29-09-2019, 11:03 PM
(This post was last modified: 29-09-2019, 11:13 PM by Special Bits.)
(29-09-2019, 10:54 PM)Charles P Wrote: You can't change the actual opening times with different radius followers but you can alter the rate of opening, and therefore the volume of charge that can flow at low angular movements, albeit at the cost of higher valve train acceleration and therefore loading. Assymetic followers do exist and are really a way of compensating for the limitations of regrinding a cam onto a pre-existing profile.
Charles
Right, thanks Charles, my idle mind wanderings are often flawed!
(29-09-2019, 10:54 PM)Charles P Wrote: You can't change the actual opening times with different radius followers but you can alter the rate of opening, and therefore the volume of charge that can flow at low angular movements, albeit at the cost of higher valve train acceleration and therefore loading. Assymetic followers do exist and are really a way of compensating for the limitations of regrinding a cam onto a pre-existing profile.
Charles
Yes, just reimagining what's going on, you could potentially have the cam applying all of the lift in very few degrees indeed. The loads would be horrendous! I can see why the advice was always to maintain a radius. Maybe a flatter side could be used to shut the valve quickly, but then you need to keep it on its seat! Oh dear, I must stop pondering things that have already been pondered for 80 years! ha ha