Lotus Elan

Compression test

PostPost by: JonB » Fri Mar 16, 2018 5:36 pm

Hello again

Good news today, I think. I performed a compression test on my engine and the results were as follows:

cylinder-1.jpg and
Cylinder 1 - 192 psi

cylinder-2.jpg and
Cylinder 2 - 198 psi

cylinder-3.jpg and
Cylinder 3 - 192 psi

cylinder-4.jpg and
Cylinder 4 - 198 psi


So that's a relief...! The last time this engine was taken apart was (according to the receipts) in 1991, about 42,000 miles ago. Result..?

It's a bit of a shame that I will have to take the head off to resolve the oil leaks, but at least I have a baseline for the compression readings now.
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PostPost by: SENC » Fri Mar 16, 2018 10:36 pm

Don't go messing up your rust protection system, Jon!
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PostPost by: MarkDa » Sat Mar 17, 2018 12:16 am

Very impressive!
Will you be able to restrain yourself to oil leaks only?!
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PostPost by: JonB » Sat Mar 17, 2018 8:53 am

Well, oil leaks. Hard to see where they are coming from, despite cleaning the engine in situ. I might be lucky and find it's the cam cover gasket, but I don't get lucky often with this car.

Anyway, looks like my rings and valves are good. I did this just to be sure, as there are no symptoms of damage and it only took half an hour.
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PostPost by: Peter +2 » Sat Mar 17, 2018 10:15 am

Jon

I ended up taking the sump off mine to fix a horrible leak only to discover it was the Cylinder Head Oil breather / drain rubber.

3 days spent on the sump.

Half hour removing and replacing the drainer which had shrunk and become loose.

All done in situ.

What fun.

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PostPost by: jono » Thu Mar 22, 2018 8:32 am

Peter,

My drain tube did the opposite! - it swelled up like a banana reducing the internal orifice to 50% of the original size.

The resulting reduction in crank breathing did not help with my oil leaks!

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