As seen in Speedboat Magazine’s
Nov/Dec 2023 Issue.

High Horsepower
Carbureted Fuel System

Dear Bob:

I have a pair of older TCM 800 carbureted supercharged engines in my 382 Formula FasTech, which also has been converted from the original XR drives to Arneson Surface Drives.

I need to change the mechanical fuel pumps that are mounted on the engine blocks. The pumps have a label on them that says “Edelbrock.” Which Edelbrock pump should I use? Currently, the boat also has an electric Holley fuel pump as part of the system. What part numbers do I need for the mechanical and electric pumps? Can I do away with the electric fuel pump and just use a higher-volume mechanical fuel pump? Thank you!

Randy Davis
Stafford, VA

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As seen in Speedboat Magazine’s
Sept/Oct 2023 Issue.

CORRECT
Distributor Gear

Dear Bob:

I bought a Crane Cam in 2014. It is part number 139021 and has the iron gear. Do I need to use a melonized distributor gear
with this camshaft?

Thanks for your help.

Chad White
Campbell River, British Columbia, Canada

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As seen in Speedboat Magazine’s
August 2023 Issue.

AERATORS:
Pros and Cons

There have been quite a few discussions
on social media and the boards regarding the benefits, advantages, and downsides of using prop aerators on boats equipped with surface
drives. I have been personally involved in the development, design, and manufacturing of various aerator kits since surfacing prop sterndrives were introduced. In this article, I will provide the history of the development and evolution of the various aerators that are available. While aerators may not be indicated on some boats, they provide significant benefits on boats that have engines with lower bottom end power using higher pitch propellers and higher gear ratios (less reduction).

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As seen in Speedboat Magazine’s
June 2023 Issue.

Leaning Left

Dear Bob:

Q. I have a brand new 28-foot catamaran
with a single Mercury Racing 600SCI, Mercury ITS, and a Mercury XR Sportmaster drive running a 28 pitch 4 blade Mercury propeller. This is my first Catamaran. With just a driver and passenger the boat has a noticeable lean to port when on plane at any speed. I realize this is caused by propeller torque. At the direction of the boat manufacturer, I burn the fuel out of the left tank first to help the boat ride more level. My question is: What else as a driver can I do to alleviate this lean? Would a set of trim tabs help or just create another problem? Any advice you can give would be greatly appreciated.

Tom Epley
Lake Havasu City, AZ

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