Reply To: Kylchap Exhaust Systems

[Chris Corney]

And now for my next question!
Given the advantage of the Kylchap on the “efficiency curve” principle described above, and if I’ve understood the explanation in Wardale’s book “Red Devil” correctly, the basis of the Lempor exhaust is the de Laval nozzle. These oscillate between supersonic flow/high back pressure during the “chuffs” and subsonic flow/low back pressure between the chuffs. Since the high back pressure more or less co-incides with the dead-centre position of the piston, it gives an improvement in efficiency.
I’m just mulling over what would happen if you combined de Laval nozzles with a Kylchap chimney.

Chris