Race Car Tech Discuss anything related to road racing and auto X.

25PSI radiator cap, any reason why not?

Old 10-06-05, 04:35 PM
  #1  
Mad Man

Thread Starter
 
Carl Byck's Avatar
 
Join Date: Jan 2002
Location: Big Island Hawaii
Posts: 2,758
Likes: 0
Received 0 Likes on 0 Posts
25PSI radiator cap, any reason why not?

an I run a 25PSI cap? I am concearned about the O Rings, or anything else that may not have occurred to me. Thanks, Carl
Carl Byck is offline  
Old 10-06-05, 04:45 PM
  #2  
Kim
OBEY YOUR MAZDA
 
Kim's Avatar
 
Join Date: Oct 2002
Location: Denmark
Posts: 3,059
Likes: 0
Received 0 Likes on 0 Posts
copy / paste from Mazdamotorsports.com:

Pressure
Increasing the cooling system pressure by changing the cap will raise the boiling point of the fluid and will also keep the fluid from being expelled into the overflow tank. We recommend use of a radiator cap with a pressure rating no higher than 17-18 lbs.
Kim is offline  
Old 10-06-05, 07:04 PM
  #3  
Hobby or mental illness?
10 Year Member
 
RoadRaceJosh's Avatar
 
Join Date: Sep 2004
Location: SW Washington
Posts: 478
Likes: 0
Received 0 Likes on 0 Posts
Carl,

Have you considered the Evans coolant? Pineapple Racing swears by the stuff. A friend of mine that races an American Sedan Mustang cured his overheating with the stuff.
RoadRaceJosh is offline  
Old 10-06-05, 08:49 PM
  #4  
Kim
OBEY YOUR MAZDA
 
Kim's Avatar
 
Join Date: Oct 2002
Location: Denmark
Posts: 3,059
Likes: 0
Received 0 Likes on 0 Posts
Water wetter works well too.
I assume that you have made some kind of ducting for the radiator?, because that nice huge IC seems to take all the air.
Kim is offline  
Old 10-07-05, 01:31 AM
  #5  
Mad Man

Thread Starter
 
Carl Byck's Avatar
 
Join Date: Jan 2002
Location: Big Island Hawaii
Posts: 2,758
Likes: 0
Received 0 Likes on 0 Posts
I can run at 450-480rwhp for 20 minute boosting about 60 % of the time, Occasionally(once) I overwhelm the 16lb cap, and all my coolant is expelled in about two minutes. I have replaced it with a 21-25lb cap for now, and sealed the system. about 1/3 of the frontal air is directed around the IC and into the radiator, and oil coolers. Carl
Carl Byck is offline  
Old 10-07-05, 08:38 AM
  #6  
Lives on the Forum
15 Year Member
 
DamonB's Avatar
 
Join Date: Feb 2001
Location: Dallas
Posts: 9,617
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Carl Byck
Occasionally(once) I overwhelm the 16lb cap, and all my coolant is expelled in about two minutes.l
What temp was the coolant at when this happened?
DamonB is offline  
Old 10-07-05, 12:10 PM
  #7  
Blood, Sweat and Rotors
iTrader: (1)
 
DriveFast7's Avatar
 
Join Date: Aug 2001
Location: California
Posts: 3,733
Received 0 Likes on 0 Posts
I use a STANT high pressure cap on my HOWE aluminum radiator. 9600rpm 12a J-Bridge I think it's 25-29psi. NO coolant overheating probs. On cold days it'll run 140*F and I have to put duct tape in front of the radiator. On a typical summer @ Buttonwillow, it'll do 200-220*F.
DriveFast7 is offline  
Old 10-08-05, 05:23 AM
  #8  
www.lms-efi.com
iTrader: (27)
 
C. Ludwig's Avatar
 
Join Date: Mar 2001
Location: Floyds Knobs. IN
Posts: 5,106
Received 30 Likes on 23 Posts
I use 22lb cap on the ITS car. Never had a problem. If a couple hundred psi of combustion pressure isn't blowing the seal out I doubt the pressurized coolant will blow it in. Hell, with the amount of boost I'd guess you're running you're probably break even in the intake area.
C. Ludwig is offline  

Thread Tools
Search this Thread
Quick Reply: 25PSI radiator cap, any reason why not?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: