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larrytrk
Samba Member
Joined: July 22, 2007
Posts: 377
Location: Central NJ & MA
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 Posted: Sun Feb 03, 2008 12:44 pm Post subject: suppressor shield on the distributor cap |
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My 87 Westy doesn't have the suppressor shield on the distributor cap.
Should this be replaced and if so where can I find one and any hardware associated with it?
No access to junk yards with van parts locally!
_________________
It's all in your mind.
I Hate BAMBI!
87 Westy full camper "Bluie" aka-"busturd"
JUST SOLD HER, WESTYLESS!
Good by cruel world! |
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Dogpilot
Samba Member
Joined: October 03, 2005
Posts: 4205
Location: Flagstaff, AZ
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| Posted: Sun Feb 03, 2008 12:54 pm Post subject: |
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Some had the metal shield and some had plastic with metal shielding molded inside. The plastic one is black. Do you hear a lot of radio noise? If it did, I would be concerned. Otherwise life will go on without it. If your future progeny have three eyes or some other odd genetic twist, maybe....
No, it is mainly for noise. The tiny gap the spark must jump, from the rotor to the pole in the cap is actually a very powerful source of radio emissions. In fact early short wave transmitters exploited this spark gap technology. It is most apparent in the AM band. It will induce a bit of energy in the surrounding wires, as they act as antennas. Potentially, it could confuse the ECU on the O2 sense wire, as part of it is unshielded, and its signal is very low in the first place. It is more of a precaution than a problem.
_________________
Geology with a Syncro rocks!
86 Syncro Westy AKA "The Bughunter"
98 Disco I
08 Range Rover SC
08 VW Rabbit S
1951 O-1G |
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larrytrk
Samba Member
Joined: July 22, 2007
Posts: 377
Location: Central NJ & MA
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| Posted: Sun Feb 03, 2008 1:03 pm Post subject: |
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| Dogpilot wrote: |
Some had the metal shield and some had plastic with metal shielding molded inside. The plastic one is black. Do you hear a lot of radio noise? If it did, I would be concerned. Otherwise life will go on without it. If your future progeny have three eyes or some other odd genetic twist, maybe....
No, it is mainly for noise. The tiny gap the spark must jump, from the rotor to the pole in the cap is actually a very powerful source of radio emissions. In fact early short wave transmitters exploited this spark gap technology. It is most apparent in the AM band. It will induce a bit of energy in the surrounding wires, as they act as antennas. Potentially, it could confuse the ECU on the O2 sense wire, as part of it is unshielded, and its signal is very low in the first place. It is more of a precaution than a problem. |
The only reason I inquired was because of my reading about ECU and O2 Sensor wire inteference, not Radio interference which I do not notice, since, I only use FM and i-pod anyway.
Van runs well except for cold start issue, which I'm working on.
Thanks, anyway!
_________________
It's all in your mind.
I Hate BAMBI!
87 Westy full camper "Bluie" aka-"busturd"
JUST SOLD HER, WESTYLESS!
Good by cruel world! |
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50338
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| Posted: Sun Feb 03, 2008 1:26 pm Post subject: |
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| Pretty low tech part. If you can't find one then you could easily make one. Functionally a piece of a tin can wire tied to the outside of the dizzy and grounded would work as well as the OEM one. |
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larrytrk
Samba Member
Joined: July 22, 2007
Posts: 377
Location: Central NJ & MA
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| Posted: Sun Feb 03, 2008 1:43 pm Post subject: |
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I wondered what the extra ground on my Dizzy was for!!!
_________________
It's all in your mind.
I Hate BAMBI!
87 Westy full camper "Bluie" aka-"busturd"
JUST SOLD HER, WESTYLESS!
Good by cruel world! |
|
| Back to top |
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erdonline
Samba Member
Joined: September 26, 2004
Posts: 943
Location: CT
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| Posted: Sun Feb 03, 2008 10:02 pm Post subject: dist. shield |
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Is there much of a difference in functionality between the plastic ones with metal inside and the all metal ones? Are they interchangeable? Does it depend on the distributor?
Ed |
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Dogpilot
Samba Member
Joined: October 03, 2005
Posts: 4205
Location: Flagstaff, AZ
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| Posted: Sun Feb 03, 2008 11:48 pm Post subject: |
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I actually swapped my metal one for the plastic/metal one on purely cosmetic issues, besides I already had both (the metal one was getting that crusty look). There is no difference in performance or noise (I looked with an oscilloscope). They both fit the same.
_________________
Geology with a Syncro rocks!
86 Syncro Westy AKA "The Bughunter"
98 Disco I
08 Range Rover SC
08 VW Rabbit S
1951 O-1G |
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