Well from a performance perspective, every gram of unsprung weight that is saved, is a gain in agility as unsprung weight counts as a factor x compared to sprung weight savings. The less work an engine must perform to get the rotating mass turning, the better.
@msmarshall854
5 ай бұрын
Appreciate the discussion------I would LOVE to run some thinner lighter weight rotors, I'm aware that this reduces braking capabilities but for the type of daily driving I do, it's perfectly fine. With lighter weight wheels, it's a perfect weight reduction project.
@RBFR01
6 ай бұрын
The weight savings are literally grams, A 2 piece rotor is pointless on a street car but are really cool and they're a must have on a track car.
@brakestuff4784
5 ай бұрын
It's more than grams...as I showed the savings is about 1-2lbs. That's not nearly the weight savings advertised by vendors...because they are taking the weight out of the heat capacity of the rotor ring. I wouldn't go as far to say 2-piece rotors are pointless for a street car, there are still benefits. Still it's hard to disagree with you...for most cars, for most people...you're probably right.
@matthewmoore661
Жыл бұрын
Thanks for the vid. If the price is comparable, I would choose to save 2-4 lbs; maybe as rotational inertia goes there might be a multiplier affect for acceleration or deceleration? I don’t know, can’t remember the inertia equations. Your next vlog is on low friction hub bearings, if they exist?
@LordZaleeping
Жыл бұрын
Great information! Thanks.
@up_indust
Жыл бұрын
Cool, glad it was useful!
@gearhead1308
2 жыл бұрын
The video I was looking for still have a question, doesn't the slotting and drilling the rotors improve heat exchange as more air is exposed to rotors?
@brakestuff4784
2 жыл бұрын
Hi, thanks for watching. Slotting and drilling can be opening a can of worms, there are conflicting views and data on the benefits. To be brief some testing shows drilled holes can improve the air flow and heat transfer from the rotors. In practical terms though you'd probably choose holes or no holes based on the looks, and if you will use the rotors on a track or racing. Generally rotors with cross driled holes end up cracking under hard use and you replace them more often. Slots on the other hand, are on the face of the rotor and don't appreciably affect the venting and hence don't have a particular benefit to heat transfer. Both slots and holes primarily have the benefit of creating an edge on the surface of the rotor that digs into the pad a bit, keeping the surface fresh. The effect is more "bite" on the rotor, that initial braking force as you jump on the pedal, and also this effect keeps the pad surface free of glazing. Secondarily water is flushed from the surface quicker. These things are useful in race cars. Usually slots are used over holes becuase they simply are more durable rotors. Some of those benefits you might want on your street car too. Note there are downsides as there always are sacrifices. Slotted and drilled rotors, will wear the pads a little quicker, and they make a little noise, a humming as you slow down, particularly slotted rotors do. You may care about this or no big deal. Some high performance cars come with slotted rotors from the factory, but I recently noted most Cadillac V-series with their large Brembo brakes do not, probably they figure the customer won't like humming noises. Many cars come with drilled rotors simply becuase the marketing dept insists. So it's your choice of course. Hope that helps!
@monkeyzer0
6 ай бұрын
Did I hear right, the 1-piece was 245mm and the 2-piece was 270mm? Did you account for that? Assuming both were 245, there would be a bigger weight savings…if someone responds, I’ll post the math.
@brakestuff4784
5 ай бұрын
That is mostly correct, the compared rotor is 345mm and the 2-piece is a 370mm rotor. Both rotors are for the same application, i.e. they fit the same hub. The only thing being compared is the weight of the rotor "hat" here, not the friction ring portion of the rotor. It's just an example but IMO the point is made: there is only a couple pounds at most to be saved in changing the construction of the rotor to 2-piece style. Any other weight savings claimed, is taken out of the heat capacity of the rotor ring. That's fine for race cars, not always good, potentially unsafe, for street cars.
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