572 Running hot or just the gauge? - Team Camaro Tech
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post #1 of 110 (permalink) Old Jul 15th, 19, 04:27 AM Thread Starter
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572 Running hot or just the gauge?

So here is the deal. Finally got the car back together for the 5th or 6th time now chasing coolant and oil leak issues - hoping the end is in sight soon as this is getting very tiring. Anyway, took a test ride yesterday. Was around 91 degrees out so it was a hot day. Driving at normal speeds car was running around 195. At a stop light 210. Driving again would eventually get down to around 200ish. Stop light again just the width of the needle over 210. Being it is an electric gauge, I shot it with a $20 laser temp gun to double check. Everywhere I shot I couldn't anything close to 210 unless it was on the head down my the headers. Headers read 230 at the highest temp but they are a polished coating too. Took readings on the top of the rad(polished alum so I figured not accurate)150, Thermostat(polished again)155, under the housing 185, heater hose fitting in top of manifold 185, temp sender in manifold 185. Front of heads 195........Question is where exactly is the best place to get the most accurate temp? I am 90% convinced my gauge is wrong, but need confirmation.

'68 Camaro with RS conversion
Moser 9" with 4:11
Martz Chassis 4-link and Front Sub-frame
Tremec T-56 Magnum 6 speed
572 BB - CM Engines
Wilwood 6 piston front and 4 piston rear disc
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post #2 of 110 (permalink) Old Jul 15th, 19, 04:52 AM
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Re: 572 Running hot or just the gauge?

What temperature thermostat are you running? I always run a 160 thermostat in my engines.

https://www.jegs.com/webapp/wcs/stor...rsistYmm=false
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post #3 of 110 (permalink) Old Jul 15th, 19, 08:13 AM
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Re: 572 Running hot or just the gauge?

Is the gauge mechanical? If so remove it take it into the kitchen a plop it in a pot of water. Heat water on stove and watch temp where your water starts to boil. Correct for altitude if desired.

If you have an electric gauge the test is the same but you need a batery and wires to power the sender and provide a ground path.

Big Dave
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post #4 of 110 (permalink) Old Jul 15th, 19, 08:21 AM
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Re: 572 Running hot or just the gauge?

A 160 degree thermostat is not going to help a car running at 210....

Don
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post #5 of 110 (permalink) Old Jul 15th, 19, 10:55 AM Thread Starter
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Re: 572 Running hot or just the gauge?

Quote:
Originally Posted by ZEN357 View Post
What temperature thermostat are you running? I always run a 160 thermostat in my engines.

https://www.jegs.com/webapp/wcs/stor...rsistYmm=false
I have a Robert Shaw 160 degree with (3) 3/16" holes as directed by Vintage Air(Front Runner system) and Stewart Components for my stage 4 water pump. Also has the bi-pass hose hooked up.

'68 Camaro with RS conversion
Moser 9" with 4:11
Martz Chassis 4-link and Front Sub-frame
Tremec T-56 Magnum 6 speed
572 BB - CM Engines
Wilwood 6 piston front and 4 piston rear disc
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post #6 of 110 (permalink) Old Jul 16th, 19, 05:07 AM
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Ed
 
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Re: 572 Running hot or just the gauge?

Quote:
Originally Posted by ZEN357 View Post
What temperature thermostat are you running? I always run a 160 thermostat in my engines.

https://www.jegs.com/webapp/wcs/stor...rsistYmm=false

I have a Robert Shaw 160 degree with (3) 3/16" holes as directed by Vintage Air(Front Runner system) and Stewart Components for my stage 4 water pump. Also has the bi-pass hose hooked up.

What kind of coolant mix are you running?
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post #7 of 110 (permalink) Old Jul 16th, 19, 09:04 AM Thread Starter
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Re: 572 Running hot or just the gauge?

Quote:
Originally Posted by ZEN357 View Post
Quote:

Originally Posted by ZEN357 View Post

What temperature thermostat are you running? I always run a 160 thermostat in my engines.



https://www.jegs.com/webapp/wcs/stor...rsistYmm=false



I have a Robert Shaw 160 degree with (3) 3/16" holes as directed by Vintage Air(Front Runner system) and Stewart Components for my stage 4 water pump. Also has the bi-pass hose hooked up.



What kind of coolant mix are you running?
Napa 50/50 green pre-mix

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'68 Camaro with RS conversion
Moser 9" with 4:11
Martz Chassis 4-link and Front Sub-frame
Tremec T-56 Magnum 6 speed
572 BB - CM Engines
Wilwood 6 piston front and 4 piston rear disc
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post #8 of 110 (permalink) Old Jul 16th, 19, 10:32 AM
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Re: 572 Running hot or just the gauge?

Greg, I would say your gauge is off. If you can remove the sender without too much
trouble do so and set it in a cup of hot water of know temp (use cooking thermometer).
Compare the readings. If you want to warm the engine up with the radiator cap off you
could do the same thing testing the temp of the coolant in the radiator with a cooking
thermometer.

Al

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post #9 of 110 (permalink) Old Jul 16th, 19, 12:12 PM Thread Starter
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Re: 572 Running hot or just the gauge?

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Originally Posted by allanjs View Post
Greg, I would say your gauge is off. If you can remove the sender without too much

trouble do so and set it in a cup of hot water of know temp (use cooking thermometer).

