Can someone check their manifold?

[Bambikiller240]

Originally posted by Ed

Do you guys think it is necessary to connect the hose to the intake manifold? Supposedly the coolant was to flow through the intake manifold to bring the carbs up to operating temp then the thermostat (the one on the back between the manifold and the fire wall) would close when the temp is appropriate. Now wouldn't it be better to keep the carbs cool by not allowing the water flow through the manifolds? This would keep the intake air cooler.

Many people do not have them hooked up, or they do like I'm doing where they ARE hooked up, but I've plugged the metal tubes up so water cannot flow through the manifold or the carbs EVER. But it looks Kosher from the outside in case I have to be inspected. The downside is that it takes a little longer for the carbs to heat up from a COLD start. I live in a mild climate so it doesn't affect me much at all except on really cold winter mornings and I just let the engine warm fully in the driveway before I take off to work.

[Gav240z]

Carl my water tubes through the carbs on my 240z were removed so that no water runs through them either.

It doesn't bother me however we do get cold days here in Melbourne especially in winter sometimes it's very cold and the Z takes a little while to warm up.

Of course it's better for engine life to have it warm quicker but I have always thought that having coolant run through here would also cause the car to get more chance of vapor lock in Summer?

You have to picture melbourne as being cold as ICe in winter and Hot as Hell in Summer.

Just curious about this.

[Bambikiller240]

Originally posted by Gav240z

Of course it's better for engine life to have it warm quicker but I have always thought that having coolant run through here would also cause the car to get more chance of vapor lock in Summer?

Just curious about this.

Probably not, see the water flow stops when the engine is warmed to operating temperature. The Thermo-Valve at the back of the manifold CLOSES when the water gets to a certain temp (probably same as when the regular Themostat opens). When that Valve closes there is no longer water flow through the manifold and carbs, so it shouldn't cause a problem.