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Author Topic:   S S Prop on 90 HP Merc 2 Stroke
Jimm posted 08-26-2002 06:22 PM ET (US)   Profile for Jimm  
I was wondering what the improvement in performance would be if I were to put the SS prop that comes on the Montauk 170 90 HP 4 stroke on the 90 Merc 2 stoke. Any testimonials, opinions or is it still too early in the life of the 170 for people to be looking for performance upgrades?
jimh posted 08-26-2002 08:03 PM ET (US)     Profile for jimh  Send Email to jimh     
I would expect no improvement.

There is a difference in pitch of five inches in those props.

I am reasonably certain that if you check the lower unit gear ratios you will find they are quite different. This has a big impact on what size prop is the proper choice.

Jimm posted 08-26-2002 09:34 PM ET (US)     Profile for Jimm    
Right you are. The 4 stroke is 2.07 to 1, while the 2 stroke is 2.30 to 1.

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