Just as a data point... AAZ glow plugs in the A3 and B3 chassis run for several minutes *after* the car starts...for drivability and emissions.
TDI plugs in the AHU/1Z and ALH engines do the same... even in the summer when they didn't come on initially to start the engine. Catches folks by surprise when they get a glowplug Check Engine Light in the middle of the summer. 
Yup, I was gonna state this as I was reading the post about "Why use an afterglow" but you beat me to it Vince
I have Bosch Duraterms in my 1.6 n/a, with your manual setup Vince, so that on those colder mornings I can afterglow for an extra 20-30 seconds
It really does make a difference, to the tune of smoking when cold to not smoking when cold.. Means proper combustion, which means faster warm-up times.
Veering off topic here, I've always wondered about using the Mercedes GP controller with the purple wire mod. That would be good for about 20 - 30 seconds of afterglow, I think. Utilize some variety of thermal switch on the purple wire and BAM fully automatic GP's with temp dependent afterglow..
If I had to guess, I'd be looking for a fuel line that is hard an brittle when cold, so it sucks air when fuel demand is up, but is fine once the engine bay is nice and toasty.
Just a little information. There are glow plugs that remain on after the engine has started on some diesels. Mercedes calls it afterglow. I think that it might have something to do with emissions. Unfortunately, I haven't found any that fit the VW idi. I made a veg oil heater block using the vw plugs but found out the hard way that they only last a week. I discovered a Bosch 9006 plug from some weird kind of Peugeot that has been working for the last year. It has the 10mm threads but the tip is longer and may not work in the v-dub. Some of the European forums talk about continuous glow plugs for veg-diesels but I have not pursued it. I have a block heater on a timer for about two hours in the morning and am able to plug it in for an hour at the end of work. Fires up OK and I have a heater sooner.
As it turns out, the AAZ 1.9 IDI engine uses about 3 minutes of afterglow... and the generic Bosch Duraterm glowplugs handle it just fine...might work for your application as well.
the glow plugs on my i-mark continue to glow for up to ten minutes depending on engine temp, but at reduced voltage(the glow plugs operate at 6 volts normally, and at 4 volts for afterglow)
-Owen
a 6v system very similar to that of the 80's ford 6.9's. Interesting how they work to get hot with such low voltage.
a 6v system very similar to that of the 80's ford 6.9's. Interesting how they work to get hot with such low voltage.
those systems were a nightmare.. just got done pimping the plugs on a 6.9 not too long ago..
a 6v system very similar to that of the 80's ford 6.9's. Interesting how they work to get hot with such low voltage.
those systems were a nightmare.. just got done pimping the plugs on a 6.9 not too long ago..
Were you pimping 6v plugs for a full 12v? I was gonna do that on my old 6.9 (R.I.P) but i found out its gp's will explode the tip at that voltage..