Z32 Nismo Radiator Cap ?

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WildBill66 - 23 Mar 2005 07:46 GMT

Saw an ad for Nismo radiator caps, ad says Nismo cap has a higher pressure
rating than a stock cap. My cap is old and the seal is worn 1994 model
coupe.

Will these caps perform as advertised without any side effects ? I used
to own a Sidewinder jet boat with a 425 bored to 455 and it was cooled by
lake water and ran better on cooler days when water temp was lower. So a
cooler engine is always a good thing. What do you think ?

Here's the ad:

"Nismo radiator cap is a heavy duty radiator cap, which operates at 18.2
lbs (1.3 kg/cm) compared to 12.6 lbs (0.9 kg/cm) non-turbo and 16.8 lbs.
(1.2 kg/cm) turbo Nissan OE(Original Equipment) stock caps.

Made for vehicles that need more cooling than the stock radiator cap
provides.
Fits all Nissan and Infiniti vehicles manufactured from 1984 to present."

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Steve T - 25 Mar 2005 06:05 GMT

> Saw an ad for Nismo radiator caps, ad says Nismo cap has a higher pressure
> rating than a stock cap. My cap is old and the seal is worn 1994 model
[quoted text clipped - 3 lines]
> to own a Sidewinder jet boat with a 425 bored to 455 and it was cooled by
> lake water and ran better on cooler days when water temp was lower.

It ran better because the AIR was cooler/more dense not because the water
temp was lower..

> So a
> cooler engine is always a good thing. What do you think ?

That isn't true.

> Here's the ad:
>
[quoted text clipped - 4 lines]
> Made for vehicles that need more cooling than the stock radiator cap
> provides.

A higher pressure cap isn't going to cool better, just isn't going to
release as easily if the engine does get too hot.

Signature

Steve

http://www.atlantaracing.com

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WildBill66 - 25 Mar 2005 07:09 GMT

Steve,

So a higher pressure cap holds the pressure to a higher temp. Sounds like
a lower pressure cap would be better since it will blow off excess
pressure sooner. Factory engineers usually know best. Advertisements
attempt to trick us into thinking we might benefit.
Thanks.

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john smith - 25 Mar 2005 07:27 GMT

Rember that the weak link in the system is the radiator cap. If you add
that much more pressure to the system and the car is old something else
might blow. But, I have done the change like you describe on a 1987
Stanza and the cooling system has held together for two years. The old
one was shot. Now, I should mention that I have changed the waterpump,
heater core, radiator and all the hoses and the thermostat prior to the
change of the cap. My aunt owned the car and it was in need of repair
when I bought it. So, if the system is in good working order you should
have no problem.

> Saw an ad for Nismo radiator caps, ad says Nismo cap has a higher pressure
> rating than a stock cap. My cap is old and the seal is worn 1994 model
[quoted text clipped - 14 lines]
> provides.
> Fits all Nissan and Infiniti vehicles manufactured from 1984 to present."

Reply to this Message