Re: vacuum hose diameter - Saab 9000 Bulletin Board - Saabnet.com
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Re: vacuum hose diameter
Posted by Bill Davies [Email] (more from Bill Davies) on Wed, 15 Sep 2010 02:10:23
In Reply to: vacuum hose diameter, AeroManiac, Tue, 14 Sep 2010 22:00:03
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I think it's 3.5 mm, from memory. But provided the hose doesn't collapse I would have thought the vacuum (or pressure) would be the same throughout the system regardless of diameter - though my physics knowledge is rusty! Velocity implies flow, however, which is a different ball-game. Having said that, it needs to fit OK at the spigot joints - I add cable ties for extra safety.
I used washer hose perfectly successfully to make a "T" connection to a dash-mounted boost gauge, but the connection was behind the radio, not in the engine compartment. I'd suggest that anything you do within the engine area should be in good-quality silicone rubber because of heat issues - cheap hoses can and will become brittle and fail.
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