Lotus Elan

Headlamp Vacuum Pipe

PostPost by: silverlink » Mon Jun 23, 2014 9:42 pm

I am putting the finishing touches to my Sprint and am looking to replace the old rubber vacuum pipe that runs from non-return valve on inlet to t-piece on cross member. I am thinking of using silicone as apposed to rubber and would like to know what size pipe I need. Inside diameter & outside diameter would be most helpful.
thanks
Ian
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PostPost by: billwill » Mon Jun 23, 2014 10:52 pm

Tricky.

You need a pipe that won't 'suck flat' but I don't think you will usually find that in the specifications.


The wall thickness for negative pressure (vacuum) will need to be much thicker than for the corresponding positive pressure.
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PostPost by: rgh0 » Mon Jun 23, 2014 11:14 pm

The pipe was orginally black nylon tube the same as ran to the head light pods and to the dashboard switch. This used a short length of rubber fuel pipe hose which was resitsant to the fuel to join at the tee and vacuum tapping.

cheers
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PostPost by: peterexpart » Tue Jun 24, 2014 10:01 am

Ian
The Hard Plastic Pipe is 5/16" O.D. or if it is easier to get Metric Version 8mm O.D. if you are going for Silicone Connecting Hose I would use 8 ID x 12 OD that will give you a wall thickness that will not collapse in vacuum, and use "Mikalor" 12-14mm Spring Clips to hold it on.
At least that is what I did on mine
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PostPost by: silverlink » Tue Jun 24, 2014 8:15 pm

Many thanks for all your replies guys, I knew someone would have an answer
Ian
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PostPost by: pharriso » Tue Jun 24, 2014 10:31 pm

Give Sue Miller a call, she has it in stock.
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