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  Which prop for a 90 4 stroke?

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Author Topic:   Which prop for a 90 4 stroke?
NewWhalerGuy posted 06-22-2002 03:57 PM ET (US)   Profile for NewWhalerGuy   Send Email to NewWhalerGuy  
I have a 97 Montauk with a Honda 90 (new) on her. I am currently running an aluminum 12.75 x 17 4-blade prop. I find the top end a bit wanting and she almost revs out to maximum. (i.e. more pitch room available) What are others running on their 90 hp 4strokes on montauks?
FISHNFF posted 06-22-2002 05:50 PM ET (US)     Profile for FISHNFF  Send Email to FISHNFF     
Your Honda is running a Merc #13 2.33:1 lower unit. A test report of your combe was in SaltWater Sportsman in 1997? sometime and they ran it with a 19". The report stated Honda running a 20" on the combo for almost 48MPH. Remember the testing most manufacturers do is with minimal equipment. The test, if I remember right, had 2 aboard with 6 gallons fuel. If I find my mag, I'll post the findings.


NewWhalerGuy posted 06-22-2002 08:17 PM ET (US)     Profile for NewWhalerGuy  Send Email to NewWhalerGuy     
Yes, and this is a 4 blade... most of the articles I saw were running 17 or 19 3 bladers... also do you think aluminum makes a big difference on a 90 (other than the impact on MY wallet)... thanks in advance
jimh posted 06-23-2002 09:08 AM ET (US)     Profile for jimh  Send Email to jimh     
I don't think the use of stainless steel for the prop material is what makes some stainless steel props perform better. It is the design of the stainless steel props.

I think that most of the performance props are produced in stainless because the designs have thinner blades. Or conversely, if the same design propeller were to be made in aluminum the durability might not be as good because of the lower material strength of the aluminum.

The improvement comes not from the material of the prop, but from the design. It is the design which then makes stainless steel the better material to use in casting the propeller.

By the way, I find it interesting that the Honda has a Mercury lower unit. People are often quick to point out when Mercury uses someone else's powerhead. Other brand owner's don't seem quite as forthcoming about acknowledging the Mercury parts on their engines.

Ogden Dunes posted 06-28-2002 06:03 AM ET (US)     Profile for Ogden Dunes  Send Email to Ogden Dunes     
I just repowered with a 100 4 stroke Yamaha. I put on a Turning Point Express 13.25 dia 19 pitch stainless prop. I am turning 5900 rpm at a speed between 44 and 47 mph GPS. I suppose I could swing a 20 or 21 pitch prop but I dont want to loose out of the hole performance for water skiing, tubbing and wake boarding. These 4 strokes sure do have the lower end torque. I repowered from a 85 Jhonson and what a difference in the torque.



FISHNFF posted 06-28-2002 02:05 PM ET (US)     Profile for FISHNFF  Send Email to FISHNFF     
Glad you love your Yama 100 4S. I have a Merc 90 4S ( same as yours but with a 2.07 lower unit) and ran 46MPH GPS with a 19" SS and no load. Now rigged for fishing I hit about 40 with a 17" SS Ballistic prop. I really think the 2.33 lower unit would work best with these motors. My previous 1996 Merc 75 2S had more snap (torque) than the 90 4S, but the 90 is faster , smoother, quieter, and better on fuel. Rumor has it Merc will be putting on the 2.33 lower unit and EFI? for 2003.


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