As a layman in this particular field, I was interested to read about the developments in engine-valve technology in your article ’Driving engine efficiency’, but surely cars with VVT (variable valve technology) have been available in the market for some time now.
There was also an inventor in Cambridge, as I recall, who patented and developed a completely electrical system of valve opening and closing for IC engines, in which manufacturers showed an interest. It also addressed the problem of ’valve bounce’, which can be a problem at high rpm.
Ironic then, just as many are predicting the demise of the IC engine, that there seems to be so much development work going on – much of it reported in your excellent magazine. But would even a 30 per cent increase in fuel efficiency be enough to save the IC engine? I think not.
Anselm Kuhn, Stevenage