[Healeys] backfiring

[Alan Seigrist]

Installing Pertronix usually requires a significant adjustment of the
distributor to adjust for different timing setting on the cam-magnet
sleeve.  If you didn't retime the car, you would have gotten poor
running.

Have had Pertonix on all four of my LBCs with FAR less trouble over
the last 15 years then dealing with contacts on just one car in the
80's when I still used them.

No thanks!!

Alan

On 3/14/11, S and T Miller <stmiller96 at hotmail.com> wrote:
> Gary, had a similar problem with a fellow AHSTC members car.  Backfired
> LOUD!
> Drove three hours each way to help him out.  Went through everything and it
> only made it somewhat better.  He previously had Pertonix ignition installed
> and when we swapped out the dist with and conventional points one, the
> problem
> went away.
>
> Message: 9
> Date: Sun, 13 Mar 2011 10:18:38 -0400
> From: warthodson at aol.com
> Subject: [Healeys] backfiring
> To: healeys at autox.team.net
> Message-ID: <8CDAFA0AE46DB73-1938-34C25 at Webmail-d116.sysops.aol.com>
> Content-Type: text/plain; charset="us-ascii"
>
> We have been trying to find the source of backfiring & eliminate it on a
> friend's BN7 (twin carb). Every time he shifts it back fires one time, very
> loud. It sounds like a rifle shot. I am not talking about the normal
> rumbling
> during deceleration. The car has recently been fully restored. The engine,
> distributor & carbs were professionally rebuilt. We have double checked the
> timing & carb adjustments. We cannot find any exhaust system leaks. If there
> are any they are very small. The tail pipes exit in front of the left rear
> wheel. The muffler has some damage, it was partially crushed when trying to
> unload the car from a trailer when it got hung up on the trailer bed to ramp
> angle. However, I could not see, feel or hear any exhaust leak in the
> muffler
> or pipes. I have read previous posts on this subject & they always seem to
> say
> that the cause is running lean or rich or exhaust leaks. I don't think we
> have
> any of these issues. Can you suggest any tests we could do to isolate the
> cause of the backfiring? Has anyone experienced this type of backfiring &
> eliminated it? How?
> Gary Hodson
>
>
> The Millers
> "British Car Nuts"
>
> 1957 Austin Healey 100-6 BN4 35299
>
> 1959 Austin Healey 100-6 BN4 77219
>
> 1964 MGB 40841
>
> 1960 Austin Healey Bugeye Sprite AN5 34351
>
> "Always drive them, but remember each drive in an antique car is a test
> drive."
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