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Which Lower/gear to use?
Thread Starter: bbezok
So I want to have a lower unit coned to run on the Viper I'm re-coring for next season. I currently have three to choose from, small bullet off an XR6
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26 trophy plus
Thread Starter: Nevelle
26 trophy plus. No nicks, 9.5/10 condition. $500 shipped

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1989 220hp Laser Pump not working..
Thread Starter: 86vintage
Hi I installed an after market high pressure pump and it is not pumping. the pump is marked - and + and not sure which wire goes where. if I swap them
Last Post By: TEXAS20225 Today, 02:09 PM

Iso
Thread Starter: tabme
Looking for a 4 Blade Thru Hub 23 pitch SS Prop for a Mercury Fat Shaft Lower. Thank you
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3.0 litre Sportmaster Vent Kit...
Thread Starter: sosmerc
Anybody here running the 3.0 litre lower unit vent kit?? If so, what do you think?
I have a go-fast customer with a 300 ProMax w/Sportmaster
Last Post By: jmatak9 Today, 01:54 PM

2013 300XS for Sale
Thread Starter: CCSO8274

2013 300XS, 270 hrs, #6 cylinder is shot, 40 hrs on 1.75:1 Sportmaster, includes the following:
steering helm, hoses, steering cylinder
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Performance Tech
Tech Guide: Wiring Your Boat The Right Way
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Published on 08-08-2018 11:30 PM
A Complete Guide to Marine Wiring ▼

This article was originally published on Scream And Fly back in 2004 on our old website. Like most tech-related articles, they don't lose their relevance over time, and I think that is especially true of this one. I cannot overstate the importance of proper wiring, both for performance, as well as safety.

The electrical system of your boat is its lifeline. Every system on the boat depends on it, including the engine, yet it is often neglected or its importance is underestimated. You need reliable gauges and wiring to monitor engine operating status and other vital information. Since your wiring is the only link between your gauges and engine, faulty wiring could cost you a lot more than just an afternoon and a spool of wiring. We enlisted the help of Marine 2000 located in Long Island, New York to assist us in illustrating proper marine wiring techniques.

...

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Porpoising - Why It Happens and How To Fix It

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Published on 02-02-2017 05:53 PM

Performance Tech: Why Does My Boat Porpoise? ▼

By Jim Russell, P.Eng

Wouldn’t it be nice to be able to know why your boat has a tendency to porpoise? And nice to know how you can improve or eliminate a porpoising problem? The causes of porpoising and how to correct it are frequently mystifying accounts. Here is an explanation of porpoising, how to design to mitigate the potential for porpoising and how to fix it when it’s a problem.

What is Porpoising?
Porpoising is the cyclic oscillation of a boat in pitch and heave, of sustained or increasing amplitude, occurring while planing on ...

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Gearcase and Propeller Blowout - Why It Happens and How To Fix It

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Published on 03-10-2016 01:34 PM Number of Views: 34100

By Jim Russell, P. Eng, Aeromarine Research

I receive many questions about the cause and effects of "blowout". Here is an explanation of blowout and causes and cures.

Most all high-performance boaters have experienced the circumstance that restricts their maximum velocity to less than it could be, even though they’ve got the horsepower available to use. This phenomenon is commonly called "gearcase blowout” or "propeller blowout".

Blowout occurs when something causes air/water mixture in the region of the propeller to become sufficiently disturbed that the ...

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The Bottom Line: How a Pad Makes a Vee-Hull Faster

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Published on 11-13-2013 08:33 PM

By Jim Russell, Aeromarine Research

The Vee-bottom hull is the most common design in modern performance powerboats. The Vee design has a number of variations and near-endless modifications – including the pad-vee design - that can enhance particular handling characteristics of the boat. If going fast is the objective, it’s worthwhile knowing just how a vee pad can affect vee hull performance.

I’ve had many inquiries about vee hull modification, vee-pad hulls and pad modifications. High performance vee pad hulls must be carefully designed for each boat, as the balance of lift from the pad is crucial. The good news is that there are ways that we can engineer our way to the best performing ...

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A Walk On The Wild Side: Chine Walking - Why It Happens and How To Fix It

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Published on 02-13-2013 12:11 AM

Chine walking can arise with any high performance vee-hull. Chine walk is an aggressive, often rapid, side-to-side oscillation of the hull. Acute cases of chine walking grow more severe by themselves – called a “self-excited oscillatory instability”. Really severe cases can see the boat bouncing from one chine to the other chine – and some hulls can chine walk in the middle of a turn! It can be a scary ride for even the experienced pilot. So let’s explore the facts of “chine walking” – why it happens ...

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