Lotus Elan

45 DCOE 9 VS 13

PostPost by: twincamman » Sun Jan 23, 2011 5:10 pm

I have a set with the same casting differences ---but both are stamped DCOE18----the castings are completely Identical to yours as both the tops are different ---they worked on the elan but were never spot on --so I replaced them with an eye to wasting one on the 948 sprite motor and matching the other for the cortina motor [althoI don't have a Cortina - if you have 2 shoe sizes left 8 1/2 and right 11 and limp we may be able to work a deal :) postage to the U K may be a bear though ---ED
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PostPost by: SJ Lambert » Fri Jul 29, 2011 2:05 pm

I've just got a second pair of 45 DCOE 9s to run on a T/C race motor in an open wheeler - will probably be around 1600cc capacity with a McCoy ported head. Long rods and short pistons.

Will undoubtedly dyno engine when it goes together, which may be some point in time in the reasonabley distant future - but while I gather it all together I ought look to collect a varying range of chokes, air correctors, mains and emulsion tubes etc for track day experimentation as well?

The original period motor has 40mm chokes - So, say new engine dynos well with 40s, is it worth trying 39s on the track as well to see whether such variations improve driveability? - though I don't have the original DCOEs to hand at the moment to check the rest of their calibration, I imagine that mains and air correctors for the new motor may end up being set around the 160 mark for each. Seems like aux venturis are often 4.5s - I presume that's what most 45s have - so wonder whether atmospheric variations ever call for changes to set up or once you obtain a good calibration should you "stick with it"?

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James
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PostPost by: rgh0 » Sat Jul 30, 2011 5:20 am

Depends on what cams you end up running but i doubt you will see any benefit in using any thing larger than 38mm chokes for the engine you are planning on building.

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PostPost by: SJ Lambert » Sat Jul 30, 2011 8:46 am

Thanks Rohan, I'll start getting together the jets that I'll need.
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PostPost by: SJ Lambert » Sat Jul 30, 2011 11:03 am

Still haven't discovered what the difference between the 9 and 13 is.

Were either fitted to any particular vehicles as original equipment?

Edit - looks like the Aston Martin DB 4/5/6 ?? may have had the "9"s and an Alfa in triples as well - so looks like they at least were aimed at a choke per inlet tract.........
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PostPost by: twincamman » Sat Jul 30, 2011 6:57 pm

4......???????
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PostPost by: bill308 » Sun Jul 31, 2011 3:45 am

James,

Didn't George state that the progression holes were different in his post of May 02?

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PostPost by: gino1 » Fri Aug 05, 2011 4:37 am

Hi all,
Both the carbs in the pics look original to me. The Spanish repros have a triangular shaped strip on the top right hand side. It doesn't do anything and I think it was introduced just to distinguish theirs from the originals, everything esle appears to be identical.
Gino
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PostPost by: florawills » Fri Aug 12, 2011 11:35 am

gino1 wrote:Hi all,
Both the carbs in the pics look original to me. The Spanish repros have a triangular shaped strip on the top right hand side. It doesn't do anything and I think it was introduced just to distinguish theirs from the originals, everything esle appears to be identical.
Gino
Milano
italy


Hi gino1,

Yes 45 DCOE 9 Weber shares the same performance characteristics as the 45 DCOE 152 carbs and it deals for historic applications and those who prefer a cleaner & original look.

The only difference that matters between carbs of different spec numbers is the location of the progression holes. If you're trying to use two carbs with different progression holes on the same engine, you won't be able to get it to run decently at idle and low rpm. The progression holes are visible by removing the small brass plug just next to the mixture screw adjacent to each bore. It is not easy to modify - there are other threads about that.
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PostPost by: SJ Lambert » Mon Jun 11, 2018 11:28 am

03813c50-3cb6-450f-8a6d-2b0a82b0e14b.jpeg and


I’m just putting the original 9s back on my car and have noticed a tiny difference in the body castings between the other pair (the others are said to have been a triple set that had the middle one cracked from an Aston Martin)

Both pairs are Italian.
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PostPost by: SJ Lambert » Mon Jun 11, 2018 11:33 am

96fb7f2a-5793-459f-9136-42c25c7d3a78.jpeg and



139a0326-1960-427d-864f-4103c53a419f.jpeg and



I noticed today that the auxiliary venturis in my original 45s are "one armed" too!
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