20SF with a 150 ETEC numbers

I just re-powered my 20SF with a 150 ETEC. Several of you PM’ed me asking about the performance numbers. I had it out yesterday and took some notes. I used the numbers from my BRP tach, my Flo-scan fuel flow meter, and my GPS.

RPM/gph/mph

1500/1.5/7
3500/ 7/27
3800 / 8/ 34
4100 /9/ 36
5000 /15/ 44
5400(WOT) /16.5/ 47

These numbers at WOT are better than the Yami 175 carb I had on it at cruise. I am tickled pink. It was just me with a normal fishing load and a full fuel tank. The ETEC pushed double oil for the first five hours of operation, so the double oil is there. Numbers may change after that break-in period. The ETEC has a 19 inch Viper prop that the dealer propped out for me when he installed the engine. I also have the engine mounted on a Porta-bracket. There are significant variances in numbers based on the position of the bracket (up or down). These numbers were taken at what I consider a normal running setting for the bracket – sort of mid-range. I have very mixed feelings about the bracket. It was on the boat when I bough it and I had visions of removing it a redoing the transom – still do. However – I can’t be without the boat for that long – I suffer from a lack of fishing syndrome that doctors say is only cured by being in a boat and fishing.

[76Red18]

Great numbers! Best economy I've seen with my carbed Johnson is about 2 mpg!! You could do much better than that Viper prop. No stern lift. Maybe discuss that with your dealer while that vipers unscared. BPR Renegade 4 blade lifts the whole boat. Mercury Revolution 4 picks up the stern; might be a good choice with that bracket.

Actually, the Viper jumps out of the water! I was surprised - like a bass boat!

[todosier]

Thanks for taking the time to put those numers up. It is really helpful for those of us thinking about power options.

Tod

[Fr. Frank]

The Viper is actually the old OMC RAKER propeller revisited, with greater rake progression, more efficient cupping geometry, and more aggressive initial angle of attack on each leading edge. It's a pretty good propeller, but not really a sternlifter. It's more of a bow-lifter, with slightly increased rake progression to provide more whole-hull lift.

[76Red18]

Not what you want when the going gets ROUGH. From my experience, the bow would not stay down even with tabs.