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Re: [Land-speed] Inertia Activated Fuel Cut Off Swiches

To: <drmayf@mayfco.com>, "'LSR'" <land-speed@autox.team.net>
Subject: Re: [Land-speed] Inertia Activated Fuel Cut Off Swiches
From: <neil@dbelltech.com>
Date: Mon, 8 Jun 2009 09:06:56 -0700
Mayf;

I bought a Ford impact switch and tried to trigger it; a good whack with a
rubber mallet does it but not waving it around in my hand-- that sounds too
low a G force.

Regards, Neil   Tucson, AZ
-----Original Message-----
From: land-speed-bounces@autox.team.net
[mailto:land-speed-bounces@autox.team.net] On Behalf Of drmayf
Sent: Sunday, June 07, 2009 4:55 PM
To: LSR
Subject: [Land-speed] Inertia Activated Fuel Cut Off Swiches

Always the one to try and be safe, I see in the 2009 rule book that 
inertial switches for fuel cut off are going to be required for 2010. So 
I purchased one from Pegasus racing thinking that they sell stuff used 
by the formula ford cars and SCCA cars as well. Well it came yesterday. 
Kinda spendy for such a small part. However, I am surprised at just how 
easy it is to trigger. If I have it in my hand and just briskly wave 
that hand around, it will trigger.  AN dof course, it triggers when I 
hold it with one hand and bump with the other.  I am really thinking 
that this particular unit may trigger in just a simple spin or near 
spin.  Of course I guess I could mount it right on the CG and just a 
rotation of the unit woudl occur. The insructions for sure say not to 
mount it on a panel which can vibrate as that will trigger it.  

My questions are manifold. Are there going to be, if anyone knows, any 
kind of spec for these items? I would think that someting akin to an SFI 
spec is needed here. If a simple piece of foam requires it, then 
someting that might prevent a large fire should also need a spec as 
well. We have approved fire extinguishers why wouldn't this also need 
some kind of at least generic approval. 

Next question, for you folk that have these already installed. How much 
of a wiggle or impact did it or does it take to trigger yours? It may 
simply be that it is working fine and that I can move it fast and hard 
enough to trigger.

I have sent the company an email asking what kind of g levels or just 
motion  it would take to trigger it under normal or not normal 
circumstances. When I get the answer, I'll post it.

Yes, I know that I could have gone to the junk yard and bought one. So 
exclude any comments about that please. As the same questions 
apply...what are the trigger levels....


comments?

mayf
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