What years had a Tach Filter installed ??
Thread Starter
Le Mans Master
Joined: Jun 2002
Posts: 8,339
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From: I can walk to MA
What years had a Tach Filter installed ??
No wise remarks from the early guys with a cable.
My '75 doesn't have one installed. Someone did do a bit of Bubba work
on the back of the tach, but I see no sign of the filter under the hood.
Does anyone know the years that these were used or recommended ?
I'm thinking of producing a replacement module or offering "restorative"
services for old (blown) filters.
:seeya
My '75 doesn't have one installed. Someone did do a bit of Bubba work
on the back of the tach, but I see no sign of the filter under the hood.
Does anyone know the years that these were used or recommended ?
I'm thinking of producing a replacement module or offering "restorative"
services for old (blown) filters.
:seeya
Team Owner
Joined: Jul 1999
Posts: 65,492
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From: Orange Park Florida
Re: What years had a Tach Filter installed ?? (Daves_rusty_75)
started with '75, first year of HEI, so no tach cables....much big improvement....
tach filter was placed there to limit the RFI from dist into AM radios....no one cares these days....and of course to smooth out the pulses into the tach....called integrate them, in electronic parlance....
the schematics are well documented here...do a site search...
GENE
tach filter was placed there to limit the RFI from dist into AM radios....no one cares these days....and of course to smooth out the pulses into the tach....called integrate them, in electronic parlance....
the schematics are well documented here...do a site search...
GENE
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Re: What years had a Tach Filter installed ?? (Daves_rusty_75)
All '75-'82 Corvettes had them, and I believe '84 up(to what year?)still used a tach filter. :yesnod:
Team Owner
Joined: Aug 1999
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From: Ontario
Re: What years had a Tach Filter installed ?? (Paul Borowski)
I am going to check through the GM system tomorrow to see if those filters are still available. Parts guys can get lost in upgraded/superseding numbers and lose interest very quickly if you are across the counter. My colleagues are pretty assiduous in cutting to the chase. I went through this is trying to buy my new GM rad when I was a "civilian." Now on the GM side, some eight L-82, non-A/C rads were located. I will check.
[Modified by paul79, 6:45 PM 10/1/2002]
[Modified by paul79, 6:45 PM 10/1/2002]
Thread Starter
Le Mans Master
Joined: Jun 2002
Posts: 8,339
Likes: 24
From: I can walk to MA
Re: What years had a Tach Filter installed ?? (paul79)
Thanks Paul - awesome pic - as usual.
I thought it was mounted to the top of the throttle bracket.
Guess I was wrong.
:seeya
I thought it was mounted to the top of the throttle bracket.
Guess I was wrong.
:seeya
Team Owner
Joined: Aug 1999
Posts: 30,995
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From: Ontario
Re: What years had a Tach Filter installed ?? (paul79)
I checked the GM parts system today. The tach filter is part #14020025 and is "discontinued" and not available. There is no residual stock in parts depots in Canada or the USA. There may be some left in dealers' inventories but I cannot search at that level. That is the bad news. The good news is that the filter was common to all 1975-84 GM vehicles with a HEI distributor and a tachometer. That includes Corvettes, Camaros, Firebirds...even trucks. It is not a "Corvette" part. So there must be 1000s out in salvage yards. I would imagine that you could pick one up for $1.00! Look for the part in my pic above with a brown wire and single-post brown connector at the HEI end.
Another pic.
[Modified by paul79, 4:56 PM 10/2/2002]
Another pic.
[Modified by paul79, 4:56 PM 10/2/2002]
