quote:

ORIGINAL: timnikko

ok listen and listen good i will explain this oncether are three types of heat transfer ,conduction,convection and radiation lets concentrate on rad and conduction when heat radiatesit travels as an infared wave this wave can travel through a vacume and is the means by witch the sun heats the earth the most efficeint radiators are black because they emit radiation at all frequencies,,colors such as purple and blue emit radiation on those colors onlyand are comparatively inefficent,,, conduction is whereheat is passed on from one atom to another by means of agitation.one atom gets agitated by heat and this causes the surronding atoms to also be agitated and heat is conducted through the material materials where atoms are closed together (metals) are dense and this makes them good conductors of heat..so with that said when a car is being driven the heat sink is doing nothing, the majority of cooling (over 95%) is through air flow through the motor cut out so if you covet it guess what no air flow,,shiny objects reflect heat while matted objects absorb heat and radiate heat in the little gap between the motor and the heat sink heat will trasfer and cause inefficient cooling so in the end a heatsink will actually make a motor heat up faster and run hotter but it will cool downfaster after the run so does the heatsink work like you think,,, so you are a rust engineer well just a little about me i have worked on everything from a-6 ,,ea-6b,,p-3,, ch53 ,f-14and a-10's those are aircraft,,j-52 ,t-56 are jet and turbo prop jet engines, i have also worked in the field of NDI,,, i am a cerified auto mech and heavy truck mech i also tune and own a blown injected alcohol boat so i am somewhat educated and mecahnically inclined and the test was done on a motor with an infared heat gun

quote:

ORIGINAL: timnikko

ok listen and listen good i will explain this oncether are three types of heat transfer ,conduction,convection and radiation lets concentrate on rad and conduction when heat radiatesit travels as an infared wave this wave can travel through a vacume and is the means by witch the sun heats the earth the most efficeint radiators are black because they emit radiation at all frequencies,,colors such as purple and blue emit radiation on those colors onlyand are comparatively inefficent,,, conduction is whereheat is passed on from one atom to another by means of agitation.one atom gets agitated by heat and this causes the surronding atoms to also be agitated and heat is conducted through the material materials where atoms are closed together (metals) are dense and this makes them good conductors of heat..so with that said when a car is being driven the heat sink is doing nothing, the majority of cooling (over 95%) is through air flow through the motor cut out so if you covet it guess what no air flow,,shiny objects reflect heat while matted objects absorb heat and radiate heat in the little gap between the motor and the heat sink heat will trasfer and cause inefficient cooling so in the end a heatsink will actually make a motor heat up faster and run hotter but it will cool downfaster after the run so does the heatsink work like you think,,, so you are a rust engineer well just a little about me i have worked on everything from a-6 ,,ea-6b,,p-3,, ch53 ,f-14and a-10's those are aircraft,,j-52 ,t-56 are jet and turbo prop jet engines, i have also worked in the field of NDI,,, i am a cerified auto mech and heavy truck mech i also tune and own a blown injected alcohol boat so i am somewhat educated and mecahnically inclined and the test was done on a motor with an infared heat gun

quote:

ORIGINAL: mattnin

quote:

ORIGINAL: timnikko

ok listen and listen good i will explain this oncether are three types of heat transfer ,conduction,convection and radiation lets concentrate on rad and conduction when heat radiatesit travels as an infared wave this wave can travel through a vacume and is the means by witch the sun heats the earth the most efficeint radiators are black because they emit radiation at all frequencies,,colors such as purple and blue emit radiation on those colors onlyand are comparatively inefficent,,, conduction is whereheat is passed on from one atom to another by means of agitation.one atom gets agitated by heat and this causes the surronding atoms to also be agitated and heat is conducted through the material materials where atoms are closed together (metals) are dense and this makes them good conductors of heat..so with that said when a car is being driven the heat sink is doing nothing, the majority of cooling (over 95%) is through air flow through the motor cut out so if you covet it guess what no air flow,,shiny objects reflect heat while matted objects absorb heat and radiate heat in the little gap between the motor and the heat sink heat will trasfer and cause inefficient cooling so in the end a heatsink will actually make a motor heat up faster and run hotter but it will cool downfaster after the run so does the heatsink work like you think,,, so you are a rust engineer well just a little about me i have worked on everything from a-6 ,,ea-6b,,p-3,, ch53 ,f-14and a-10's those are aircraft,,j-52 ,t-56 are jet and turbo prop jet engines, i have also worked in the field of NDI,,, i am a cerified auto mech and heavy truck mech i also tune and own a blown injected alcohol boat so i am somewhat educated and mecahnically inclined and the test was done on a motor with an infared heat gun

I think you are very educated and you sound very intelligent sir. I think we are arguing about two different things.

The motor you see in my picture, the truck with the 4 wheel steering, has no openings for air flow at all. All of its heat is dissapated through heat sink. This is the way the motor came from the factory. I cannot comment on R?rebreeds motor. I do not know if he is covering up an air duct.

A heat sink works, otherwise it would have been a useless invention like tire chains for motorcyles. Also, rc-fan-addict brings up a good point; people put thermal conductive paste between their motor and heat sink for even more efficient heat transfer.

I agree with timnikko, do not put a heat sink on your motor if you end up covering air ducts.

quote:

ORIGINAL: timnikko

ok listen and listen good i will explain this oncether are three types of heat transfer ,conduction,convection and radiation lets concentrate on rad and conduction when heat radiatesit travels as an infared wave this wave can travel through a vacume and is the means by witch the sun heats the earth the most efficeint radiators are black because they emit radiation at all frequencies,,colors such as purple and blue emit radiation on those colors onlyand are comparatively inefficent,,, conduction is whereheat is passed on from one atom to another by means of agitation.one atom gets agitated by heat and this causes the surronding atoms to also be agitated and heat is conducted through the material materials where atoms are closed together (metals) are dense and this makes them good conductors of heat..so with that said when a car is being driven the heat sink is doing nothing, the majority of cooling (over 95%) is through air flow through the motor cut out so if you covet it guess what no air flow,,shiny objects reflect heat while matted objects absorb heat and radiate heat in the little gap between the motor and the heat sink heat will trasfer and cause inefficient cooling so in the end a heatsink will actually make a motor heat up faster and run hotter but it will cool downfaster after the run so does the heatsink work like you think,,, so you are a rust engineer well just a little about me i have worked on everything from a-6 ,,ea-6b,,p-3,, ch53 ,f-14and a-10's those are aircraft,,j-52 ,t-56 are jet and turbo prop jet engines, i have also worked in the field of NDI,,, i am a cerified auto mech and heavy truck mech i also tune and own a blown injected alcohol boat so i am somewhat educated and mecahnically inclined and the test was done on a motor with an infared heat gun

quote:

and brushed motors do suck