MG
The Classic Marque

You could try making a simple pivot table from the data. Just add all your columns in, without totalling etc, and use a filter on the field you are interested in?

OK re the coil.

For distributor vacuum I doubt it would allow enough air in to prevent combustion, try just pulling the tube off the port on the rear carb with the engine running to see what I mean. There will be a difference, but it shouldn't be much. You could also remove that tube and block off the port altogether just to see what happens. It will affect part throttle acceleration t...

Thanks Paul,

I actually had a spare new coil, so had fitted that with the connections the right way round, so I don't think its the coil.

I don't have a servo fitted, but do have vacuum advance on the distributor. Would it be worth disconnecting that and driving around to see if maybe theres some intermittent dodgy connection at the breaker plate?

Is is this kind of neon...

Thanks Daniel, I will do a bit of dismantling and report back on the aux Venturi. At least it will be good to go to tuner with all these settings on paper so they haven’t got to start dismantling to find out.

OK, still there then. As at the outset I can't see it being the ignition LT side i.e. voltage supply, electronic ignition or coil primary or the tach would drop to zero while the engine was still spinning down.

I have my doubts about HT as well as that usually causes backfires from unburnt fuel in the exhaust.

That leaves fuel but I can't see how that would stop and restart as s...

Okay, had a chance to do an extended test run this evening with the coil connected up correctly.

Several circuits of very local roads - so no chance to go above 30mph, but managed a run for about 1hr and 20mins continuously without any issues. However, shortly after that the problem seemed to reappear, though not as bad - it was more a momentary power loss, and the tach did not have a ch...

What size are the Aux Venturi?

On my car I had the calibration perfectly set up (for maximum power) with 3.5 Aux Venturi and 185 main jets.

Then on advice from a very knowledgeable expert I switched to 5.0 Aux Venturi but 160 main jets but didn't notice any difference whatsoever and the calibration was still perfect.

So, what I am saying is that there is a specific relat...

Thanks for all the comments, I had looked at Vizards chart and Daniel’s book too but perhaps I need to read the book specifically to understand Webers as I’m not quite sure what all these parts parts do , how they interact and what you would replace to change performance. As Dave says the car is a fast road sprint, hill climb car and I understood that smaller chokes can improve torque and driv...

Hi, any advice on removal of this non standard front shock on my YA. A standard armstrong lever arm has been converted to a modern shock but the weld has given way. Do I need to remove the inner wing / wing to get the lever arm off the studs or is there a better way to remove it fyi its the passanger side but I will also look at the drivers as not sure why it failed!

If you're going to dyno it I'd leave it alone and see what it does--It'd be a shame to stuff with it then find you need to go back to where it was. To me the mains are only just there but that depends a lot on the exhaust as well. If you're running a silencer then maybe they're pretty close but if it's a racer with a large/short exhaust the mains will need to be larger .
The dyno man will be ...