[TR] TR3 coil question

Frank Fisher yellowtr3 at yahoo.com
Thu Sep 17 15:07:58 MDT 2015

cant help with the coil problem
but inquiring minds want to know hp and torque

      From: Andrew Uprichard <auprichard at uprichard.net>
 To: triumphs at autox.team.net 
 Sent: Thursday, September 17, 2015 1:41 PM
 Subject: [TR] TR3 coil question
<!--#yiv4895570876 _filtered #yiv4895570876 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv4895570876 #yiv4895570876 p.yiv4895570876MsoNormal, #yiv4895570876 li.yiv4895570876MsoNormal, #yiv4895570876 div.yiv4895570876MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", "sans-serif";}#yiv4895570876 a:link, #yiv4895570876 span.yiv4895570876MsoHyperlink {color:blue;text-decoration:underline;}#yiv4895570876 a:visited, #yiv4895570876 span.yiv4895570876MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv4895570876 span.yiv4895570876EmailStyle17 {font-family:"Calibri", "sans-serif";color:windowtext;}#yiv4895570876 .yiv4895570876MsoChpDefault {font-family:"Calibri", "sans-serif";} _filtered #yiv4895570876 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv4895570876 div.yiv4895570876WordSection1 {}-->I recently finished the restoration of a ’57 small-mouth with a number of upgrades / modifications including oversize pistons, ported head, lightened flywheel, SU HS6 carbs with long intake manifold, and a 1,2,3 distributor.  The car runs great, but I seem to be frying coils, usually after pushing the revs.  The first time it happened, I called 1,2,3 and they reminded me I had to use a coil with more than 1.0 (and ideally more than 1.5) ohms resistance and no external ballast.  I tried a regular Lucas coil and all was well until I took the car to a rolling road yesterday and we ran it up to 5500 rpm.  (By the way, the carburetion was fine  throughout the rev range, so I don’t think this is a fuel issue).  The car performed well on the dyno, but on the way home started to backfire on acceleration, the same symptoms I have had twice before and have been “cured” by replacing the coil.  This time I have ordered a Bosch Blue, 3.5 ohm coil, as recommended by 1,2,3.  If it happens again, I think I will revert to a standard points or Pertronix  set-up and see how the car runs, but I was wondering if anyone had had a similar experience or might have any suggestions.  Andrew Uprichard  P.S.  The one thing we did observe at the rolling road was there was too much advance:  around 10 degrees at idle and 35 degrees (25 added by the !,2,3 distributor) at 4000 rpm. Although the car wasn’t pinging, it did flatten out around 4500 where one might have expected more power.  I can’t see how too much advance could be a culprit, but I am open to any thoughts.  

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