What is the metal pipe through the inlet manifold REALLY for?

Tor

Well-Known Member
Hi all,

I recall reading several posts over the years about it having to do with keeping the carb tower just cool enough to prevent fuel vapour lock, and just wanted to have it confirmed once and for all. I’m having vapour lock issues with my V8 in Cape Town, which I’m preparing to sell, and my good friend who services and looks after it figures it’s just a thermostat bypass and can be deleted. He’s been in the P6 game for 50 years so I’m not trying to tell him to do something unless I know for a fact what I’m asking him. As far as I know it’s not been hacked away and may be drilled/poked clear and reconnected.

The car has a Huco sucker type pump, replumbed supply lines, a fresh carb overhaul and the radiator has been gone over.

Thanks as ever,

Tor
 
Hi, As Peter says it's for air to bleed out so coolant goes to the top of the carb tower. The heater return pipe underneath the inlet manifold would be a far easier thermostat by-pass route.

Colin
 
Hi, As Peter says it's for air to bleed out so coolant goes to the top of the carb tower. The heater return pipe underneath the inlet manifold would be a far easier thermostat by-pass route.

Colin
Hi Colin,

I understand by this that the high-mounted, small-gauge forward outlet sends coolant to the radiator. Is the larger, lower return pipe important to the temperature of the inlet manifold? This is the one that is currently bypassed on the car so that there are two hoses running under it without being attached to the manifold.

Tor
 
Hi, I wouldn't think it adds much to the temperature of the manifold, particularly if the heater is being utilised because the return will be cooler. I would presume it just makes for a neater installation, as it's only fixed to the manifold not part of it. I'm curious, why is there two hoses under the manifold?

Colin
 
I'm curious, why is there two hoses under the manifold?
Colin
Hi Colin,
Took a while before I could talk to him. I had got it wrong, the bolted-on metal pipe has been removed and the hosework that would be connected to it is rerouted away from/round the engine. The bleed nipple in the RHS carb tower is in place and plumbed to the radiator, so there are in fact no hoses under the manifold. In the end it was much a-post about nothing... [gets his coat and leaves]
 
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