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Originally Posted by dannym
They actually do fade out. This has been discussed before:
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The plugs draw an initial current of about 120 amps well over the 80 amp fuse. The plugs have to fade to prevent melting of the fuse.
Danny |
Be a bit careful with the terminology here.
When the relay closes, the initial inrush of current may be close to 120 amps. The plugs are stone cold at this point. As soon as they begin to heat (well within 1 second), the current flow begins to drop. But, this can hardly be considered "fading" because they have not even achieved maximum temperature.
Within about three seconds (est.), the plugs reach maximum temperature and full resistance and the current draw is approx. 60 amps. to all five of them.
They remain at this maximum temperature and current draw for the next 37 seconds (approx.) with no degradation of temperature during this period (voltage drop in battery during this time frame is excluded). At the end of the period, the relay shuts off instantly and the plugs cool down very quickly. They drop below red hot within three seconds (est.).