GROUP BUY - Oil Cooler?

[Mike R]

Originally Posted by trackm3

let me get the figures from a few Kumho races as I have one fitted to Richard Bacons race car

Is this a twin pass in the same way that the Bimmerworld one works (as in the hot oil runs through the back of the cooler first)?

[trackm3]

Mike, why do them there yanks do that ?
mine works as per the std cooler,so you have the inlet which is either the top or bottom then split into an upper and lower section then out through again either the top or bottom, so the whole depth of the radiator is cooling the hot oil ?

[Mike R]

Originally Posted by trackm3

Mike, why do them there yanks do that ?
mine works as per the std cooler,so you have the inlet which is either the top or bottom then split into an upper and lower section then out through again either the top or bottom, so the whole depth of the radiator is cooling the hot oil ?

It works more efficiently on a deep oil cooler.

As the air passes through a deep oil cooler, the air heats up in the heat exchange process, which means that the oil at the back of the cooler isn't cooled as efficiently (due to the rise in temp of the air above ambient) which means the overall temperature reduction isn't as good.

By making it twin pass, the oil coming out of the engine runs through the core that is at the back of the cooler, and despite being only cooled by the warm air, because it is at a high temp, the warm air is still sufficient to reduce the temps by a reasonable amount. It then runs through the core that is at the front of the cooler, which is cooled by ambient air, which then drops the temp further. What this set up achieves is that ALL the oil is reduced to a set temperature.

Your arrangement will have a mixture of hot oil and warm oil, which will keep the temp higher. This is why normal air to air coolers are thin with a large surface area (but this creates packaging issues).

[trackm3]

Mike, the Americans have done a good marketing campaign on that then, I would need to do a proper comparison to be sure on this one so I may well order one just to do a test as my guy can easily change that he just does my type on all his applications even on current BTCC cars, the race car we run it on used to run up to the top mark on the temp guage now it runs between 1/2 and 3/4 which they are happy with

Originally Posted by Mike R

It works more efficiently on a deep oil cooler.

As the air passes through a deep oil cooler, the air heats up in the heat exchange process, which means that the oil at the back of the cooler isn't cooled as efficiently (due to the rise in temp of the air above ambient) which means the overall temperature reduction isn't as good.

By making it twin pass, the oil coming out of the engine runs through the core that is at the back of the cooler, and despite being only cooled by the warm air, because it is at a high temp, the warm air is still sufficient to reduce the temps by a reasonable amount. It then runs through the core that is at the front of the cooler, which is cooled by ambient air, which then drops the temp further. What this set up achieves is that ALL the oil is reduced to a set temperature.

Your arrangement will have a mixture of hot oil and warm oil, which will keep the temp higher. This is why normal air to air coolers are thin with a large surface area (but this creates packaging issues).

[northernjim]

Originally Posted by trackm3

Mike, the Americans have done a good marketing campaign on that then, I would need to do a proper comparison to be sure on this one so I may well order one just to do a test as my guy can easily change that he just does my type on all his applications even on current BTCC cars, the race car we run it on used to run up to the top mark on the temp guage now it runs between 1/2 and 3/4 which they are happy with

When you think about it Martin, the twin pass design makes the oil pass thru twice the length of radiator than a normal one does- it also halves the depth, so like mike says - it is a more efficient, if more complicated design. Back to back test results would be interesting to see.

Can your man make a twin pass that isn't exhorbitantly expensive?

[trackm3]

There all twin pass Jim, mine passes along the top section then the lower section to the outlet, there one passes the rear first then the front section snd out, I don't see there's much if any difference ? We can make a smaller cooler cheaper but the core we use is horendously expensive

Originally Posted by northernjim

When you think about it Martin, the twin pass design makes the oil pass thru twice the length of radiator than a normal one does- it also halves the depth, so like mike says - it is a more efficient, if more complicated design. Back to back test results would be interesting to see.

Can your man make a twin pass that isn't exhorbitantly expensive?

[Mike R]

I've sent off an enquiry to the Bimmerworld guys - does anyone want to tag on to this?

[sydown]

I would be interested in an oil cooler, obviously dependent on price, at the advertised price on Bimmerworld.com it works out to over £800 on the doorstep which is a bit too steep for me!!
(£563.19 + P&P (66.50) + customs duty (I guess 7%) + VAT)

[0-60Motorsports]

Guys, i can speak to James at BW and see if we can arrange a group buy for you? would need to know how many people are genuinely interested first though.

[adem.csl]

Im interested if the price is right!