Re: Tach pegs out at WOT
Wow You are right! I checked out the tach using an induction timing light on my son' Celica, (4 stroke= 1pulse/2rev, or 2 rev per OB rev) at 800/1500/2000 RPM on the OB, double on the car, could actually go 100 RPM in both direction on the car and see the the OB flywheel change directions with the strobe. Pretty cool. This was after I played with the settings on the tach. Turns out the plastic arrow wasn't engaging the switch inside the tach, so no effect until I removed it and moved the switch directly. Now for the test with the 13 1/4 X 17, 5300 RPM at 40mph, 4600 RPM at 34mph. I move the trim rod out one hole away from hull and increased Speed about two or three mph. With the 13 X 19 it ran about 4900 RPM and 37mph as RPMs dropped speed droppped drasticly. I also ran an old 14 X 15 it's now about 13 1/2 x 15 after dressing it up, 5800 RPM at 35 slow but could probably pull the dock with it. I am convinced now that the 17P is right for this boat/motor are there any other issues to consider ie, 13, 13 1/4, 13 1/2, 14 inch, 4 blade vs three, stainless vs aluminum. I know stainless is better but three times the cost, not sure could justify for 85 HP on an old tub. Every thing I've tried has been 3 blade. Thanks Guy an everyone else for all you help.