Blanchimont wrote:
For 2015 there is a little change in the regulations. Is this of any importance for a supercharged engine?
"5.9.3 Variable length intake trumpets are forbidden in 2014 only."
using near-stoichiometric mixture needs only about 0.8 bar of supercharge (intake trumpets behaving as a 1.2 bar atmosphere)
variable length intake trumpets would be then be valuable (allowing a lower supercharge and less spoolup/more recovery)
though if a user of this mixture also used more supercharge and more 'back pressure'
these benefits (of variable length trumpets) could also be worthwhile (if recovery was not already at the mu-k power limit)
a much leaner-running engine would need a high pressure (Renault have quoted 3.5 bar abs ie 2.3 bar supercharge)
the benefits of variable length trumpets could also be worthwhile' (if recovery was not already at the mu-k power limit)
people have calculated the supercharge power at over 100 hp ? in this case, so at some rpm the benefit might be 15 hp ?
the ideal gu-h recovery would depend on the gu-k recovery, many tracks will not reach the energy use rule limiting gu-k recovery
M-B invented the variable length trumpet, for the 3 litre ('prototype sports') car in 1955, though they didn't race it
