Lotus Elan

45 DCOE 9 VS 13

PostPost by: cabc26b » Wed Apr 28, 2010 2:42 am

anybody know if there are differences between the 9 and the 13 ? I can't find any mention of the 13 in my haynes weber manual. I need to make up a pair for the motor I'm building . I have heard some people claiming the 15/16's are different but i have found no mention of the 13 .


Thanks


George
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PostPost by: Steve G » Wed Apr 28, 2010 10:46 am

If you don't get the info you want here then join this group;

http://autos.groups.yahoo.com/group/sidedraft_central/

And ask someone on there, a very knowledgeable bunch when it comes to all things sidedraft!

Edit: I have posted your question to the group, I will post the answers here.

My friend said this;

The difference between the different numbered carbs is the number of, size and position of progression holes. Now weber only make one kind the DCOE 151.
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PostPost by: Steve G » Wed Apr 28, 2010 11:42 am

I found this very useful website;

http://www.webercarburatori.com/?p=handbook&s=4

Could the number refer to the length of intake trumpet (air horn) in mms?
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PostPost by: cabc26b » Wed Apr 28, 2010 11:51 am

Hi Steve thanks for posting on the sidedraft forum -

I heard about the progression hole difference before - I also know from the manual I have that there are some differences in the accelerator pump stroke between the carbs.

The 9 like the 15/16 ,18/17 96/97 seems to be primarily a OEM carb - the 13 looks like an aftermarket item- The answer I want is the 13 is like the 9, and not like the 15...

George
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PostPost by: ivor badger » Wed Apr 28, 2010 4:05 pm

Back to mini days, oh what joy. 9s were made for Healy 3000s with one choke per cylinder. 13s were originally made for MGBs and eventually fitted to Minis with siamized inlet ports. The difference is in the slow run drillings to suit the ports. But the actual effects are apparently small, because they often ended up paired on Longman split Weber setups.
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PostPost by: bill308 » Wed Apr 28, 2010 10:47 pm

Specs for both the 9 an 13 appear in my Haynes manual. So here is the information shown:
45 DCOE.................................... 9..................13

choke size..................................32-38............33-34
venturi.......................................3.5-5.0..........3.5-4.5
main jet.....................................1.25-1.65.......1.3-1.6
emulsion tube..............................F2,F16,F20.....F2,F16
air corrector jet...........................1.50-1.90.......1.70-1.90
idle jet.......................................0.45-0.65.......0.45-0.55
idle jet.......................................F6,F8,F9........F4,F8,F9
accel pump jet............................0.40-0.60.......0.40-0.60
accel pmp int valve w/exh orifice....closed, 0.50....closed,0.50,0.55
needle valve...............................2.00,2.25........2.25

All information came from Appendix 2, Coversion equipment jet setting list. Above ranges are shown as n.nn-n.nn and where values were 3 or less, xxxx,xxxx,xxxx

Air horns would not have been described by the part number. From my experience, the number of progression holes, their position, their diameter, and linkage, may be described by the part number.

Both the 9 and 13 carbs appear to be aftermarket types based upon their Appendix 2 location. Neither of these carbs appear in Appendix 1, OEM jet setting list.

To my mind, the important thing to look at is whether the number of progression holes, their locations, and diameters, are the same. All else should be replaceable.

I hope this helps.
Bill
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PostPost by: cabc26b » Sun May 02, 2010 8:39 pm

HI guys,

Thanks for the replies. I spent some time looking them over - close but not exactly the same - the progression circuit/holes don't look the same and the pump stroke are different as well. I will look for a mate for the DCOE 9 -

I went and looked back a the Haynes I have - yup dcoe 13 listed in the appendix for after market , but not called out in the DCOE section where it talk about non- jet spec's - the OEM section also shows the 9 as OEM for Aston and Alfa.

George
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PostPost by: ivor badger » Mon May 03, 2010 12:53 pm

Pump stroke is adjustable. In fact almost everthing, bar the drillings is adjustable. This gives unbelievable opportunities to get it wrong.
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PostPost by: cabc26b » Tue May 25, 2010 1:16 pm

Ok - So I go out and get another 45DCOE9 to replace the 13 so I can have the same carbs on the engine - You would think that should do it .... NOT

Both carbs are Weber 45DCOE9's but they are not the same - The casting for the body is different , plus the one on the left has a 3 hole progression circuit.

I think I'll give these a shot on the engine before I go looking for yet another mate .


George
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45dcoe9s.JPG and
both say Bologna, but I think the one on the left is a Brazilian Weber....
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PostPost by: gjz30075 » Tue May 25, 2010 6:39 pm

George, its quite possible someone swapped the covers so you really don't have a 9. How does it compare to anything else you have?

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PostPost by: cabc26b » Wed May 26, 2010 1:48 pm

Hi, Greg

I had a whole table full of various Weber Carb off of 60's vintage cars - The carb on the left was not made in the same period of time ( we think its a Brazilian Weber )

George
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PostPost by: davidholroyd » Wed Jun 16, 2010 5:51 pm

Hello ...Have any of you had distributor fires or just 'fires' on new weber 45's

please see this thread on the weber forum

http://webcon.s4.bizhat.com/webcon-ftopic123.html

and my car

http://www.xlrefrigerators.com/lotuselan.htm

thanks

david
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PostPost by: rgh0 » Thu Jun 17, 2010 9:45 am

Luckily I have never had a fire but I have had fuel leakage from webers on the track when no leakage on the road. The fuel enrichment device air inlet area is the source. If the pistons dont seal properly then cornering forces can lead to fuel coming out. Maybe the Spanish webers are not made to close enough tolerances in this area and the pistons leak fuel.

cheers
Rohan
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PostPost by: ivor badger » Fri Sep 24, 2010 8:14 pm

Don't know if it's a Spanish one, but there's a 45 DCOE 9 on Ebay at the moment. Listed for midget/mini, so the wrong carb for an A series.
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PostPost by: cabc26b » Mon Sep 27, 2010 12:38 am

Thanks Ivor,

I am sticking with what I have until I know how the pair behave on the motor.

g
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