Kylep0112

Hi, I have a 88 Four Winns Liberator 211 with a 350 omc cobra drive. (Says king cobra on the hydraulic arms but doesnt have the distinct hump) A few years back when I originally purchased the boat it would run around 4600rpm-4700rpm at 57mph using a 14x3/4 x 21 SST stainless prop. Now on a freshly built motor running tbe same prop im only getting 4400rpm at 48mph. This is quite frusterating, and it comes out of the hole the same which I think it has a good hole shot. I talked to my engine builder and he said I should be able to run around 4700rpm-4800rpm. Below is some more info on my set-up if at all interested. The outdrive was rebuilt 2 years ago with the heavy duty gears, stock ratio still.


On a tired motor last summer I got a good deal on a weiand 142 blower and decided to put it on, knowing my motor was tired, I knew it wouldnt last long. After a couple hard test runs with the blower I blew a head gasket. I pulled the motor and had it mildly built by a well known local engine builder. Its bored 30over, has a mild cam that matches my edelbrock aluminum heads and intake, msd distributor and coil along with a new edelbrock 600 carb topped with a marine k&n air filter. Timing is set at 12º advanced and 37º total timing.

Thank you for your time and I'm looking forward to your suggestions

Crude Intentions

iTrader: (1)

Speed gps or dreamometer? Tach accurate? Something is off with numbers. What's the prop pitch? 14 3/4 would be diameter. 19 or 21 is likely pitch. What is drive ratio? Was motor dynoed?

Kylep0112

Speed was on a handheld Garmin GPS, I am unsure if the tach is accurate, prop pitch is 21. I am unsure of drive ratio, I am thinking the stock ratio is 1.43:1 if I recall. Motor was not dynoed

Rookie

iTrader: (4)

I would be asking my builder where is my power. Do you still have the blower on?

Kylep0112

I sold the blower after I blew the head gaskets.... My family has known the guy who built my motor for 20+ yrs, he assures me that it is built properly for marine application. He has came out and checked it over, double checked timing, it has 1 gallon of race fuel to 10 gallons of super premium ethanol free fuel

Old Navy

Where can you get "super premium ethanol free fuel" in west michigan?

Kylep0112

There is a Citgo about 5 miles from my work, they are the only place that offers Super Premium Ethanol Free fuel.

http://citgo.mycstore.com/13697012

it is a little mom/pop little full service station, LOVE IT!!

Mr Maine

http://www.fourwinns.com/upload/Docu...Facts_1988.pdf
Page 52 shows 46-48mph for this boat with a 270 horse 350. Just a reference.

Kylep0112

That is an awesome manual, thank you for posting that. I know for a fact that this boat would go 57mph consistantly on my garmin gps

Rookie

iTrader: (4)

Can you post the specs of the build cam/compression/heads?
There are some very knowledgeable folks on this board and can give a basic HP correlation. Then they can determine if you have
more or less power for comparison.