SPL brake cooling deflectors

[Infinitiguy19]

I know some people on here have SPL adjustable tension rods but have the people that have them installed the SPL brake cooling deflectors?

Do they make any sort of difference or does SPL just try to get more money out of people?

http://www.splparts.com/SPL_TRSBD.html

[Q45tech]

Since everyone leaned how to calculate rotor temperature rise per second in a single panic stop in previous posts, calculating the convection cooling vs speed per second should be almost as easy.
"Rotor rotational speeds of 342, 684, and 1025 [rpm] yielded fin convection heat transfer coefficients of 27.0, 52.7, 78.3 [W m−2 K−1], respectively, indicating a linear relationship. At the slowest speed, the internal convection represented 45.5% of the total heat transfer, increasing to 55.4% at 1025 [rpm]."

https://ir.library.dc-uoit.ca/bitstream ... thesis.pdf

Obviously the faster the velocity the better ducts and deflectors work, especially when you are only down to 100 mph in the apex of a curve

[elwesso]

man thats some good stuff there, brings back some wonderful memories of heat transfer class!

[Infinitiguy19]

Thank you for the interesting read. I am surprised I could understand the PDF, Not even close to understanding your post though Tech. Hopefully when done with the 118 Page PDF I will have a better understanding.

[Q45tech]

The point is a single panic stop from 60 mph only raises the front rotor from 100F to maybe 250F in 3 seconds driving a steady 60 mph afterwards will fully cool the rotor back to 100F in a minute or 2.

Coming down a curvy mountain requires a slow speed therefore ducts or deflectors are useless.Roadracing at 150 mph is an entirely different case where ducts and deflectors can help. Even 120 mph might show some improvements.

[yodawill2000]

Short track Nascars use two ducts with high velocity fans.
One for the inner tire bead and the other for the rotor.
Watch a night race and you will see why.
And the rotors they use DWARF ours.
Still glow bright red through the turns.
Excellent link up there Mr Tech.
Very informative as to pole vs. Vane rotors.

[Infinitiguy19]

Hey Q45Tech I want to thank you because you kept saying us NICO members should take college courses to learn the answers to our questions. Well I am doing just that: http://ocw.mit.edu/OcwWeb/Mechanical-En ... /index.htm.

There are many topics all FREE and there for you all to learn!!!

And thanks for dummying down your previous answer.

[Q45tech]

Over the winter, I spent over 300 hours watching Stanford's Susskind' Physic Lectures recently as an update after a cram course refresher [400,000 utube views]:
http://www.youtube.com/watch?v=6ysbZ_j2xi0

http://bethe.cornell.edu/
http://oyc.yale.edu/economics/financial-markets
http://itunes.apple.com/podcast/uctv-ga ... d153364707