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MG Midget and Sprite Technical - Weber DCOE

Weber 45DCOE 152.....

Could someone tell me if theres a stripdown guide on the internet for a DCOE carb?

Also wheres the best place to get a rebuild kit, jets/spares? I presume webcon but my PC is blocking it as a "threatening site" at the moment!

Also I know these carbs really need rolling roading to get them set up, but would someone be able to tell me what chokes, jets would be suitable to get it up and running. The car (at the moment) is a standard 1500 engine, but with a tubular manifold and peco system.


D Tetley

email me for a file...
Toby Anscombe

heres what we have on the MGCC midgetregister website
It what I have been doing for many years. I hate getting old. :-(

http://www.mgcars.org.uk/mgcc/midgetreg/Weber.shtml

If you want anything in particular let me know and I can send it to you.

The weber dcoe requires very little maintenance and all the jets/chokes are easily changed.

It is best to have it rolling roaded but driving and feeling what it is doing can give you good guidence to what needs to be done.
Robert (Bob) Midget Turbo

You're better taking it to an experienced engine tuner who knows both about Midgets and Webers. It can work out quite expensive if you are swapping jets etc. They usually have a selection to play around with to get the best setting. Once it's done, they are almost maintenance free.
Cheers John
JOHN HALL & JULIE ROBERTS

Dave I have a good selection of Weber Jets, Tubes and chokes etc, so may be able to help with initial set up. Malpassi Concessionairs (Check spelling) were where I used to get my Weber parts from.

See you at the meeting tonight?

Mark.
M T Boldry

I need a couple of 60 pilots if you have them Mark, F whatever you like :-)
Robert (Bob) Midget Turbo

Thanks for the email Toby, I’m sure that will be useful.

I probably will take you up on that offer Mark or someone might want to swap whatever I take out of the carb? (Sorry I cant be at the meeting, I’m racing this weekend so I've got a fair amount to do, I WILL be at the Newby hall show on the 19 July though.

I've just bought another 45 tonight, with a bad ebay description and no pic so we will see what its like, but it's meant to be new, and it was cheap! (the other carb I only really got the for the manifold as the body has a crack in it, which was worse than I thought! but again it was very cheap)

So now I just need to work out what I need from Rob's link to get it roughly somewhere and the throttle cable bracket, Im awaiting a electric fuel pump to come tomorrow so thats another thing to get ready to go straight on.

Does anyone have any close up/detailed pictures of a single 45 on a 1500 engine?
D Tetley

Could someone tell me where to get the tool's or is there another way of removing the venturi's and aux. venturi's?
D Tetley

Don't think you need any special tools but a plier, screwdriver and spanner. bend open the locktabs, unscrew two bolts per barrel, stick your fingers in the backside (?) and take out the venturi's and chokes.
Alex G Matla

D Tetley,

http://www.amazon.co.uk/Build-Power-Dellorto-Carburettors-Speedpro/dp/1903706750

I can recommend this book.
Brad (Sprite IV 1380)

Dave, just undo the hex screws underneath the barrels of the carb, these are all that hold in the venturies etc...

Bob, I'll take a look for you, text me a reminder tomorrow. 07889 799033

Mark.
M T Boldry

Thanks Mark/Alex, Just wanted to be sure because the manual that I got from Toby shows these tools, having un-done the said bolts they came out dead easy....

http://i2.photobucket.com/albums/y14/britaxcooper/weber.jpg

D Tetley

According to a few links, a 34mm choke is suggested, I work out that a 1500 needs a 30mm choke max as they're not exactly high revving!

Am I right in thinking a 30mm would be better? I've checked all the jets and its set up according to the "triumph tune" catalogue, which makes sense as the previous owner said he got it from moss...

Choke 34
Aux Vent 4.5
Main 145
Emulsion F16
Air jet 155
Pump 45
Idler 55F8

With my workings from http://www.mgcars.org.uk/mgcc/midgetreg/Weber.shtml I get

Choke 30
Aux Vent (not sure how to work this out as its not mentioned)
Main 128
Emulsion F16
Air jet 178
Idler 40F8

Should I keep what I have already or are my workings correct to get a rough/up and running set up?

Also Weber's site suggests

Choke 34
Aux Vent 3.5
Main 150
Emulsion F2
Air jet 175
Idler 55F8
Pump 50
D Tetley

Dave, I think a 30 choke will be too small, OK, it's not a revving motor, but I still think 32 or 34 would be better.
You have not mentioned if you are running a single or twin carb set up, if it's twin, I would strongly suggest that you opt for 40s and not 45s.
I also think you'll need to carry out at least some mild tuning on the engine to make the best out of a Weber carb set up, otherwise it'll be a thirsty all noise and no go Midget.....
Call me if you need.

Mark.
M T Boldry

I agree with Mark,
when i put a 45DHLA on it was because the engine was tuned enough to need one.
Buy the book i mentioned earlier, it has a good section on tuning the carb.
A RR tune is usually only for WOT, but its getting the progressions correct on a twin choke carb that makes it either a joy or a misery to drive.
Brad (Sprite IV 1380)

Echo Mark's and Brad's comments about noise and driveability. I fitted a '45 to our 1380 and yes, it did produce 4 more bhp than the HIF6 on a back-to-back rolling road session, BUT the noise was 'orrible and the driveability was very different from the SU.

It's back on the SU, but without the MG Metro airbox and K&N filter, which robbed it of 8 bhp, but the comparison is not exact as the CR has been increased from ~9.0:1 to 10.4:1, so we now have more than the '45, but Metro turbo here we come!

DT - do you have 1 or 2 45's? If 2, running 2 x 45's with 30 chokes would indicate that 2 x 40's could be more appropriate?

Richard
Richard Wale

Hi Guys, in answer to the set up... I was planning on using a single 45, currently fitted with 34 chokes as posted above.

With the 1st (jiggered) carb + manifold costing £40 and the other carb "new" at £75, I couldn’t really say no could I?
I'm expecting a weber to require (once set up) less maintenance than the SU's rather than a gain in power as I realise there's little in it, especially as the engine isn’t modified, but I would like to give it a try. I am however intending on building another engine to a mild spec when I get time as its something I would like to do myself, in the mean time I'm collecting bits, aswell as the other half saving up for a 5 speed conversion (the cars in everyday use, with any long trips being taken in the midget as I use a bike daily)
D Tetley

This thread was discussed between 03/06/2009 and 11/06/2009

MG Midget and Sprite Technical index

This thread is from the archive. The Live MG Midget and Sprite Technical BBS is active now.