MGB with Weber DCOE and Long Branch Manifold

This is example of how the MGB engine with a stock camshaft may run using a Weber DCOE side draft carb. This clearly shows that this engine is not running evenly on all 4 cylinders. The Engine Analyzer is being used to kill individual cylinders at different engine speeds. At idle and intermediate speeds, the 1 and 4 cylinders are not delivering the same power as 2 and 3. Then at the higher engine speed, they get a little more even, but still not the same. Obviously this engine is not happy with this carburetor. This video is the same car with a different carb and no other changes. Weber DGV with automatic choke is the best way to go when replacing a SIngle Stromberg. The auto choke version is jetted much nicer than the manual choke carb.
• MGB with Weber Dual Pr...

[@integr8er66]

The Weber Carb isn't the problem, the intake manifold is.

[@americanpatriot2422]

Great video

[@callen26]

Excellent demo of port robbing.

[@jeffhildreth9244]

Is this a function of jetting or a mismatch of the Weber 45 to a stock engine and cam.
What is the remedy other than installing the proper SUs. ?

[@integr8er66]

Change the manifold

[@charrin9086]

What was the solution?

[@peterpowder8546]

Intake manifold

[@kelvindodd5577]

Cannon Long Branch Manifold. The TWM or Derrington version with curved inlets works much better.

[@integr8er66]

Also I had good results with a Pierce manifold

[@kelvindodd5577]

@@integr8er66 Pierce bought up a lot of TWM stock, but I believe the current Pierce manifold is a short branch.

[@TheMike5232]

I'm currently tuning my dcoe on my spitfire and have found that the right barrel that feeds cylinders 1 and 3 (firing order #) cannot be adjusted by the idle adjust needle meaning that the jet that feeds those cylinders is not functioning. I switched the jets to the other sides and the problem follows the cylinders to 2 and 4. Have the jet in solvent to see if i can get contaminates out of the 45F9 jet. If not you can buy a new pair for $20.