The Miata guy brought it into the realm of DIY, but I don't see a solution that doesn't increase the overall width of the engine. Still there are those performance claims.
I had high hopes for the
Suderi Split Cycle Engine. But the inventor's heirs blew through the capital and folded.
They made their own proprietary inline four for test purposes. I think they could have developed on a VW flat four to their advantage. With differing cylinder sizes and custom crank offsets (maybe a roller bearing crank? Those are built up). Air reservoir for regenerative braking.
There exists an air compressor conversion, by Dunn-Right.
Quote:
dunnrightinc.com
Home [dunnrightinc.com]
This camshaft allows two cylinders to run in their original fashion (four cycle) and the other two to pump air (two cycle). These conversions use the original VW cylinder heads and valves on the pumping and running cylinders. This provides for a high speed, trouble free operation. All you need is a dual port type I or type III VW Engine!
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