Lotus Elan

TC engine block identification

PostPost by: fjrtel » Wed Nov 06, 2019 6:51 am

Hi guys, first-time post, so please let me know if the answer to my question has already been done to death!

I should first tell you that I am in Australia. The S2 Elan I've just acquired has definitely lived in Oz since 1967 (and, I suspect, since 1965), and I'm trying to get it's complete history, hence this post.

My unit number scratched in the ID plate is 4193, the chassis number is, of course, 26/4193.

No engine number is recorded on this plate, but the block carries the number LP26251LBA. Looking at some posts, I seem to have too many digits, but I assure you all, that's the number.

On the LHS of the block, I've got A cast next to a clock face mark, and towards the rear I have T11. There is no L behind the RHS engine mount.

Finally (sorry!), at the rear of the head, on the "bridge" below the cam cover are some cast (not etched or stamped) details:

26E311
WM
LM8 WP

laid out exactly like that.

I'll be extremely grateful for any help that you guys can offer. It's gunna be a long resto (everything's tired and worn), but knowing the engine might be the original will be a big bonus.

Cheers,
Terry
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PostPost by: Famous Frank » Tue Nov 12, 2019 4:34 pm

I too have an engine number question and if I'm mistakenly hijacking someone's thread please say so politely and I'll be happy to open an separate question.

I recently purchased a Elan 26R. The car originally came with engine number #15641002. Now over the years I've learned a little about LA blocks, LB blocks etc. But until now I never gave it much thought. In the past I only worried about having enough wall thickness for the next bore job. But now I want to learn about this 8 digit number. Where do I find that number and does anyone know anymore about this engine number?

Many thanks,
Frank
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PostPost by: nmauduit » Tue Nov 12, 2019 7:58 pm

26/4193 would have been equiped in 1965 with an engine SN with 4 digit I believe, so LP 26251 LBA , which is a legit elan engine number, would have been a later replacement.

Andy Graham, Lotus archivist, may be able to provide some information about your car : you should be able to contact him via the forum as LotusArchives

as for the 8 digit number on the engine of the 26R, a photo may be of help (stamping location etc), though what first comes to mind is your signature indicating 1966 26R... do you mean a GTS built from a 1966 car or chassis?
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PostPost by: rgh0 » Tue Nov 12, 2019 8:01 pm

Famous Frank wrote:I too have an engine number question and if I'm mistakenly hijacking someone's thread please say so politely and I'll be happy to open an separate question.

I recently purchased a Elan 26R. The car originally came with engine number #15641002. Now over the years I've learned a little about LA blocks, LB blocks etc. But until now I never gave it much thought. In the past I only worried about having enough wall thickness for the next bore job. But now I want to learn about this 8 digit number. Where do I find that number and does anyone know anymore about this engine number?

Many thanks,
Frank


26R engines were assembled by Cosworth and BRM so I presume they used a different numbering system for them..
I know Cosworth had a type number code for their engines so the code may be 15 - engine type, 64 year 1002 engine serial number.

cheers
Rohan
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PostPost by: rgh0 » Wed Nov 13, 2019 11:01 am

Thinking about it and the low numbers of engines built for 26R's the 6410 numbers may be year and month and 02 be the engine serial number built in that month.

Maybe Cosworth can tell you more about their engine numbering system back then. Lots of other Cosworth twinks in open wheelers from the era also so maybe others know more about Cosworth engine numbers. Be interesting to see what other "original 26R" know about their engine numbers

cheers
Rohan
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PostPost by: trw99 » Wed Nov 13, 2019 11:50 am

Terry,

Your car was invoiced by Lotus on 23rd December 1964. It was fitted with Engine No LP2625. That is in the same four number series as the surrounding cars of the era.

Frank,

Your 26R Engine No 15 64 1002 is a Cosworth number, as used on the Series 1 26Rs.

The 15 was Cosworth code for the Twincam (Mk.XV (1594 cc, wet sump, 130-140 bhp, for Lotus 26R and Lotus Cortina); 64 the year built and the next two numbers were perhaps a batch number followed by the last two numbers being the engine no itself.

Out of interest, Engine No 15 64 1006 is fitted to Tojiro Ukiya's 26-R-27 on display at the Toyota Museum in Japan in virtually original condition.

Tim
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