Expensive and touchy—detonation, or the rear wheels re-contacting the ground, can re-index the crank on the fly. People TIG weld the parts together and break the welds. In a car with EFI, that keeps the wheels on the ground and isn't drag raced, they should survive.
But as a development platform it would be serviceable and much less expensive than Scuderi's approach. The offset between the compression and ignition cylinder is reported vaguely as somewhere around 15-22°. Once that is locked down, your 3D printed sintered-metal part with integrated roller bearings can be created.
The Dunn-Right website is a mess—parts with no price and price with no parts—but it looks like $340-380 for the basics, $6500 for a complete unit. They claim a redesign at some point:
Quote:
This challenge sparked the creation of the new generation of "Volks-Air"
compressors. These compressors, operating with a new concept, not only are
cheaper to build and produce more air but offer numerous other advantages.
These self-governing, auto-unloading units run with virtually no vibration.
Their lightweight design and high speed capability make them very efficient.
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I've got unlimited long distance phoning, I think I'll give them a call on Monday.