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Published on 05-22-2020 03:27 PM
Evinrude's 1932 catalog is particularly large and comprehensive, and in my opinion, one of the most interesting and detailed in their early history. The product range covers the Sportwin 4HP up to the four-cylinder 36HP Speedifour.
In 1932, a four-cylinder production outboard engine making that much power was state-of-the-art in marine technology. Just as interesting to me is their Propello-Vacuum cooling system, which utilized hollow cavities in the propeller to create suction that pulled water into the lower unit and through the engine for cooling. Not counting the propeller, the system had no moving parts. But of course, this system could only function on an engine that had no neutral or reverse gearshift. Once again, keeping in mind that this was almost 90 years ago, options such as a pressurized fuel primer and compression relief for easier starting were impressive on a consumer product.
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Mercury top pinned 2.5 Efi pistons and heads 19cc and 34cc, Big bearing efi front
Thread Starter: superboattwin250Hey guys , I have a bunch of used pistons and heads for a Mercury 2.5 efi race engines
Last Post By: tabme Today, 04:20 PM1- big bearing EFI front half. Does have 2 small