Vacuum hose

[Jonesey]

anyone know the internal diameter of the vacuum hose between the carb and the petcock????
Cheers!!!
Chris.

[JohnD]

I had to find this out a while back to fit a hose joiner in there to aid balancing of the carbs.

I measured it to be 5mm. However when I put a 5mm hose joiner in there, it fitted, but was a touch on the large side... so would reckon it's probably 4.5mm

Hope this helps / makes sense !

cheers
John

[Jonesey]

Yep John, it's actually 4mm. Cheers buddy.
jonesey.

[JohnD]

Yep John, it's actually 4mm.

..& i'm a spaz for not being able to measure correctly !! Doh !

[tony.mon]

Well, according to my set of "professional quality" hole guages from Lidl
it's 3.958mm dia on a new piece of pipe, but surprisingly, when you then measure the end that's already been fitted onto a fitting for a while it's 4.183!!!

But there's no acceptable wear limit quoted in the Haynes Manual, so I have no idea when they'll need replacing.

AND they're not a check item in the service schedule.

So I'm blaming my next accident on vacuum pipe failure.

Let's see what the insurance people make of that