pcmhacking.net

I dont like posting links to other places but this is a good read .... And highlights overlookef issues with boosting a unopend donk let me no what you think...... http://www.gmhightechperformance.com/te ... ck_retard/

I see a few errors in the above URL. Anyone else pick them?

kojab wrote:I see a few errors in the above URL. Anyone else pick them?

That article also contains some very poor English!

Yes it is very painful to read.

Try the english version not translated?

http://www.gmhightechperformance.com/te ... ck_retard/

i think running slightly cooler thermostat, 82c and good quality distilled water/ coolant mix is fine, the usual problem with coolant is that is can boil causing a hot spot and then temps to rise potentially causing preignition, use a lower thermostat to keep the coolant flowing before it gets to hot and even perhaps drill a hole or two in the thermostat or get a hi flow version if your going to be doing some heavy work heating the engine. There was quite a few tests done on that waterless coolant stuff and found it to be less efficient and worse at thermal transfer than normal coolant mix but it does not boil very easily so it will keep those hot spots to a minimum. I reckon if they ran quality coolant and lower thermostat in the dyno car there would be stuff all difference. Also if this stuff was the bee's knee's then every water cooled pc in the world would have it, but no they all run distilled water with antifungal/corrosion as water is still the best for heat transfer.

The1 wrote:i think running slightly cooler thermostat, 82c and good quality distilled water/ coolant mix is fine, the usual problem with coolant is that is can boil causing a hot spot and then temps to rise potentially causing preignition, use a lower thermostat to keep the coolant flowing before it gets to hot and even perhaps drill a hole or two in the thermostat or get a hi flow version if your going to be doing some heavy work heating the engine. There was quite a few tests done on that waterless coolant stuff and found it to be less efficient and worse at thermal transfer than normal coolant mix but it does not boil very easily so it will keep those hot spots to a minimum. I reckon if they ran quality coolant and lower thermostat in the dyno car there would be stuff all difference. Also if this stuff was the bee's knee's then every water cooled pc in the world would have it, but no they all run distilled water with antifungal/corrosion as water is still the best for heat transfer.

Thats right, I know coz my PC is water cooled and every degree counts.

Be careful with high flow thermostats, personally I believe they are a marketing gimmick. The thermostat is there to reduce/control flow (otherwise why not just run without one...). If the coolant moves to fast it can't absorb/transfer that heat and therefore reduces the efficiency of the cooling system.

If the coolant system is bled properly and you have coolant flow than you shouldn't get any localised hot spots/boiling unless there is a problem with the design of the coolant system. The Holden V8 is a typical example of this. Standard type 304/308's tend to blow head gaskets at the back of the engine, HDT came up with a simple mod were they bleed coolant from the rear of the heads which eliminates the dead spot in the coolant system and no more head gasket problems.

The other thing you need to remember is that things like the water pump, alternator and power steering pump are geared to provide enough flow/pressure/voltage at idle to every day driving revs, spin them at max engine revs and they are not working efficiently. A water pump with standard pulleys is going to be spinning way to quick at max revs and probably cavitate which is going to cause issues.

I've always wondered about that theory on fast moving water not absorbing as much heat, but then it need to get rid of less heat in the radiator so couldn't one cancel out the other ?

that said I know if a cooling system is big enough and setup properly you will have no issues with needing Band-Aid fixes!

Yeah, I've often wondered about it too. I find it funny that even electric water pumps use a restrictor in place of the thermostat to control the coolant flow so that the engine temperature stabilises.