ski behind a z275st?
Hi all - I'm looking into buying a z275st at sea level and bringing it to Colorado at 6,000 ft elevation. First, I'm wondering if anyone has trouble pulling a skier with this boat with a 6.2 merc bravo III duo prop. Second, should I plan on a certain pitch of the prop or adjustments to the engine to bring it up here? Not sure what pitch the prop is yet. Thanks for any input!
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Re: ski behind a z275st?
The only problem you'll have , is not being able to pass by a fueling dock.:yes_grin:
There are a few guys that have a setup like the 275 that I am sure will chime in to help you out with adjustments and Duo Prop choices. Welcome to MOC! :) |
Re: ski behind a z275st?
There is no question that altitude saps power. If you have a carbed boat the carb will likely need to be re-jetted to a smaller size & i believe i read that for every 2000 ft increase in altitude from sea level, you can reduce the jets by one size. You may also have to lean the mixture out a bit also to help it idle better as well as advancing the timing about 1/2 degree for every 1000 ft altitude increase. And re-propping is likely a necessity.
Just as one more tidbit of info, i also read that for every 1000 ft in elevation, your engine loses 3% of its power in stock form so at say 6000 ft, you are losing approx 18% of your power without making any adjustments which means a 300 hp engine just dropped to 246 hp. |
Re: ski behind a z275st?
Ouch!
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Re: ski behind a z275st?
I own the Z302 and i ski wakeboard and have pulled up to 3 people behind mine with no problem, and i have the little 7.4l volvo.
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Re: ski behind a z275st?
Thsnks! Can you tell me what prop you use and your elevation?
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Re: ski behind a z275st?
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Re: ski behind a z275st?
Ok gotcha sorry bout that I own diesels and I know altitude changes alot didnt knoe it was that big of a problem on gas. But now that I think about it. Its essentialy the same thing different engines
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Re: ski behind a z275st?
I think Mikey hit the nail on the head. To be more specific about his original question....what specific changes would need to be made to bring a boat from sea level to 6,000 ft elevation. And if those changes are not made, would he be able to pull someone "out of the hole" with the 6.2L engine?
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Re: ski behind a z275st?
I have a similar set up. You are heavier than my Shabah 250 with a 7.4 Bravo 1. I got my boat from 2,200 ft elevation an brought it back to Colorado at 5000 ft. I did not change from the Mirage 19p prop an it runs decent. I don't hit recommended WOT at 4600 but about 4400.
I went down to 3700 ft at Powell a few weeks ago. Ran noticeably better. Out of hole faster an top speed was up about 3-5 mph. If I were to take my boat to sea level from 5k feet I would personally go from a 19p to a 21p. That's just a ball park. It'd probably be better at a 22p at sea level but I would have to experience it! That 6.2 (377) is a running machine! It supposedly was designed to replaced the 7.4 (454). It is lighter and produces more HP (310 vs 320). It revs higher as well, 5600, I think. Just a tid bit for you. (I personally liked that option for a motor) Sent from my DROID RAZR HD using Tapatalk 2 |
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