Webers

[phunkynova]

I have just got a pair of Weber 40 DCOE's from German Ebay but I can not find out any info specification on this particular type.
They are : Type 40 DCOE 88 and 40 DCOE 89.
Dose any one have any info about these type 40's ie which car they where fitted to what spec they have from jet's ect ?.

[mowgli]

they were fitted as OE to a bmw alpina 2000.. seriously.

i found something on a pdf for the haynes weber carbs...

[linky] (http://www.ferraridatabase.com/The_Downloads/The%20Documents/Haynes%20Manual%20Weber%20DCNF%20246%20308%20Chapt er%2013.pdf) look on page 12/18

i'll keep digging

[mowgli]

more precisely, it appears to have been an option on a mid - late 60's bmw 2000ti.

http://www.musica-ex-machina.de/user_files/stempsy/BMW2000Tilux/Motoreinbau-2009/Stempsy%202000%20TI%20004.jpg

[millworm]

out of interest what are mine out of then?
http://i271.photobucket.com/albums/jj141/millworm95/4fa3d5c2-dd52-4807-9896-4003ace21793_zpsed7efd9e.jpg (http://s271.photobucket.com/user/millworm95/media/4fa3d5c2-dd52-4807-9896-4003ace21793_zpsed7efd9e.jpg.html)
http://i271.photobucket.com/albums/jj141/millworm95/4bed0ef3-092a-46f0-9524-86761434c4a0_zpsa2a39c7a.jpg (http://s271.photobucket.com/user/millworm95/media/4bed0ef3-092a-46f0-9524-86761434c4a0_zpsa2a39c7a.jpg.html)

[Southie]

Millworm, have a read through this it may explain a little bit for you: PRESSTHIS (http://www.pistonheads.com/gassing/topic.asp?h=8&f=34&t=1226428&i=20&mid=0&nmt=Air+filters)
and THIS (http://twincarbs.com/weber-dcoe-factory-jetting-for-alfa-romeo.html)

Looks like Alfa Romeo.

[garyc]

take the jets out and see what they are, they may have been changed from std

[millworm]

Millworm, have a read through this it may explain a little bit for you: PRESSTHIS (http://www.pistonheads.com/gassing/topic.asp?h=8&f=34&t=1226428&i=20&mid=0&nmt=Air+filters)
and THIS (http://twincarbs.com/weber-dcoe-factory-jetting-for-alfa-romeo.html)

Looks like Alfa Romeo.

Cheers, got to drive it on them for mot before they're setup because im poor and can't afford a trailer. seemed to idle ok but don't want to cook her before she's even turned a wheel on her own power

[Southie]

Cheers, got to drive it on them for mot before they're setup because im poor and can't afford a trailer. seemed to idle ok but don't want to cook her before she's even turned a wheel on her own power
Be careful the fuelling will be all over and you may do more damage than good, if over or under fuelling the emissions won't pass an mot. Also the engine may suffer with over/under fuelling and may also get too hot and melt something.

[millworm]

Be careful the fuelling will be all over and you may do more damage than good, if over or under fuelling the emissions won't pass an mot. Also the engine may suffer with over/under fuelling and may also get too hot and melt something.

I have no choice unfortunately :(

[jimbob-mcgrew]

you could probably get them half way there, by pulling all the plugs out repeatedly to check the burn colour, and tweaking the carbs one by one.

unfortunatly the car has to be driven to do this tho, as theyll just soot up if checked from idling, and you wont get an accurate colour.

if its running lean, and needs jets etc switching, probably not a good idea to drive it much, as it will run hot like you say, and may do damage.

[millworm]

just bought a wideband sensor so i can monitor, now i just need to cut a hole in the mani to fit it lol

[hotrod]

I found this helpful when I did mine. Not perfect but gets you pretty close! http://i1246.photobucket.com/albums/gg609/HOT-ROD77/Mobile%20Uploads/2014-10/Screenshot_2014-10-29-22-41-23.png (http://s1246.photobucket.com/user/HOT-ROD77/media/Mobile%20Uploads/2014-10/Screenshot_2014-10-29-22-41-23.png.html)

[millworm]

that looks a lot more sensible than just spending 149 on an o2 sensor. sh!t. lol

[phunkynova]

they were fitted as OE to a bmw alpina 2000.. seriously.

i found something on a pdf for the haynes weber carbs...

[linky] (http://www.ferraridatabase.com/The_Downloads/The%20Documents/Haynes%20Manual%20Weber%20DCNF%20246%20308%20Chapt er%2013.pdf) look on page 12/18

i'll keep digging


Thank's for the info mowgli that's a big help :thumb:

[phunkynova]

millworm your Weber's are not a matched pair and will not work properly together. Weber's come in set ie 32 and 32 or in following number order ie 178 and 179 you a 34 and a 2 they are not meant to run together and from what little I know and have been told you must always have a matched pair.
But seek better advise from a wise man than me.

[Southie]

Never knew that phunky, just found some info from THIS (http://www.classicandperformancecar.com/features/theknowledge/214275/weber_carburettors.html):

If buying Webers, make sure they are matched (serial numbers identical or close) and that they are directionally correct. The float chambers should be positioned ahead of the main jets, so that under hard acceleration fuel surges to the main jet and cornering has little effect: get this wrong and the car will never perform well on the track.

[millworm]

Can I not completly gut the pair and completely rebuild them?

[jimbob-mcgrew]

ive got one of those colour tune kits.
there not amazingly accurate, as ive found out over the last several years.
if i do use it, i have to set things up quite a bit on the lean side, as spot-on what the manual says is 10-12% C.O (found out through various mot fails)

another annoying thing is, i have to repair it with duct tape everytime it gets used, as the plastic end of the spark plug extender lead melts apart from the heat of the exhaust manifold.

ive found its easier and more accurate to go by plug colour.

it might be of better use to you tho, as you have 4 independant carbs to setup. the tool wont be accurate, but it should make the fueling more normal.

i wouldnt bother using it in mid-day sunlight either, as you wont see anything in its glass window. youll need a dull cloudy day, or dusk/darkness to do it properly.

and one other important thing ive noticed whilst using this. when you adjust fueling mixtures, it will change your ignition timing several degrees. and vice-versa changing the tiiming, so its best to set both up, at the same time.

[mowgli]

Thank's for the info mowgli that's a big help :thumb:

it was a fun couple of minutes chasing round the interweb..

it'll be interesting to see how you get on with a 45 year old set of carbs... i'll hazard a guess that they were rather well made & in good condition

[BRoadGhost]

Mine's an early pair; which year did the modern design of dcoe come about? (the top plate is different).

[phunkynova]

Can I not completly gut the pair and completely rebuild them?

Millworn I found this a wed site:

When buying Webers second-hand ensure that they are a matched pair. Look carefully at the serial numbers on the top of the carbs, these should be the same, or very similar. If they are not then they are not a matched pair and may well give problems when trying to jet them, as the progression drillings could be different.

So they may not work together you should seek advise.

But if this helps the setting for Nova Sport the setting I'm going for and standard set up for new 151s:
Sport Mine Std
Coke size 28mm 32mm 30mm
Main jet 125 125 115
Emulsion tubes F16 F16 F11
Air correctors 170 170 200
Idle Jets 52 F26 45 F9 ?
Pump jets 40 40 ?
Auxiliary Vent 4.5 4.0 ?

[millworm]

Cheers mate, had an ask about and I should be ok according to him but I guess I'll have to wait and see.