Lotus Elan

replacement camshaft for Elan S4

PostPost by: stebbs » Sun Jun 14, 2020 12:53 am

I need to buy a new camshaft for the broken exhaust camshaft that recently sheared on my 69 Elan. It's hard to find where to get this. There are plenty of discussions around different cams and upgrading but I just want a replacement for what I have. If it helps I see some sort of part number on them: MC23929 and B26E351.
Does anyone have a suggestion where I can buy this replacement? I'm in the US (soCal). I am also going to attempt to remove and inspect the valves. I don't see any obvious damage but there were several attempts I made to start the car unaware of the camshaft issue.
If anyone knows of a place in the Ventura County area that rebuilds heads and could also take care of the camshaft that would be preferable.
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PostPost by: 2cams70 » Sun Jun 14, 2020 2:24 am

You can get new standard profile camshafts from QED. Not cheap though.

https://qedmotorsport.co.uk/product/sta ... lled-cast/
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PostPost by: Mike Ostrov » Sun Jun 14, 2020 2:51 am

I might have a single for you. Please tell me how many grooves? Have a Lotus BBQ, tech seminar and swap meet at my shop tomorrow, so, might not get to it till Monday. Any questions, please call 510-232-7764 or mikeostrov at webtv.net directly, The PM system, sometimes does not function with my old grumpy laptop.
Cheers. Mike, in Richmond, CA, near Berkeley.
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PostPost by: stebbs » Sun Jun 14, 2020 6:46 pm

Appreciate both the responses. I'm no expert but it looks like there is one groove. I'm attaching a photo of the good one but they look the same. The broken one is on the exhaust side. Let me know if the one you have looks like it's a match. On the QED site it states "For identification purposes, original standard camshafts had no oil groove." so not sure if this is standard now.
Attachments
camshaft.JPG and
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PostPost by: alan.barker » Sun Jun 14, 2020 6:57 pm

On a Sprint you should have 2 grooves if it has weber or dellorto carbs.
We are talking about ident grooves.
Is this the first time you have worked on a twink.
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PostPost by: stebbs » Sun Jun 14, 2020 7:09 pm

It's not a sprint. Elan S4. Stromberg carbs. Yes, it's the first time I've worked on one of these and I have little idea what I'm doing but eager to learn. Think in terms of knowing absolutely nothing and I'm one level below that. On the other hand I have some time on my hands combined with little resources that I know of in my area.
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PostPost by: oldelanman » Sun Jun 14, 2020 7:32 pm

stebbs wrote:Appreciate both the responses. I'm no expert but it looks like there is one groove. I'm attaching a photo of the good one but they look the same. The broken one is on the exhaust side. Let me know if the one you have looks like it's a match. On the QED site it states "For identification purposes, original standard camshafts had no oil groove." so not sure if this is standard now.


Your photo doesn't show the sprocket boss where the identification groove(s) are located. I believe you have a Stromberg engine so if it's Standard federal or early Big Valve federal spec you would expect a C type cam with a single groove and if it's the later Big Valve with high compression head it would be an E type cam with no grooves ... according to the data in Miles Wilkins book.

This is a C type cam in a UK spec Stromberg engine...

Valve gear 002(b).jpg and
Identifier groove C type cam
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PostPost by: saildrive2001 » Sun Jun 14, 2020 8:03 pm

The Stromberg SE UK spec car has two grooves, I believe these are the same cams as in the Weber Sprint cars.
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PostPost by: stebbs » Sun Jun 14, 2020 8:33 pm

It looks like it has a single groove.Maybe this means the following is the correct one? https://qedmotorsport.co.uk/product/se-camshaft-chilled-cast/. Here's a picture that probably makes more sense. This is obviously the broken camshaft and sprocket.
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sprocket.JPG and
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PostPost by: pharriso » Sun Jun 14, 2020 9:39 pm

Lotus only sold S4s with the SE spec in the US, so should have 1 groove on the cam.
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PostPost by: Mike Ostrov » Mon Jun 15, 2020 9:49 pm

I do have a cam for your S4. Please send me an email directly and will send some pictures this evening. Many thanks. Mike. Details at the bottom.
[email protected] or (5l0) 232-7764
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PostPost by: knockoffnut » Tue Jun 23, 2020 7:34 pm

if you are still looking, I also have spare cams on the shelf.
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PostPost by: stebbs » Tue Jun 23, 2020 8:55 pm

I was able to get one from mike but it's always good to have sources for parts as I'm sure I will need many more. I am now expanding the project by removing the engine and replacing parts that look like they need it. I have valves on order too so I will be busy with the head for a while. Thanks
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