pressure in radiator when vehicle has not been run

Old 04-25-2011, 03:22 PM
  #1  
jason74
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Jan 2006
Posts: 1
Default pressure in radiator when vehicle has not been run

I have a 406 chevy small block with a 350 turbo trans in a 1986 elcamino SS. I drag race in the 1/4 mile runs 11.70. I am having a problem with my radiator building pressure and going back into the recovery jug. I have no water in my oil, no water in the cylinders. I have flushed the radiator and put only water back in it and it has not changed anything. I have changed the radiator cap and still no luck. I can leave it sit after letting the pressure out and it will build it right back even if it has not been ran. CONFUSED PLEASE HELP!!!!!
jason74 is offline  
Old 04-26-2011, 02:55 AM
  #2  
TopspeedLowet
Senior Member
DYNO OPERATOR
 
Join Date: Apr 2008
Posts: 504
Default Air pocket in head?

The pressure you are getting is likely an air pocket in the head that was there when you shut down the engine and is trying to get to the radiator or where ever your cap is. You may have a poorly designed system that is putting air in because it is not completely full when running or you never got all the air out when you filled it this spring. You could also be running high temperatures and boiling the straight water mixture if you have a thermostat in it allowing 212 operating temps. To get air out of the block if that is the problem, jack the car up in front to make the cap the high point and turn on your pump if it is electric. If it is belt driven you have to start the car. I hope this helps you solve or find problem.
Bruce
TopspeedLowet is offline  
Old 04-26-2011, 04:11 AM
  #3  
fast75vega
Senior Member
RACING JUNKIE
 
Join Date: Nov 2008
Location: Niagara Falls, NY
Posts: 965
Default Re: Air pocket in head?

Originally Posted by TopspeedLowet
The pressure you are getting is likely an air pocket in the head that was there when you shut down the engine and is trying to get to the radiator or where ever your cap is. You may have a poorly designed system that is putting air in because it is not completely full when running or you never got all the air out when you filled it this spring. You could also be running high temperatures and boiling the straight water mixture if you have a thermostat in it allowing 212 operating temps. To get air out of the block if that is the problem, jack the car up in front to make the cap the high point and turn on your pump if it is electric. If it is belt driven you have to start the car. I hope this helps you solve or find problem.
Bruce
X2 :wink:
fast75vega is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -