Water pump pulley

[shimmy]

Originally Posted by uncle benz

Show me some science that says rushing water through a radiator faster is better.

i also was wondering

i suppose a bigger rad may mean the water has same time to cool then faster flow may nean extra cooling.

if the water is gettting less time to cool then benefit is questionable

[shane@mbtech]

Originally Posted by shimmy

i also was wondering

i suppose a bigger rad may mean the water has same time to cool then faster flow may nean extra cooling.

if the water is gettting less time to cool then benefit is questionable

Bigger cooler is more surface area.

Think of electric shower, put on full speed, warm water. Put on low speed, hot.

Think of rad as a reverse of this.

[uncle benz]

Originally Posted by lawsy

Bigger cooler is more surface area.

Think of electric shower, put on full speed, warm water. Put on low speed, hot.

Think of rad as a reverse of this.

Now I'm even more confused. The reverse of that you say...

So is that slow speed = warm, fast speed =hot

Or full speed = cool, low speed = cold.

To my mind there must be an optimum speed of coolant flow for a given size of radiator. Surely too slow will mean the coolant is cooled A LOT in the radiator, at the detriment of the coolant left in the engine which will peak much higher.
Too fast and it won't be cooled sufficiently by the radiator before being pushed back into the engine?
Where is the Gorilla when you need him???

[adem.csl]

Originally Posted by alexk

So 37.69cm circumference vs 41.78cm.

Therefore -> 10% higher rpm on the water pump which means 10% increased water flow.

It sounds good.
I am not very happy with the way they look though.
Is this how they really are (photos) ?

What???? If one has a 12cm outer diameter and one has a 13.3cm diameter where did you get 37.69 and 41.78?
The pic is at the first post

I didn't say it would definitely work i was questioning would it make an improvement????

[shimmy]

Originally Posted by adem.csl

What???? If one has a 12cm outer diameter and one has a 13.3cm diameter where did you get 37.69 and 41.78?
The pic is at the first post

I didn't say it would definitely work i was questioning would it make an improvement????

Alex was talking about circumference Adem, the distance around the edge. You'd quote diameter which is straight across the pulley.

Iirc circumference = 2x pie x diameter/2 = 2 x 3.142 x 12/2= 37.69 (I'm exhausted now)

[shane@mbtech]

Originally Posted by uncle benz

Now I'm even more confused. The reverse of that you say...

So is that slow speed = warm, fast speed =hot

Or full speed = cool, low speed = cold.

To my mind there must be an optimum speed of coolant flow for a given size of radiator. Surely too slow will mean the coolant is cooled A LOT in the radiator, at the detriment of the coolant left in the engine which will peak much higher.
Too fast and it won't be cooled sufficiently by the radiator before being pushed back into the engine?
Where is the Gorilla when you need him???

It was more in response to shimmys quote about the time the coolant is in the radiator for.

If it's pushed through quicker then it's less likely to cool. That's why I likened it to electric shower, but opposite way round.

[uncle benz]

Originally Posted by lawsy

It was more in response to shimmys quote about the time the coolant is in the radiator for.

If it's pushed through quicker then it's less likely to cool. That's why I likened it to electric shower, but opposite way round.

Ahh, I get it now!

A bigger radiator has to be a better bet than messing with pulley sizes.

[shimmy]

Originally Posted by lawsy

It was more in response to shimmys quote about the time the coolant is in the radiator for.

If it's pushed through quicker then it's less likely to cool. That's why I likened it to electric shower, but opposite way round.

Yes, and I was saying (badly) that a bigger rad then will allow the water to cool more as it will stay in the rad longer even though it is flowing faster.

[Mike R]

Given how easy it is to reverse this, it should be very easy to test. Access the water temp menu so it is displayed in specific figures and carry out some measurements at a track day (noting ambient temp / barometric pressure changes through-out the day) and then repeat with the other pulley (even better if you can do this on the same day).

[adem.csl]

Originally Posted by shimmy

Alex was talking about circumference Adem, the distance around the edge. You'd quote diameter which is straight across the pulley.

Iirc circumference = 2x pie x diameter/2 = 2 x 3.142 x 12/2= 37.69 (I'm exhausted now)

Wicked cool im a monkey not a mathematician lol!
Thanks shimmy