Lotus Elan

Non-return valve for headlights

PostPost by: jimj » Fri May 24, 2019 9:12 am

If there was no non-return valve from the intake manifold to the vacuum pipe for the headlights, would it affect the carburation?
Jim
jimj
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1131
Joined: 25 Feb 2008

PostPost by: Grizzly » Fri May 24, 2019 10:23 am

Not tried it but as the idle jets (Idle and progression) is vacuum based i'd say it would increase the volume of the inlet making accelerating through the progression on that one cylinder much leaner initially, not sure it would effect the cruise though. The one way valve should stay shut most of the time as it should hold the peak vacuum which is achieved when accelerating and snapping the throttle shut (overrun).

I'd guess you would get a similar effect as an air leak, not sure the headlight pods would work that well either as most of the vacuum they need is achieved on the overrun.
Chris
User avatar
Grizzly
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1923
Joined: 13 Jun 2010
Location: Cheshire/UK

PostPost by: 69S4 » Fri May 24, 2019 8:12 pm

On my Stromberg S4 it makes no discernible difference at all whether there's a non return valve in the headlamp line - to the engine anyway. It makes a substantial difference to how the headlamps stay up. Your Weber mileage may vary as they say.
Stuart Holding
Thame UK / Alpe D'Huez France
69 S4 FHC
Honda GoldWing 1800
Honda CBX1000
Kawasaki H1 500
Yamaha XS2
69S4
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1123
Joined: 23 Sep 2004
Location: nr Oxford UK

Total Online:

Users browsing this forum: No registered users and 2 guests