Turbo camshaft profile design
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Turbo camshaft profile design
For some time I've known that turbo camshafts should avoid "symmetrical" timing characteristics - the reason being that a resonant frequency can be reached which causes pulsing and ultimately turbine failure. Having just accepted this I frequently now see that turbo camshafts run against the grain and indeed run symmetrical profiles.
Am I wrong or is there some secret to head/mainfold design that makes this old wisdom redundant?
Is it just that the "odds" of the resonant frequencies being reached are so incredibly small and minor in effect that it just isn't worth worrying about?
Am I wrong or is there some secret to head/mainfold design that makes this old wisdom redundant?
Is it just that the "odds" of the resonant frequencies being reached are so incredibly small and minor in effect that it just isn't worth worrying about?
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Dunno about this one Julian, but certainly the natural frequency of turbine blades is way above that of any engine order.
Pulse tuning - the only pressure wave/frequency related issue I know of with turbocharged units is about using the pressure waves to enhance the cylinder pressure around bdc in precisely the same way it is done on normally aspirated engines with interference exhaust headers.
GC
Pulse tuning - the only pressure wave/frequency related issue I know of with turbocharged units is about using the pressure waves to enhance the cylinder pressure around bdc in precisely the same way it is done on normally aspirated engines with interference exhaust headers.
GC
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