Lotus Elan

Hardened valve seats

PostPost by: Donels » Tue Apr 16, 2019 10:55 am

I have just stripped my engine for rebuild and it’s in remarkably good condition. The pistons look like new and there are honing marks at the tops of the bores. I don’t know the history of the engine other than its last MOT was in 2003, so I’m guessing it was overhauled shortly before that. The head is in excellent condition as are the valve seats. The question I have is are the valve seats hardened for unleaded fuel?
Anyone know how to tell before I commit to replace them?

Dave
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PostPost by: rgh0 » Tue Apr 16, 2019 11:12 am

The original valve seats were hard enough for unleaded fuel. If they have been replaced with new seats at anytime in the heads life they are probably as hard or harder. No need to replace valve seats if the are in good condition and the valves are seated at the right height in them and you're not doing a race engine with bigger valves and ports.

cheers
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PostPost by: Thornts » Tue Apr 16, 2019 11:26 am

+1 to Rohan's post (not that he needs it - sure he's forgotten far more about twincs than I'll ever know!). Result Dave! You'll be in it for at Donny then...
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Rob
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PostPost by: Donels » Tue Apr 16, 2019 5:14 pm

Thanks Rohan. Saved me some cash to spend on other bits.

Not in the +2 this year Rob. I'll be in a beautiful S1 Elise.

Dave
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PostPost by: Thornts » Wed Apr 17, 2019 8:26 am

And I won't - either way! I'll PM you
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Rob
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