I want to clear up something that seems misunderstood by some people on the List. As long as there is at least one spring in the distributer on one of the weights the mechanical advance works. In some cars (not Deloreans) there are 2 springs and in some cars the springs are different (ie they are not both the same). Same with the weights (they are not always identenical). The spring is there to keep the advance from coming in till a certain RPM AND to return the advance back to 0 below the target RPM. If there is a second spring it gives a "knee" to the advance curve, essentially preventing additional advance until a certain RPM is exceeded. The other point I want to make is on Deloreans it is the ONLY car I know of that does not have a different advance set-up for the automatic verses the 5-speed. Generally the manual version would have a much faster advance curve than the automatic mainly because of the torque multiplacation provided by the torque converter. For further information get out the Workshop Manual and a timing light and watch the advance as you increse the motor speed. Disconnect the vacuum to only see the mechanical advance. You should see 20 degrees of advance. that means if your base timing is 13, add 20 and see 33 degrees. Reconnect the vacuum and you should see a total advance of 13+20+20 for a total of around 53 degrees BTDC. You can plot the advance at every 1,000 RPM to see what it is as it comes in too. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> wrote: me a driveability issue until replaced. Thanks, Rick > > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/