1978 v4 140 Johnson

[fins2theright]

Can anyone tell me what mpg's one could expect from this motor pushing a 1400lb mako 17?????

 

[ezeke]

Re: 1978 v4 140 Johnson

Properly propped for a maximum of 5800 RPM, The motor will run about 14 gallons per hour at WOT. That's a fairly typical ratio for carbureted 2 stroke outboards.

Everything else depends on setup, prop pitch, hull condition etc.

I can lose 20% efficiency in rough water when I have to use more trim for control while staying on plane.

 

[fins2theright]

Re: 1978 v4 140 Johnson

Thanks, any idea how much that figure would drop running around 4000 rpm?

 

[ezeke]

Re: 1978 v4 140 Johnson

Guessing that everything is in good shape, properly rigged and that you can hit 5800 RPM anytime you want to, maybe half if you are comfortably on plane and trimmed right.

I absolutely respect the Mako, and would take one to sea anytime. I also think the 140 crossflow is as good as any motor in its class because a backyard mechanic can keep it running nearly forever with a factory service manual and the right tools.

 

[fins2theright]

Re: 1978 v4 140 Johnson

thanks so much for the input. putting in a new 30gal. tank wondering if it will make it 17 miles offshore and back. thank's again, Keith