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I think the last thread about it said that the springs should be able to handle 65 so 50 would be a safe bet. One guy is running 35psi, I think I would start there watching the pyrometer and try stepping it up a little at a time. I would be real happy being able to run 45psi as that's still...

have you ever seen the graph of valve height throughout the 4 strokes? Cam profile, timing, and overlap play a huge role in the behavior of an engine that is not under power. This does not translate to pumps designed specificly for generating vacuums which are usually multi stage pumps...

it isn't operating inside of a vacuum, it is removing the molecules to create a vacuum with every stroke of the piston when the trottle plate is closed. That process requires a lot of power. you really have to think of it as pressure differential on the inlet and outlet of the pump. with a...

a strong throttle plate int he exhaust with a turbo charger external wastegate plumbed in to bypass the throttle plate. the spring rate of the wastegate will determine the max backpressure of the brake. simple and safe. then you just have to decide if you want it to be electronic, pneumatic...