Prop for older 20hp Mercury - Colorado Fishing Forum

Reply
 
LinkBack Thread Tools
Old 08-22-2016, 12:52 PM   #1 (permalink)
Member
 
Join Date: Jul 2009
Posts: 71
Default Prop for older 20hp Mercury

So I wasn't paying attention to the depth and ran my prop into some muddy/gravel bottom yesterday. Luckily didn't break it but put a few dings in it and definitely affected the top end speed. It was the original 3 blade aluminum prop so I guess it's time for a new one anyway. Looking for suggestions for a new one. I run a 14 foot aluminum lund and the motor is an early '80's 20hp mercury 2-stroke. I usually fish between 4000-8000' in elevation. I'm more interested in top end speed than quick starts. Does anyone have a suggestion for an all around prop for this? I looked for some earlier posts and found a couple but really just trying to see if anyone has suggestions without getting too technical. Thanks for any input you can give.
carroth is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 08-22-2016, 01:43 PM   #2 (permalink)
Senior Member
 
Join Date: Feb 2005
Location: Windswept Plains of Colorado
Posts: 16,213
Default

The Internet is your friend-
__________________
Love Me or Hate Me-
Rugged and Beautiful.
All Metal all the Time!
slayerfish is offline   Reply With Quote Quick reply to this message
Old 08-22-2016, 01:55 PM   #3 (permalink)
Senior Member
 
Join Date: Feb 2005
Posts: 2,857
Default

If your current prop gave you good service just go with the same diameter and pitch
A slightly higher pitch may give you a little better top end but on a 20 hp not much. If you could get a tack I believe you want 5200-5400 rpm at full throttle.

And don't give up on your current prop-you can hammer out those dents and have at least a good spare-I've done
that many times on my boat.
__________________
You're not drinking alone if you have a dog.

Advice. Wise men don't need it, fools won't heed it.

Last edited by kirbydog; 08-22-2016 at 01:59 PM.
kirbydog is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 08-23-2016, 05:51 PM   #4 (permalink)
Senior Member
 
Bionic Man's Avatar
 
Join Date: Dec 2007
Posts: 3,511
Default

Jim's Prop Shop in Wheat Ridge can likely rebuild the prop you have.

If you are going to play around with different pitches without knowing your current RPMs, you should consider buying local in case you need to return it. I know a very small change in pitch has a huge effect on hole shot for my 60 HP on my Lund. Using my Powell prop (only 2" pitch larger) than my regular prop can keep me from planing out with 2 people and a full live well.
Bionic Man is offline   Reply With Quote Quick reply to this message
Old 08-26-2016, 12:21 PM   #5 (permalink)
Member
 
Join Date: Jul 2009
Posts: 71
Default

I took one of those worksharp knife sharpeners to the original aluminum prop and cleaned it up pretty good. Figured out it is a 9 pitch. Anyone else have a similar boat to mine and have recommendations? I've been looking on the internet and I think I'm more confused than ever. Seems like a 9 pitch is the equivalent of more torque. Thinking of getting an 11 pitch for the new one to try getting a little more top end speed. Any thoughts? Thanks for the Wheatridge tip but I live in New Castle and no plans to go to Denver anytime soon. It doesn't look like there are too many options for this old motor anyway so i might just get an 11 from Cabelas and return it if I don't like it.
carroth is offline   Reply With Quote Quick reply to this message
Old 08-26-2016, 03:45 PM   #6 (permalink)
Senior Member
 
Join Date: Feb 2005
Posts: 2,857
Default

An 11 will give you better top end assuming you can still get on plane with one. Worth a try-you may find that the 11 works better at lower elevation lakes and a 9 pitch at higher lakes.

For years I have had three pitches on my CO metal boat-an 11, 13 and 15.
__________________
You're not drinking alone if you have a dog.

Advice. Wise men don't need it, fools won't heed it.
kirbydog is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Colorado Fishing Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in


Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mercury Trophy Plus 21 pitch prop FS lunkerpunker Buy and Sell 0 08-16-2015 09:06 AM
mercury prop dick Buy and Sell 0 07-22-2014 09:10 AM
Mercury ss Lazer II Prop dwainarvada Buy and Sell 3 04-22-2009 12:55 AM
19P Mercury Aluminum Prop Cheap! Unused! coloradoman25 Buy and Sell 0 08-01-2007 11:35 PM
anyone work on older mercury outboards ? maestasj Buy and Sell 5 06-02-2005 02:11 PM

» Forum Search
» Insurance
Powered by vBadvanced CMPS v3.2.3

All times are GMT -6. The time now is 02:59 PM.


Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.0 PL3
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.