Guys,
The episodes of bucking/coughing/spitting with my newly restored TR6 are
over. For the archives, here's what I did which ultimately solved my problem:
1) This was the toughest call but proved to be the primary solution.....I
replaced all three 175CD carbs (these were the carbs from mid 60's TR4A's) with
175 CDSE TR6 carbs. Of course this meant cleaning/assembling/rebuilding 3
CDSE's from two buckets of spare carbs and 2 donor TR6 carbs off of a parts car
then altering the fuel line plumbing and the TR4 linkage to work TR6 carbs
and.....arragh...it was agony!
2) Replaced my points with a Pertronics unit. I can't say that leaving the
points in would have a real negative affect on performance but I somehow feel
more comfortable with the Pertronics (of course the entire points package is in
the boot just in case).
3) Replaced the electrical fuel pump with a stock TR6 mechanical pump.
Wouldn't you know that, after I did this, we eventually proved that the fuel
pressure gauge I was using was defective so maybe the electric pump would have
worked out - who knows!?
The cam's power band comes in at 2000 rpm so if I try to lug the engine down
around 1500, it gets a little cranky and wants to see an downshift.....okay
with me because when the throttle opens above 2000, the motor gets busy in a
hurry.
So, thanks again to all who chimed in last month with suggestions on my
multitude of symptoms. I've learned a lot about this car.....I wish I had a
solid
reason why those TR4A carbs didn't work but I don't. All I can offer is that
they just weren't compatible with the air/fuel needs of my particular engine.
Cheers,
Chip Krout
Skippack, PA USA
1976 TR6 #CF57822U - one of the last 500 built!
1970 Spitfire Mk3 #FDU78512L - sadly, sold on June 14th but to a good home!
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