Posted by Louis
on 7/14/2009, 9:12 pm, in reply to "Idling/Timing"
74.59.95.183
Thank's a lot for your help guys !
I checked those carbs inside and out and figured that since the needle is fixed, maybe I would be better off leaving that alone. Another thing is that they were serviced by the PO's mechanic about a year ago, so I presume they are OK (needles, diaphragms, gaskets, all look brand new).
One thing that puzzles me though, is that the temperature valve has been glued shut with some sort of silicon 
.
I did balanced the carbs by ear (maybe that Unisyn tool would be a better option) and adjusted the timing using the same scientific procedure 
, wich resulted in +/- 10 deg advance.
Iddle is pretty good at 900 rpm and the car runs great. No pinging under load, no run-on, so I'm happy with that now 
.
Mark: hope you do find another one to keep that love/hate relationship as hot as those AC plugs ! 
--Previous Message--
: Hello !
:
: If anyone could shed some light over
: this, id'be much appreciated:
:
: Haynes book specs indicates 4 ATDC
: degrees for idle timing on GT6 engines
: (USA cars).
:
: UK's specs is 13 BTDC for 100 octane
: gas (!) and 7 BTDC degrees for 97
: octane.
:
: My '68 GT6 was shipped from the factory
: to Canada so I'm guessing it's a USA
: spec car, so idle timing should be 4
: ATDC (the engine is original).
:
: Now my questions:
:
: 1-Is there a different spec for USA
: cars depending on the octane rating
: used ?
:
: 2-I add a bottle of STP booster to
: every fill of 91 gas (best I can find
: around here). Now how does that excatly
: affect the octane level in the thank ?
:
: 3-Tried a Colortune plug and find out
: that the mixture is too rich, wich I
: suspected since all the plugs where
: fooled with black powder. Got that
: special tool to adjust the needle but
: turning it CCW doesn't change a thing.
: Any clues ?
:
: Thanks !
:
:
:
:
:
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