Back in the early 70s, we had a Mk2 Cortina GT for our everyday car.
Around town it ran fine, but on certain trips, it would slow and loose
power, even at times dying completely, only to start back up a few
minutes later and be fine. I was sure it was a fuel delivery problem. It
still had a mechanical fuel pump and I had tried opening the tank cap in
case there were a blocked vent issue. It all became a moot point when
another driver made a left hand turn in front of us and it instantly
became a recycling problem.
So check your fuel pump and vent lines.
That also sounds like an awful lot of ignition advance. I run 30-32 on
aa much higher revving motor. I can't comment on the reversed coil,
since I'd my friends would never let hear the end of it if I hooked one
up backwards.
Roger
-----Original Message-----
From: vintage-race-bounces@autox.team.net
[mailto:vintage-race-bounces@autox.team.net] On Behalf Of Rich & Liz
Stadther
Sent: Tuesday, May 22, 2007 9:29 PM
To: vintage-race@autox.team.net
Subject: [Vintage-race] Power Loss
Listers,
This past weekend I ran the SVRA event at Road America in a Dulon
Formula Ford. The car was completely refreshed with new wiring, engine,
coil, etc. It started out great, going very well, running within 3 to 5
seconds of my fastest time at RA. In later sessions, it had a hard time
getting to 7000 RPM. The engine builder happened to be at the race, and
he was quite concerned, so he went over valves and just about anything
that may cause the problem. The next session, the car started out quick
and slowed down. Further checks found the timing was off a bit, and it
was reset to 38-40 degrees total advance.
In the race on Sunday, although I had qualified dead last, the car
easily passed a few of the cars in front of me, but on the second lap it
started to slow. After 3 or 4 of the 4-mile laps at RA, I could see no
one in front of me and no one behind, so I quit.
The engine builder of course was quite concerned and again reviewed the
engine he had built. Timing was good, valves were fine, the plugs
looked great, the exhaust pipe had a nice color, and during the race the
engine sounded great. But it did go slow. Sometime after the race, the
engine builder noticed that I had hooked up the coil backwards. He said
he'd never heard of that causing this kind of a problem, but I am
wondering if it caused the coil to heat up and the engine to lose
performance.
Has anyone on the list experienced a dumb mistake like this, and can
that be the cause of my diminishing performance lap after lap? Over the
winter, everything was refreshed on the car. It had a new Lucas coil,
which is now become a Bosch Blue. The distributor is a late-model Lucas
from a Formula Ford builder.
Does anyone have any ideas what may have caused my slowly decreasing
power?
Rich Stadther
1970 Dulon LD9
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