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Klasse Act
Hard-core CEG'er

Reged: 05/28/00
Posts: 9196
Loc: Macomb Township MI USA
Solid rear rotors, why?
#1061237 - 09/28/05 04:11 PM

I posted this question over in the Crossfire forum w/o much sucess, so I thought I'd run it past you gurus, especially if your an SCCA guy. Why would a manufacturer run solid rear rotors instead of vented ones Is there an advantage to this or what? Thanks guys

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"THEE" Roger R
USMondeo@aol.com
2005 Crossfire Limited coupe'
-FOR SALE @buyout price & I'll...
-throw in my 93' Regal as winter car
*Dragon Run 06'...Oct 12-15th*
Puur-fection Auto Detailing
Complete packages from $140.00

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Phil Rohtla
Hard-core CEG'er

Reged: 03/26/02
Posts: 1399
Loc: Ottawa, Ontario, Canada
Re: Solid rear rotors, why? new
#1061242 (Re: Klasse Act) 09/28/05 04:15 PM

Given that most of the braking "work" is done by the fronts, and the heat sink needs are therefore less for the rear rotors, most manufacturers will go with the solid (as in non vented) rotors because it is cheaper.

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98 Silver Frost SVT
97 BMW 540I Sport, six speed

"Blue is for sky, black is for soil, and white is for simplicity, purity and hope for the future"

"A coveted car should never stunt your life, but should make it more rich and interesting."

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DemonSVT
Hard-core CEG'er

Reged: 09/13/00
Posts: 9602
Loc: KC, MO
Re: Solid rear rotors, why? new
#1061281 (Re: Phil Rohtla) 09/28/05 04:53 PM

Originally posted by Phil Rohtla:
most manufacturers will go with the solid (as in non vented) rotors because it is cheaper.




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2000 SVT #674
13.47 @ 102 - All Motor!

It was not broke; Yet I fixed it anyway.

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RaraAdministrator
"Absolut Rara."

Reged: 09/09/00
Posts: 3223
Loc: Westland, MI
Re: Solid rear rotors, why? new
#1061298 (Re: DemonSVT) 09/28/05 05:12 PM

yup, you run the cheapest you can that will still meet the performance requirements. Front engine cars, combined with production friction material, means that not much braking work is done by the rears, meaning not much thermal mass is required, which means less cooling is necessary.

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Balance is the Key.

rarasvt@comcast.net

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Klasse Act
Hard-core CEG'er

Reged: 05/28/00
Posts: 9196
Loc: Macomb Township MI USA
Re: Solid rear rotors, why? new
#1061340 (Re: Rara) 09/28/05 05:55 PM

Thanks for the info guys, its about the same info I got on the Crossfire forum. I just don't get why Ford did this with the Contour, but Chrysler didn't with this car. You'd think you'd want every advantage with a sports car. I'll find out how they hold up when I go to the Dragon in a couple weeks

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"THEE" Roger R
USMondeo@aol.com
2005 Crossfire Limited coupe'
-FOR SALE @buyout price & I'll...
-throw in my 93' Regal as winter car
*Dragon Run 06'...Oct 12-15th*
Puur-fection Auto Detailing
Complete packages from $140.00

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GoldenTour
CEG'er

Reged: 09/21/04
Posts: 157
Loc: Pomona, CA
Re: Solid rear rotors, why? new
#1061358 (Re: Klasse Act) 09/28/05 06:12 PM

i thought the rears were vented on our cars?

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~Crystian

2000 Se sport
2001 Lightning(Sorry!your mom cant come with us)

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RogerB
Hard-core CEG'er

Reged: 10/21/00
Posts: 3867
Loc: Wichita, KS
Re: Solid rear rotors, why? new
#1061412 (Re: GoldenTour) 09/28/05 07:08 PM

I think he meant that the Crossfire has non-vented rear disks, which I find surprising.

Although, I will also suggest that you get away with not only the cheapest setup, but the lightest you can afford. I'd think the solid rotors would be a tad lighter than the vented discs, having less material overall, but probably cost is the primary concern.

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Function before fashion.
'96 Contour SE

"Toss the Contour into a corner, and it's as easy to catch as a softball thrown by a preschooler." -Edmunds, 1998

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Todd TCE
CEG'er

Reged: 03/19/02
Posts: 337
Re: Solid rear rotors, why? new
#1061836 (Re: RogerB) 09/29/05 01:41 AM

Can you say "cost effective"?

That and it gives the car owners something to figure they need and guys like us something to make work. The SHO went through this and still I'm amazed at the owners who work so hard to get the early vented ones for a common street application.

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Less Bling, more Zing
Todd/TCE
www.tceperformanceproducts.com

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Big Jim
Hard-core CEG'er

Reged: 09/03/00
Posts: 4693
Loc: Thousand Oaks, California, USA
Re: Solid rear rotors, why? new
#1061839 (Re: RogerB) 09/29/05 01:44 AM

The Crossfire is really Benz in Chrysler badging. It is very common for the europeans to use larger solid rear rotors instead of smaller vented ones.

