Builders:
Here is part #2 of the Jump Start Engine series. This one will cover some background before we move onto details.
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18 months ago I wrote a 20 part series on “Getting Started.” The entire series can be found by clicking on this reference page: Getting Started Reference page.
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In that series, from part#5 to part #9 we looked at 5 different closed case options. The had alphabetized names, AA through EE. The Jump start engines I am proposing, with Gen II Weseman bearings, 8409 cranks and failsafe gears on OT-10 cams are most like the engine described as the third, or “Chas. Charlie” option. You can read about it at this link to part #7: Getting Started in 2013, Part #7, ‘Chas. Charlie’ Short Block.
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If a builder wasn’t to assemble his engine as a 3,000 cc Corvair, the case has to be machined to accept the larger cylinders. Specifically the six holes for the cylinder spigot bottoms have to be enlarged slightly. This need to be done with great precision. There is an older description of it at this link: 3,000cc Case Modifications.
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If you are thinking about which displacement you would like for your plane, you can read the “Getting Started” links about pistons and displacement. They are here;
Getting Started in 2013, Part #12, Piston Choices
Getting Started in 2013, Part #13, Basic piston/rod/cylinder combo.
Getting Started in 2013, Part #14, 2,850 cc piston/rod/cyl. Kits
Getting Started in 2013, Part #16, 3,000 cc Piston/cylinder kits
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That should be enough reading for one night. On to part #3 tomorrow. -ww.
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Above, a rear view of a 3,000 cc Corvair engine.
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