Overheating issues at the track. Any ideas??
#107
Drifting
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.
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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.
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IMHO, only half of this statement is true and even thats is not accurate statement. I don't know what you consider "high" boost or heavy detonation but, we have experienced "blow by" in applications over 550-600rwhp (roughly 22-23psi boost with 16v and 8v heads) with ZERO detonation (Knock is verified with digital knock sensing devices with full timing retard control).
The reason why I call it "blow by" and not "head lift" is because the leak is happening in the distance between the headstuds and not at or close to the headstuds.
The reason why I call it "blow by" and not "head lift" is because the leak is happening in the distance between the headstuds and not at or close to the headstuds.
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.
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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.
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.
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.
Last edited by evil 944t; 03-28-2010 at 10:33 AM.
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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.
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.
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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….
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….
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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.