[Mgs] Bad Fuel Question

Simon Matthews simon.d.matthews at gmail.com
Tue Jul 23 14:39:19 MDT 2019


Quick correction, I should have written zero capacitance, not infinite.



On Tue, Jul 23, 2019, 1:18 PM David F. Darby via Mgs <mgs at autox.team.net>
wrote:

> Thanks, Simon. That’s good to know.
>
>
>
> DFD
>
>
>
> *From:* Mgs [mailto:mgs-bounces at autox.team.net] *On Behalf Of *Simon
> Matthews via Mgs
> *Sent:* Tuesday, July 23, 2019 1:39 PM
> *To:* Max Heim
> *Cc:* MGS
> *Subject:* Re: [Mgs] Bad Fuel Question
>
>
>
> Condencers can fail in two ways, open and closed. If they fail closed
> (shorted), you are not going anywhere, but if they fail open (infinite
> capacitance), much of the energy in the spark can be lost through arcing
> across the points, leading to rough running.
>
>
>
> Simon
>
>
>
> On Tue, Jul 23, 2019, 9:03 AM Max Heim via Mgs <mgs at autox.team.net> wrote:
>
> I understand how it could make the car inoperable. I don’t see an
> explanation for an intermediate state.
>
>
>
> --
>
> Max Heim
>
> mvheim at sonic.net
>
>
>
>
>
>
>
> On Jul 23, 2019, at 6:53 AM, Charley Robinson <Charley38 at twc.com> wrote:
>
>
>
> Not true, Max.  When the points open, the condenser discharges through the
> coil in order to perpetuate the spark.  Without the condenser the engine
> may not even start.  Try it some time. :-)
>
> CR
>
> On 7/22/2019 1:18 PM, Max Heim via Mgs wrote:
>
> How do bad condensers cause rough running? All they do is prevent the
> points from burning. Oh, you are saying the points are burnt.
>
>
>
> --
>
> Max Heim
>
> '66 MGB
>
>
>
>
>
>
>
> On Jul 22, 2019, at 11:10 AM, i erbs via Mgs <mgs at autox.team.net> wrote:
>
>
>
> could also be a bad a condenser. Could coincidental, not causational. How
> old is the condenser? Even if newish, there are lots of crappy new Lucas
> parts out there. I had three bad ones with similar results, until replaced
> with  a Distributor Doctor HD condenser.
>
> Ira Erbs
>
> Portland,OR
>
>       _______                                  _______
>      (______ \____1959 BN4____/ _______)
>          (_________________________)
>
>           BT7 engine and disk brakes
>
>
>
>
>
> 1967 MGB  [image: Description: Image removed by sender. MG]
>
>
>
> A racing car is an animal with a thousand adjustments. Mario Andretti
>
> Please excuse random auto corrects and misspelled words
>
>
>
>
>
> On Mon, Jul 22, 2019 at 10:36 AM David Breneman via Mgs <
> mgs at autox.team.net> wrote:
>
> I've never encountered a "bad fuel" problem before, so I'm looking
>
> for some confirmation (or not).  The local Mom-without-Pop store put
>
> in new pumps, and one of the things they're offering now is 92 octane (US)
>
> alcohol-free gas.  I had about a quarter tank in my MGA (w/MGB high
>
> compression engine) so I went to fill up.  The pump with the alcohol-
>
> free gas was out of order!  So I put in three gallons of regular 92
>
> octane, and about 1/4 mile from the station started experiencing a lot
>
> of misfiring, mostly when accelerating in 3rd and 4th.  I continued
>
> driving like this for about 20 miles to see if it would clear up and it
>
> never did.  I can't imagine it's anything but the fuel, but I've never
>
> encountered "bad fuel" situation like this in 44 years of driving.
>
>
>
> The fact that it started about 1/4 mile after leaving the station seems
>
> like pretty good evidence.  Any other possibilities?  Is there any option
>
> other than to just burn through this half tank of gas?
>
>
>
> Thanks!
>
>
>
> David Breneman  david_breneman at yahoo.com
>
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