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01-23-2014, 04:04 PM
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Join Date: Mar 2003
Location: Garden City Long Island,
NY
Cobra Make, Engine: SUPERFORMANCE #2258 402 S/R -ROUSH
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Impact switch
Hi Guys, I read on a thread on this site ,when installing a kill switch its a good idea to put a impact switch I also thinks good idea. But did some digging around the web I can't find one . Any leads out there?
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Kenny
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01-23-2014, 04:33 PM
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Join Date: Mar 2007
Location: Creedmoor,
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Cobra Make, Engine: FFR3542K, 347 C. I., EFI, T-5, Miata Front Sway Bar, 3 Link, Red with White Stripes
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If you are running an electric fuel pump you really need an initeria switch. If you can't get one at the auto parts store or Ford, you can get on at a wrecking yard or post in the classifieds on the Cobra forums. Someone may have one sitting around.
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Steve
Texas Cobra Club-Austin
July 2009 FFCars Picture of the Month
FFR3542K, 347, Holley Sniper EFI, T-5, 4 Wheel Discs, 3-Link, Miata Front Sway Bar, Red with White Stripes
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01-23-2014, 05:32 PM
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
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Quote:
Originally Posted by kennyhbh
Hi Guys, I read on a thread on this site ,when installing a kill switch its a good idea to put a impact switch I also thinks good idea. But did some digging around the web I can't find one . Any leads out there?
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It's just a plain old fuel pump inertia switch. Summit has this one, for example: http://www.summitracing.com/parts/sum-890145/overview/
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01-23-2014, 05:49 PM
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Join Date: May 2001
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Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
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you can buy one at the parts store. Ask for an inertia switch for a 1990 Mustang.
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life's goal should be; "to be smarter than inanimate objects"
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01-23-2014, 05:59 PM
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Join Date: Apr 2012
Location: Bay Area (Peninsula),
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Cobra Make, Engine: ERA 427, 427/487 side-oiler
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As I understand it, Ford uses inertia switches. GM uses oil pressure switches. Either will do, though an inertia switch makes more sense to me.
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01-24-2014, 02:25 AM
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I used an oil pressure switch for years with no problem as it was set to shut the fuel pump off when the oil pressure fell below 10 pounds which is quite quick if you have a wreck. But the inertia switches weren't available back when I built my Cobra and had it. I believe I would have used one of them if I could have gotten one.
Ron
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01-24-2014, 05:26 AM
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Join Date: Mar 2007
Location: seekonk,
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Cobra Make, Engine: factory five mkIII roadster 445 fe quick fuel 750 q series,irs
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I have a inertia switch im my ffr it is located in the rear trunk on the far left side, I would think it would only cover you in a rear end collision?
I want to also install a low oil pressure fuel cut off, the last thing you need in a front end collision is to rupture a fuel line and have the electric pump continue to pump fuel?. Would a inertia switch trip if hit in the front?.
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factory five mk III roadster, 445 fe stroker
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01-24-2014, 12:06 PM
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Cobra Make, Engine: ERA 427, 427/487 side-oiler
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An intertia switch should work on any significant impact, front, rear, or side.
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01-24-2014, 01:43 PM
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Join Date: Dec 2010
Location: Allen,
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Cobra Make, Engine: Werk77 289FIA
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Quote:
Originally Posted by lippy
An intertia switch should work on any significant impact, front, rear, or side.
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Absolutely correct.
There are always some on ebay. I installed my in the trunk...
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