Lotus Elan

Factory linered block

PostPost by: pptom » Wed Sep 18, 2019 8:49 pm

The L block in my '68 +2 was, i believe, linered from new. Its currently +40 and needs work.
I know i can't go any bigger on the liners, but i'm curious as to wether they could be machined out and new ones fitted?
I can't get it to the machine shop as its still driving my car around, i'd rather like a solution before i pull out the engine in the winter.
Anyone have any experience please?
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PostPost by: 2cams70 » Thu Sep 19, 2019 12:51 am

Probably not linered from new if it's currently at +0.040" with liners. There's both thick and thin walled liners available. The factory type are thin walled and should be replaced rather than re bored. Not easy to tell which type are fitted by looking at the top of the block as the thin walled type have a locating lip at the top which makes them appear thick walled. You really need to inspect from below where the conrod clearance cutouts are.

Both types should be replaceable however so not really a problem if it's currently at 0.040" OS.
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PostPost by: pptom » Thu Sep 19, 2019 5:26 am

Thanks very much 2cams, that puts my mind at ease a bit.
Took a risk on the rebuild last winter that it would be ok with a light hone as i couldn't stump up for liners and pistons at the time while rebuilding the rest of the car, but i think i'll treat it this winter.
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PostPost by: 512BB » Thu Sep 19, 2019 7:02 am

If you honed the bores last winter and new rings / gaps were within spec., you should not need to revisit for many thousands of miles. FWIW Knight's of Weedon come highly recomended up your way.

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PostPost by: pptom » Thu Sep 19, 2019 7:18 am

Knights did the work and it was a discussion with them about options at the time. Still have lips at the top of the bores, got one cylinder 15% down on compression and it smokes a bit. New rings gapped.
It was always going to be a stopgap solution until i could afford a rebore and new pistons as i concentrated the majority of the engine budget on the head / crank.
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PostPost by: alan.barker » Thu Sep 19, 2019 8:50 am

If you fit new Liners you can go back to standard bore dia. This will let you buy a set of original dia standard Pistons which are very cheap :wink: :wink: From Miles Wilkins or sjsportscars.
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PostPost by: pptom » Thu Sep 19, 2019 9:20 am

Thats the new plan, except I'm going Omega.
Took me just under a year to completely restore my +2 from a 'barn find' which had been sat for 25 years, so it was pretty full on with no part untouched. Having finished it I've found myself with idle hands and, despite making 118bhp, the engine isn't as perfect as i'd like. This gives me the perfect opportunity to get both of those issues sorted! and sets things up for the longer term project of FI.
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