[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
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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




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