ok - this piqued my curiosity and I ran some numbers...
Merc says at 4200 it puts out 370HP and at 3000 it puts out 330HP/572ft-lbs and uses 7.8gph.
If my prop slip numbers are ok and the performance numbers posted here for various Sceptres are somewhat close then WOT would be low 50's, cruise in the low 40s (mph) and fuel economy should be near 6mpg at cruise. One challenge might be that, having so much power even at the low end, idle & trolling speeds might be faster than most want. A 40mph (or even 35mph) cruise would be pretty tough for me on a lot of days - I dont bounce back from that kind of beating as well as I used to.
I have a Bravo 1X Diesel drive going in my Sceptre so all I would need is the motor - I would love to be a guinea pig if someone else would fund it! All that said, the parts would scare me. That motor is built by VW for only Marine apps, Touareg, Audi A8&Q7 and the Porsche Cayenne. I'm thinking an ECM or a turbo would pretty be hard to get (and harder to get properly installed) in most places even with a healthy checkbook.
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10-05-2015, 08:59 AM
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