Darren Groves

Cam supplier said cam shouldn't give a lumpy idle, they have used widely with no problems. Cam timing done using dial gauge, timing wheel and piston stop so I am as confident as I can be it's correct. Clearances were recommended at 10 & 11 thou. Carb breather holes are clear and float height fine. I'm running Megajolt which uses a Ford coil pack, so restitive plugs are actually recommended. I used standard plugs up to a few months ago it ran a little better after the swap. Initially I used standard dizzy, coil and plugs and these issues were there. I'll give the hotter plugs a try.

Hi Andy, I'm using BPR6ES plugs. Not much choice in fuels down where I am, so generally using local garage with standard unleaded. I did use Esso Super Unleaded for a bit but made little difference to be honest. Closest Shell station is over 30 minutes away, so not much chance of using that on a regular basis.

So a year ago I fitted a rebuilt, slightly modded engine into my 13/60. Mods were: · Warmer cam (70/30 30/70) · Larger Valves (36.4mm inlet and 31.3mm exhaust) · Megajolt · Twin HS2 SU's (AAQ Needles & Stronger Springs) · Four Branch Exhaust Manifold · Duplex Timing Chain · Crank, Flywheel, Clutch Cover and Con Rods balanced. So the end result has been a very smooth engine (at revs) with a little extra go than a standard 13/60 Herald, just what I hope for. There have been 2 ongoing niggles though; one is an inability to get a smooth idle, not so worried about that for the minute. The second niggle was that after a couple of months of driving the car would run on a little when switched off, the problem gradually got worse. Now I know why, there was a lot of carbon build up, which I thought was a little odd given I’d only done a 2000 miles or so since a rebuild. I took the head off, cleaned everything up, put it back together and the problem was fixed, no more running on. Using a Gunson Colourtune & Gastester combined I set the mixture and at idle got a steady CO reading of 3.0%, all was well I thought. However after a couple of thousand miles the problem is slowly returning, so I can only assume it’s due to carbon build up again. The car is used 4~5 days a week, some short journeys of around 2 miles, but regular 10~15 mile runs as well so should be getting nicely warmed up. Ideally I need to get it on a rolling road to get the Megajolt & Needles set up properly, rather than the trial and error method I have been using up until now. But before I take the plunge and book a session, are there any suggestions as to why it’s getting choked up so quickly?

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To revive a thread from the old message board, please post a picture or two of your car/cars: Here's a couple of mine on the trip up to Donington: The red one belongs to Trevor Collett (Specials Secretary).