Hi Everyone,
I'm currently in the process of switching my '70 Mk3
from the single Stromberg to the twin SUs. Here's what
I've done so far:
- Bought a used Mk3 dual SU manifold
- Bought two used SU carbs from a '69 Mk3
- Bought a rebuild kit from Burlen Fuel Systems in the
UK (including throttle shafts and throttle butterfly
discs)
- Rebuilt the carbs with above kit
- Ordered K&N filters
- Ordered an EC valve & hose, mounting bolts, new
intake/exhaust manifold gasket from SpitBits
So I think I've got a good foundation and the next
steps I am guessing are the following:
- Connect my existing (non-cable) throttle linkage and
cable choke linkage to the new carbs once they are
installed
- Route new fuel hoses between the fuel pump and carbs
and between the front and rear carb.
- Tune and synchronize the rebuilt carbs.
Questions I have...
- Can I adapt my existing throttle linkage, or do I
need to find a used linkage from a '67-'69 Mk3?
- The needles and piston in the suction chamber rise
and fall smoothly into the new jets, but don't settle
all the way down -- there's still approx. a 1/4" to
1/2" gap between the bottom of the piston and the
bottom of the carb throttle body. Is this correct, or
are the jets or something else out of alignment?
- The only two external linkages that came with the
carbs I bought was A) a connection between the front
carb and rear carb's throttle linkages and B) a
mystery linkage which looks to connect the linkages
that push the jets up or down. Is there anything else
I need?
- Do people generally recommend the Unisyn tool. or is
the mechanic's stethoscope method of tuning reliable?
Once the carbs are synched, should I pull out my
ColorTune and adjust the mixture further or just not
mess with it?
Thanks!
Adam
'70 Spitfire Mk3
PS -- Just received Joe Curry's '70 Mk3 front badge
restoration kit today and it looks great! Thanks Joe!
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