Ignition (or fuel?) gremlins
Bit of a poser: my car starts first time, runs perfectly well for about 15 mins then starts to misfire and eventually grinds to a halt. Wait half an hour or so and you can repeat the exercise. Would seem to be heat related but I'm not convinced it's fuel (as in hot carbs) related since it happens on some freezing cold days with the bonnet up. My guess is the electrics (coil possibly). Weather (no garage) and work are preventing me from getting at the thing so I'd appreciate any thoughts of where to concentrate when the sun comes back.
Spec: 1972 Midget, Twin HS2 carbs, Aldon Ignitor (hall-effect sensor), alternator conversion, solid-state fuel pump
Re: Ignition (or fuel?) gremlins
Just for general info, I've fixed the problem - the dreaded rotor arm. New ones seem to be complete rubbish (inferior material, poor dimensional tolerancing ...) and break down internally, such that the spark energy dissipates into the distributor shaft in preference to leaping the gap over to the plugs. Irritatingly, they don't just fail completely (so you can diagnose the problem) they recover (seemingly temperature related) and you end up convincing yourself there's fuel blockage/evaporation despite all evidence to the contrary. Eventually, they do pack-up completely, whence systematic checking of the options quickly leads you to the problem.
Anyway, the solution is to seek out improved rotor arms. I've now purchased a nice red one from Moss, which is denoted as their High Quality Spec version, and is, I believe, produced by a chap called the Distributor Doctor. The latter's web page provides some nice info.
HUR167L is now running well!