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[addy]

I have done a search but cannot find the answer.  The thin vac pipe that goes from the cam cover, to the throttle body on the wifes 1995 2.0ltr 16v has gone all soft inside. I am trying to find the Inside diameter, so I can buy some reinforced silicon vacuum pipe to replace it.

Would anyone have an idea of what size inside diameter it should be please, also is it worth doing the other vac pipe next to it, on the cam cover with a silicon vac pipe?

Thank you in advance for any help.
Addy

[Nick W]

I can't help with the size, but you should know that silicone hose isn't recommended for oil applications.


Why not measure the fittings the hose attaches to?

[addy]

Thanks Nick W for the quick reply.  I thought of silicon vac pipe, as cannot seem to find proper pipe. Will do as you say and see if can get a pipe that will work using outlet measurement on camcover.

Addy

[deviator]

If it's the normal thin vacuum pipes, the ones Vauxhall use thin hard plastic pipe with the rubber ends that fail. Then I think the internal diameter is 4mm. If I'm wrong, it's 3mm, but I seem to remember 4.

Oh, a quick Google says, 3mm, 3.5mm and 4mm ID. You can go .5 down in size, but obviously not up.

https://www.vauxhallownersnetwork.co.uk/threads/2-0-dti-vacuum-pipe-size-question.384234/