[Diy_efi] some pictures...
Mike
niche
Wed Jul 5 03:07:12 UTC 2006
ooooppps you are quite right, I was so hung up on turbine
squeal I didnt check my numbers, guh my bad
rgds
mike
At 02:13 AM 7/5/06, you wrote:
>In a message dated 04/07/2006 18:10:06 GMT Standard Time, niche at iinet.net.au
>writes:
>Ear cant discriminate anything useful beyond about 16,000 rpm, at that rate
>for a small turbo it wouldnt develop much boost, what you are likely hearing
>is low order oscillations, resonant cavity either inlet or exhaust but
>certainly not
>anything near turbo spin rate ! Much like the F1 motors, when they spin at
>19,000rpm,
>you dont hear the motors at all, you hear the gearboxes and the layshafts
>etc etc
>
>
>
>
>
>Mike, I'm puzzled. You may be right about the real noise coming from the
>gearbox etc, although having been close to "only" F3000 engines I don't believe
>you're correct. Where I want to query what you say is the maths about what
>the human ear can hear.
>
>A V8 turning at 19000rpm experiences 4 firing pulses every rotation,
>therefore 4*19000/60 pulses every second = about 1300 Hz. This is well within the
>human ear's response, wouldn't you agree? :-)
>
>I accept of course that it's not strictly relevant to the turbo rebuild
>theme, being 5 to 10 times slower than a turbo spins at.....
>
>Will
>Cambridge, UK
>_______________________________________________
>Diy_efi mailing list
>Diy_efi at diy-efi.org
>http://lists.diy-efi.org/mailman/listinfo/diy_efi
Regards from
Mike
Perth, Western Australia
VL Commodore Fuse Rail that wont warp or melt !
Twin tyres for most sedans, trikes and motorcycle sidecars
http://niche.iinet.net.au
More information about the Diy_efi
mailing list