| Author | Message | ||
| Jim Schad (Jim_schad)
Intermediate Member Username: Jim_schad Post Number: 1535 Registered: 7-2002 |
Maid cents two me the furst tyme. Why do people feel the need to point out spelling errors on a chat room? | ||
| DES (Sickspeed)
Senior Member Username: Sickspeed Post Number: 5259 Registered: 8-2002 |
LOL, Hugh - after reading that first post THREE TIMES, i still couldn't get it and gave up on it... i came back after a while and you sorted out the explanation, so i figured i'd recap...  | ||
| Hubert Otlik (Hugh)
Intermediate Member Username: Hugh Post Number: 1021 Registered: 1-2002 |
Yah, thanks for pointing that out, DES. | ||
| DES (Sickspeed)
Senior Member Username: Sickspeed Post Number: 5254 Registered: 8-2002 |
What...?!?!?
Yeah, no kidding...!
Ah... Now i got it... Thank you. | ||
| Tazio Nuvolari (Nuvolari)
Member Username: Nuvolari Post Number: 254 Registered: 9-2002 |
I agree the 91 M5 looked like it was running whitewalls. I loved the later wheels even if they were not air scoops. | ||
| James Glickenhaus (Napolis)
Intermediate Member Username: Napolis Post Number: 1971 Registered: 10-2002 |
Thanks! | ||
| Dave (Maranelloman)
Intermediate Member Username: Maranelloman Post Number: 2255 Registered: 1-2002 |
Tazio, it was the 1991 M5. The rims had an outer "lip" to catch the air & direct it inward that made the car look like it was running whitewalls. For that reason, the 1991 M5 did not sell well at all in the US... After that, they went to the "throwning star" 5-spoke wheels, which accomplished the same function w/o the whitewall lool.. | ||
| Hubert Otlik (Hugh)
Intermediate Member Username: Hugh Post Number: 1020 Registered: 1-2002 |
James: I follow what youre saying, but my explination was terrible. If you've got directional wheels acting as fans, than you can only use that wheel, on that hub, in that direction. Which also neccesiatates the use of one tire/wheel/tub and no rotation. That reasoning doesn't lend it self well to the general population, which is why the use of directional wheels isn't more prevelant. That's what I was trying to say, sorry. Wheels that act as fans: porsche 993 c2s/c4s/TT; 996 TT and GT 2; Mugen cf48's acted as cooling fins and as heat sinks to disappate heat outward; etc. | ||
| Tazio Nuvolari (Nuvolari)
Member Username: Nuvolari Post Number: 253 Registered: 9-2002 |
The BMW M5 had wheels that were designed to vent the brakes. I am not sure the exact year but it was the first production of the 'last' body style. | ||
| James Glickenhaus (Napolis)
Intermediate Member Username: Napolis Post Number: 1970 Registered: 10-2002 |
Hugh I realize that about directional tires but do you know of other wheels that act fans to extract air and cool brakes and are directional? | ||
| Jim Schad (Jim_schad)
Intermediate Member Username: Jim_schad Post Number: 1533 Registered: 7-2002 |
Think of the wheels on the late 80's vettes. Is that what you are talking about? | ||
| Hubert Otlik (Hugh)
Intermediate Member Username: Hugh Post Number: 1019 Registered: 1-2002 |
James- A good majority of "sports cars" have "directional" wheels; i.e., they should face a given way that allows them to work as designed. Passanger cars, sedans, and the more mundane people movers don't have this feature out of convienence; joe blow couldn't really come to grips with why he cant rotate his tires, buy all the same size tire, why he's got 4 "spares" in his trunk, and why his tire costs are triple that what his friends "non-directional" wheels toting car are. | ||
| James Glickenhaus (Napolis)
Intermediate Member Username: Napolis Post Number: 1969 Registered: 10-2002 |
I'm not sure why other wheels don't do this. Hugh? | ||
| DES (Sickspeed)
Senior Member Username: Sickspeed Post Number: 5250 Registered: 8-2002 |
The wheels actually create a sort of suctioning to be able to pull air through the brakes, thus cooling them...? Am i understanding this right...? If so, that's pretty phat... | ||
| James Glickenhaus (Napolis)
Intermediate Member Username: Napolis Post Number: 1968 Registered: 10-2002 |
The wheels on my MK-IV did that 36 years ago. The turbine wheels are right and left handed for that reason and extract air from the wheel well as well as pulling air through the brakes. | ||
| DES (Sickspeed)
Senior Member Username: Sickspeed Post Number: 5246 Registered: 8-2002 |
Hubert - warranty is void if i'm rollin' on dubs...? Mike, thank you -
- um... i'm not sure i understand. This was to cool them...? How were they pulling air through the brake ducts, over the rotors and such...? Did this help any...? | ||
| michaelthuber (Mikehuber)
Junior Member Username: Mikehuber Post Number: 77 Registered: 3-2003 |
DES, I know the Porsche 935 that a guy around here had came with wheels that doubled as impellers of a fan pulling air through the brake ducts, over the rotors, and out through the wheels. They were strange looking with a large diameter center "disc" and short slanted fins between the center disc and the wheel rim. Don't know if it was a "real" 935 or a conversion. It was black with the Interscope red, yellow, orange stripes running on the tops of the fenders. Enjoy California. Mike Huber | ||
| Hubert Otlik (Hugh)
Intermediate Member Username: Hugh Post Number: 1008 Registered: 1-2002 |
Mitch- Do you know that manufactures now are voiding warranties on SUV's (I hate that "term") if they "ride" in 20" wheels or larger. Darwin was right, I hope. | ||
| Mitch Alsup (Mitch_alsup)
Member Username: Mitch_alsup Post Number: 843 Registered: 4-2002 |
"The use of 19/20 inch wheels on sedans/SUVS and the like is utterly idiotic." You are giving them too much credit! | ||
| Hubert Otlik (Hugh)
Intermediate Member Username: Hugh Post Number: 1006 Registered: 1-2002 |
Material, weight, offset, etc. are all accounted for, but another factor (amongst which is aesthetic appeal; the wheels are a siginifcant part of the cars "look") is the spoke design. Some wheels are designed in a given fashion to provide ventilation to the brakes, and also to allow for the use of large piston/rotor setups; the inner spoke desgin is important here. This applies to sports/performance cars. The use of 19/20 inch wheels on sedans/SUVS and the like is utterly idiotic. | ||
| Jay Grande (Jay)
Intermediate Member Username: Jay Post Number: 1414 Registered: 10-2001 |
Pick up an aftermarket rim and then a OEM Ferrari rim. The weight differance is unbelievable! Ferrari rims are light. That is unless you are buying a top quality rim. I know the BBS aftermarkets for the 308 are lighter than the factory rims. Alot of guys use the BBS for track events. | ||
| Jim Schad (Jim_schad)
Intermediate Member Username: Jim_schad Post Number: 1522 Registered: 7-2002 |
I imagine the material, weight, width and diameter all are calculated to give best results, but the actual design style I have no idea. Also, on the 348's I never knew they had 4 seperate wheels. I thought the directional wheels were put on either side, but there are diff wheels. | ||
| DES (Sickspeed)
Senior Member Username: Sickspeed Post Number: 5209 Registered: 8-2002 |
Ok... So with all the thought and time and money and studying and scientific application that goes into DESigning Ferraris and their various parts, etc. - does any thought go into the rims...? Are they aerodynamically DESigned to, let's say, cool off brakes...? So much goes into making a sports car, i was just wondering if any thought goes into the rims... If so, what do you know about it... If not, how come...? |