Glycol or Water; which is the better Coolant?
05-09-2013, 08:16 PM
#2
Have you looked into Evans yet?
05-09-2013, 09:25 PM
#7
Team Owner
..
Last edited by Mrmerlin; 05-11-2013 at 01:48 AM.
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05-09-2013, 09:36 PM
#8
Rennlist Member
NOTE adding new chemicals or a lack of coolant chemicals to your engine will usually cause unwanted deterioration of the exposed head gaskets,
the same goes for flushing the block.... DONT....do it!
just drain and refill, this can rinse away parts of the headgaskets that may have been sealing and increase the chance of head gasket failure.
And more....
for your early car the HGs are usually the hardest parts to care for since you cant see them.
If you have ever taken off a head on a 928 you will see the HGs are exposed to coolant all the time the only parts that dont see coolant are the rings around the cylinders and at the edges around the block.
The heads are the parts that get eaten from corrosion, the HGs corrode also and sort of disintegrate as time passes,
flushing the HGs with fresh water will usually dislodge parts of the HGs and then they usually start leaking since parts of them have been removed .
That said keeping a fresh mix of good coolant in the system should prolong the amount of time you have till the HGS need to be replaced,
it seems the early 16V cars have more issues with the HG failing but of course they are older.
A quick clue to HG health is to look along the inner edge of the HG in the V of the block to see if there is white crusty deposits along the edge of the HG,
if you see this then it wont be long till HG replacement is in your future.
the same goes for flushing the block.... DONT....do it!
just drain and refill, this can rinse away parts of the headgaskets that may have been sealing and increase the chance of head gasket failure.
And more....
for your early car the HGs are usually the hardest parts to care for since you cant see them.
If you have ever taken off a head on a 928 you will see the HGs are exposed to coolant all the time the only parts that dont see coolant are the rings around the cylinders and at the edges around the block.
The heads are the parts that get eaten from corrosion, the HGs corrode also and sort of disintegrate as time passes,
flushing the HGs with fresh water will usually dislodge parts of the HGs and then they usually start leaking since parts of them have been removed .
That said keeping a fresh mix of good coolant in the system should prolong the amount of time you have till the HGS need to be replaced,
it seems the early 16V cars have more issues with the HG failing but of course they are older.
A quick clue to HG health is to look along the inner edge of the HG in the V of the block to see if there is white crusty deposits along the edge of the HG,
if you see this then it wont be long till HG replacement is in your future.
05-09-2013, 10:01 PM
#9
Team Owner
dont flush the block ,
just drain it and refill following the instructions above.
This info is regarding the original HGs ,
the new HGs have not been in service long enough to tell how well they hold up
just drain it and refill following the instructions above.
This info is regarding the original HGs ,
the new HGs have not been in service long enough to tell how well they hold up
05-09-2013, 10:55 PM
#10
Rennlist Member
IMHO, Good time to make the switch to Evans waterless. Just purchased 5 gallons for Just Peachy. T
Research here: http://www.jaylenosgarage.com/video/...olant/1376127/
and here: http://www.evanscooling.com/products/coolants/
Click on photo to purchase:
Research here: http://www.jaylenosgarage.com/video/...olant/1376127/
and here: http://www.evanscooling.com/products/coolants/
Click on photo to purchase:
Last edited by 77tony; 05-09-2013 at 11:17 PM.
05-09-2013, 11:42 PM
#11
Team Owner
That coolant looks like it might be nice to install. I dont have any experience with it, and i dont think installing it in a engine that has 25 year old gaskets would be a good idea.
For an engine thats fresh no problem
For an engine thats fresh no problem
05-09-2013, 11:47 PM
#12
Rennlist Member
http://www.jaylenosgarage.com/video/...olant/1376127/
05-09-2013, 11:51 PM
#13
Administrator - "Tyson"
Lifetime Rennlist
Member
Lifetime Rennlist
Member
No thank you.
Local wrench did some testing with Evans on his engine dyno, long story short it may be great at preventing corrosion, it was far worse than water when it came down to cooling performance. It was so horrible that even a stock engine ran so hot detonation became a big issue, much less a highly modified one (which is what he's normally tuning).
Zerex G-05 changed every couple of years and you will be fine.
Local wrench did some testing with Evans on his engine dyno, long story short it may be great at preventing corrosion, it was far worse than water when it came down to cooling performance. It was so horrible that even a stock engine ran so hot detonation became a big issue, much less a highly modified one (which is what he's normally tuning).
Zerex G-05 changed every couple of years and you will be fine.
05-10-2013, 12:38 AM
#14
Race Director
mrmerlin speaks the truth.... MANY so many 928's especially early ones have deteriorating head gaskets and don't even know.....I have seen 928's that were parked for extended periods and the results are always BAD....the short answer is the coolant-water turns into an acidic battery and eats the engine....the head studs, water pump impeller, head and head gasket all get destroyed....
My racer sat for only about a year...it was filled with distilled water and water wetter prior to my purchasing it.....when I bought it the coolant was full of rust....so was the radiator.... It took me several flushes of the radiator to stop the brown-red water from coming out.....and that was only after one year.....
My racer sat for only about a year...it was filled with distilled water and water wetter prior to my purchasing it.....when I bought it the coolant was full of rust....so was the radiator.... It took me several flushes of the radiator to stop the brown-red water from coming out.....and that was only after one year.....
05-10-2013, 07:15 AM
#15
I am about to change the coolant in my UK 1990 S4 and don't know what has been used previously. So chances are I'll be changing coolant type from ? to G-48 aka G-11. In this situation is it still not advisable to do a coolant flush? I don't want end up residue of the old coolant mixing with the new stuff.
Also any opinions on G-48 which claims to be recommended for all pre 1996 Porsche, Mercedes, VW, BMW, etc? G-05 doesn't seem to be readily available in the UK.
Also any opinions on G-48 which claims to be recommended for all pre 1996 Porsche, Mercedes, VW, BMW, etc? G-05 doesn't seem to be readily available in the UK.