[TR] Triumphs Digest, Vol 3, Issue 441

[Anthony Rhodes]

----- Original Message ----- 
From: "Anthony Rhodes" <spamiam at comcast.net>
To: <triumphs at autox.team.net>
Sent: Saturday, September 19, 2009 4:57 PM
Subject: Re: Triumphs Digest, Vol 3, Issue 441


> Joe,
>
> I have to differ with you.  I have seen 3 of Pertronics fail.  They failed 
> oddly.  They did not die totally, they could not sustain higher RPM, so 
> there would be a misfire at 3K rpm , for example, but it seemed to idle 
> OK.
>
> That being said, I have one in my car, but I installed it when I was 
> trying to eliminate a very small miss.  I found that the MGB push-in style 
> cap and corresponding wires made the most difference.  I had already 
> switched to the pertronics, which had not made much of a difference 
> compared to a well tuned points system.  Since I had already  switched to 
> the pertronics, I was not going to spend the time to switch back to 
> points.  I left it there, but I am prepared to install points at a 
> moment's notice.
>
> This thread got me interested in tracking down a "new" subtle stumble on 
> acceleration from idle on my TR4A.  I thought it might be a problem with 
> excessively lean idle settings on the carbs, so I richened them.  That 
> helped a little, but the stumble was still there.  I then moved to thicker 
> dashpot oil.  I had been using 10-40 (as I recall).  I put in "SU Dashpot 
> Oil" (tm) and that was THINNER than what I had in there already.  I then 
> put in straight 30wt oil, and that was ever so slightly thinner, so I put 
> in 20-50 oil.  That was slightly thicker (as expected).  Unfortunately, 
> the stumble was still there!
>
> I then checked the jet heights and they were very different!  One was 3mm, 
> and the other was just over 2mm below the bridge.  I equalized them and 
> then had to enrich both by 6 flats, and it was running smoooooth!  I could 
> probably go back to a lighter dashpot oil now, but it seems fine with 
> 20-50.
>
> -Tony
> ----- Original Message ----- 
>> Message: 1
>> Date: Sat, 19 Sep 2009 09:07:33 -0700
>> From: "Joe Curry" <spitlist at cox.net>
>> Subject: Re: [TR] TR4A Sputtering - Partially Solved
>> To: "'Ed Woods'" <fogbro1 at comcast.net>, <triumphs at autox.team.net>
>> Message-ID: <4E356DA19BD54E9C92686A16925ADEB8 at joepentiumnew>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> I have never had one fail.  They are solid state devices and much less 
>> prone
>> to failure than points and condenser.
>>
>> JOe