Stromberg Question
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I recently removed a pair of Stromberg carburettors from my 1969 S4 Lotus Elan. I had them for sale on eBay, but the buyer returned them because the needles could not be adjusted. I did not realise this. I did a bit of research and found on a Triumph website that Stromberg created carburettors for about a year. Does anyone have any information about whether these were fitted to the Lotus Elan?
- whaig
- First Gear
- Posts: 15
- Joined: 30 Jun 2012
My 69 S4 was fitted with Strombergs...they were a common carburettor of the day and despite what many people say, we in the garage trade regarded them as a good reliable instrument. The Triumph website is talking crap, they were making Carbs before WW1...many manufacturers used them over many decades.
From October 1968
From October 1968
- Sadbrewer
- Second Gear
- Posts: 103
- Joined: 31 May 2021
As noted above, initial Strombergs on Elans were fixed needle - when Lotus started offering Elans with Strombergs in non-emissions markets (1970), they offered adjustable needle Strombergs. There is a Lotus Service Bulletin describing jet adjustment on the fixed needle carbs - if not in the wiki here you should be able to find it by searching this forum.
Here's the listing of variants...
Here's the listing of variants...
Henry
69 Elan S4
65 Seven S2
69 Elan S4
65 Seven S2
- SENC
- Coveted Fifth Gear
- Posts: 1071
- Joined: 30 Dec 2015
My +2 has a federal engine converted back to UK spec, and has fixed jet Stromberg carbs. On my carbs the main jet is not adjustable. However, mixture adjustment can still be made as follows:
1. Unscrew and remove the damper.
2. Take off the top of the carb (4 screws)
3. Loosen the diaphragm at its edge and take off the piston, diaphragm, and needle assembly.
4. Get hold of a well fitting flat screwdriver and loosen the needle holder grub screw, accessible through a hole in the side of the piston.
5. The needle can now be moved in and out of the piston to adjust the mixture before retightening the grub screw - not too tight! The starting point is aligning the needle shoulder with the bottom face of the piston, without pulling the needle out (it's spring mounted). Then check your mixture and spark plug colour and re-adjust accordingly.
Sounds tedious but it's not too bad.
Dave Chapman.
1. Unscrew and remove the damper.
2. Take off the top of the carb (4 screws)
3. Loosen the diaphragm at its edge and take off the piston, diaphragm, and needle assembly.
4. Get hold of a well fitting flat screwdriver and loosen the needle holder grub screw, accessible through a hole in the side of the piston.
5. The needle can now be moved in and out of the piston to adjust the mixture before retightening the grub screw - not too tight! The starting point is aligning the needle shoulder with the bottom face of the piston, without pulling the needle out (it's spring mounted). Then check your mixture and spark plug colour and re-adjust accordingly.
Sounds tedious but it's not too bad.
Dave Chapman.
- david.g.chapman
- Fourth Gear
- Posts: 815
- Joined: 26 Nov 2003
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