Lotus Elan

Brake Servo Cylinder Head Union

PostPost by: silverlink » Tue Jun 19, 2018 8:08 pm

Can anyone tell me the thread size for the Servo union that fits into the No 1 inlet manifold on a Sprint.
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Ian
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PostPost by: alan.barker » Wed Jun 20, 2018 5:58 am

For me it's BSP
Alan
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PostPost by: Bigbaldybloke » Wed Jun 20, 2018 11:15 pm

1/8” BSPT on mine on cylinder 1 but my servo connects to cylinder 4
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PostPost by: alan.barker » Thu Jun 21, 2018 6:11 am

On the baby Elan they both connect to n°1 Cylinder with a "T" fitting
Alan
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PostPost by: silverlink » Thu Jun 21, 2018 7:44 am

Thanks for replies guys,
Alan, as mentioned above in one of the threads my Sprint has two outputs on the head, the front one feeds the servo and the one on no 4 inlet feeds the headlamps. I was in conversation with a fellow member recently and he was telling me that the Plus 2 has this configuration and more than likely my engine could have been destined for a Plus 2 when built as there is more room between the back of the engine and the bulkhead. I ended up putting an 90 deg union on the back thus avoiding the bulkhead and making a better fit for the vacuum hose. The front one is just a straight union but much bigger than the rear one although I would say it has the same thread size.
Ian
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PostPost by: alan.barker » Thu Jun 21, 2018 7:57 am

Ian,
maybe you could blank the n°4 and fit both to n°1 which is much easier to access. With shorter run to Servo also.

On my Sprint there is a plug/blank in n°4
Alan
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