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?
Charlie Warner
Fatto Gatto Racing
User avatar
fattogatto
Third Gear
Third Gear
 
Posts: 261
Joined: 23 Sep 2015

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.
Phil Harrison
1972 Elan Sprint 0260K
User avatar
pharriso
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 3596
Joined: 15 Sep 2010

PostPost by: fattogatto » Tue Mar 14, 2017 9:02 pm

Thanks Phil. I stand corrected.
Charlie Warner
Fatto Gatto Racing
User avatar
fattogatto
Third Gear
Third Gear
 
Posts: 261
Joined: 23 Sep 2015

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 ?

John :wink:
User avatar
john.p.clegg
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 5744
Joined: 21 Sep 2003

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...
Phil Harrison
1972 Elan Sprint 0260K
User avatar
pharriso
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 3596
Joined: 15 Sep 2010

Total Online:

Users browsing this forum: No registered users and 22 guests