iiyama
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| posted on 1/6/08 at 10:15 AM |
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Pump inertia switch
As topic, I havent fitted one. Should I? If so where in the circuit would it go?
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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David Jenkins
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| posted on 1/6/08 at 10:21 AM |
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It's a good idea to fit one - not nice to have a crash that leaves you senseless for a while, with the fuel pump whirring merrily away, perhaps
spraying fuel round the engine bay... 
I got one off ebay for around £6, ex-Rover I think.
Easy to wire up - it has 2 wires, and they're normally connected together. Just wire this into the electric pump circuit, so that if the switch
is triggered the power to the pump is cut.
In my installation it was easy to include the car's ignition circuit, so that both the pump and the engine are stopped - but I designed my car
loom, so I knew where to put the switch! 
HTH
David
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iiyama
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| posted on 1/6/08 at 01:46 PM |
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So as I have a bike engine I could wire it in to the engine stop switch? That would kill pretty much everything in the car. well except for me of
course!
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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David Jenkins
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| posted on 1/6/08 at 02:06 PM |
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I'm not sure how the stop switches work - do they disconnect something, or make a connection? If they disconnect then it would be easy to put
an inertia switch in series. Not sure how you fit one in if the kill switch is a 'make' switch.
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matt_claydon
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| posted on 1/6/08 at 02:23 PM |
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On my SV650 the cut-out switch is wired so the contacts must be closed for the engine to run. If yours is the same, which it probably is, then it
would be fine to put the inertia switch in its place.
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iiyama
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| posted on 1/6/08 at 03:36 PM |
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Yup, break the circuit to stop the engine.
Cool. Thanks guys.
One last question though, do these inertia switches have to be mounted in a particular direction? And if so is this marked on the case?
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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David Jenkins
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| posted on 1/6/08 at 04:28 PM |
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This is the one I've got
EBAY LINK
It's got a rubber 'button' at one end, which goes upwards - the connector goes on the bottom. Mine's screwed to the
driver's side of the bulkhead.
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iiyama
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| posted on 1/6/08 at 04:51 PM |
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Thats the one I was looking at.
Cheers peeps!
How do these work then? Hopefully vicious braking and acceleration dosent activate them?!
[Edited on 1/6/08 by iiyama]
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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C10CoryM
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| posted on 2/6/08 at 12:40 AM |
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quote:
Originally posted by iiyama
How do these work then? Hopefully vicious braking and acceleration dosent activate them?!
Braking can if they are sensitive or are mounted at the wrong angle. Typically they are just a ball sitting in a tapered hole. Hard enough hit and
it slides up the taper and trips, opening the electrical circuit.
The idea is to have them on your electric fuel pump so if the lines rupture in a crash it doesnt keep pumping fuel. Shutting the engine off w/o
killing the fuel pump defeats the purpose.
"Our watchword evermore shall be: The Maple Leaf Forever!"
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iiyama
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| posted on 2/6/08 at 06:21 AM |
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Fully understand the reasoning for fitting one bud, which is why I am interested in putting one in the car. Seems like a damn good idea!
However my car is track orientated so maybe its not such a good thing to fit? After SVA I will be fitting an FIA cut off switch but an automatic
switch might buy a few seconds if the unthinkable happens........ If its going to activate everytime I decelerate for Lavant or Woodcote though it
aint gonna be much cop!
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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dhutch
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| posted on 2/9/09 at 01:22 AM |
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Presumably they are resetable?
Looking at geting one of these, which seem to be cheapest of most, all of which appear to look the same.
Daniel
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britishtrident
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| posted on 5/9/09 at 07:38 AM |
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quote:
Originally posted by dhutch
Presumably they are resetable?
Looking at geting one of these, which seem to be cheapest of most, all of which appear to look the same.
Daniel
Just push the rubber button to reset the "Bump Switch" --- on any car you drive you should always know where it is located as they very
occasionally trip out for no obvious reason.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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