Of course zed being very much like me, once knowing it annoys someone either a. will leave it to annoy or b. did it like that to annoy....
Spoke too soon - some heavy braking later it's back so I fitted the old scored worn drums to see. I was going to do this last time but having cleaned up the hubs thought it fair to give the new drums another go. No wobble after a 40 mile run round with the old worn out drums so swapping of new ones organised with VW Heritage. The new ones I have just don't sit flat against the hub - when you tighten the wheel nuts it doesn't feel quite right with an extra 1/2 a turn tightening against something on a couple of nuts which must be the drum flexing.
Just popped in to see what's wrong with the cht gauge? It's not the first time I've heard problems about new drums I'm glad I'm re using my old ones
I now have a new pair to try but still have the originals to fall back on. CHT - what I know, though I haven't given it any effort yet! Plugged into the gauge with the short 2CV wiring and dunked in hot water they appeared to register about right but I didn't accurately test, was more concerned with my bending breaking them... With the extensions and near as damn it boiling water they show only 50 degs C. The pic on the 2cV site shows Type J thermocouple so I bought Type-J cable to extend. The thermocouples supplied are not labelled with the type, no mention in any paperwork either. So either I bought the wrong type of type J cable, or they aren't type J thermocouples, or the gauge just can't cope with longer cables for some reason which seems unlikely. Driven at 70mph for 20 minutes one gauge showed 75 degs, the other 50 degs. Don't think that's right.
Great minds think alike. Pretty sure red/white, but not so sure about the extension cable though that was at least labelled as Type J (the packet).
have you any connections at all? If you have got any, I think you can joint the bare wires but ideally you'd use properly coded connectors. They are specific to thermocouple types.
From reading up a bit beforehand and by the generic copper cable 3ft extension that came with it to join between thermocouple wires and gauge, I'd guess connectors wouldn't have much effect.
don't thermocouples work on output resistance? if so the longer the lead the greater effect this would have on accuracy...
Probably not at the boiling point of water. We use the N Type Thermocouples and corresponding connectors as we have to work to British Standards and provide calibration records with 0.5% max error values. This has to be maintained up to 1050'C! I have never used bare jointed wires on them. Anyway, I'm sure we have some rolls of compensating cable at work, Ill have a look in the morning
