Help Please!!!! 88 Four Winns Liberator 211 is SLOW!!
 

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

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?

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

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

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

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

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!!

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.

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

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.