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1979 115 What is Max RPM for this motor?

Discussion Forum at MarineEngine.com » Mercury Mariner Outboard » Archive through May 22, 2008 » 1979 115 What is Max RPM for this motor? « Previous Next »

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lou hadad
Member
Username: flyguy38

Post Number: 6
Registered: 04-2008
Posted on Thursday, May 15, 2008 - 10:31 am:   Edit Post Delete Post View Post/Check IP

I have a general question about the max RPM this engine will produce to match the prop pitch. I had a prop on the engine that topped out at 4300. I replaced that one for a prop with I believe a 19 pitch. To achieve the normal RPM of this motor should i have a 17 pitch on the motor to get max rpm?
Does anyone know what the normal RPM is? I've heard its 5500, is that right?
If i match all of this up right will gas savings go down or up?

Oh by the way this motor is so reliable, I love it! Just want to save gas with it, with gas prices climbing so high this summer.......
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IBNFISHN
Advanced Member
Username: ibnfshn

Post Number: 296
Registered: 11-2005
Posted on Thursday, May 15, 2008 - 06:05 pm:   Edit Post Delete Post View Post/Check IP

For max efficiency your motor should run between 5000 and 5500 RPM at WOT.

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