For 10 months, I have been trying to get the bugs out of the subject engine.
I have
1) Cleaned and sealed the gas tank
2) Installed new fuel pump
3) Rebuilt and tuned SU HS4 carbs
4) Adjusted valves
5) Tightened the exhaust manifold to the exhaust pipes
6) Installed new vacuum advance diaphram unit on the 25D distributor
7) Installed Pertronix ignition
8) Installed new rotor cap, plugs, and wires
9) Adjusted and tried the timing all over the clock (13 degrees
BTDC?)
10) Checked compression at 145-150 across the board
11) Checked resistance of coil (3.5 ohms)
I'm sure there is more, but although I have made modest gains through all
this, I still cannot get this thing to run strong. My symptoms remain:
1) Timing remains at 13 degrees no matter the rpm (vacuum to
distributor diaphragm is drawn from the intake manifold, and is more strong
at idle - diminishes when rpms are increased)
2) Fierce backfire through both carbs
3) Very, very poor acceleration and low power
I have considered the following for my next moves (purchases).
1) New exhaust system (needs it anyway)
2) New (or rebuilt distributor)
Does anybody out there have a clue for me? I vowed to get the B running
correctly before I started dismantling for restoration, but I can't get to
first base. HELP!!!
Rich Townsend
Manassas, VA
69 MGB
75 TR6
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