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Old    David Williams (wakeworld)      Join Date: Jan 1997       07-21-2010, 11:00 PM Reply   
A friend of mine has a boat with a four cylinder carbureted engine. He's going to be taking it to a lake that's about 7,000 feet higher in altitude than he normally runs it. He asked me if he needed to adjust the carb or prop and I didn't have an answer for him. What is the popular wisdom on this? Any help would be appreciated.
Old    Mikeski (mikeski)      Join Date: Aug 2003       07-21-2010, 11:06 PM Reply   
You can also advance the timing
Old    Sparky Jay (wake_upppp)      Join Date: Nov 2003       07-21-2010, 11:07 PM Reply   
A step or two leaner on the jets would be in order I believe since the air is thinner. Nor sure on the prop.
Old    David Williams (wakeworld)      Join Date: Jan 1997       07-21-2010, 11:10 PM Reply   
So he wouldn't get away with just leaving it as is?
Old    Sparky Jay (wake_upppp)      Join Date: Nov 2003       07-21-2010, 11:14 PM Reply   
Oh yeah it'll still run, it just wont be optimum. A little on the sluggish side. A slight lack of power feeling.
Old    Chris (cjh1669)      Join Date: Apr 2005       07-22-2010, 9:07 AM Reply   
You lose 3% of your horse power every 1000ft above seas level. So he'll be running about 21% down from whatever he is used to. I run just about 6000ft and had to go to the acme 1235 to help make up the difference in power
Old    David Williams (wakeworld)      Join Date: Jan 1997       07-22-2010, 9:18 AM Reply   
Wouldn't it make more sense to adjust the carb than the prop? That way the engine will still run efficiently. Otherwise, you're just compensating for a poorly running engine, right? I guess it also depends on how easy/expensive it is to change carb jets vs. changing a prop.
Old    Chris (cjh1669)      Join Date: Apr 2005       07-22-2010, 9:27 AM Reply   
Yeah, it's all price dirven, but you're going to lose power no matter what, even if you adjust the carb

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