This may be old information to you, but are you running 2/3 to 3/4 water as
coolant? Too much antifreeze impairs cooling. I found this out the hard way
years ago. Use about 1/3 antifreeze and use Redline in your cooling system.
You will gain maybe 10 or 15 degrees reduction in temperature.
Also, you can take your car to a smog shop and they can put the sniffer in
the coolant with the car running and you can see if you've got a cracked
head or block or bad head gasket. Exhaust gasses in the coolant will cause
terrible overheating.
Don Scott
At 11:41 PM 6/25/99 -0700, you wrote:
>Just installed my rebuilt XPAG engine and am having problems keeping it
>cool. Engine rebuild included cylinder resleeving, new bearings, new
>3/4 race camshaft, new valves including valve guides and hardened
>seats. Above work was done by a local machine shop and I assembled the
>major parts and installed the engine.
>
>Symptoms: Engine starts and runs fine for first five miles then
>temperature continues to increase until coolant boils (gauge reads 185 C
>but doubt its accuracy as coolant should be good to about 265F. It
>appears to me that the engine is putting out more heat than the cooling
>system can absorb.
>
>The water pump appeared normal on installation.
>
>The radiator was tested and cleaned by a local radiator shop with no
>discrepancies noted.
>
>Thermostat was tested and opened normally. I then cut out the center
>part of the thermostat and reinstalled just the ring. This helped by
>slowing the rate of temperature rise but end result was still the same.
>
>Any ideas on what could be causing this? Could it be from all the new
>parts, the camshaft etc.? I am just driving it short distances until
>this gets resolved. Total miles on the rebuild now is about 65.
>
>Incidentally air temperatures have been in the 90's the last couple
>weeks.
>
>Bob Peck
>
>
>
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