Thread: Outboard and Prop Information

Here is a handy chart I have used for years. Handy to have something like this on hand sometimes. I scanned the picture, so it ain't beautiful. Print it out and stick it somewhere.:rolleyes:

Tom






Cane Pole is having computer trouble so his chart is not available right now. I am adding these links so you guys will have some other resources while his chart is down.

Good information, diagnostics and tests for the VRO system in OMC "johnnyrude" outboards.

boatpartstore


Same as above but different wearhouse...looks a bit different but same information as above.

tenkillermarine

Very basic outboard troubleshooting chart. This gives you a few things to look at and check "if this" happens.

Troubleshooting Chart

This is a great site and very informative. You can also order literature or even speak with the "mastertech" to get advise on your outboard.

Mastertech Website

Everyone should print the next one out...this is by far one of the most complete guides I've seen. Goes from cooling, fuel, ignition, troubleshooting, service, charts, and has some GREAT illustrations. This is a great read!! By the way it is a PDF file you will need adobe viewer to see it...you should have that...if not its free.

Coastal Engineer Training Guide

Very simple 10 point checklist for troubleshooting

10 point checklist

Engine Frequently Asked Questions (FAQ) - iboats Boating Forums

Very helpful from iboats.com quite a few various questions that get asked alot.

We will also add to this as we go along...waterpumps...decarbs...carb rebuilds...prop selection...things that get asked alot.

Feel free to add anything to this you would like. Anything that you see gets bounced around alot...please just add links (url) so we make the thread easier to navigate.

Decarbing Your Engine- The Process-HOW AND WHY - iboats Boating Forums

One of the best explainations and how-to's of decarbing your outboard. A GREAT read for just information if you already do decarbing and put an additive in your fuel.

BoatUS.com: BoatTECH Guides

[QUOTE=Scrapper;659335]Engine Frequently Asked Questions (FAQ) - iboats Boating

I have a 2018 express xp170 with a Yamaha 70 4stroke I have a 13p power tech prop on the motor an the boat will run 34mph and doesn’t struggle to plain at all but I was chasing ideas about a little more speed maybe 36-38 if possible without losing to much hole shot any ideas on a prop???

[QUOTE=Rosssanders;4163168]

Originally Posted by Scrapper

Engine Frequently Asked Questions (FAQ) - iboats Boating

I have a 2018 express xp170 with a Yamaha 70 4stroke I have a 13p power tech prop on the motor an the boat will run 34mph and doesn’t struggle to plain at all but I was chasing ideas about a little more speed maybe 36-38 if possible without losing to much hole shot any ideas on a prop???

Check your RPM. You want to be within the top 200 rpm of your motors optimal operating zone. You'll gain 200-400rpm by going to a smaller pitch prop, and lose 200-400 by going to a bigger pitch prop. If you are already near your max rpm, you can go up a prop pitch or two (14-15p) and will gain more top end speed but lose some holeshot speed.

Going to the fx4 (4 blade) prop will help you keep your holeshot up while going to a bigger pitch prop for more speed. It will also give you more stern lift if you have batteries or a lot of weight in the back.

You cant really choose a prop without noting your current RPM when WOT and fully trimmed though. Yamaha offers a prop selection tool on their website that you may find helpful. http://www.yamahapropselector.com/

Mercury Propellers | Prop Selector


This link takes you to the mercury marine prop selection page...this is a GREAT utility for picking the right prop for your application.

Next Link is Turningpoint "Prop 101" Lots of great information and another selector. Thanks PanMan VA

Propellers 101

If you have any questions about it or picking a prop please ask...this is a great place to start though. It will get you in the right direction. Just follow the links and plug in your information.

There are WAY more props of course than the merc props but they are some of the best and with the newer hub setups can be used on most rigs. Correct propping is the biggest problem on most boats....people compensate with whale tales and foils...for the best performance of any boat...it must be propped right...ventilated right....and the engine set at the optimum height on the transom...all these things effect the way the boat handles, comes out of the hole, and top speed.

Hope this link helps you out...I will be adding others as we go along.

If you have any helpful links please post the url.

PVS system...(holes or plugs in your prop and purpose)

Mercury Advantage

Merc Prop Holes

Prop Modification

Acceleration Factors



Props Fundamentals

Measuring motor height


How a prop is made

Let me know if the above link doesn't work

Super post, Scrapper. Some great information. I especially liked the youtube clip of the making of a prop.
"gene

Very nice post Scrapper. You have been a great addition to this site! Keep it up!