Repower 21

[Bushwacker]

Originally Posted by elpez

I repowered my 21 with the 200 etec in 2005, had some corrosion issues and BRP sent me a new lower unit, quiet, fast very nice, does not spin over 5,300 but that is the prop, gets up real fast. Would do it again.

You obviously have a 3.3L 90 degree big block version of the 200, since the small block 60 degree motor didn't come out til 2006, as a 2007 model. Sounds like it's a good match for the boat! Not sure about your 2005 model, but the OPTIMUM WOT rpm for the 2008 models was 5500-5600, so you're definitely overpropped if it only turns 5300. What prop are you currently running? Assuming your motor height is right and AV plate is dry when you're fully trimmed out on plane, I suspect you'd like the motor even more with a prop that has a little less pitch! You might check out the E-Tec Owners web site, http://www.etecownersgroup.com/post/...-Chart-2671224, and post current prop dimensions and performance info to see what they recommend for the best prop. The Rebel seems to be the favorite of the guys running heavy deep-V's for best fuel economy, good stern lift and ability hang on plane at low speed. Sort of like a 4-blade but without the drag of the extra blade.

Pair of Jacks, I notice the 200 HP small block OPTIMUM rpm is 5600- 5850, which confirms my suspicion that it's optimized for max HP rather than mid-range torque. If you're only turning a 14.5 X 15P to 5400 rpm with a light load, going up in diameter is probably the wrong direction unless that's a really lousy aluminum prop. Your 175 should be turning about 5600 with a light load. I would think the 15.75 x 15p Rebel would be even harder to turn. I can turn a 4B 15x15 PowerTech ELE series prop about 5400-5500 on my 20. but not sure that larger diameter Rebel would be any easier to turn, even with one less blade. Here's a link to the BRP props http://www.etecownersgroup.com/post/...-Chart-2671224. You might also contact PowerTech http://www.ptpropeller.com/content-c..._90_300hp.html to see what they recommend. They make some very nice USA-made props at very competitive prices. My prop is compatible with the Michigan 2-piece hub system which appears to be significantly more robust than the Merc Flo-Torq hubs I've looked at.