Lotus Elan

Vacuum pulled by engine

PostPost by: fattogatto » Tue Mar 14, 2017 8:31 pm

Replacing the vacuum tubes for the lights on a UK version 1967 S3. I have found some nice tygon tubing. It is quite flexible. Does anyone know approximately how much vacuum, the engine will pull at max power? IOW, is hard tubing required?
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PostPost by: pharriso » Tue Mar 14, 2017 8:48 pm

Max vacuum is actually at idle, where you should get 17-21" Mercury. At wide open throttle there is little vacuum.

I've only ever seem the rigid plastic tubing used, Ray (RDEnt) has it at $5 /yard.
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PostPost by: fattogatto » Tue Mar 14, 2017 9:02 pm

Thanks Phil. I stand corrected.
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PostPost by: john.p.clegg » Wed Mar 15, 2017 6:46 am

"Max vacuum is actually at idle,"

Think not , Max Vacuum is actually on the over-run , when the engine revs are higher yet the throttle closed ?

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PostPost by: pharriso » Wed Mar 15, 2017 8:46 am

john.p.clegg wrote:"Max vacuum is actually at idle,"

Think not , Max Vacuum is actually on the over-run , when the engine revs are higher yet the throttle closed ?

John :wink:


You are correct, throttle is closed but engine is rotating faster...
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