Thread: COOLANT-WATER RATIO?

50/50 coolant concentrate to water.

The concentrate level can be dropped back, to roughly 33% depending on the coolant used but you'll reduce the life and corrosion resistance of the coolant, but should also increase the heat transfer, although when using an OAT this will be marginal, it's more effective with a silicate type additive system in the coolant.

It depends on how you buy it as to how you mix it, I use the tectalloy stuff from supercheap, repco and Kmart, the flushing agent is usually available from supercheap and repco.

To me the important part is



DISTILLED WATER ONLY.
I wonder if teh mixes use tap water or distilled water.
My core has now lasted 12 years with 50/50 and distilled wtaer.

Regards Philip A

I changed my coolant this morning in my 93 D1 using the 50/50 eth/glycol mix with distilled water. pre blended prior to pouring it in.

However, I've noticed that the temp now runs at half on the needle as opposed to my old regular setting of the needle sitting between 1/4 and the 1/2 mark.

Do I give it time to really circulate in or am I worrying about nothing??

Originally Posted by JMAN

I changed my coolant this morning in my 93 D1 using the 50/50 eth/glycol mix with distilled water. pre blended prior to pouring it in.

However, I've noticed that the temp now runs at half on the needle as opposed to my old regular setting of the needle sitting between 1/4 and the 1/2 mark.

Do I give it time to really circulate in or am I worrying about nothing??

Ethylene Glycol has a lower specific heat than water, so a 50/50 mixture has more trouble carrying away the heat. This mixture is for winter only, I wouldn't run it in warmer weather. Despite your mixture raising the boiling point of the coolant, it gets hotter faster, so you don't want it until the frost sets in.

Originally Posted by bee utey

Ethylene Glycol has a lower specific heat than water, so a 50/50 mixture has more trouble carrying away the heat. This mixture is for winter only, I wouldn't run it in warmer weather. Despite your mixture raising the boiling point of the coolant, it gets hotter faster, so you don't want it until the frost sets in.

Every one seem's to have a different idea!

Originally Posted by bee utey

Ethylene Glycol has a lower specific heat than water, so a 50/50 mixture has more trouble carrying away the heat. This mixture is for winter only, I wouldn't run it in warmer weather. Despite your mixture raising the boiling point of the coolant, it gets hotter faster, so you don't want it until the frost sets in.

So from what you're saying, I could top up with straight distilled water so that it dilutes a little and therefore having better cooling properties?

Are you really saying coolant additive reduces the heat transfer properties? Surely coolant would be a different chemical if that was the case!