.poz wrote: ↑23 Mar 2022, 11:39
... The actual ICE, without fuel flow limitation, can exceed 1500bph
... racing turbo charged engines usually uses a lot of gas because they use a very rich fuel/air mix for cooling
... the actual ICE are designed to run poor fuel/air mix so probably a compromise can be found
.... what about water injection ?
IMO the above is old thinking (ie it's wrong in today's engines)
'very rich fuel/air mix for cooling' gave reduced flame temperature allowing more 'boost' without detonation
(because the fuel was largely unvapourised the flame front was cooled by fuel boiling ?) - said Sam Heron
but today's 400 bar direct injection leaves little fuel unvapourised
the overall gas temperature is set by the charge cooler so doesn't need cooling by in-cylinder fuel boiling
the 'poor fuel/air mix' isn't poor - it works by heat dilution
the surplus air having been efficiently provided
the lower in-cylinder temperature disproportionately reduces the necessary heat robbing by coolant
so disproportionately improving the in-cylinder energy content for conversion to work
'the actual ICE without fuel flow limitation' will need disproportionately more in-cylinder heat removed by coolant
so it won't make 1500 bhp
'water injection' only takes heat that is takeable by the charge cooler
in-cylinder water boiling will reduce the energy available for expansion
with today's F1 transmissions the 'turbo' could be coupled mechanically to the crankshaft ie no MGs etc
ok energy storage/deployment is quite good for racing