[Land-speed] Inertia Switch Specs...

Skip Higginbotham saltrat at pahrump.com
Thu Dec 4 11:02:12 MST 2008


David,

I have one in my liner that activates a relay that shuts down the 
ignition circuit. I have a mechanical fuel pump. This Ford switch has 
only been activated once....on purpose.....to see if it worked. I 
installed the switch in 2000 after a low speed rollover that some of 
you may remember.

Skip




At 09:07 AM 12/4/2008, Adin, David wrote:
>Mayf,
>It would seem the intent is to shut off the fuel in the event of an
>"upset" and one would hope your push truck is gentler than such an
>event.
>
>However, this is a VERY good question as the ford switch (afaik) will
>trip if the veehickle is hit in the back (ford's intent, anyway) . . . .
>
>It will be interesting to see how this works in reality.  Maybe someone
>is already using this and can chime in?
>
>The ford switch is about $35 new or can be source at a recyler.
>
>David in Durango
>
>-----Original Message-----
>From: land-speed-bounces at autox.team.net
>[mailto:land-speed-bounces at autox.team.net] On Behalf Of drmayf
>Sent: Thursday, December 04, 2008 9:41 AM
>To: LSR
>Subject: [Land-speed] Inertia Switch Specs...
>
>One of th eapproved rule changes, required for the 2010 season is the
>implementation of an inertia switch to shut down an electric fuel pump
>in an upset condition.  I think this is a greeat idea. BUt seems that
>there may be some open issues with that, at least it seems that way to
>me. One is what is the requirement for impact to trigger the switch? It
>needs to be higher that the bump of a push car yet low enough to be
>effective. Can a switch be placed in a control line of a relay or does
>it need to be in the primary line? I can purchase one from Pegasus for
>about 60 bucks that is for 10 - 12 g's and it is used in the circuit
>course racing. But is that too much? Too little?  And that begs the
>question of where and to what the switch should be mounted. Chassis /
>framework? Inside the cockpit area? Does it for some reason need to be
>accessible to the safety crew?  I suspect more questions could be asked
>but this is enough for me now, lol. Have any of you chatted with club
>officials as to what they might actually be looking for during tech
>inspection?
>
>Input is appreciated and no I wont bend over, lol...
>
>mayf


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