"Keeps higher pressure inside of the cooling system and helps the coolant flow better. It has pressure capacity of 1.3kg/cm2, while the conventional cap has 0.9kg/cm2, this means the coolants boiling point can be raised by use of [this] radiator cap."

Ok, I give. I understand increasing the cooling system's pressure increases the coolant's boiling point and reduces the amount of coolant that overflows to the surge tank... but how does it help the coolant flow better?


DaveO - 2003 G35 Sedan / DP / Willow / AT / Premium / Sport
350Z Engine Cover, T-Stat & Air Duct / Stillen CAI
GG 7-Wire H-G Kit / TS ECM / E-Fans
Street Edge TC / B&M Cooler / Stillen Exhaust

 

Higher temp, less dense, easier flow.

But it also means you're overheating for whatever reason.



2004 G35C 6MT Black. Yes Honey, I promise no mods. I love it just the way it is.

 

can you show me the picture of high pressure radiator cap?

and how do you like our stillen intake
?

 

go to performancenissanparts.com

Russ

Black 6MT Coupe
Jax, FL
PS2 and Headrest Monitors Thread

 

I have this radiator cap. It looks like any other radiator cap,
except it says Nismo on it and has the rating posted as well.
See my 2003 Sedan engine pics. some of my engine bay
pics show it, but not in detail.

2003 TwBlue 5AT Sedan, sunroof,
Graphite Leather, splashguards, HKS exhaust,
14 wire Grounding kit, 350Z duct, Stillen CAI
Underbody rear diffusers, Drilled alum pedals

 

Stress on rad, hoses, head gasket!

If you allow the coolant temp to rise above 195-200F you enter the overheat protection mode where ignition advance is pulled out reducing performance.

The last thing you want is a higher pressure cap!

 

Here is a pic of my Nismo Racing radiator cap.

2003 TwBlue 5AT Sedan, sunroof,
Graphite Leather, splashguards, HKS exhaust,
14 wire Grounding kit, 350Z duct, Stillen CAI
Underbody rear diffusers, Drilled alum pedals

247722-102_0285.jpg

 

Thanks. I understand the hotter temp = less density theory. But what's the real world difference in pumping effort... seems like a long stretch to me.

If you're looking for a high pressure radiator cap I suggest you check out these links.

http://www.performancenissanparts.co...6f3f5af3e07777

http://z1auto.com/submodel.asp?model=350z&cat=engine


DaveO - 2003 G35 Sedan / DP / Willow / AT / Premium / Sport
350Z Engine Cover, T-Stat & Air Duct / Stillen CAI
GG 7-Wire H-G Kit / TS ECM / E-Fans
Street Edge TC / B&M Cooler / Stillen Exhaust <P ID="edit"><FONT class="small"><EM>Edited by DaveO on 05/06/04 07:06 PM.</EM></FONT></P>

 

Difference in density is correct. Higher temp=less dense=lower viscosity=easier flow.

But in the real world, "helps the coolant flow better" seems like a long stretch to me too.



2004 G35C 6MT Black. What Honey? I don't know where they came from. I came home and it was like that...

 

i agree with ya. I had the high pressure nismo cap and my g35 coupe ran hot changed it and now i got air in the system