TonyB Posted January 15, 2002 Share Posted January 15, 2002 Can anyone tell me the difference between a 40DCOE2 and a 40DCOE18? Is it just the jetting? Regards Tony Bates SB1761 - 1963 Lotus Super Seven Cosworth Link to comment Share on other sites More sharing options...
Casbar Posted January 15, 2002 Share Posted January 15, 2002 Don't think it has anything to do with jetting. I think its the build/model number. My 40's are "51's" Link to comment Share on other sites More sharing options...
Brian Posted January 15, 2002 Share Posted January 15, 2002 I hope the following will help The first numbers (40) indicate the size of the throttle plate The letters indicate the general type of carb DC means doppio corpo or double throat O means orizzontale (Horizontal) E means Die-cast Numbers following the type indicate variations of the basic type The 40DCOE2 was used on Sprites,Midgets, Cortina,BMW2002 etc. The 40DCOE18 was used on Midgets, Sprites,TR3,GT6,TR7 Are you getting bored yet? In their origianal form they would have been jetted different. Regards Brian smile.gif Link to comment Share on other sites More sharing options...
Brian Posted January 16, 2002 Share Posted January 16, 2002 oops! I picked up my class of scotch which I was using to hold down the page on my Weber tables and the page flicked over! The 40DCOE2 was originally fitted to the Alpha Romeo The 40DCOE18 was origanally fitted to Lotus cars The only technical problem that you may have is if you need to get a repair kit. The part number for the DCOE2 is 92.1047.05 For the DCOE18 it is 92.1046.05 The gasket set uses the same part number - 92.0015.05 The information earlier was from the conversion tables blush.gif Regards Brian Link to comment Share on other sites More sharing options...
TonyB Posted January 16, 2002 Author Share Posted January 16, 2002 Hi Brian, Thanks for the info. Apparently the DCOE2 was used oon 1500cc pre crossflow Lotus Sevens and the DCOE18 were used on the twin cams. Other than that i assume the only differences was the jetting It's all very confusing..... Regsards Tony Bates SB1761 - 1963 Lotus Super Seven Cosworth Link to comment Share on other sites More sharing options...
Nigel Riches Posted January 16, 2002 Share Posted January 16, 2002 Tony, try a search on the tech talk threads, as there has been much about Weber carbs, one I recall had a link to the Weber importers or agents with a technical help address, I can't find the site now, but feel someone out there would be able to assist, regards Nigel. Link to comment Share on other sites More sharing options...
oilyhands Posted January 16, 2002 Share Posted January 16, 2002 The only difference I can see apart from original jetting is in the float valve size, which is presumably why the repair kit is different and the gasket kit the same, the 2 uses a 2.0 float valve since its original application was for a larger capacity engine, the 18 uses a 1.75, it's entirely possible that these have been changed at some time during the carbs history. Oily Link to comment Share on other sites More sharing options...
Noel Mclaughlin Posted January 16, 2002 Share Posted January 16, 2002 I was told by a very knowledgeable performance tuner that I know that the "end numbers" refer to the arrangement of the idle progression discharge holes situated near the edge of the throttle plate. As some engines require different arrays of these. Weber would ,for OEM users calibrate carbs to suit. This explains why when some people have gathered up a "pair" of carbs they have ended up with an undriveable untuneable pig due to mismatched progression off idle. Link to comment Share on other sites More sharing options...
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