PCM ZR6 409/450 question

[NautiUT]

I know the 409 is great on fuel consumption per hour. Just wondering how much more the 450 would consume per hour?

[TRDon]

I guess I never heard that the 6.0 was good on gas. On the contrary, I heard it was a gas hog. I cant imagine either are much different.

[2gofaster]

6.0 has better fuel economy, at least on the preCat engines.

[NautiDave07]

ZR6 consumption

My ZR6 economy seems to be very close to what my gt40 used and it was in a weighted 210. My 236 weighted is not as bad on gas as I thought it would be. It is probably no where near as good as the 3-3.5gal/hr like the guy above states. I think that figure is conservative for a wake boat. However, we always run more than stock weight and run the stock 236 crossover prop.

[TX-Foilhead]

I ran across a site that seemed to confirm this a month or so ago. They had boats they had tested like any pleasure boat magazine would, top speed, fuel consumption, range and what not. What caught my eye was they had a few years worth of data on Tige's including the last year when they switched to PCM engines. From looking at the same hull over the years with different motors the data showed that PCM motors used less fuel than the Marine Power motors, and that the larger motors were a bit better on gas. I don't remember if they were filing the factory ballast or not, we don't run ballast to foil.

I have seen 3.5 gal an hour a few times in my carbed Excel, but closer to 5 is more likely. My boat runs a bit different from the average wake boat, we don't really have anything dragging on it, we run 24 to 27, and absolutely no power turns. If a 230 is under 5 gal an hour I would consider that very good, I wouldn't think a 40 hp boost would change that very much.

Once a year I pull foils during a Drag Boat race, there are 6 power turns in each run that are unavoidable because we want the rider back in front of the crowd as quick as possible. That weekend we will burn through enough gas to usually last us 2 weeks.

[skiinxs]

6-Liter

My experience is that the 6-liter uses less fuel the way I use my boats. (Probably 65% 34mph slalom, 5% 36mph slalom, 10% slower speed slalom, 15% trick, 5% jump). I believe that it is a more modern engine with more efficient head design and will use less fuel at most normal skiing speeds. I am also certain that you could burn a lot more fuel at wide open throttle wth a 6 liter than with a 350, but that is not the way I use my boats. I currently have a 6-liter. Out of my last 10 Nautiques, seven have been six liters and 3 have been 5.7's.
Dave