Lotus Elan

Tonight's Three Newbie Questions!

PostPost by: jonnyconcrete » Wed Jul 28, 2010 7:45 pm

Question 1. Are the head exhaust gaskets exclusively Lotus, or is there a Halfords alternative, I need one in a hurry?

Question 2. Electronic ignition on the way...how can I set TDC on number 1 with both valves closed, without taking off the cam box cover (not sure I want to risk the gasket)?

Question 3. Which end is number 1?
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PostPost by: dusty » Wed Jul 28, 2010 8:28 pm

jonnyconcrete wrote:Question 1. Are the head exhaust gaskets exclusively Lotus, or is there a Halfords alternative, I need one in a hurry?

Question 2. Electronic ignition on the way...how can I set TDC on number 1 with both valves closed, without taking off the cam box cover (not sure I want to risk the gasket)?

Question 3. Which end is number 1?



1. Halfords won't have them, could probably get gasket paper from a motor factors. But if a job's worth doing......

2.remove the spark plug and put your thumb over the hole, TDC on number one (At the front) is the compression stroke so you should feel pressure in the cylinder.

3. answered above..

Cheers
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PostPost by: types26/36 » Thu Jul 29, 2010 6:09 am

[quote="jonnyconcrete"]Question 1. Are the head exhaust gaskets exclusively Lotus,
quote]

You can use VW Beetle (air cooled) exhaust gaskets with slight modification
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PostPost by: paddy » Thu Jul 29, 2010 7:42 am

jonnyconcrete wrote:how can I set TDC on number 1 with both valves closed, without taking off the cam box cover?


Even easier is remove the oil filler cap. You can see the exhaust cam for the #4 cylinder (ie the one nearest the windscreen). When #1 is at TDC on compression, #4 will have the exhaust just closing and inlet just opening - so the cam will be pointing down towards the valve instead of up.

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PostPost by: Robbie693 » Thu Jul 29, 2010 10:48 am

Similar to Paddy, Miles Wilkins suggests that when at TDC the cam lobes on no. 4 should be pointing toward one another when on the end of the compression stroke.

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Last edited by Robbie693 on Thu Jul 29, 2010 3:46 pm, edited 1 time in total.
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PostPost by: CBUEB1771 » Thu Jul 29, 2010 2:09 pm

jonnyconcrete wrote:how can I set TDC on number 1 with both valves closed, without taking off the cam box cover


You can also remove the oil filler cap and observe the position of the exhaust cam lobe on #4. With #1 at TDC at the end of the compression stroke #4 will be at TDC at the end of the exhaust stroke and so the #4 exhaust valve will still be open on the overlap.
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PostPost by: jonnyconcrete » Thu Jul 29, 2010 8:23 pm

Thanks guys, I have a new one...loosen the plugs until they are on maybe 1 thread...and as the pistons move, you can here the compression strokes in turn as they move through the block!
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