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Old 03-22-2017, 09:52 PM   #38 (permalink)
craysus
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Perhaps simplify your thought a fraction..

Adjust the cylinder head combustion chamber profile based on the timing requirements..have a lower compression at TDC, and increase the compression a few degrees after TDC...this would effectively perform the same function as your sprung piston?

CSRV vs. Poppet Valve - Coates International Ltd.

Using a cammed intake system similar to above, and taking changing the profile based on simple rotation. You could imagine taking this to the next phase, and implementing a Wankel style interface as the cam, instead of the twin cams used byu coates...and therefore simplifying the movement down even further..

Alternatively, electrically controlled "valves" could be utilised on a more conventional head...and if the valves opened / shut normally, but could be extended INTO the cylinder, to increase compression at the desired part of each scycle..(Making the valves a solid tube to take up volume..maybe twisting open / closed to vary between a solid tube and a fuel delivery / exit path)

Just some random thoughts to help with overcoming the requirement for 4 x truck springs being inside a 4" cylinder bore.. (Havent invented a Tardus as yet...sorry..)...
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