Re: A question about headlights & Bijur system on a '32 901

Posted by Marty or Marston On 2014/11/1 15:33:44

It is one of the vacuum powered automatic Bijur. I would have thought it would be higher. I base this on the fact that the spring that pushed the piston, while it is not very strong, the piston's small diameter would serve as a multiplier, e.g. if the spring exerts 5 lbs of pressure and if the diameter of the piston was 0.1 sq. in. the pressure would be 50 psig.

However, I must disclose the fact that I'm a retired chemist and not one of those mechanical engineer types that could probably calculate the pressure given the spring's force, piston diameter, who knows what else.