12-09-2020, 02:26 PM
Hi Duncan,
I had a very similar problem with my special, not reaching the higher rev band just shy of 3k absolute max. really struggling to get 40mph.
Some time ago I had an issue with the car not idling properly, I re set the ignition timing (electronic) and the SU carb, and it idled fine. After changing the rear axle for a late Ruby axle and having run the engine in for a period I found the car really quite sluggish and not achieving the higher revs, as above.
My initial thought was carbonation, tried various needles, settings etc. to no avail. Changed to the standard Zenith. I ignored the distributor as it was almost new.
However on checking the distributor yesterday I found that a weight anchor pin had broke, but more importantly there was a pin from somewhere holding the weights out (hence the previous poor idling). Therefore whilst the timing was set correctly for idling there was very little or no Advance at higher revs.
I changed the distributor this morning and took the car out for a run. It now revs freely to 4k. I chickened out at 55mph owing to a strong cross wind and a poor road surface.
I hope you resolve your issue soon,
Tod
I had a very similar problem with my special, not reaching the higher rev band just shy of 3k absolute max. really struggling to get 40mph.
Some time ago I had an issue with the car not idling properly, I re set the ignition timing (electronic) and the SU carb, and it idled fine. After changing the rear axle for a late Ruby axle and having run the engine in for a period I found the car really quite sluggish and not achieving the higher revs, as above.
My initial thought was carbonation, tried various needles, settings etc. to no avail. Changed to the standard Zenith. I ignored the distributor as it was almost new.
However on checking the distributor yesterday I found that a weight anchor pin had broke, but more importantly there was a pin from somewhere holding the weights out (hence the previous poor idling). Therefore whilst the timing was set correctly for idling there was very little or no Advance at higher revs.
I changed the distributor this morning and took the car out for a run. It now revs freely to 4k. I chickened out at 55mph owing to a strong cross wind and a poor road surface.
I hope you resolve your issue soon,
Tod