gt37vgt

doing a steam vent thing while the head is off ?

JET951

thats right Tom.
our systems actually dont have an overflow bottle, as the coolant tank is part of the pressurised system. Most australian and Japanese cars have a separate overflow system. So when the system exceeds the radiator cap pressure (we use the 1 bar caps, although there is a 1.5bar cap available for our cars) the coolant is expelled into the expansion bottle. when the system cools down it causes a vacuum in the cooling system which will suck the expelled coolant back into the cooling system


Hi John
We are using a 944 NA head on Patricks car, in his previous turbo head the liners where showing signs of breaking up.

JET951

No we didnt Adam,
I drove Patricks car home yesterday to test it out before he gets it back. Patrick has a steam vent kit but we couldnt find it at work. all seems good with Patricks car now

gt37vgt

slack ... You could have whipped one up out bits from the plumbing or out auto shop

gt37vgt

scoff "slack" said the guy sitting at home doing nothing LOL

333pg333

John, any reason why you asked about this just now? I'm just curious.

gt37vgt

got i nice ported turbo head here for ya Patty

fast951

While involved with a different project, I came across something interesting. Which may or may not apply to your engine! Just trying to determine any commonality.

fast951

Hi Sean, hopefully you saved the old gasket!

Chris White

So, its inaccurate but then you agree with it because you had blow by instead of head lift….

I suppose I should always include some sort of disclaimer about any comments not covering every possibility of engine combination out there.

At the power levels you mention there are other issues effecting the integrity of the head gaskets…Hopefully Neil has mentioned these to you.

evil 944t

No need for a disclaimer, I'm only talking about the 944 world. I only agree to some degree. It is only accurate if you run huge boost(which most don't run here, nor do I) and if there is major detonation(which should show signs elsewhere not just burning the HG).

I'm not agreeing or dissagreeing because I choose to call it "blow by" vrs "headlift". IMHO, they are two different issues. The problem is, not that the head is lifting, rather, it is not clamping down around the whole cylinder.

Regarding other issues with the HG, none that we have found. I have zero HG issues because of the design of the HG. Regarding Neil, no HG issues for him either. At these levels, there are many other issues, Perhaps you will find out someday. I don't want to go further OT but as an example, cooling, oiling and block integrity all need to be addressed.

theedge

Back to an earlier topic, I really like Evans coolant in my car. The only real downsides are the price ($30-40USD/gallon I think) and the fact that its slippery as hell so not all tracks allow its use.

I have installed drain valves in the rad, block, and bleeder neck to go along with my Evans. This is to make for tidy draining back into the bottles, minimum coolant waste and mess. I just attach a hose and open the valve, which can also be safety wired closed for security.

gt37vgt

is "Evans" the only option ?? is that ethline glycol ?
is that whats NASCAR's use ?

Chris White

A couple of cooling facts –
Water transfers heat best when used straight (no coolant).
Straight water has no corrosion inhibitors or lubricants.
Typical cooling systems increase the boiling point by increasing the system pressure.
“antifreeze” raises the boiling point but also reduces the heat transfer (its also very poisonous)
Evans significantly raises the boiling point (reducing pressure) – nonpoisonous (in fact the main ingredient can be found in Twinkies…!)
Evans is slipperier than snot on cold concrete.

If you have a ‘leaker’ you do not want to run Evans…its too expensive and other folks on the track will not like you much…I like a lot of the properties that the Evans coolant has – but you need to do the conversion correctly. Even a little water will compromise the performance.

BTW – with a clean radiator you will not have a cooling problem….

333pg333

So unlike oil seepage/leaks, the coolant system is less prone to these and therefore something like Evans is safe to use? Not sure if it's available here...have to look around.