Water Pump by-pass with Weber carbs

[killysprint]

When fitting Weber carbs and manifold, should you replace the std by-pass connecting tube with a blank, with a small diameter hole drilled in it? Similar to the ones used when fitting a electric water pump?

Thanks in advance for your replies!

[dursley92]

I run twin 45s with the standard bypass setup and a standard water pump, no problems at all.

Only thing was I had to file a little off the bottom of the new manifold slightly as there was no gap at all to the top of the water pump housing!

[sprint95m]

When fitting Weber carbs and manifold, should you replace the std by-pass connecting tube with a blank, with a small diameter hole drilled in it? Similar to the ones used when fitting a electric water pump?

Thanks in advance for your replies!

No.

The bypass is of the radiator. This is only used when the thermostat is closed.
You need to have a bypass.

It is viable to replace the standard type with an external hose to act as a bypass,
I have seen photos showing such an arrangement….
you blank off the manifold and water pump cover (with core plugs) and have a hose T-ed into the
heater return (or bottom hose if you prefer).


Ian