[Diy_efi] Distributor cap Q

[Mike Poulson]

I think the deposits you describe are called fret. I have seen many caps and
rotors with those same deposits stuck to the electrodes. I think it is
caused by oxidation of the metals under high heat conditions. As far as I
know, this condition is normal wear. I usually chissel it off with a screw
driver blade.


Mike aka Terrible Ted

----- Original Message -----
From: "Bob Tom" <tigers at bserv.com>
To: <diy_efi at diy-efi.org>
Sent: Saturday, December 07, 2002 11:01 AM
Subject: [Diy_efi] Distributor cap Q


> Hi
>
> This may not be an appropriate for this list but, with the knowledge
> base, I'd thought that I would try after coming up pretty well
> empty-handed looking for an answer.
>
> I had been experiencing bucking/hesitation/misfiring on the track
> whenever the engine was above the 5500 rpm range.  I discovered
> that the contacts inside the cap and on the rotor were coated
> with hard, thick chalky deposits.  This is the first time that I've
> seen a condition like this (been involved with autos. in one way
> or another since the mid-50s).  I've seen burnt and pitted contacts
> and contacts with mildew on them but nothing like this.
>
> The contacts are brass.  My ignition is stock with the exception
> of using copper Autolites one range colder than recommended
> and about .003" less than recommended gap.
>
> Does anyone have an idea what this deposit is and what would
> cause it?  Thanks in advance.
>
> Bob Tom                 Ontario, Canada
> 97 Dakota CC Sport, 5.2L, 4x2, 44RE, 3.92SG, 4,080 lb (truck, driver, 3/8
tank)
> Dyno:  SAE corrected RW:    HP:  243.1 @ 5500      TQ:  259.5 @ 4250
>             Calculated Flywheel:  HP:  313.7 @ 5500       TQ:  334.8 @
4250
> Track PB:   ET   14.313       Trap speed   95.92
>
>
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>


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