View single post by Esprit2
 Posted: 09-09-2014 12:46 am
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Esprit2

 

Joined: 05-01-2005
Location: Minneapolis, Minnesota USA
Posts: 289
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The Weber Factory Settings for a 40DCOE-2, plus a couple other 40DCOE set-ups. All that really doesn't mean anything for your 907.

Model ........... DCOE-2 ... DCOE-32 ... DCOE-18 ... DCOE-151
Throat .......... 40 ............ 40 ............ 40 ............. 40
Choke .......... 33 ............ 32 ............ 30 ............. 30
Aux. Venturi... 4.5 ........... 4.5 ........... 4.5 ............ 4.5
Main Jet ........ 115 .......... 130 ........... 115 ........... 115
Emulsion Tube F16 .......... F9 ............. F11 ............ F11
Air Corrector.. 150 .......... 200 ........... 200 ........... 200
Pump Jet ....... 35 ........... 35 ............. 40 ............. 40
Idle jet .......... 50F9 ........ 50F8 ......... 45F9 .......... 45F9
Pump Bleed ... 55 ............ 60 ............ 50 ............. 50
Needle Valve.. 200 .......... 150 .......... 175 ............ 175
Float Height ... 8.5 ........... 8.5 ........... 8.5 (brass)
Float Droop ... 15 ............ 15 ............ 15 (brass)
Float Height ......................................................... 12(plastic)
App: ............. Maserati .... Alfa .......... Lotus ......... Modern
..................... 3500 GT .... 1750 ........ Elan & ........ Weber
........................................................ Cortina ....... Box Stock
........................................................ 1558 cc
........................................................ Twin Cam

Weber nomenclature is not linear or logical.
The scale of Idle Jet Air Bleeds is:
Weaker ........................................... Richer
F3, F1, F7, F5, F4, F2, F13, F11, F8, F9, F12, F6

Sizes in common use are:
F2, F11, F8, F9, F6

Here's the generic, by-the-book standard jetting for a 1973 cc 4-cylinder, sucking on two 40DCOEs, and creating peak power at 6200 rpm... sounds about like a 907. Also included for comparison is the stock Dellorto jetting used by Jensen-Healey.

..................... Generic, by the book ...... Jensen-Healey OEM Jetting
.................... Power ......... Flexibility .... Emissions ... Non-Emissions
.................... WEBER ....... WEBER ........ Dellorto ..... Dellorto
Model ........... DCOE ......... DCOE ......... DHLA ......... DHLA
Throat .......... 40 ............ 40 ................ 40E ............ 40
Choke .......... 36 ............ 34 ................ 35 ............. 35
Main Jet ........ 145 .......... 140 .............. 130 ............ 130
Air Corrector.. 180 ......... 180 ............... 160 ............ 160
Emulsion Tube F9/F16/F2 ... F9/F16/F2 ... 7772-5 ........ 7772-5
Pump Jet ....... 40 .............. 40 ............. 45 .............. 45
Idle jet .......... 50F9 .......... 50F9 .......... 52-55 .......... 50
Idle Air Corrector ................................ 7850-5 ........ 7850-1
.......................................................... (leanest) ..... (mid-range)