there and hold on, ill take 1500.00 for the whole drive and motor and its already off the boat, i had a bad transom. Jason 1-757-724-8686

I will definitely keep that in mind if I decide to go that route. Right now I am looking at some other boats, but still haven't decided totally against a repower. Thanks for the offer!

[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.