Re: non-roc (audi A4)

[Brad Sheridan <brads@mindspring.com>]

At 10:50 AM 8/18/99 PDT, you wrote:
>A distributor is basically a switch that closes when you want charge to go 
>to the plug.  What these distributorless systems do is forgo the mechanical 
>rotating contact and replace it with transistors.  A distributorless system 
>would have a FET for each cylinder which would only be turned on (and allow 
>current to flow) when you want spark. 

Minor correction. You turn the FET(I think many actually use IGBTs, but
same on/off principle) on to start current flowing, and creating dwell for
the magnetic field in the coil to build up. When you turn the FET off, the
collapse of the magnetic field in the coil causes the spark. 

Brad


--
To unsubscribe, send "unsubscribe scirocco-l" to majordomo@scirocco.org.
If you experience other problems, email: scirocco-l-probs@scirocco.org