[TR] distributor advance

DAVID MASSEY dave1massey at cs.com
Sun Mar 1 06:34:45 MST 2020

 Wouldn't stiffer springs give you less advance at idle and, hence, more advance at speed?

-----Original Message-----
From: Peter Arakelian <peterara at msn.com>
To: Tony Drews <tony at tonydrews.com>
Cc: triumphs at autox.team.net <triumphs at autox.team.net>
Sent: Sat, Feb 29, 2020 2:02 pm
Subject: Re: [TR] distributor advance

#yiv4781498517 #yiv4781498517 -- _filtered {} _filtered {} #yiv4781498517 #yiv4781498517 p.yiv4781498517MsoNormal, #yiv4781498517 li.yiv4781498517MsoNormal, #yiv4781498517 div.yiv4781498517MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;} #yiv4781498517 a:link, #yiv4781498517 span.yiv4781498517MsoHyperlink {color:blue;text-decoration:underline;} #yiv4781498517 .yiv4781498517MsoChpDefault {} _filtered {} #yiv4781498517 div.yiv4781498517WordSection1 {} #yiv4781498517 I should have done this from the start.  checked the Bentley manual.  Lists my distributor and the advance specs.  Shows centrifugal advance at idle of 0-2 degrees on the crank.  So my stiffer springs are advancing too much initially, which will reduce the amount of extra advance I get at speed..  Will change back.   Sent from Mail for Windows 10    From: Tony Drews
Sent: Saturday, February 29, 2020 10:16 AM
Subject: Re: distributor advance   I'm not saying all advance is used at idle, but what I'm saying is that when all the mechanical advance is used, you're at a different advance setting than before (you had to change the timing after changing the springs, so when you do that the full advance amount changes correspondingly).  I'm unclear which direction it changed.  Your "at 3200 RPM" observation would almost always be at full advance regardless of which springs you're using.Stiffer springs should equate to less advance at idle than before I'd think.Regards, Tony DrewsOn 2/28/2020 8:09 PM, Peter Arakelian wrote: 
Tony, if I follow you correctly, you are saying that by changing the springs I may have made it so that all the mechanical advance is used up at idle and I may have no more at speed.  Where with the older springs I would get mechanical advance later in the rpms and so have more advance at speed. Would the marking on the weight of 13 degrees indicate its maxium advance?  If so, I suspect I may in fact be using all the mechanical at idle since my idle timing jumped past the pully markings and I can only estimate a 10-15 degree jump. Maybe I should go back to the old springs.   
>>The springs should just change what RPM it takes to get to full advance 
but the full advance should be the same (weights against the stops).? 
I'm a little unclear on how much you changed the timing, it sounds like 
you had to retard the timing after the spring replacement - this would 
also retard the "all in" timing, which would be what you're running at 
3200 RPM.? It's possible it's worse at 3200 now than it was before 
because the full advance timing is now less.<<    ** triumphs at autox.team.net **

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