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Location:
Brisbane
Registered:
May 2002
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Re: Ignition timing on 18RGU
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Fri, 20 June 2003 03:37
 
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| BansheeBuzz wrote on Thu, 19 June 2003 19:14 |
vacumm is a term used regarding the air pressure between the butterfly and the valves. When the butterfly is wide open the pressure will return to almost atmospheric.
If the vacumm line for the dizzy is connected to the air filter side of the butterfly it will do nothing.
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This isn't strictly true. On many carby engines, the vac advance is hooked up before the butteryfly. Vacuum increases in proportion to engine load largely because of the venturi effect.
I'm not sure if the same applies to EFI engines, but vacuum certainly can exist before the butterfly, especially if the engine uses a flapper-type AFM.
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