Compare the readings. If you want to warm the engine up with the radiator cap off you

could do the same thing testing the temp of the coolant in the radiator with a cooking

thermometer.
Thanks. Definitely will do that. Also have a 2nd reference as well from Autometer which does not sound entirely too accurate but want to compare for the heck of it just to see.
From Autometer tech:
Using ohm meter with black on the brass sender housing and red on the signal side
220"=105 ohms
210/123
190/175
170/253
All ohms +/- 9 which is a huge grey area


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'68 Camaro with RS conversion
Moser 9" with 4:11
Martz Chassis 4-link and Front Sub-frame
Tremec T-56 Magnum 6 speed
572 BB - CM Engines
Wilwood 6 piston front and 4 piston rear disc
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post #10 of 110 (permalink) Old Jul 16th, 19, 02:16 PM
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Re: 572 Running hot or just the gauge?

Quote:
Originally Posted by pittpens24 View Post
Thanks. Definitely will do that. Also have a 2nd reference as well from Autometer which does not sound entirely too accurate but want to compare for the heck of it just to see.
From Autometer tech:
Using ohm meter with black on the brass sender housing and red on the signal side
220"=105 ohms
210/123
190/175
170/253
All ohms +/- 9 which is a huge grey area


Sent from my SM-G973U1 using Tapatalk
Those data points from Autometer should be fine. The +/- 9 ohms is not exactly a huge grey area when you see that 10 degrees is around 20 ohms. You are claiming the gauge is off by 40 or 50 degrees which would be 125 ohms or so...

Iím going to go out on a limb and say your car is running hot due to an inadequate radiator, fan or shroud etc. That 572 likely gets lousy gas mileage which means it produces a ton of heat....

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
1969 Mustang Sportsroof project
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post #11 of 110 (permalink) Old Jul 16th, 19, 02:42 PM Thread Starter
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Re: 572 Running hot or just the gauge?

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Originally Posted by dhutton View Post
Those data points from Autometer should be fine. The +/- 9 ohms is not exactly a huge grey area when you see that 10 degrees is around 20 ohms. You are claiming the gauge is off by 40 or 50 degrees which would be 125 ohms or so...



Iím going to go out on a limb and say your car is running hot due to an inadequate radiator, fan or shroud etc. That 572 likely gets lousy gas mileage which means it produces a ton of heat....



Don
Don I hope you are way off base there. If my gauge is right my next call will not be fun. C&R Racing custom built my rad, shroud and was sold their 1st 3 speed electric fan set up. They claimed I would be fine even if I wanted to upgrade to a pro-charger or 1500HP. Time will tell. Guess this is the price you pay for high performance

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'68 Camaro with RS conversion
Moser 9" with 4:11
Martz Chassis 4-link and Front Sub-frame
Tremec T-56 Magnum 6 speed
572 BB - CM Engines
Wilwood 6 piston front and 4 piston rear disc
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post #12 of 110 (permalink) Old Jul 16th, 19, 03:47 PM
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Re: 572 Running hot or just the gauge?

Quote:
Originally Posted by pittpens24 View Post
Don I hope you are way off base there. If my gauge is right my next call will not be fun. C&R Racing custom built my rad, shroud and was sold their 1st 3 speed electric fan set up. They claimed I would be fine even if I wanted to upgrade to a pro-charger or 1500HP. Time will tell. Guess this is the price you pay for high performance

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What determines the fan speed? Maybe they are running too slow. When the temperature is 210 are the fans running max speed? Maybe C&R targeted modern engine temperatures with their design. It sounds like that is what you might have....

Don
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1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
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post #13 of 110 (permalink) Old Jul 17th, 19, 03:32 AM Thread Starter
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Re: 572 Running hot or just the gauge?

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Originally Posted by dhutton View Post
What determines the fan speed? Maybe they are running too slow. When the temperature is 210 are the fans running max speed? Maybe C&R targeted modern engine temperatures with their design. It sounds like that is what you might have....

Don
It is at max speed at 210 and you may be right. Off the top of my head I can't remember the intervals that were programmed into the controller but I did have input and almost certain that full speed is set for 185.

Funny thing, when I shut the car off after running "210 on the gauge", I usually turn the key back on to let the fan run. After only a minute or so, the fan is kicking down to medium

Might not hurt to give a call today to be proactive and pick their brain especially since I have a one off and 1st run item.

Thanks and keep ya posted

'68 Camaro with RS conversion
Moser 9" with 4:11
Martz Chassis 4-link and Front Sub-frame
Tremec T-56 Magnum 6 speed
572 BB - CM Engines
Wilwood 6 piston front and 4 piston rear disc
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post #14 of 110 (permalink) Old Jul 17th, 19, 04:20 AM
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Re: 572 Running hot or just the gauge?

Quote:
Originally Posted by pittpens24 View Post
It is at max speed at 210 and you may be right. Off the top of my head I can't remember the intervals that were programmed into the controller but I did have input and almost certain that full speed is set for 185.

Funny thing, when I shut the car off after running "210 on the gauge", I usually turn the key back on to let the fan run. After only a minute or so, the fan is kicking down to medium

Might not hurt to give a call today to be proactive and pick their brain especially since I have a one off and 1st run item.

Thanks and keep ya posted
Is the fan controller temperature sensor in the radiator? Sounds like it is.

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
1969 Mustang Sportsroof project
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post #15 of 110 (permalink) Old Jul 17th, 19, 04:37 AM Thread Starter
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Re: 572 Running hot or just the gauge?

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Originally Posted by dhutton View Post
Is the fan controller temperature sensor in the radiator? Sounds like it is.



Don
Yes

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'68 Camaro with RS conversion
Moser 9" with 4:11
Martz Chassis 4-link and Front Sub-frame
Tremec T-56 Magnum 6 speed
572 BB - CM Engines
Wilwood 6 piston front and 4 piston rear disc
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