Re: Coolant quiz
Originally Posted by
MoparFreak69
My math (good luck following it! It confuses even me!);
Start out with 50/50 mix
__________________________________________7.25L water 7.25L coolant
Remove 9 liters of mix_______________________ -4.25L water -4.25L coolant
Add 8 liters water___________________________10.5L water 2.5L coolant 19% mix (2.5L devided by 13L total amount of fluid)
Remove 8 liters of mix (61% of total fluids)_______ -6.5L water -1.5L coolant (10.5L water *.61 = 6.5, 2.5L coolant *.61=1.5)
Add 8 liters water___________________________ 12.0L water 1.0L coolant 7% mix (1L devided by 13L total amount of fluid)
Remove 8 liters of mix (61% of total fliuds)_______ -7.4L water -.6L coolant (12L water *.61=7.4, 1L coolant *.61=.6L)
Add 4L of water and 4 of coolant________________ 8.6L water 4.4L coolant 34% mix (4.4L devided by 13L total amount of fluid)
Even if you get it completely topped off (at full 14.5L) with 50/50 mix from a bottle you are only adding another .75L of coolant. This gives you a slightly better 35% mixture.
To make it easy and discard all irrelevant numbers just work with what is left in the system not what is taken out.
After first drain there is 2.5 liters water and 2.5 liters of coolant in the system, a 50/50 mix.
In the system after adding 8 liters is, (8 + 2.5 ) liters of water and 2.5 liters of coolant.
Remove 8 liters which is 61.5% (8/13 x 100) and there remains 38.5% in the system. 38.5 % of 2.5
= .96 liter
After adding 8 liters there is (8 + 4.04)liters of water and .96 liters of coolant in the system.
Remove 8 liters = 61.5% and there remains 38.5% of the .96 liters = .37 liters coolant and 4.63 liters of water in the system.
The full system requires 7,25 liters water and 7.25 liters of coolant, so add 6.88 liters of coolant and top up with 2.62 liters of water.
(6.88 new + .37 old) coolant + (2.62 new + 4.63 old) water = 14.5 liters
I think this is correct, I get the same figure if I do it in fractions rather than percentage.
MoparFreak69 is correct.
Cool is appropriate here I think.
I went to a 50/50 mix in the system.
Last edited by onehundred80; Sep 12, 2012 at 05:30 PM.