Questions about caps
#1
Shelby Tuner & FC badass
Thread Starter
Join Date: Apr 2002
Location: Seminole, Florida
Posts: 1,101
Likes: 0
Received 0 Likes
on
0 Posts
Questions about caps
What is the normal pressure of the stock radiator caps?
1 bar= 14.7 psi
.9 bar = 13 psi
Is it better to get a higher pressure or lower?
1 bar= 14.7 psi
.9 bar = 13 psi
Is it better to get a higher pressure or lower?
#2
RX-7 Bad Ass
iTrader: (55)
Yeah, it's somewhere around there stock. Higher pressure will increase the boiling point of the system.
Dale
Dale
#3
Shelby Tuner & FC badass
Thread Starter
Join Date: Apr 2002
Location: Seminole, Florida
Posts: 1,101
Likes: 0
Received 0 Likes
on
0 Posts
So if you wanted a colder engine, you would go lower pressure?
Any benefits besides being colder?
What about causing more wear on the internals?
Any benefits besides being colder?
What about causing more wear on the internals?
#4
Senior Member
Join Date: Apr 2001
Location: Long Beach, CA, USA
Posts: 265
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by GLHS
So if you wanted a colder engine, you would go lower pressure?
Any benefits besides being colder?
What about causing more wear on the internals?
So if you wanted a colder engine, you would go lower pressure?
Any benefits besides being colder?
What about causing more wear on the internals?
Rob
#5
Shelby Tuner & FC badass
Thread Starter
Join Date: Apr 2002
Location: Seminole, Florida
Posts: 1,101
Likes: 0
Received 0 Likes
on
0 Posts
You mean it changes the amount of pressure required to release the pressure?
How can you not change the temp of the engine, by changin the temp of the coolant, or when it boils?
Doesn't make sense to me, please explain.
How can you not change the temp of the engine, by changin the temp of the coolant, or when it boils?
Doesn't make sense to me, please explain.
#6
Senior Member
Join Date: Apr 2001
Location: Long Beach, CA, USA
Posts: 265
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by GLHS
You mean it changes the amount of pressure required to release the pressure?
How can you not change the temp of the engine, by changin the temp of the coolant, or when it boils?
Doesn't make sense to me, please explain.
You mean it changes the amount of pressure required to release the pressure?
How can you not change the temp of the engine, by changin the temp of the coolant, or when it boils?
Doesn't make sense to me, please explain.
Rob
Trending Topics
#10
Senior Member
Join Date: Apr 2001
Location: Long Beach, CA, USA
Posts: 265
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by seventhgear
but wouldnt u want it to blow the coolant out b4 it gets so hot? ok im confused sorry
but wouldnt u want it to blow the coolant out b4 it gets so hot? ok im confused sorry
Rob
#12
No longer cares
Join Date: Apr 2002
Location: just a bit north of your business
Posts: 1,345
Likes: 0
Received 0 Likes
on
0 Posts
Keeping the system pressure up prevents cavitation caused by air pockets in the water jacket. When a bubble forms on the surface of the water jacket it prevents the heat transfer and acts as an insulator causing the engine to retain more heat, rather than transfer it to the coolant.
What has been said about the radiator cap pressure rating is correct for the most part. Cooling systems are engineered to operate at a certain pressure rating. Increasing that pressure could exceed the rating of other parts/seals in the system causing failure. Although I doubt going up to 15lbs would cause this to happen in our engines.
What has been said about the radiator cap pressure rating is correct for the most part. Cooling systems are engineered to operate at a certain pressure rating. Increasing that pressure could exceed the rating of other parts/seals in the system causing failure. Although I doubt going up to 15lbs would cause this to happen in our engines.
#13
Lives on the Forum
As a rule of thumb, keep the caps under 20psi for stock cooling systems.  Anything over 20psi would cause leaks and possible bursting with stock components - you need to run a "race" cooling system with more robust components to run this high of a cooling system pressure.
BTW, 1 bar = 14.5psi.
Caps up to 1.2psi is fine on the street.
-Ted
BTW, 1 bar = 14.5psi.
Caps up to 1.2psi is fine on the street.
-Ted
Thread
Thread Starter
Forum
Replies
Last Post
Nosferatu
2nd Generation Specific (1986-1992)
7
09-05-15 02:13 PM