[killerbee]

RJ, funny you mention that. The rear stat has them! I am still trying to figure out (in my grand theory ) why they are not effective in the mentioned mechanism.

Without a sufficient explanation for the failure of these "jiggly balls" (anyone can hear them rattle, just squeeze the upper hose) to purge gases, my theory has no merit.

 

[RacinJason73]

RJ, funny you mention that. The rear stat has them! I am still trying to figure out (in my grand theory ) why they are not effective in the mentioned mechanism.

Without a sufficient explanation for the failure of these "jiggly balls" (anyone can hear them rattle, just squeeze the upper hose) to purge gases, my theory has no merit.

The rear stat has that feature! NO kiddin? I haven't looked that closely (of course, I will have to do so now). Being curious now, can you please elaborate why you think they are not operating correctly?

 

[killerbee]

Being curious now, can you please elaborate why you think they are not operating correctly?

I have long looked for improvements to what appears to be part cavitation. Looking at scores of datalogged charts, it appears that, in most cases, coolant flow does not rise linearly with rpm. Usually the pump is the center of focus, specifically pump non-linearities. In high flow applications like ours, usually cavitation. The pump flow head curve takes on a hooked appearance at the top, indicating a point where cavitation flattens and eventually reduces coolant flow.

Many coolants are helpful at reducing this nature BTW, but pump design is the primary culprit.

I opened a housing the other day, and once I pulled the front stat out, there were sections underneat that were bone dry. By itself, it has little value in drawing concluisons. But we drilled a hole in that stat, and he has been claiming that the system is behaving differently, takes a lot longer to warmup. Improvement? Who knows. Placebo? :Thumbup:

Clearly repeatable, however, is the recurring statemnt "I flushed it, now I can see the stats cycle on the ECT gauge", or "edge now shows 180 +/-, I never saw it below 195 before". Or "all of a sudden, the degas took a gallon", after replacing the pressure cap.

If only the whole system was made of plexi, this would be less perplexing.

 

[RoaDkilL]

buddy of mine has an LLy that ran high temps, flushed the engine and radiator, clean the stats and instaled new dexcrap and it ran lower temps to. good advise on the pressure cap, that can cause pressure problems and higher temps to.

:squish

 

[idahofox]

An Opinion

The single most common cause of OverHeating is " Entrained Air ".

In a pressurized system ( ~ 10 - 15 psi ) the most likely source of EA is an improperly Purged system.

In my opinion the most complete and efficient way to achieve a " Purged System " is to vacuum it. Several members in various venue has addressed this method of purging. It does take special equipment, not the only procedure, but by far the quickest and is very efficient.

Other methods are as effective but more time consuming.
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As KillerBee has stated the TStats and Tstat housing are/is complicate to an LLY OH event.

The Tstat position is controlled by an internal Wax Pellet that responds to changes to it’s temperature. The WPT is meant to be in consort with engine coolant temperatures; however when Stagnant coolant surrounds the TStat, WPT lags the ECT delta; the stack-air T delta lags the ECT delta; the fan coupling lags the ECT delta and Every Thing is Behind a Power Curve and Can Not catch up.

Drilling the hole ( 3/16" or 1/8" ) in the FRONT TStat, as KB has said, will at a minimum, mitigate the above conditions.

This is behavior modification, it will not Solve the cause for OH. It will however, IMO, return some control of the event, to the driver.
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OH is cured by increasing BTU exchange to a separate air stream from the stack; IMO.
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If your OH’ing, back off, dumbie. oke:

FWIW.

 

[DMAXITOL]

Has anyone found a 190* stat that will fit the front slot? Since the EOC w/o mocal install 190* is my normal non towing ECT. The duramax seems to like life better there. Anywho I want to do the drill deal, are the gaskets re usable? 270,+++ miles on the Ole girl, time for new stuff anyway.:shrug:

 

[killerbee]

Has anyone found a 190* stat that will fit the front slot? Since the EOC w/o mocal install 190* is my normal non towing ECT. The duramax seems to like life better there. Anywho I want to do the drill deal, are the gaskets re usable? 270,+++ miles on the Ole girl, time for new stuff anyway.:shrug:

The stats come with gaskets, but are mormally re-useable, at least I have reused them.

I have not found a 190, but I haven't looked hard.