2003 8hp Merc...trying to find high altitude jets

[aaarneson]

Trying to find the correct jets for 6000 to 8000 elevation.

Ran at about that elevation this weekend and hardly any power compared to 1500-2000 elevation that runs at about 18mph.

SN: OT618494

 

[aaarneson]

Also I have a 3 blade prop and a 4 blade. The 4 was in at this high altitude....would the 3 blade be better?

 

[Fun Times]

Trying to find the correct jets for 6000 to 8000 elevation.

Ran at about that elevation this weekend and hardly any power compared to 1500-2000 elevation that runs at about 18mph.

SN: OT618494

You generally tend to find the altitude info inside a service manual for your engine model…, Here would be the part number you’d need… Maybe try searching the part number online to see if there’s a copy online already. https://www.mercruiserparts.com/827242r02-sm-o-b-6-15-2s

6 - 0G760300 THRU 0T800999

6 - 0G760300 THRU 0T800999

www.mercruiserparts.com

 

[roscoe]

3 blade or 4 blade means nothing without knowing the pitch of each.

any mercury dealer should have them.

The correct jet will balance the air/fuel mixture, and aid in running, but you will still experience a loss of power due to the air up there.

probably loose 1/2 of your power at 8000.
a properly jetted 15 hp is what you need.

 

[jimmbo]

Jets are not an item most dealers keep in stock(unlike spark plugs, they rarely need changing). If available, they can order them

 

[airshot]

Also I have a 3 blade prop and a 4 blade. The 4 was in at this high altitude....would the 3 blade be better?

Usuall they drop a couple inches of pitch when they move to a 4 blade prop, check yours...if same pitch or higher than the 3 blade, then you hurt your power output.