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cougar wrote:I'll just throw this out there. Instead of controlling case pressure, why not control the timing piston's travel through varying the spring tension. Most of us are familiar with the M&H dynamic timing device. It includes a cap spacer and a washer. Modify the cap so you can put a threaded rod and a seal in it, kind of like a fuel pin. The inside end of the rod will push against the washer. As you turn the rod, you will be changing not only the preload on the spring but the amount the piston can travel. Attaching a lever to the rod connected to a pneumatic cylinder run by regulated boost pressure and I think you're close. Fine tuning required of course.
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