Ford uses solid rear rotors on the Expedition. I don't remember clearly, but it seems like the Exp[lerer as well. The rotors on the Expedition (and Lincoln Navagator as well) are very hard, much harder than anything else Ford is using. They are very hard to wear out and they can be difficult to machine as they chatter like hell and leave a hearingbone chatter pattern if turned too agresively.

If more rotors were made as hard, their would be a lot less rotor wear complaints.

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Jim Johnson
98 SVT
03 Escape Limited

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Klasse Act
Hard-core CEG'er

Reged: 05/28/00
Posts: 9196
Loc: Macomb Township MI USA
Re: Solid rear rotors, why? new
#1062334 (Re: RogerB) 09/29/05 03:29 PM

Originally posted by RogerB:
I think he meant that the Crossfire has non-vented rear disks, which I find surprising.

Although, I will also suggest that you get away with not only the cheapest setup, but the lightest you can afford. I'd think the solid rotors would be a tad lighter than the vented discs, having less material overall, but probably cost is the primary concern.




Right, my car has solid rear rotors I can understand this, but then again, why not just make them big and vented, how much more can this really cost


Todd at TCE, you got SS lines for this car and a suggestion for brake pads. These things dust up real bad and although I don't auto-X the car, I do some "spirited" driving from time to time and like to go down to the Dragon once a year, so anything that would make my car brake even better than it does now would be great, thanks Todd

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"THEE" Roger R
USMondeo@aol.com
2005 Crossfire Limited coupe'
-FOR SALE @buyout price & I'll...
-throw in my 93' Regal as winter car
*Dragon Run 06'...Oct 12-15th*
Puur-fection Auto Detailing
Complete packages from $140.00

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Barge
Hard-core CEG'er

Reged: 04/04/02
Posts: 1695
Loc: Durka Durkastan
Re: Solid rear rotors, why? new
#1062391 (Re: Klasse Act) 09/29/05 04:06 PM

Automotive companies spend tons just to save pennies on parts... and I'm sure the casting for a vented rotor is at least a moderate amount more expensive than solid.

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04 Subaru WRX "Eurosport bling bling fast and furious tokyo drift"
"They have diarrhea of the mouth, and constipation of thought"

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Auto-X Fil
Hard-core CEG'er

Reged: 08/11/03
Posts: 4140
Loc: Pennsylvania
Re: Solid rear rotors, why? new
#1062739 (Re: Klasse Act) 09/29/05 09:07 PM

Originally posted by The EX- Striped SVT:
I can understand this, but then again, why not just make them big and vented, how much more can this really cost




Assume $5 per rotor cost to Ford - a severe underestimation, I'm sure, but I'd rather err on the side of caution.

One million cars with rear disks.

$10 million dollars to Ford.

See? Pennies make a difference! $0.02 cheaper per seatbelt buckle? $100,000 for Ford.



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-Philip Maynard
'95 Contour [71 STS | Track Whore]
'97 Miata [71 ES | Boulevard Pimp]
2006 autocross results

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MxRacer
Addicted CEG'er

Reged: 02/01/04
Posts: 7392
Loc: pony heaven
Re: Solid rear rotors, why? new
#1062787 (Re: Auto-X Fil) 09/29/05 10:34 PM

Originally posted by Auto-X Fil:
Originally posted by The EX- Striped SVT:
I can understand this, but then again, why not just make them big and vented, how much more can this really cost




Assume $5 per rotor cost to Ford - a severe underestimation, I'm sure, but I'd rather err on the side of caution.







under? my guess would be overestimation.

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02 Mustang GT... Tuned by Nelsons. Low 12's, anyone?


.....______
___|______\_____
|/-\_________/-\_|
.\_/...............\_/

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Auto-X Fil
Hard-core CEG'er

Reged: 08/11/03
Posts: 4140
Loc: Pennsylvania
Re: Solid rear rotors, why? new
#1062807 (Re: MxRacer) 09/29/05 11:10 PM

A hollow casting is going to be a lot more. 2x the metal, more expensive machines, and more labor. But fine, say $0.50. It's still $1M.

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-Philip Maynard
'95 Contour [71 STS | Track Whore]
'97 Miata [71 ES | Boulevard Pimp]
2006 autocross results

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Kremithefrog
I have no life

Reged: 05/14/02
Posts: 21653
Loc: Albany, Georgia
Re: Solid rear rotors, why? new
#1062808 (Re: Klasse Act) 09/29/05 11:11 PM

Hey Roger, here is an interesting read.

http://www.nsxprime.com/FAQ/Performance/brakelines.htm

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98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)

FS: SVT rear sway bar
WTB: Very cheap beater

CEG Dragon Run - October 13-15

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Klasse Act
Hard-core CEG'er

Reged: 05/28/00
Posts: 9196
Loc: Macomb Township MI USA
Re: Solid rear rotors, why? new
#1062809 (Re: Auto-X Fil) 09/29/05 11:11 PM

Its a wonder the cars are as good as they are to begin with

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"THEE" Roger R
USMondeo@aol.com
2005 Crossfire Limited coupe'
-FOR SALE @buyout price & I'll...
-throw in my 93' Regal as winter car
*Dragon Run 06'...Oct 12-15th*
Puur-fection Auto Detailing
Complete packages from $140.00

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