• When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Does a rebuilt engine run warm until the break in is finished?

The major factors for heat transfer are the amount of masses to be involved in the transfer, both of the water flow and the airflow, AND the temperature difference between the two, not time. There are of course others less critical like the ability of the coolant to transfer heat, etc.

Excessive water flow concerns only enter the picture when water flows fast enough over/around internal obstructions than it can cavitate even with the normal cap induced static pressure in the system creating hot spots that are difficult to detect, ie likely very rare.
 
What causes the low temperature differential between the top and bottom radiator hoses?

What us considered normal?

Is too great a difference bad?
 
Rather than shooting the upper and lower hoses with the temp gun, try shooting the upper and lower tanks near the hose connections and see what the difference is. Temp guns read some types and colors of surfaces more accurately than others, black, metallic being generally the best.
 
themechanic said:
What causes the low temperature differential between the top and bottom radiator hoses?
Click to expand...
a. Not enough airflow
b. Air Temperature too close to water temp
c. Not enough radiator between the two
d. inadequate heat absorption by the coolant chosen
e. the radiator hoses are possibly over insulated and preventing a realistic measurement on the internal water temp
themechanic said:
What us considered normal?
Click to expand...
a. Whatever allows the engine to operate at the chosen temp
themechanic said:
Is too great a difference bad?
Click to expand...
a. No because, the thermostat chosen will regardless maintain the min temp, it would however indicate the system is over designed and overcapacity, at that moment it is being measured
 
AR67GTX said:
Rather than shooting the upper and lower hoses with the temp gun, try shooting the upper and lower tanks near the hose connections and see what the difference is. Temp guns read some types and colors of surfaces more accurately than others, black, metallic being generally the best.
Click to expand...
Top rank is easy. Bottom tank will require a bit of contortion of the body
 
themechanic said:
No.
Click to expand...
I seen were its a original AC car , I just wondered if the classic air was a new addition ?
One easy test on idle air flow is to place a dollar bill on the grille front.
At operating temp with the fan locked up at low idle that bill should stay in place. If it slips down or falls off you do not have enough air flow.
 
1967coronet said:
I seen were its a original AC car , I just wondered if the classic air was a new addition ?
One easy test on idle air flow is to place a dollar bill on the grille front.
At operating temp with the fan locked up at low idle that bill should stay in place. If it slips down or falls off you do not have enough air flow.
Click to expand...
I had the AC installed in 2012.

A red shop rag sticks to the condenser at idle; hot and cold. You can feel the air blow out from under the hood where it meets the fenders.
 
You must log in or register to reply here.

Similar threads

themechanic
Ten Rules for Maximum Cooling
2
Replies
38
Views
1K
Randy Wilson
R
Z
440 Highway temps
2 3 4
Replies
69
Views
5K
Some Car Guy
S
S
Water pump,outlet, thermostat, hoses, cap, recomendation
Replies
6
Views
949
Shut
S
1
Evan’s waterless coolant
Replies
12
Views
634
Unkle Krusty
Unkle Krusty
J
Cooling issues 69 RR 440 at wits end!
2 3
Replies
40
Views
2K
themechanic
themechanic
Auto Transport Service
Back
Top