Malcolm,
When I see/hear backfiring, I always think timing. If you static time
your distro, then set 4 degrees BTDC you should be ok for most driving.
For me on my 3 and 4, I do the same thing but then use the micro
adjustment to fine tune so I don't get any pre ignition and the engine
pulls good in all gears.
If you think your distributor is worn out, then get it rebuilt. I had
mine done on my 6 by Jeff Alexander. He does a good job and the price is
good.
No experience here with electronic ignition. I go with stock on my 3,4
and 6 and are very satisfied.
I have rarely had problems with spark but the few I have had are bad
points, broken connection on the low tension lead inside the distributor
and a bad distributor cap.
Not sure on the rotation degrees on the distributor rotor, but I am
guessing at least 5 degrees each way, (maybe a bit more) and it should
snap back.
Doubt the filters are the problem. But do check the oil level in the
dashpots.
Bob
On 07/16/2012 02:34 AM, Malcolm wrote:
Hello list,
It's been a very long time since I have sent a message to the team.net list
Triumph. Some of you may remember me!
Anyway, I have now got enough time on my hands to tinker again with my 1962
TR4. Also, this year it is fifty years old, so I feel somewhat obligated
to pay attention to it. I've got a bunch of new parts on it now, including
a stainless exhaust and new tacho/speedo cables, and have been trying to
get it to run properly.
I have fairly bad backfiring (through the carbs) under load when
accelerating. I have balanced the carb inlets, the mixture seems OK, and
I've done the static timing. I have new air filters (K&N) on order. I
suspect that this is an ignition problem, though, and the Haynes manual is
dismal when it comes to troubleshooting the distributor. Nearly every test
involves "compare your stuff with new parts, and replace them if they are
worn out".
My big question is: how much should I be able to rotate the distributor
rotor? A little? A lot? 15 degrees? 30? Should it snap back to a
position at rest or just flop around? I am trying to tell if the
centrifugal advance springs need replacement.
Will the K&N filters require me to fiddle with the timing? They are
56-9327: http://www.knfilters.com/search/product.aspx?prod=56-9327
Has anyone got glowing recommendations, or horror stories, for electronic
ignition? I've been scouring the Web and so far have not found a clear
winner. I could rebuild the points (a la Distributor Doctor, or Advanced
Distributors) - or get Petronix, Hot-Spark, or some other drop-in
electronic replacement.
I am not building a concours car. I want it to be reliable, running on
pump gas, with minimal roadside surprises.
Thanks!
-Malcolm
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