20' Seafari ETEC 150 Engine Height
Michael-
After the dealer raised the engine twice I raised it to hole #4 (the bottom hole) using Bushwacker’s method. The engine is at max height without re-drilling the transom. My transom has two sets of mount holes: the original from the 1976 Merc 150, then the last must be from the 1985 Merc 150. The current top hole is about two inches above the original set. A more precise way to tell you where the engine is, as close as I can measure it, is 2" higher than if it were sitting flat on the aluminum extrusion on top of the transom. Measuring the height of the A/V plate above the keel may not be too accurate the way my boat sits on the trailer: my results about 1.5". I don't have a current photo of the A/V plate underway, but it looks similar to what Bushwacker recently posted. I could possibly go another hole higher, but am satisfied with the current results. I am running the ETEC 150 HO which at WOT should run 5500-5600 and up to 5800 rpm lightly loaded. For watersports I am running a SST High Five 5B 13.5" x 17P prop at 41.2mph at 5710rpm WOT (lightly loaded, two people, half tank, bimini down). Last week with three people in the boat, lots of food & beverages, and barefoot boom I pulled a 185# barefooter at almost 40 mph. .Same engine height and similar test conditions on the SST Cyclone 4B 14.5" x 15P was 40.8mph at 5280rpm (so the speed was not bad, but the engine was not reving fast enough The performance of the Cyclone was good and it picked up speed much more quickly than the High Five, but it gave me more speed variation at 18mph for wakeboarding and did not rev high enough. Bushwacker liked my Cyclone on his ETEC 150 on his Seafari. The Powertech 4B 15” x 15P (same conditions again) gave me 38.0mph at 5340 rplm WOT.
.
|