Lotus Elan

Stromberg vacuum lines

PostPost by: dbnorth » Sun May 19, 2024 10:30 pm

New to Lotus. Bought 71 S4 from BaT a couple months back. Rebuilt Strombergs including bypass valves. Have a vacuum line source at the bottom of the rear Stromberg next to the #3 nut with the Thackery spring washer and nut holding carb on. Will run a line to bypass tubes on rear, then front carb and then forward to my vacuum advance on my stock dizzy with a pertronics ignitor. Does this sound like it will work? No manifold depression valve being used before vacuum advance as I don't have one. I will use an aluminum plate for a gasket on bypass valves if issues but wanted to try to get them to work.
Rob Toronto
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PostPost by: gus » Tue Jun 04, 2024 11:47 am

There should be a vacuum diagram in the service notes.
Most of this is emission controls and really does little in actual running of the car.
Originally my+2 had a little vacuum valve on the rear carb that ran to both throttle bypass valves, and IIRC the distributor. They were intended to only get vacuum at idle.
gus
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