Re: IML: Cooling system pressure

["Pete Engel" <peter.engel@xxxxxxxxxxx>]

Dan,

I read somewhere (probably in one of my automotive training course
textbooks) that pressure in the block and heads reaches 90 psi when the
thermostat is closed and engine RPMs are high.  Therefore pressure from a
municipal water system should not be a problem.

Pete in PA


From: therichardsonfamily@xxxxxxxxxxx
Subject: IML: colling system pressure?
Date: Tue, 20 Feb 2007 20:35:23 +0000
Reply-To: mailing-list@xxxxxxxxxxxxxxxx
Here's a question for Dave, but others may have some insight as well.

My '67, 440 cid (Imperial engine) has newly replaced freeze plugs, and a lot
of casting sand and junk in the cooling system.  Prior to doing a closed
system flushing with "Cascade", I want to get most of the garbage out using
a garden hose on the lower radiator hose, thereby avoiding the redone
radiator.

We all know 15-18 psi is what a radiator cap opens at.  However, my garden
hose may be as high as 25 to 30+ psi.  Can the head gaskets, etc. and inside
of the engine take that kind of pressure?  Does anyone know what pressure
exists inside the block?  Or would I be wiser (with this old , tired engine)
to just throw an old radiator on and do a closed system flush?  Any other
drawbacks to my open system flush?

Thanks for any input.

Dan Richardson
300L Family Heirloom







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