> I would quote PS Magazine # 428 (July, 1988) ..."glow plugs for the
>CUCV and HUMMWV are not interchangeable" . It states that glow plugs for
>the CUCV are 12 volt (FSN # 2920-01-151-3627) and glow plugs for the HUMMWV
>are 24 volt (FSN # 2929-01-188-3863)
Thats right. Different electrical attachments. Blade versus spade.
> Now a 11 volt / 75 watt glow plug running on twice the voltage makes
>me wonder just what happens to the wattage output. This is why I deferred
>to someone who knows electricity better than I ....Aussie Rob.
> I asked him ". If a glow plug for a diesel motor (CUCV)
>is rated at 11 volts and produces 75 watts of heat, how many watts of heat
>will it produce at 24 volts?"
>
> To this he replied;
>"...... (snipped quite a bit).........I wouldn't do it, but if you must
>apply 24 volts (POOF)
>The wattage would be as follows....
> (more snipping)..............Therefore, Power of the glow plug at
>24volts would be;
>Power, in watts is P = E x I
>P = 24 x 14.81
>P = 355 watts.
>I hope this helps
>But I would not do it for fear of a big POOF'd glo plug........"
Only true if the plug resistance is constant. They are not. The resistance
increases as these plugs heat up. Thats the way they were designed.
They will take the higher voltage, just not for very long.
The ARMY uses the blade version, AC-13, at about 12 volts,
and the pin version, AC-15 at 24 volts. About 25 seconds for the CUCV
plus afterglow, and about 8 seconds for the HMMV plus afterglow.
During startup, the plugs will see less than 12 V and less than 24 V,
especially if its cold out. More like 10 and 20.
Got this info from Delco, an applications engineer + their 1999 spark plug
book (page 369) HMMV -10 TM operations book, The Diesel Page, website,
and like the rest of you, I work with this stuff.
Hope this is some help.
Oh, the civi plugs like the AC-11 is rated at 6 volt 50 watts.
GM sends 12 volts to the AC-11 as well.
They are recommending the new AC-60 as a replacement for the AC-11.
The AC-60 is rated at 10.5 volts 200 Watts. My guess...., these are a better
built AC-11 type plug.
Ted H.
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