oadamo
|
| posted on 12/2/10 at 06:05 PM |
|
|
front or rear
whats the advantage or disadvantage of having the brake caliper on the front or back of the disc. most raod cars have them on the front but cars like
the lotus elise have them on the back ?
adam
|
|
|
|
|
r1_pete
|
| posted on 12/2/10 at 06:11 PM |
|
|
I thought it was for cooling, but if the sporty little number has them at the back it rather defeats that argument.
Maybe its to be opposite to the steering rack??
|
|
|
speedyxjs
|
| posted on 12/2/10 at 06:14 PM |
|
|
quote:
Originally posted by r1_pete
Maybe its to be opposite to the steering rack??
No, mine are on the same side as the rack.
Mine are all to the rear (not sure about the Astra though).
How long can i resist the temptation to drop a V8 in?
|
|
|
r1_pete
|
| posted on 12/2/10 at 06:24 PM |
|
|
Now you got me wondering, THIS seems like a plausable explanation...
|
|
|
Alan B
|
| posted on 12/2/10 at 06:40 PM |
|
|
I though fronts behind and rears in front was best to put them closer to COG and hence reduce the PMOI.
|
|
|
oadamo
|
| posted on 12/2/10 at 06:41 PM |
|
|
quote:
Originally posted by r1_pete
Now you got me wondering, THIS seems like a plausable explanation...
good find has anyone got a book or somthing about brakes they could have a look in to see what it says about the position.
adam
|
|
|
JekRankin
|
| posted on 12/2/10 at 06:50 PM |
|
|
It can have an affect on wheel bearing loads under braking.
An explanation, (pinched from Racecar Engineering) is on the fourth post of this thread.
link
I find it quite hard to follow! :-)
Jek
|
|
|
Angel Acevedo
|
| posted on 12/2/10 at 06:55 PM |
|
|
PMOI
It is desirable to have then as close to the CoG to reduce PMoI.
This within packaging constraints.
AA
DOH Too late
Beware of what you wish.. for it may come true....
|
|
|
meany
|
| posted on 12/2/10 at 08:56 PM |
|
|
quote:
Originally posted by JekRankin
It can have an affect on wheel bearing loads under braking.
An explanation, (pinched from Racecar Engineering) is on the fourth post of this thread.
link
I find it quite hard to follow! :-)
Jek
an extract from the above link, which i find hard to believe...sounds like a load of tosh to me. 
We can think of it like this: Gravity acts downward on the car, with additions and subtractions due to inertia effects and aerodynamic effects. The
road surface holds the car up. Or, we may say the road holds the tire up; the tire holds the wheel up; the wheel holds the hub up; the hub holds the
bearings up; the bearings hold the spindle up; the spindle holds the upright up; the upright holds the suspension up; the suspension holds the sprung
mass up. If the caliper exerts an upward force on the upright and a downward force on the disc, that just means the brake is helping the bearings and
spindle hold the upright up. It doesn't change the total support force, only the load path within some of the unsprung components.
|
|
|
britishtrident
|
| posted on 12/2/10 at 10:47 PM |
|
|
The angular position of the front calipers on production cars is a lot more to do with steering rack location than reaction forces at the wheel
bearing.
With the rear calipers the main consideration is available physical space and the design of hanbrake linkage/cable.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
|
|
|
