Re: Re: Re: rotor for 20v turbo engine

[C1J1Miller@aol.com]

In a message dated 11/6/98 7:31:35 AM, Glen_Powell@ne.3com.com wrote:

>The actual instant
>in time of the spark is totally controlled by the ECU regardless of the
>position of the rotor. The rotor must be in the correct physical position
>at this instant for things to work well, if it's off a bit too soon or too
>late then you will rapidly burn on the cap and rotor and get a very weak
>spark at the plug, if you get a spark at all.
>
>-glen

And, at very high rpm, my thoughts are the wider rotor could be off enough
from where the ECU thinks it is, that it could be allowing a spark at the
wrong time, or to the wrong cylinder, especially with modified computers using
large amounts of advance, near the 7000 rpm.  Even a slight fraction earlier
spark (due to the wider rotor allowing the spark to propagate to the plug wire
earlier than the specified rotor) could be too much.  

My point is/was that Audi went to the trouble of having bosch make a different
distributor rotor than that Audi used on nearly every other 5-cylinder
gasoline engine; this rotor has a metal tip that is not as wide.  I know of at
least one 3B engine that was destroyed due to what was thought of as a high
rpm misfire; the owner expressed that it may have been due to using the
10-valve rotor.
Oh, and the bosch rotor number ends with 1R (1k ohm resistance, I think).
Chris Miller, Windham NH, c1j1miller@aol.com