Vac requirement for headlights

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Dec 15, 2015 | 09:35 PM

AW IR C3

Thread Starter

Instructor

Joined: Jul 2007

Posts: 115

Likes: 12

From: Philly Area NJ

Vac requirement for headlights

Any idea what kind of vac you need to be pulling to adequately actuate the headlights?

Dec 15, 2015 | 10:15 PM

C3Hawk

Racer

Joined: Jan 2014

Posts: 334

Likes: 6

Since I rehabbed my headlight system, they open and close quickly on 9 inches of manifold pressure.

Dec 15, 2015 | 10:16 PM

fishslayer143

Drifting

Joined: Aug 2009

Posts: 1,346

Likes: 160

From: new iberia la

I have only about 5-6 in hg vacuum because of my big cam . My lights would open, a little slow , one at a time. So, I tied them in with my Electric Vac Pump that operates my brake booster, which provides a constant 18 inches hg.. pop right up.. 10-12 inches hg is usually enough for brakes and headlamps

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