[Tigers] FW: The Ultimate Duraspark Distributor Timing Guide.
Tom Witt
atwittsend at verizon.net
Thu Oct 26 10:39:34 MDT 2017
A rather comprehensive article though it was a bit confusing when it when it referred to a car going up a hill and driving on a steady flat road.
“In other words this is an engine-load dependent advance. This would be a typical situation when climbing a steep hill, or driving at low rpms, light throttle, conditions. In these conditions there is high engine vacuum, so the vacuum signal applied to the diaphragm in the canister, via the hose, will cause a 'pull' effect on the arm, which moves the breaker plate and results in a timing advance.”
I’m not seeing the high vacuum stated when going up a steep hill. The throttle is likely wide open (or there about) and the result would be a drop in vacuum. And at first I thought they might be contrasting the differences, but the next sentence states “In these conditions there is high vacuum...” and that has the appearance of stating they are similar.
Step 6
install the springs from the recurve kit and bend the tabs to keep tension on both springs so the advance shaft returns to its idle position
This (“Step 6”) to me is one of the most important reasons proper attention should be used to set up the distributor curve. Often people will just throw in weaker springs that can create (additional) advance at idle. The end results will be an increased amount of initial advance and if compensated but reducing the initial advance then the net effect will be reduced total timing. It’s the old “dog chasing its tail.” The spring tension needs to be set so as to not induce any advance at idle, yet not so tight it negates the effect of the weaker springs. At the least (when done “in car”) the springs should be changed with the initial advance being known and the distributor locked down. Then the spring tension adjusted until at idle the timing is back to its previous initial setting. This should also be “stepped” into so that there is enough, but minimal tension to achieve the desired results. Ideally a distributor machine would be used. While the article addresses this it seems to get somewhat lost in the article length.
I guess this is the point where many chime in to just $pend the money and go with an M$D or similar electronic system. But, that wasn’t the point of the article. And some people desire the stock appearance but want to maximize their engines capability.
From: Jerry Mo Christopherson via Tigers
Sent: Wednesday, October 25, 2017 11:53 AM
To: Tiger Autox
Subject: [Tigers] FW: The Ultimate Duraspark Distributor Timing Guide.
Here is an article that a lot of you know very well, BUT for those that still have questions on ignition timing this is well done.
(The Duraspark distributor is my distributor of choice).
Jerry Christopherson
9473187
TAC insp.#58
Subject: The Ultimate Duraspark Distributor Timing Guide.
http://vb.foureyedpride.com/showthread.php?22229-The-Ultimate-Duraspark-Distributor-Timing-Guide
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/tigers/attachments/20171026/1777646a/attachment-0001.html>
More information about the Tigers
mailing list