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
Posts: 1
Joined: 20 Apr 2024
Location: Canada

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.
Fourth Gear
Fourth Gear
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