Re: MGB Performance with Single Weber Carb.


OK here's my 2 cents, if the motor is in good shape, a down draft weber can be tuned to run well, but remember it's a progressive carb, meaning one barrel is open and one opens at 60-70% of throttle, it's not a performance carb. It's a good all around driving carb. Good mpg. The problem is when the motor is starting to wear or something else is not right the Weber is not forgiving and will run like shit.

Su carbs are more forgiving when a motor starts to wear, and when properly turned run better then the Weber for spirited driving. But the SU must be looked after, like check dash pot oil, if you drive in cold weather then a minor adjustment should be done in fall, and again in the spring.

If given a choice, I would install SUs, but if no choice I can turn Weber's, but if your motor is worn out I won't waste your time or mine. If your running a 75 or later B with its stock motor with over 55 k miles on it, then putting on a Weber is a waste of money and time, due to cam failure. Most MGBs with over 65k suffer from head gasket and cam failure of some degree.

So there's my 2 cents

George Van Horn
USN            Ret.
USS Virginia CGN-28
USS Wainwright CG-28
USS Monterey CG-61
USS Ross DDG-71

On Monday, March 6, 2017 searlerb <Philly_MG_Club@...> wrote:


Thanks Gordon.

-----Original Message-----
From: Gordon Todd gltodd@... [Philly_MG_Club] <Philly_MG_Club@...>
To: Philly_MG_Club <Philly_MG_Club@...>
Sent: Mon, Mar 6, 2017 7:18 am
Subject: Re: [Philly_MG_Club] MGB Performance with Single Weber Carb.

My midget has a side draft weber.
It ran lousy until George Van Horn set it up properly.
The problem as I understand it, is that webers are primarily for racing and operate best at high revs.
George installed a smaller intake venturi  (not sure this is the right word) and a couple other adjustment.
It now runs great.
-----Original Message-----
From: Steve Harding mgbgt1@... [Philly_MG_Club] <Philly_MG_Club@...>
To: Philly_MG_Club <Philly_MG_Club@...>
Sent: Sat, Mar 4, 2017 10:13 pm
Subject: [Philly_MG_Club] MGB Performance with Single Weber Carb.

Contact George Van Horn. He has years of knowledge tuning MGBs. 

On Mar 4, 2017, at 8:42 PM, Dave Carpenter slowstdy@... [Philly_MG_Club] <Philly_MG_Club@...> wrote:


On Mar 4, 2017, at 8:29 PM, 'Gerard D'Angelo' Gdangelo6118@... [Philly_MG_Club] <Philly_MG_Club@...> wrote:

Webers Suck......Get your hands on Dual SU HIF's, They were what the home market (England) GT's had installed.....You can score a set on E-bay
People don't know how to tune them so they install Webers.......Contact Joe Curto in Astoria Queens NY......He is the Local SU Expert, and can assist you on rebuilding them.......................just my thoughts...........Gerard🚁 

On Sat, Mar 4, 2017 at 10:24 AM, searlerb@... [Philly_MG_Club] <Philly_MG_Club@...> wrote:

I'm looking at a nice 1971 MGB GT.  It has a single Weber.  Does anyone have experience with the car performance with this especially compared to alternatives like dual SUs?



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