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Re: [Land-speed] Inertia Switch Specs...

To: "'James Tone'" <gmc6power@earthlink.net>, "'Rick Byrnes'"
Subject: Re: [Land-speed] Inertia Switch Specs...
From: <neil@dbelltech.com>
Date: Thu, 4 Dec 2008 16:43:31 -0700
Jim;

Be really careful with placing loads on switches unless you know for
absolutely certain that they are rated for the load current. If the contacts
are overloaded it is not uncommon for the contacts to weld themselves
together-- then the switch won't open when it should!

Regards, Neil   Tucson, AZ

-----Original Message-----
From: land-speed-bounces@autox.team.net
[mailto:land-speed-bounces@autox.team.net] On Behalf Of James Tone
Sent: Thursday, December 04, 2008 2:32 PM
To: Rick Byrnes; drmayf@mayfco.com; LSR
Subject: Re: [Land-speed] Inertia Switch Specs...

There is a discussion about this on the Landracing website. It's obvious
that at least 2 folks have been using these switches and the rest of us have
1+ years to figure out what to do. 

Holley blues and Mallory 110's do not draw high amperage and only ask for a
7-8 amp fuse. This style of pump could probably be used without a relay. Dan
stated on landracing "proof of excecution" and that may be a problem as I
don't know of a practical test; maybe Rick does. To me you could mount it on
the frame next to the pump and it would do what it needs to do in some kind
of an impact. I can't see it activating in a spin but on an enddo it would
do it's job. I'm going to "wait and see" before anything but am definately
leaning towards the FOMOCO.

>Subject: Re: [Land-speed] Inertia Switch Specs...
>
>First
>The impact to knock out the "inertia" switch is considerably higher than
the 
>bumping of a push truck.
>How many push trucks have triggered this switch?
>Have anyone with anything manufactured in the past 16 or so years 
>experienced this other than in an accident?
>Quit worrying.  Mount it like the OEM did, and make sure it is accessible
to 
>you.
>Hell, mine in the liner is under the seat, and the seat shell has to come 
>out to reset it.  Thats how much confidence I have that it is not 
>accidentally going to be tripped.
>SCTA is not going to tell us what to use but will look in inspection for
the 
>presence and proper wiring.  It will be hard to prove that it works without

>removal or banging into the race car Really hard.
>The Ford switch has been in production since the late 70's basically 
>unchanged, and has very proven reliability.
>
.  My 
>Weldon pump draws almost 20 Amps at working pressure and flow. (Methanol- 
>100psig)
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