Dan Riley

I am not seeing the advance springs listed. Where do the rebuilders source their springs?

71-3.0-911

I thought that there was a whole thread here that listed parts for the entire distributor, including the hard to find bearings. No insult intended but did you try searching?

-Scott

Dan Riley

I will look closer as to the search results...thanks.

Dan Riley

Nope. Alot of distributor rebuild conversion but no discussion of advance return spring part numbers. I was rebuilding my distributor with all of valuable info, pics etc. I found here on RL. I feel my return springs are not very elastic but lazy. After 26 years I thought a new set of springs would be appropriate for my favorite car.

Dan

IainM

If they're not corroded, I'd have thought the spring rate would be pretty much on spec. It's not as if they get stretched beyond elastic limit.
Then again with Motronic ECU + crank position sensor hard to imagine ignition advance is still handled by weights on the distributor.
How is the Hall sensor on the distributor used in the Motronic ignition?

I just cleaned and reused mine, no issues in 2 years.

Dan Riley

The spring advance/return timing mechanism does seem out of place with the OBDII ECU mastering the rest of the functions. I would have assumed the ECU would have rendered the spring advance/return long ago obsolete.

It appears using the WAG method that it seems to advance timing about 5 or so degrees. Spring stretch appears to be quite linear according to some spring stretch graphs I Googled. Age I would think would affect the linearity of or the start point of the stretch. I recall in my youth with the muscle car's point ignition that advance springs were a bit of a science of their own.

If I recall correctly, which may be in error, that the hall generator works as cam position sensor for the ECU.

If anyone has a source for the advance springs I would greatly appreciate if you would pass it on.

Dan

71-3.0-911

If you continue running into issues, it may be worth a call to Rothsport. They did my rebuild and many others, and can likely help out. I think Steve Weiner has retired but there should be someone who can help.