[Formulabruce]

Originally Posted by RamAirIV28

there is a service/product offered by dart machinery, its a coating they apply to internal engine coolant surfaces that protects the surfaces from corrosion.

interesting, what brings this stuff to areas we cannot access?

[Captainofiron]

Originally Posted by Formulabruce

interesting, what brings this stuff to areas we cannot access?

I would assume they just pour the stuff through, and let it form a layer on the metal, then pour the bulk of the fluid out


Back to the original topic:
Now that Im thinking about it, my 97 trans am, has the lt1 which has iron block, alum heads and water pump. it has always had the "dexcool" orange coolant. I have never noticed any major corrosion inside the pump or t-stat housing

[Firebob]

What started my wondering about this in the first place was looking at some old Tstat housings and inside some old timing covers that were pretty eaten up. I guess there's no way to tell if straight water was used for years in these motors so maybe there isn't that much to worry about if decent inhibitors are used. I just didn't want my expensive investment of new alum heads to get eaten away.

[Formulabruce]

dex cool ruined my LS cooling system, overflow tank ruined, and radiator flow severly restricted due to gunk in the bottom... Dex Cool sucks unless its changed ALOT, and its another reason why its GONE from GM now

[Formulabruce]

Originally Posted by Firebob

What started my wondering about this in the first place was looking at some old Tstat housings and inside some old timing covers that were pretty eaten up. I guess there's no way to tell if straight water was used for years in these motors so maybe there isn't that much to worry about if decent inhibitors are used. I just didn't want my expensive investment of new alum heads to get eaten away.

Where there is air and changing tempertaures, youll find more corrosion.. when you do the Evans cooling you remove all the water.. NO oxygen ( H20), no corrosion. Since it doesnt expand like water mix, you can fill the cooling system and get all the air out... runs at almost no pressure at 220 degrees too. displacing all oxygen is a big part of the answer.

[Captainofiron]

Originally Posted by Formulabruce

dex cool ruined my LS cooling system, overflow tank ruined, and radiator flow severly restricted due to gunk in the bottom... Dex Cool sucks unless its changed ALOT, and its another reason why its GONE from GM now

yep, its plugged up my heater core many many times

[Firebob]

Well so much for using Dex cool.

[Pontirag]

the latest edition of engine masters, on page 37 clearly shows the head being grounded to the block. and as ramair stated, Dart machinery, who do the engine and head casting, they offer a coating that is used in the marine engine industry to prevent corrosion.

grounds serve two perposes to create a continued electrical circuit and because of that conplete electrical circuit electricity does not trave by other paths, think of it as though you are chrome plating something only the opposite because you dont want a metal to transfer. so the comlete electrical ciruit goes handin hand with corrosion avoidance.

bad grounds cause two problems they create electrical problems for electronic gear used on engines and they are compelled to use the most direct route to ground and in so doing they transfer some aluminum , certainly away from aluminum components but the alumium desolves and stays in solution or solidifies and falls out of solution and ends up either building up as a white cristeline sediment in the bottom of the cooling system or it builds up on a metal surface and acts as a barier to hear transfer or an impediment fo coolant flow.

fresh antifreeze every two years and a good flush should do it, if an opportunity prsents itself to remove the freeze plugs then the sediment that builds up in the bottom of the block should be removed

anodes work too but still the engine should be flushed and also with the specific additional intent to remove the sediment from the anode that builds up in the system.

and you certainly do not want the head gasket, any head gasket, or o ring to be relied upon to ground the head to the block, its a gasket thats its purpose and head movement and cycles of expansion and contraction will cause fretting corrosion and other problems over an extended period of time. so ramair was correct there

I dont know why this had to turn into a beachfest against ram air. his information was right on the money. too bad.