Mike B Posted August 7, 2008 Share Posted August 7, 2008 I fitted these disks according to Rotora's instructions, (the L and R fitment - ie direction of fins and slats) but to be honest I am now convinced that they are completely clueless... just repackaged and remarketed exsiting components from a marketing company... Spoke to a good friend who preps rally cars (to an international level) - he said I have them on the wrong way round, which explains why I have cooling issues. can you have a look at the pics and tell me if you think he's right and Rotora is wrong.. or vice versa... Quote Link to comment Share on other sites More sharing options...
JustGav Posted August 7, 2008 Share Posted August 7, 2008 If my perspective on the pictures is correct, they are the wrong way round.. The grooves should push gasses and material towards the outside of the disc when the wheels are rotating. It looks at the mo that they are pushing towards the centre of the hub. Also the fins need to pull the air into the disc rather than blow past. Quote Link to comment Share on other sites More sharing options...
ADL Mark Posted August 7, 2008 Share Posted August 7, 2008 I've seen instructions with discs before that say to install them as you have, but I can never see the logic behind it? As Gav says, the grooves should pull dust and gases away and obviously the vents pull air in to cool it. Quote Link to comment Share on other sites More sharing options...
JamieP Posted August 7, 2008 Share Posted August 7, 2008 Front driver on the monaro. yours look right to me. Quote Link to comment Share on other sites More sharing options...
Mike B Posted August 7, 2008 Author Share Posted August 7, 2008 Also the fins need to pull the air into the disc rather than blow past. This is the main issue perhaps... I wouldn't put it past rotora to put the fins and grooves the wrong way round!!! Jamie; you have any idea wether the internal fins pull air into the disk or push it out from the centre? Hopefully CW will be along soon...? Quote Link to comment Share on other sites More sharing options...
Alex Posted August 7, 2008 Share Posted August 7, 2008 (edited) The grooves on the outside don't matter....it's the fins inside that do. The grooves just allow brake pad gas to escape. IMO, The fins should be gulping air in the direction the car is going in. But as proved later in this thread it's the exit of the air that's more important than the entry, which also stands to reason... Edited August 8, 2008 by Alex (see edit history) Quote Link to comment Share on other sites More sharing options...
ShamelessTT Posted August 7, 2008 Share Posted August 7, 2008 I fitted these disks according to Rotora's instructions, (the L and R fitment - ie direction of fins and slats) but to be honest I am now convinced that they are completely clueless... just repackaged and remarketed exsiting components from a marketing company... Spoke to a good friend who preps rally cars (to an international level) - he said I have them on the wrong way round, which explains why I have cooling issues. can you have a look at the pics and tell me if you think he's right and Rotora is wrong.. or vice versa... 2bh ive just fitted some vented ktec racing discs on my Clio i hope yours are right as mine are going the same way....... Whats those washers about tho? on the lugs Quote Link to comment Share on other sites More sharing options...
Mike B Posted August 7, 2008 Author Share Posted August 7, 2008 IMO, The fins should be gulping air in the direction the car is going in. so the fins are pulling air in on the forward travelling section of disc? Whats those washers about tho? on the lugs They are just there bolting the disk on tight when the wheel was off.. I was chacking for warp and testing the alighnment of the caliper. Quote Link to comment Share on other sites More sharing options...
ADL Mark Posted August 7, 2008 Share Posted August 7, 2008 Front driver on the monaro. yours look right to me. Jamie, if that's the drivers side of your car then it's pointing in the same direction as we're saying it should. And from the pictures in the first post, they're the opposite way round which is wrong. Quote Link to comment Share on other sites More sharing options...
Guest Garfy Posted August 7, 2008 Share Posted August 7, 2008 The grooves on the outside don't matter....it's the fins inside that do. The grooves just allow brake pad gas to escape. IMO, The fins should be gulping air in the direction the car is going in. thats my understanding to Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 7, 2008 Share Posted August 7, 2008 The right hand picture should be the LR disc Quote Link to comment Share on other sites More sharing options...
Scott Posted August 7, 2008 Share Posted August 7, 2008 The discs are on the right way around Quote Link to comment Share on other sites More sharing options...
