Quote:
|
Originally Posted by Wang
...yeh like the pneumatic lifters in F1 motors to reach... what 19000RPM?
|
The amazing (to me) thing is that they are still using tulip valves for this. You'd think that there's be a non-reciprocating solution. Tulip valves became "standard usage" in 1905 or so (first as inlet valves pulled open by suction, shortly later as the tops of pushrods in side valve engines). They
may have started out as steam-engine technology (amazing what's either come out of
that period - like shock absorbing bolt heads or been recently re-invented - like asymmerical fastener thread profiles, now NASA ultra-high-tech).
Anyway, the interesting part (to me) about the pneumatic lifters is that, like electroinic ignition or injection, you can adjust valve timings to suit the situation. Any kind of cam is a compromise (and if you look at high speed film you can see that the valve train is essentially doing a resonant thing and the cam is just "pushing the swing" - and the interplay varies with speed).