Pdlewis
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| posted on 8/11/06 at 09:31 PM |
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Breaks Vented?
Hi,
I currently have solid sierra discs on the front and drums on the back. Im happy with the drums but have just upgraded from a 1600 to a 2.1 so wasnt
sure if i should upgrade to vented disc on the front.
If it is worth upgrading do i just need new calapers and discs or is it a bit more complex?
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flak monkey
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| posted on 8/11/06 at 09:35 PM |
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Stick with solid, they are lighter, unless you are having problems with the brakes overheating, which i doubt you are...
David
Sera
http://www.motosera.com
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Pdlewis
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| posted on 8/11/06 at 09:37 PM |
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No issues with overheating just wasnt sure if i would get any benifit from vented
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mookaloid
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| posted on 8/11/06 at 10:04 PM |
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Vented discs don't improve braking - they allow better cooling and therefore put off the time when brake fade appears.
On our cars, there is loads of airflow around the wheels so it is unlikely that brake fade will be a problem even with spirited driving
Cheers
Mark
"That thing you're thinking - it wont be that."
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PeterW
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| posted on 8/11/06 at 10:08 PM |
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Will a Sierra non vented caliper fit on the vented caliper mount..?
And I assume a non vented disk will fit a vented hub...?
Cheers
Peter
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StevieB
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| posted on 9/11/06 at 10:37 AM |
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The calipers are different sizes.
You shouldn't need vented discs as it's all about mass v velocity v friction etc., and nothing to do with engine size/power.
Your 2.1 pinto se7en should still be a lot lighter than the 1.6 sierra that the solid discs have come from, so should be fine
If you want better breaking performance, you'd be better off just getting some decent pads
[Edited on 9/11/06 by StevieB]
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quadra
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| posted on 9/11/06 at 10:47 AM |
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quote:
Originally posted by StevieB
The calipers are different sizes.
You shouldn't need vented discs as it's all about mass v velocity v friction etc., and nothing to do with engine size/power.
I don't necessarily agree with that, if you have two cars that are the same weight but one has an engine that is twice the power (and as a
general rule of thumb CC's equlas more power, especially if you are American), then on any given straight bit of road you will be able to
achieve a much higher speed and therefore the retardation required before the next corner will be higher which will generate more heat.
Cheers Mike
You don't need eyes to see, you need vision!
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NS Dev
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| posted on 9/11/06 at 10:56 AM |
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But on most sevens solid discs will be fine. If the weight gets up to the high 600kg - 700kg mark then vented ones may well be useful.
As was mentioned, get some decent pads in it.
In my opinion, humble as that is, there is only one choice of pad for road use and that is the Mintex 1144 compound, forget the other variants,
including various strangely coloured items, the mintex ones are superb.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Bob C
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| posted on 9/11/06 at 10:57 AM |
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It's right by my reckoning too. On maximum go, you should be accelerating at full power or braking fully (this is my simple world - bear with
me....) If we assume then that you're 50% of the time accelerating and 50% of the time braking then the brakes have to dissipate half the rear
wheel horsepower.. car weight doesn't come into the equation!
That's the "fade" side of the problem (average dissipation), there are other issues: consider a sudden stop from high speed - the
resulting thermal shock in the discs, in the light car (with low top speed) will be much less stressful on the discs than the original tintop
Bob
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iank
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| posted on 9/11/06 at 10:58 AM |
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quote:
Originally posted by quadra
quote:
Originally posted by StevieB
The calipers are different sizes.
You shouldn't need vented discs as it's all about mass v velocity v friction etc., and nothing to do with engine size/power.
I don't necessarily agree with that, if you have two cars that are the same weight but one has an engine that is twice the power (and as a
general rule of thumb CC's equlas more power, especially if you are American), then on any given straight bit of road you will be able to
achieve a much higher speed and therefore the retardation required before the next corner will be higher which will generate more heat.
Cheers Mike
If you read carefully he said that - "mass v velocity v friction"
Edit - quoting fixed
[Edited on 9/11/06 by iank]
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JoelP
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| posted on 9/11/06 at 12:35 PM |
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quote:
Originally posted by Bob C
It's right by my reckoning too. On maximum go, you should be accelerating at full power or braking fully (this is my simple world - bear with
me....) If we assume then that you're 50% of the time accelerating and 50% of the time braking then the brakes have to dissipate half the rear
wheel horsepower.. car weight doesn't come into the equation!
That's the "fade" side of the problem (average dissipation), there are other issues: consider a sudden stop from high speed - the
resulting thermal shock in the discs, in the light car (with low top speed) will be much less stressful on the discs than the original tintop
Bob
IMHO, you are on the right tracks, however its not a totally linear relationship as the lighter car will accelerate faster and loose more of the total
work output of the engine to drag, hence the front brakes dont do all the work themselves. 
Get yourself some mintex pads, you wont notice fade anyway. Not saying that others do fade, but mintex definately dont even on track at speed.
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NS Dev
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| posted on 9/11/06 at 12:42 PM |
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did you use the mintex's on your track machine Joel? If so, they are rather good aren't they!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Stu16v
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| posted on 9/11/06 at 10:00 PM |
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quote:
Originally posted by CaLviNx
Hi
Some (like me) are thinking of going from vented to solid discs, I feel that with the weight of a "7" you just wont get enough heat into
the vented setup to make it work 100% so methinks a set of willwoods and solid discs is next in line to be fitted.
Others (like me) wouldn't of bothered fitting them in the first place...
Possibly something like a Dax Quadra with a stonking engine would make use of vented discs. Fast, and not the lightest sevenesque ever built. But for
the rest of us, solids will do just fine.
As for pads, as Nat et all say, Mintex 1144 are damn fine - but they *can* be overcooked on a track. Swap em for Ferodo 2500's however, and your
problems have gone forever...
Dont just build it.....make it!
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