A few pictures of the rotors going in. And a reason for concern. First the pictures:

The rear wheel rotor. The red ring you see is a hub adapter for the mugen wheel (only required for the rear wheels)


The front rotor:


The front rotor sideways:


If you look closely at the picture above the channels between the discs make an arch instead of being straight as in the standard rotors. On this side, they are facing the right direction, that is, as the wheel turns they tend to suck air in.

Unfortunately, there appears to be only a single type of front rotor, and so on the other side of the vehicle they face the other way round. In this picture that I've taken from the Spoon site itself this matter can be easily seen:

Picture from the back of the rotors (front on the left:


I wonder if this is of no practical consequence. I have sent an e-mail to Spoon but they do not reply. The guys I've bought the rotors from would not have a clue.

Any suggestions? Is anyone familiar with this type of ventilated rotor? Are they usually directional, ie, different rotors for the left and right wheel? Any suggestions on how to get tech support from Spoon will be welcome.

Other items of interest:
These rotors weigh the same as stock minus the holes... a few grams, no more. To save unsprung weight you have to go for aluminium calipers (or borrow a set of ceramic rotors from your neighbours porsche..!)

The dealer is doing it. He is also painting the calipers (black) and installing the goodrich braided lines. Other things are going in the car and some are being considered (JR air filter, Bilstein shocks, Brembo brake pads). Unfortunately I will not be able to pick it up before saturday.


[This message has been edited by Luis (edited October 11, 2000).]

 

I guess one side cools best going forward and the other when in reverse..

Actually I think the vanes are simply to radiate heat and don

 

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by cdelena:
[B]Actually I think the vanes are simply to radiate heat and don

 

Wow Luis! That scale says your car weighs 2500kg . That's really light!

 

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by CoralDoc:
Wow Luis! That scale says your car weighs 2500kg . That's really light!

[/quote]

That's because I was sitting on the car...

 

I

 

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by cdelena:
[B]I

 

The rotors aren't spinning very fast, but I would expect the major airflow would be be caused by the centrifugal effect. That is, air inside the rotors vent would try to go in a straight line and as a result of the fins inside the rotor, it would have a tendency to move from the inside to the outside.

If the fins inside the rotor are raked in the same direction, one side would be helping the airflow, and one hindering it. This is not good. Any benefit as a result of ventilation would be increased on one side and negated on the other.

I know that there are some rotors which are directional and others which are unidirectional but I thought this had more to do with slot patterns. The DBA's are unidirectional. There's a pretty good FAQ here: http://www.dba.com.au/gold-faq.htm

 

Wow, 13 times/sec seems pretty fast to me...and that's at only 50mph

 

For what it's worth, I just bought a set of Brembo drilled rotors for my M3. They are indeed directional as the left pattern is the opposite of the right pattern. When the guys were installing them, I noticed the pattern on the right front rotor was facing the "wrong" way. The guy argued that either direction would be fine, but not trusting him too much, I checked the boxes they came in and they did indeed say "left" and "right", for the different rotors. So I had them swap them. Now they all face the correct direction, however it is the opposite direction of the rotor in pic #3 above, so only the left side of Luis's car will be facing the direction used by Brembo. I've noticed I have the same pattern as some OEM Porsche drilled rotors.

Here's a pic of the left side of a racing Spoon S2000 and you can see the holes go in the same direction as your right side rotor.



Here are two rotors with calipers, and they appear to be left and right calipers but with the same pattern on both rotors So maybe the drill pattern is the same for both l and r rotors! Confusing!



Good luck Luis!