Any reason not to install a header tank?

[Rivers & creeks]

I don't think it can be a pressurised cap, otherwise how does air get back in when the expansion of the coolant has pushed out the excess I had filled it with? No sign of excessive coolant use, the engine oil is so clear it's hard to tell the level on the dipstick, so no emulsification. Foxs did two warm oil changes, a flush and then another oil change to thoroughly clean the engine, hence the clear oil. It's only been run for about 20 hours since mind you. There's no smoke after the engine is warm. There's an oily film in the coolant but nothing to explain that. The heat exchanger was chemically cleaned and twice flushed but that doesn't clean all the pipe work from and to the engine. The engine takes about 15 minutes to get to working temperature and stays there at 74 degrees rock solid, the dial barely twitched from 74 on one 5 hour motor so I'm sure I have just been overfilling it. Just wish there wasn't the nag of that oily water.

 

[sailorman]

I don't think it can be a pressurised cap, otherwise how does air get back in when the expansion of the coolant has pushed out the excess I had filled it with? No sign of excessive coolant use, the engine oil is so clear it's hard to tell the level on the dipstick, so no emulsification. Foxs did two warm oil changes, a flush and then another oil change to thoroughly clean the engine, hence the clear oil. It's only been run for about 20 hours since mind you. There's no smoke after the engine is warm. There's an oily film in the coolant but nothing to explain that. The heat exchanger was chemically cleaned and twice flushed but that doesn't clean all the pipe work from and to the engine. The engine takes about 15 minutes to get to working temperature and stays there at 74 degrees rock solid, the dial barely twitched from 74 on one 5 hour motor so I'm sure I have just been overfilling it. Just wish there wasn't the nag of that oily water.

if the cap isnt of the pressure type, how does it allow coolant to escape

 

[Rivers & creeks]

The little copper pipe underneath it - as described in the original post - keep up at the back

 

[sailorman]

The little copper pipe underneath it - as described in the original post - keep up at the back

how does the water get past the cap into "The Little pipe" any of you front runners know

 

[Rivers & creeks]

It's underneath it, the water comes up and out of the pipe, I think the cap is just there as a filling point.

 

[sailorman]

It's underneath it, the water comes up and out of the pipe, I think the cap is just there as a filling point.

http://auto.howstuffworks.com/cooling-system7.htm

 

[scottie]

It's underneath it, the water comes up and out of the pipe, I think the cap is just there as a filling point.

The cap lifts under pressure and allows the coolant to run out the overflow.

 

[pappaecho]

I would have thought that a visit to a car scrapyard should yield a suitable suspect