BACKFIRE problem
Le Mans Master
Joined: Jun 2002
Posts: 8,339
Likes: 24
From: I can walk to MA
Originally Posted by Burnt71
OK , I'm an Idiot #1 and #3 wires switched. I changed one at a time and I can't figure out how it happened. I was so sure it was right I didn't go back and check it. panic over. Thanks all
However - the above is reality. I have never seen an induced current
(in adjacent wires) cause a firing problem. Now, leaky insulators
jumping across - this is reality. Spark jumping from a distributor
terminal - across a dirty cap - and onto another terminal - Yup, reality.
Induced currents ?? - Good theory, but ...
I'm afraid it's not enough energy coupled to jump the spark gap.
Sorry - but I don't have time now to write up a convincing proof (but I could).
caveat: very little coupling ... at least with carbon core resistor type wires.
Last edited by NHvette; Jun 29, 2005 at 05:10 PM.
Le Mans Master
Joined: Jun 2002
Posts: 8,339
Likes: 24
From: I can walk to MA
Originally Posted by tallgirl
Okay, I'll take some video and see about posting a link to an MPEG.
FWIW, these weren't carbon core in my car -- they were MSD spiral wound wires.
FWIW, these weren't carbon core in my car -- they were MSD spiral wound wires.
Video of what ? a timing light with inductive pickup ?
This doesn't mean the spark is jumping. It means some coupling is
occuring - enough for the sensitive pickup to detect.
Are you getting backfires ?
Le Mans Master
Joined: Jun 2002
Posts: 8,339
Likes: 24
From: I can walk to MA
Originally Posted by rihwoods
Well if it turns out not to be wires.....is it possible there is a crack in the dist cap or some other fault ?
(all I know about electrical stuff is 220 blew 6" off my screw driver once).
Rich:
(all I know about electrical stuff is 220 blew 6" off my screw driver once).
Rich:
It's not the volts - it's the amps that hurt. I'm guessing it was the feed
from the mains (100 amps +) that blew your screw driver apart.
A 15 or 20 amp circuit would only scar a screwdriver before tripping the breaker.
