2005 Sea Ray 420 - 480CE fuel burn difference

Damn...she's GOOD! Best Fuel flow system ever!

 

I find that every single post on this subject over the years, it's always the port engine burning slightly more fuel.

 

The port gear takes a bit more HP to turn driving the boat forward.

 

Why am I always the exception, lol. My boat didn't get the memo I guess.
Everything about my starboard side is slightly more. EGT, Boost, gear pressure and, if not running the gen, fuel burn. But ever so slight. Usually within a couple of gallons on a 200 gallon fill up.

 

Explain?

 

The rotation of the port propeller when moving the boat forward is through the gear's countershaft which consumes more power to drive through the extra gear sets rotating the gear in a reverse (for lack of a better term) direction. The countershaft always rotates but is not the drive path when the gear is normal rotation as in the starboard side.

 

That makes sense

 

For v-drives. Port prop turns the same direction as engine rotation on straight shafts. Starboard turns backwards. Must be why I’m the exception.

 

My port engine burns more fuel as well. I got them dialed in right around where suggested @2200 and they purr. I’m running 23x25 props.