Scott Posted August 7, 2008 Share Posted August 7, 2008 The right hand picture should be the LR disc The discs are on the right way around Erm yeah, from that perspective lol. Quote Link to comment Share on other sites More sharing options...
Mike B Posted August 7, 2008 Author Share Posted August 7, 2008 The right hand picture should be the LR disc Thanks Chris, just to interpret this correctly; The right hand picture in the first post, (both pics show the same hub incidentally) should be the Left Rear disk... In which case the hub I am showing you is the LF (Left Front), so they are actually on the right way round, and the motion of the wheel should have the disk vanes blow air from the centre of the disk to the outside of the disk...?... I assume... Quote Link to comment Share on other sites More sharing options...
DodgyRog Posted August 7, 2008 Share Posted August 7, 2008 (edited) So is the disc on the wrong way:blink: Sorry for the hijack, but worried now:( Edited August 7, 2008 by DodgyRog (see edit history) Quote Link to comment Share on other sites More sharing options...
Mike B Posted August 7, 2008 Author Share Posted August 7, 2008 So is the disc on the wrong way:blink:( According to the outside slots it looks like jamie and I have it right as regards the outside marks, but it's the inside vanes on these big disks I think make more difference to the fade and heat dissapation.. see what chris says when he comes back... your vanes may the other way round to mine... Quote Link to comment Share on other sites More sharing options...
Jurgen-Jm-Imports Posted August 7, 2008 Share Posted August 7, 2008 my old mazda fitted as per instructions Quote Link to comment Share on other sites More sharing options...
Mike B Posted August 7, 2008 Author Share Posted August 7, 2008 these guys can't make their minds up... http://bbs.scoobynet.com/wheels-tyres-brakes-13/659259-brake-disc-grooves.html lotus say this way (page 6) http://www.bell-colvill.co.uk/admin/lotusnews/PDFS/4492.pdf Quote Link to comment Share on other sites More sharing options...
SUPRASUZUKI Posted August 7, 2008 Share Posted August 7, 2008 the wheel should have the disk vanes blow air from the centre of the disk to the outside of the disk...?... I assume... I believe you're correct. The motion of the disc ensures that the air within the vanes is 'pumped' outwards, creating air flow from the center of the disc outwards. If the vanes are the other way round, they'll be trying to draw air inwards and working aginst centrifugal force rather than with it. Quote Link to comment Share on other sites More sharing options...
Mike B Posted August 7, 2008 Author Share Posted August 7, 2008 I believe you're correct. The motion of the disc ensures that the air within the vanes is 'pumped' outwards, creating air flow from the center of the disc outwards. If the vanes are the other way round, they'll be trying to draw air inwards and working aginst centrifugal force rather than with it. exactly what the boffin part of my brain was telling me... Quote Link to comment Share on other sites More sharing options...
bignum Posted August 7, 2008 Share Posted August 7, 2008 I had an argument with a right cocky git at the ring carpark as he said henks ap`s were on the wrong way, i asked him to explain why and he couldn`t, also i noticed that stever`s are on the opposite way to henk`s so gawd knows. Quote Link to comment Share on other sites More sharing options...
Wez Posted August 7, 2008 Share Posted August 7, 2008 As already metioned by Alex, its the internal cooling fins that matter. Dont discs normally come marked up for which side they are intended? Quote Link to comment Share on other sites More sharing options...
Mike B Posted August 7, 2008 Author Share Posted August 7, 2008 As already metioned by Alex, its the internal cooling fins that matter. Dont discs normally come marked up for which side they are intended? Yes, but I have a motorsport officionardo telling me different!! I had an argument with a right cocky git at the ring carpark as he said henks ap`s were on the wrong way, i asked him to explain why and he couldn`t, also i noticed that stever`s are on the opposite way to henk`s so gawd knows. Finding excuses to start ww III in a german carpark Si? lol... watching too much top gear Quote Link to comment Share on other sites More sharing options...
Wez Posted August 7, 2008 Share Posted August 7, 2008 Yes, but I have a motorsport officionardo telling me different!! Email AP and Brembo tech support saying you have there brake setups and ask which way the disks should go Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 7, 2008 Share Posted August 7, 2008 The internal vanes are the critical bit for cooling. The pad wiper slots are subject to interpretation. Quote Link to comment Share on other sites More sharing options...
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