[Vwdiesel] Glowplugs --- ( Afterglow -- afterthought's ).

[H .Hagar]

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Nate Wall keep thinking -- please.
Firstly , what was the purpose of plugs in the first place ????   "A starti=
ng AID". Used only during startup. But wait , then it was discovered that l=
eaving the plugs on until engine was up to temperature drastically reduced =
the white fog time.
Then enter the pollution snifters ---- suddenly afterglow was essential to =
get a dieselcar on the road in eropa.
So what was the problem ?  -- the plugs kept burning out. Bosh then designe=
d a new type plug . The one we use now (the one with the brass) It has an i=
nternal resistor in series with the heater element. When the resistor heats=
 up the current is reduced to the heater tip so that it stays below critica=
l temperature for the jacket. Us tinkerers would make our own reduced volta=
ge afterglow using the old plugs.For the rest of you , when your bunny get =
tired    a new set of plugs and an afterglow relay is money well spent.    =
  If Bentley is wrong (I say it is wrong) then the misinformation is propag=
ating along all who quote it as correct.  Charlie Brown's (roger) link  is =
off the hook in the sense that he does say he is repeating Bentley.
Some of you please read the Bentley  --- (mine is VRD4) section 5  page 6  =
  3.1  and let's have your comments.
The power on the plugs vary according to a square law    --i.e.  half volta=
ge quarter power.    more power =3Dmore temp.
The way I read the Bentley is like this. The afterglow creates excessive ex=
haust smoke after a cold start ----I am all ears if someone can explain WHY=
.     Like to know if anyone agrees the text is messed up.
To show how voltage affects  bulbs        100 Volt =3D 100% watts =3D  100 =
% life    if we up the voltage  8 volts  50% life.  Now if we down the volt=
age  by 8 Volts  the life increases to 310 %. So now you know what to do wh=
en you have headlights on all the time.     ----- lower the voltage a wee b=
it.
Hagar.
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