i was talking to a guy who had a 300zx thats modded a far bit he had removed the rad over flow bottle and just had the pipe running to the ground . the rad is ment to send the water from the rad to the bottle if it gets to hot and suck it back if needed but the rad cap is a one way valve when the water is hot it can push water into the bottle cus the water can push the valve upon and push water thro it but its one way so the water never get sucked back so he removed it to let the intercooler flow better does this sound rite ? as its not a header tank is it llike in a normal car

ok .. the water doesn't get sucked back in to Rad .. the water in the bottle is to stop Air being let in to the rad when the rad cap opens to release Built up pressure

but if u have a decent rad cap or uprated one it shouldn't happen anyways

 

i'v been running with out overflow for some time not had any problems at all

ok .. the water doesn't get sucked back in to Rad .. the water in the bottle is to stop Air being let in to the rad when the rad cap opens to release Built up pressure

but if u have a decent rad cap or uprated one it shouldn't happen anyways

 

i'v been running with out overflow for some time not had any problems at all

 

do you think it is ok to just run the pipe to the ground? i would like to remove it to let the intercooler flow better and remove wash bottle to other side . would i be best then just running the pipe in to a small bottle some were out the way were is your overflow now

i was talking to a guy who had a 300zx thats modded a far bit he had removed the rad over flow bottle and just had the pipe running to the ground . the rad is ment to send the water from the rad to the bottle if it gets to hot and suck it back if needed but the rad cap is a one way valve when the water is hot it can push water into the bottle cus the water can push the valve upon and push water thro it but its one way so the water never get sucked back so he removed it to let the intercooler flow better does this sound rite ? as its not a header tank is it llike in a normal car

Correct. Its just an overflow bottle NOT a header tank

More uneccessary junk that can be deleted.

If you are using the car in some form of motorsport then you need some sort of catch tank but for normal road use an open pipe to the chassis will do

do you think it is ok to just run the pipe to the ground? i would like to remove it to let the intercooler flow better and remove wash bottle to other side . would i be best then just running the pipe in to a small bottle some were out the way were is your overflow now

 

sorry i red that wrong so you are just venting the pipe to the ground to

Correct. Its just an overflow bottle NOT a header tank

More uneccessary junk that can be deleted.

If you are using the car in some form of motorsport then you need some sort of catch tank but for normal road use an open pipe to the chassis will do

 

cool man will get rid wheni uprate the intercools god there is some rubish fitted to this car its unreal never had a car with so many bits you can get rid of

Hmmm not sure on this chaps...i was always under the absumption it was syphonic, when the system cools and creates vacume in the rad then slowly "sucks" coolant back in from the bottle otherwise water level would not be needed and there would not be a marker stick with the yellow cap. Plus iff the rad kept overflowing only it would soon be empty..

Edited August 9, 201312 yr by znut

Hmmm not sure on this chaps...i was always under the absumption it was syphonic, when the system cools and creates vacume in the rad then slowly "sucks" coolant back in from the bottle otherwise water level would not be needed and there would not be a marker stick with the yellow cap. Plus iff the rad kept overflowing only it would soon be empty..

 

I dont think it is mate, the rad caps at full extension ( when under the temp limit) it blocks the pipe off and wont extend anymore under a vacuum.

IMHO its only an overflow.

Same as Marky.......

 

Been running mine without the expansion tank for over 2 years now with no problems. MHO...... bin it for the AM IC's

 

Alz.

Same as Marky.......

 

Been running mine without the expansion tank for over 2 years now with no problems. MHO...... bin it for the AM IC's

 

Alz.

 

its like a solid wall rite next to intercooler got to be slowing all flow thro it

Hmmm not sure on this chaps...i was always under the absumption it was syphonic, when the system cools and creates vacume in the rad then slowly "sucks" coolant back in from the bottle otherwise water level would not be needed and there would not be a marker stick with the yellow cap. Plus iff the rad kept overflowing only it would soon be empty..

 

 

Your quite correct there, without an expansion tank any water that exits via the rad over flow will not be recovered later and could effectively loose a considerable amount of water over time.

 

Jeff TT

Hmmm not sure on this chaps...i was always under the absumption it was syphonic, when the system cools and creates vacume in the rad then slowly "sucks" coolant back in from the bottle otherwise water level would not be needed and there would not be a marker stick with the yellow cap. Plus iff the rad kept overflowing only it would soon be empty..

Plus one!-gets sucked back from the bottle when cooled down.:wink:

how does it suck the water back when the valve opens then the pressure rises in the rad how does it go back thro the valve ?

there is another valve in the middle of the main cap valve/seal...........

This explains better.........

http://icemancooling.com/2011/01/14/radiator-caps/

there is another valve in the middle of the main cap valve/seal...........

 

so the valves to way then

Ams do a header tank that neatly sits next to the battery if your so inclined.

This explains better.........

http://icemancooling.com/2011/01/14/radiator-caps/

 

i see now. may be i will run a smalll bottle then after all

I ran without the overflow bottle for a while and kept losing water, i put it back and stopped losing water, so that may tell you something lol, along with the similar advice to keep it above.

Hmmm not sure on this chaps...i was always under the absumption it was syphonic, when the system cools and creates vacume in the rad then slowly "sucks" coolant back in from the bottle otherwise water level would not be needed and there would not be a marker stick with the yellow cap. Plus iff the rad kept overflowing only it would soon be empty..

 

Your quite correct there, without an expansion tank any water that exits via the rad over flow will not be recovered later and could effectively loose a considerable amount of water over time.

 

Jeff TT

 

Plus one!-gets sucked back from the bottle when cooled down.:wink:

 

Have to agree there......

 

.....during my issues with the electric fan not working properly (until Jeff fixed it a few weeks back) I was keeping an eye on the water level after getting stuck in traffic in high ambient temperatures. One hot day, after sitting in traffic coming out of London, I let it rest for an hour and opened the rad cap to check the coolant and it appeared there was none in there. But the expansion tank was reading much higher on the dipstick.... So I left it, and re-checked the radiator the next morning after and to my surprise, the radiator was full once more when I removed the cap on a cold engine.

 

I could not understand how it was somehow "sucked" back in either - as I believed the rad cap to be just a one-way valve. It seems not and the above comments are correct!!

 

Richard:cool2:

This explains better.........

http://icemancooling.com/2011/01/14/radiator-caps/

 

Sure does Daz - have some rep mate!!

 

Richard:cool2:

i just want to remove it its blocking the flow of the inter cooler i will jst fit a smaller bottle some were else then

I dont see how it blocks the flow of the inter cooler, the air comes in at the front and into the pipe, not straight past it, surely Nissan, when designing the system would have dealt with it had it been a problem.

I dont see how it blocks the flow of the inter cooler, the air comes in at the front and into the pipe, not straight past it, surely Nissan, when designing the system would have dealt with it had it been a problem.

 

Air travels through the intercoolers. If there's obstructions in front OR behind this will affect flow.

 

I'm another one that binned off the overflow tank in the name of better intercooler flow, along with a repositioned washer bottle, removed carbon canister and all that crap, and vented arch liners which all add up to better flow :)

Air travels through the intercoolers. If there's obstructions in front OR behind this will affect flow.

 

I'm another one that binned off the overflow tank in the name of better intercooler flow, along with a repositioned washer bottle, removed carbon canister and all that crap, and vented arch liners which all add up to better flow :)

 

this is what i want to do to

Just do it ...