1985 90hp Mariner inline 6 RPM range

79Merc80

Senior Chief Petty Officer
Joined
Nov 22, 2007
Messages
673
Hey Guys/Gals:

I was curious about the RPM range of the 90hp inline 6.

Thanks, Craig
 

79Merc80

Senior Chief Petty Officer
Joined
Nov 22, 2007
Messages
673
Re: 1985 90hp Mariner inline 6 RPM range

What is it that keep the 90 at 4500 - 5000, and the 115 5000 - 5500?
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,618
Re: 1985 90hp Mariner inline 6 RPM range

Block intake & exhaust porting.
 
Joined
Apr 24, 2011
Messages
3
Re: 1985 90hp Mariner inline 6 RPM range

Thanks. 4500-5000 is what I thought. I also was wondering why so much lower then most 2 stokes. That was answered as well. Thanks-- One more Question--
Im running 4900-5000 rpms. She is a bullet out of the hole and tops out at 34 mph. I am usually up at 4500 to 5500 ft elevation if that helps. Would like to gain a little more top end. Any ideas ?
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,618
Re: 1985 90hp Mariner inline 6 RPM range

Boat set-up,engine height,prop brand,prop size,boat weight,type of hull all affect speed and handling. If your set up for skiing/tubing you will be slower than a set-up for fishing and speed.
 
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