RV8 Water Flow Question

[rev-erend]

Guys,

I have a question on the water flow on my TVR SEAC.

The pictures below show the Water piping and where it goes but I have a question
on the feed pipe to the expansion tank.

Where should it feed from ... and it is even needed ?



Hot water Return to Rad and other piping


Cold Water feed from Rad bottom to Pump

[deetes]

Hope this pic helps

[rev-erend]

Can't see the pipe in question ?

Where do you think it feeds from ?

[stevieturbo]

The top picture with labels looks totally wrong

Why does the "escape" from the lower rad cap try to go into the pressurised expansion tank ?
This should go into an atmospheric overflow tank.

And it would be strange for the bottom of an expansion tank to go to the top of the radiator. Normally these enter the system via the bottom hose, or close to it. Although I guess other locations are feasible.

And shouldnt the return from the heater matrix go into the back of the water pump ?

Too difficult to see what you have going on there. Is it configured the way TVR left it, or have you totally changed everything ?

[anonymous-user]

It is important to ensure that the bottom "filler" hose of the header tank is connected to the bottom hose, or the one closest to the water pump inlet. This is so that the minimum pressure in the coolant system (set by the header tank cap rating) is applied to water pump inlet to prevent cavitation. If you apply your header tank pressure to the top hose, the pressure loss in the radiator will reduce this pressure and cause cavitation on the pump inlet. Generally the "bleed" hose goes from the top hose or top of the rad to the header tank. Although this small diameter hose effectively "short circuits" the radiator, the diameter is small to deliberately reduce this recycling flow. (the small amount of flow ensures that the system de-gasses well however)

[Steve_D]

I can see a cap on both the expansion tank and the thermostat housing.
The one on the stat should just be a plain cap without pressure relief.

The hose from the bottom of expansion should go to bottom hose.
The bleed pipes from the top of rad and from stat housing should go to the side of the expansion tank but could be tee'd together if required. As said they should be small bore.

Steve

[rev-erend]

Thanks for the advice .. always was a danger in getting it wrong

[deetes]

rev-erend said:

Can't see the pipe in question ?

Where do you think it feeds from ?

[dnb]

Not saying mine is right by any means, but I think it's trying to achieve a similar thing to Rev. I don't think mine is too far wrong. The one thing I am concerned about is that the header tank might be connected to the wrong side of the stat.



It's not totally clear from the pics, but the manifold is conventionally plumbed.

The heater matrix (connections not visible) is connected to the bottom rad hose (driver's side of the car) and to the inlet manifold connection.

The header tank bottom connection is connected to the inlet manifold, same area as the heater.

The top connection on the header tank goes to the top of the radiator to act as an air bleed. The pressure relief connection goes to the bottom of an expansion tank. It has no pressure cap and is vented to atmosphere.

Would be interesting to know if I have done it right too.