On a plate..

Standard

At the bottom of the barrel there’s a spigot, which has a location protrusion. Rather than machine the top of the cases as originally planned,, Bob suggested we make a compression plate to fit, keeping the cases flat at the top. I like this idea as by skimming the plate, or making a few of various thicknesses, we can alter the compression ratio.

The original Hercules is only 7:1 as it was supercharged. This engine won’t be (at first 😉) but should run ok. With a sleeve valve engine, higher compression interferes with the valve opening times. The piston effectively gets in the way of the ports, much like with 2 strokes. Next job is to make the plate, so we can get on with marking & drilling the cases.

About Sophie Whiptank - aka Bart

I'm just a bloke doing some stuff, the more interesting bits I post on my blog. Scroll down far enough and you'll see me riding from Melbourne Australia to Birmingham, England in 2014. But now I'm working on another project, a single cylinder motorbike engine at 2750cc!

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