water temp gauge reading hot..air pocket? - Team Camaro Tech
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post #1 of 7 (permalink) Old May 8th, 10, 03:21 PM Thread Starter
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John Doe
 
Join Date: Jan 2010
Location: MN
Posts: 186
water temp gauge reading hot..air pocket?

so i had a cheap aftermarket mechanical gauge ran to the pipe threaded hole in the cylinder head. it was between #1 and #3. it always read about 190 worked very well for me.
i decided to go with a sport comp auto meter electical gauge. i wanted to hide the wire more so i ran it to the pipe thread hole between #6 and #8.
with the cap off it reads about 230* at a standing idle for 10 mins. as soon as i put the cap on it clims to 250* and stays there.
right now i do have the heater core lines pinched off as my core has spung a leak and im waiting for a new one.

i have some questions.
is the location ive selected too far back in the coolant flow to get a cooler temp?

do i have an air pocket trapted?

is the fact that my core lines are blocked off not allowing passage restricting me?

i really dont want to run the sensor to the manifold as i have no clean way to chase a wire up there.

thanks for the help.
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post #2 of 7 (permalink) Old May 8th, 10, 03:50 PM
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David
 
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Re: water temp gauge reading hot..air pocket?

Quote:
Originally Posted by Bucknaked Racing View Post
so i had a cheap aftermarket mechanical gauge ran to the pipe threaded hole in the cylinder head. it was between #1 and #3. it always read about 190 worked very well for me.
i decided to go with a sport comp auto meter electical gauge. i wanted to hide the wire more so i ran it to the pipe thread hole between #6 and #8.
with the cap off it reads about 230* at a standing idle for 10 mins. as soon as i put the cap on it clims to 250* and stays there.
right now i do have the heater core lines pinched off as my core has spung a leak and im waiting for a new one.

i have some questions.
is the location ive selected too far back in the coolant flow to get a cooler temp?

do i have an air pocket trapted?

is the fact that my core lines are blocked off not allowing passage restricting me?

i really dont want to run the sensor to the manifold as i have no clean way to chase a wire up there.

thanks for the help.
Does the electrical gauge have an adequate ground??????

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post #3 of 7 (permalink) Old May 8th, 10, 04:27 PM Thread Starter
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John Doe
 
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Re: water temp gauge reading hot..air pocket?

david,
yes it has the same groud as my other gauges which are working just fine.
i sat and watched the temp rise to 230 hold then spike once i locked the cap on. it was moving slowly so the ground should be fine.
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post #4 of 7 (permalink) Old May 8th, 10, 05:28 PM
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Patrick
 
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Re: water temp gauge reading hot..air pocket?

I am running 2 temp guages in my truck that has a 400 engine. The one between 1&2 reads 180*. The one between 6&8 reads 210* and both gauges have been swapped and are reading accurate.

When I first built this engine I was having problems with it boiling over. After searching I found that it was only the pass side that was overheating. I drilled the rear of the intake on the passenger side and did the "bypass" trick running a 3/8 hose to the water pump. Before this mod, the pass side was getting up to 260*. Now I have some extra flow on that side and it helped it equal out the temps.

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post #5 of 7 (permalink) Old May 8th, 10, 10:12 PM Thread Starter
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John Doe
 
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Re: water temp gauge reading hot..air pocket?

i never thought the 2 sides would run that far apart. i have never had a over heating problem in the past nor now. i was ready for it to boil over but i didnt even get any coolant in the over flow.

my rpm air gap intake does already have the ports in the rear of the intake. i may look into that but i dont know if i have the room for more hoses.
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post #6 of 7 (permalink) Old May 9th, 10, 01:40 AM
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Steiner
 
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Re: water temp gauge reading hot..air pocket?

Quote:
Originally Posted by Bucknaked Racing View Post
i never thought the 2 sides would run that far apart. i have never had a over heating problem in the past nor now. i was ready for it to boil over but i didnt even get any coolant in the over flow.

my rpm air gap intake does already have the ports in the rear of the intake. i may look into that but i dont know if i have the room for more hoses.

My AutoMeter mechanical gauge in the head between cylinders 1 and 3 reads almost 20 degrees higher than the temp sensor for my EFI which is installed in the front boss of the intake (RPM Air Gap).

Those back ports on the Air Gap are a dead head so I didn't want to run anything in them since flow would probably be poor.

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post #7 of 7 (permalink) Old May 9th, 10, 08:01 AM
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Re: water temp gauge reading hot..air pocket?

Also, the new sending unit should not be adapted in the head. The more adapters used, the further away the sending unit is from the coolant, the hotter it will read, its reading head temperature rather than coolant temp.

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