dmax cooling flow.... simon......

[malibu795]

so for competition, would there be an EGT (gain by lossing??) if the turbo thermostat was removed?

turbo t-stats from what i have been told opens @ 13X* ecm doesnt allow full fueling till 162* coolant temp on majority of hte trucks.

takeing the t-stat out would allow constant flow through the trubo..

two thing could happen.
over heat the trubo.. ie coolant moving too fast to pick up enough heat
over cool the turbo which would thicken the oil and possible create mroe stress on the shaft.

 

[Fingers]

More flow does not make something overheat. It will increase the cooling of the component.

Over cooling the turbo makes it sluggish and increases the shaft stress. A warm turbo is a happy turbo.

 

[the4wheeler]

well if your flowing coolant to fast over/thou a part like small block chevy heads/radiators for example ,there is not enough time for the coolant to efecentley pick up or shed the heat that is in a particular airia

as most of us have seen small block chevy heads and gaskets the ports for cooling in the heads are way bigger than the holes in the head gaskets... allows the coolant to travel slower and remain in contact for maximum heat transfer before moving on down the system

purity much what i was tought back in auto shop

overheat could potently happen given enough time

 

[malibu795]

More flow does not make something overheat. It will increase the cooling of the component.

Over cooling the turbo makes it sluggish and increases the shaft stress. A warm turbo is a happy turbo.

please explain how you can warp a head with out a t-stat on a gasser engine.

 

[JoshH]

please explain how you can warp a head with out a t-stat on a gasser engine.

Cavitation?

 

[Ben46a]

How many gals a minute does the water pump flow?

 

[Mike]

please explain how you can warp a head with out a t-stat on a gasser engine.

A thermostat increases pressure in the block and head/s so as to allow more heat to transfer before creating air pockets cuz the coolant will boil to fast. Pressure = increased heat in the cooling medium before the fluid boils.

And cuz a restriction is required before pressure can build......

 

[Fingers]

well if your flowing coolant to fast over/thou a part like small block chevy heads/radiators for example ,there is not enough time for the coolant to efecentley pick up or shed the heat that is in a particular airia

The amount of heat transfered is strictly a function of the temperature difference between the two media. In this case, the engine metal and the coolant as well as the coolant and the radiator.

as most of us have seen small block chevy heads and gaskets the ports for cooling in the heads are way bigger than the holes in the head gaskets... allows the coolant to travel slower and remain in contact for maximum heat transfer before moving on down the system

Look at those holes again. They are also different sizes. That is an attempt to equalize the flow across the head and engine. The Dmax head gaskets are similar. Without some restriction in the system the flow will take the shortest path.

purity much what i was tought back in auto shop

overheat could potently happen given enough time

Too little flow will boil the coolant. Thermodynamically, there is no such thing as too much.

 

[Fingers]

please explain how you can warp a head with out a t-stat on a gasser engine.

IIRC that is a quenching problem. Cooling the head too quickly and unevenly. Probably would happen on the Dmax too.

 

[SIKDMAX]

 

[duramaximizer]

More flow does not make something overheat. It will increase the cooling of the component.

Over cooling the turbo makes it sluggish and increases the shaft stress. A warm turbo is a happy turbo.

I understand that, but a really hot turbo is a quiter. We can light the stock turbo fine and it has no problems getting hot. Just asking if this would make it live longer?

 

[TxChristopher]

alright Bu I apologize, TXchristopher explained it to me a long time ago as backwards to what you stated. It was something to do with the cooling system, so I took his word as the gospel (which turned out to be incorrect).

Blah hah ha ha ha :rofl: if you think I had it wrong you are surely mistaken. The turbo cooling loop is suction driven NOT pressure driven, and it isn't flowing INTO the upper radiator hose pipe, it is drawing FROM it. This was covered a long long time ago, and I know I have it right.

But you might be mistaken on what you remember, rather than what *I* related to you. Feel free to search my old posts, I would prefer that to you declaring my "gospel" was wrong when it wasn't. :hello:

 

[TxChristopher]

IIRC that is a quenching problem. Cooling the head too quickly and unevenly. Probably would happen on the Dmax too.

That and a low pressure problem from the removal of the stats, the boiling point of the coolant is lowered dramatically and causes localized boiling and very poor heat exchange as a result. Then as you said the head is cooled very unevenly.

Removing the stats creates a PRESSURE problem more than a FLOW problem. Yes the two sorta go hand in hand but cooling is never reduced by more flow, thats for sure.

 

[malibu795]

Cavitation?

cavitation is caused by a stoppage of fluid flow. either on the supply or discharge side

A thermostat increases pressure in the block and head/s so as to allow more heat to transfer before creating air pockets cuz the coolant will boil to fast. Pressure = increased heat in the cooling medium before the fluid boils.

And cuz a restriction is required before pressure can build......

true BP increase as pressire increses 1 psi to 12*? cant remeber
thus can hold more heat before the medium boils or developes air pockets on the surface.

 

[malibu795]

Blah hah ha ha ha :rofl: if you think I had it wrong you are surely mistaken. The turbo cooling loop is suction driven NOT pressure driven, and it isn't flowing INTO the upper radiator hose pipe, it is drawing FROM it. This was covered a long long time ago, and I know I have it right.

But you might be mistaken on what you remember, rather than what *I* related to you. Feel free to search my old posts, I would prefer that to you declaring my "gospel" was wrong when it wasn't. :hello:

.............. yet when i pull the line between the turbo and up radiator hose i get pressure........ not it sucking air.

 

[duratothemax]

Blah hah ha ha ha :rofl: if you think I had it wrong you are surely mistaken. The turbo cooling loop is suction driven NOT pressure driven, and it isn't flowing INTO the upper radiator hose pipe, it is drawing FROM it. This was covered a long long time ago, and I know I have it right. :

yes TX im agreeing with you (I only said the 'gospel' thing half sarcastically, I trust you are right, but I was kind of outnumbered especially when the 'gm tech' posted stuff and said I/you were wrong)..

I still think YOU are right. It doesnt make sense to have a thermostat on a return anyways does it?

Do you guys see houses wired with the light switch on the neutral side? No.

 

[Fingers]

.............. yet when i pull the line between the turbo and up radiator hose i get pressure........ not it sucking air.

The whole cooling system is under pressure. Both ends should squirt water. It is the pressure differential between the two points that moves the water.

 

[malibu795]

The whole cooling system is under pressure. Both ends should squirt water. It is the pressure differential between the two points that moves the water.

true..

but you dont regulate via temp on the supply side or up stream of the heat source.

 

[Fingers]

You don't want cold going to the turbo, so you regulate based on temp of the supply side.

 

[Fingers]

BTW, the water circulation during operation does little of the cooling. The oil is the primary cooling media. The water jacket comes into play for those hot shutdowns that tend to kill the oil only turbos.