Old School Or New?

[Guest richharry09]

Just bought a 2B last week and having some serious problems balancing the twin webers on the 1.8 engine, also getting petrol pissing out of the trumpets (pretty dangerous at the level its coming out!)

 

So do you keep the twins and have that lovely old sound and probably lots of fairly unreliable days having to tweak, coupled with poor fuel return on mileage and low rev rumbling.....

 

or just stick some injectors on the engine and be done with it?????

 

Sounds stupid but this is consuming me!

[Andi]

Or bike carbs

[Guest RichardO]

Or check fuel pressure, buy a couple of service kits, check/set the float levels, and balance them with a carb balancer (or rubber pipe).

 

I've just had the same problem after 5,000 miles (carbs untouched in that time). 1 hour later all sorted.

 

Rich...

[Guest richharry09]

Or check fuel pressure, buy a couple of service kits, check/set the float levels, and balance them with a carb balancer (or rubber pipe).

 

I've just had the same problem after 5,000 miles (carbs untouched in that time). 1 hour later all sorted.

 

Rich...

Thanks for that - just spoke to a carb specialist in Reading who suggested the same so will try and resolve that way. How can I check the fuel pressure though?

[miikae]

One of These will do the job. You are looking for 2-2.5 psi fuel pressure. HTH

 

Mike

[miikae]

The first thing i would want to know is were the carbs jetted correctly for the engine they are now fitted to and not just slapped on after being bought cheap that where possibly previously fitted to a unknown engine.

Ask the previous owner for this information to start with.

If it has been running ok previously then a tune up should get you sorted as its no big mystery to tune them yourself a long as you do things in the right order, if in doubt get yourself the How to build & power tune Webber & Dellorto Carburettors by Des Hammill , Burtons sell them i think. HTH

 

Mike

[chris n]

Hi Richard,

I have twin Webers 40s fitted to a 2.0ltr Pinto in my S7. I'm running a standerd fuel pump.

Fuel supply pressure needs to be between 1.5 - 2.5 psi and at least 1.5psi under full throttle.

If the fuel supply pressure is to low the level in the float bowls will drop making a lean mixture, the opposite will happen if the pressure is to high the float bowls will flood and you end up with your problem (fuel pouring out of the carbs).

 

I would start by checking the carbs are jetted right, they should be-

 

Jetting for Weber 40 DCOEs on standard Pinto 1600, 1800 & 2000

 

34 mm chokes

F11 emulsion tubes

135 main jets

35 accelerator jets

190 air correctors

40 F9 idle jets

4.5 auxiliary venturis

Float level shut off height - 7.5 mm

Float height at droop (FULL) - 15.0mm

Idle screw turned out 7/8 of a turn

 

to balance the carbs I use Gunson Carbalancer.

 

HTH