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10-24-2012, 10:29 PM
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CC Member
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Join Date: May 2012
Location: Poway,
CA
Cobra Make, Engine: Shelby American, 1965 427 FE, alloy MR heads, Sidewinder intake
Posts: 112
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Not Ranked
Smiths Tachometer
My tachometer bounces around when I drive over bumps or when I corner hard. It bobs up and down by as much as 1000 RPM on the dial. Is this normal? It's always done it and I wonder if I should repair/replace it or consider it part of the "character" of the car. If it can be repaired, who can do it?
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10-25-2012, 05:24 AM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
I use Nisonger but typically find replacement cost is comparable to repair costs.
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10-25-2012, 10:44 AM
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CC Member
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Join Date: Jan 2011
Cobra Make, Engine: Hi-Tech
Posts: 734
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Not Ranked
I wouldn't say that mine bounces but it definitely "bobs", especially after a big decrease in RPM's - it takes a few seconds to stabilize.
I will be driving my Cobra to work tomorrow and I will make a point to watch the tach when I hit a bump.
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10-26-2012, 09:25 AM
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CC Member
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Join Date: Jan 2008
Location: Celebration,
FL
Cobra Make, Engine: Superformance #2144 with a Roush 342R (sold June 2018, but still lurking on Club Cobra)
Posts: 128
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Not Ranked
I highly recommend NISONGER. I've used them several times in the past and have had excellent results. Give them a call. They're great to deal with and will do you right.
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10-26-2012, 10:50 AM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,601
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Not Ranked
What has nisonger got to do with a smiths bouncing needle?
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10-26-2012, 02:25 PM
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CC Member
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Join Date: Nov 1999
Location: Sunnyvale,
CA
Cobra Make, Engine: Early Contemporary 427SC w/ '66 427s.o. (car built in '79) by Snow White Rods (Fresno, CA); XKE Series II front/rear suspension (AMP lower A-arms/half shafts), CWI rebuilt IRS, 4-spd Toploader, PS Engineering knock-off rims.
Posts: 102
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Not Ranked
Quote:
Originally Posted by CHANMADD
What has nisonger got to do with a smiths bouncing needle?
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They sell and repair SMITH Instruments - I recently purchased a new Amp gauge from Pete Bayer (Contemporary Cobras), who has been there for a number of years.
__________________
George 
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10-26-2012, 02:35 PM
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CC Member
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Join Date: Mar 2002
Location: Mooresville,
NC
Cobra Make, Engine: Factory Five chassis/Mr. Bruce slabside
Posts: 601
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Not Ranked
Quote:
Originally Posted by CHANMADD
What has nisonger got to do with a smiths bouncing needle?
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They are the go to guys for everything Smiths, sales or repair.
John O
__________________
jjo42
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10-26-2012, 03:20 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
and an advertiser here on CC.
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10-26-2012, 05:02 PM
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CC Member
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Join Date: May 2012
Location: Poway,
CA
Cobra Make, Engine: Shelby American, 1965 427 FE, alloy MR heads, Sidewinder intake
Posts: 112
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Not Ranked
Thanks guys. I'll give them a call on Monday.
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10-26-2012, 06:35 PM
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CC Member
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Join Date: Feb 2006
Location: Farmingdale,
NY
Cobra Make, Engine: Contemporary Classic Motor Car; 427 S/O
Posts: 263
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Not Ranked
did you change to an MSD ignition recently?
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10-27-2012, 12:40 AM
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CC Member
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Join Date: May 2012
Location: Poway,
CA
Cobra Make, Engine: Shelby American, 1965 427 FE, alloy MR heads, Sidewinder intake
Posts: 112
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Not Ranked
Quote:
Originally Posted by streetrod1927
did you change to an MSD ignition recently?
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No. I have a Ford mechanical advace distributor with a Pertronix ignition module. I have been (for years) thinking about changing to an MSD ignition system that would allow me to retard timing at start while setting the idle with plenty of advance. It's one of those things that I keep putting off due to other distractions. |
10-29-2012, 08:10 AM
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CC Member
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Join Date: Feb 2008
Location: Rochester,
NY
Cobra Make, Engine: Superformance
Posts: 194
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Not Ranked
Quote:
Originally Posted by jolsen42
They are the go to guys for everything Smiths, sales or repair.
John O
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Gaugeguys at Gaugeguys.com are also very good with giving advice related to Smiths gauges and MSD ignitions. Think their prices are cheaper than Nisonger also. |
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