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So I'm working on getting the new MGB dialed in. It has a Pertronix installed inside the standard 25D distributor, and according to the records that came with the car it has 1 size richer needles (jets? can't ever keep these things straight).
When I first checked the timing (vacuum disconnected and plugged) it was set at about 30btdc at idle, and the car was running a set of Bosch WR8DC+ plugs.
I've replaced the plugs with the stock sized NGK (BP6ES 7333) and set the timing to 15btdc at idle (950 rpm or so). Piston lift on the carbs gives me just a slight raise in RPM. At one point I also tried setting it at 32btdc at 3500 rpm, which gave about 21btdc at idle. Not sure which is proper...
I'm no expert at plug reading, or any of this for that matter, but going by the pictures I can find the plugs look maybe a bit hot? Ceramic insulator is white and the strap on the top is grey.
Thoughts? I've no idea what is inside this engine, so I'm treating it as if it's in stock configuration. Car now seems a bit sluggish on the top end, and hesitates(?) sightly in the upper RPM ranges.
(the bit of dark coloring on the ceramic is left from cleaning the threads with a small brush)
When I first checked the timing (vacuum disconnected and plugged) it was set at about 30btdc at idle, and the car was running a set of Bosch WR8DC+ plugs.
I've replaced the plugs with the stock sized NGK (BP6ES 7333) and set the timing to 15btdc at idle (950 rpm or so). Piston lift on the carbs gives me just a slight raise in RPM. At one point I also tried setting it at 32btdc at 3500 rpm, which gave about 21btdc at idle. Not sure which is proper...
I'm no expert at plug reading, or any of this for that matter, but going by the pictures I can find the plugs look maybe a bit hot? Ceramic insulator is white and the strap on the top is grey.
Thoughts? I've no idea what is inside this engine, so I'm treating it as if it's in stock configuration. Car now seems a bit sluggish on the top end, and hesitates(?) sightly in the upper RPM ranges.
(the bit of dark coloring on the ceramic is left from cleaning the threads with a small brush)