Message text written by "Randall Young"
>I think it depends on exactly which emissions setup it has. On your
friend's TR6, the float bowl vents are connected to the top of the
canister,
which also has air flowing into the carb bodies. If the canister becomes
clogged (or if some of the orifices are missing), it draws a vacuum on the
top of the canister and on the float bowls, which prevents the carbs from
drawing fuel. The anti-run-on system actually does this on purpose, to
help
the engine die when the key is turned off.
<
Actually, upon closer inspection you will see a change-over valve built
into each carburettor that swaps the float bowl vent based on throttle
position. When the throttle is closed (idle) the float bowl is vented to
the charcoal canister, but when the throttle moves off idel the little
valve swaps over to a port on the face of the carb inlet - the same
provision that is used full time on earlier model Z-S carbs. Thus, even if
the charcoal canister is misbehaving it will only effect the idle, not the
driving characteristics. (The above is only true on 73 and later TR6's as
well as TR7's and (probably) later model Spitfires)
Cheers
Dave Massey
57 TR3
71 TR6
80 TR8
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