Dim Sum Posted October 25, 2011 Share Posted October 25, 2011 http://www.ebay.co.uk/itm/370500983702?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 Just wondering if these are any good, anyone brought something similar on ebay? Quote Link to comment Share on other sites More sharing options...
Al Massey Posted October 25, 2011 Share Posted October 25, 2011 I wouldnt bother and i dont think many people would from ebay Our very own Paul whiffin (whiffbits) do these http://www.mkivsupra.net/vbb/showthread.php?255993-Whifbitz-billet-engine-pulley-special-offer Quote Link to comment Share on other sites More sharing options...
FOSTA Posted October 25, 2011 Share Posted October 25, 2011 there are the japspeed ones also knight racer sell the same kit for £79.00 i think im not 100% sure of there quality but i think both japspeeed and knight racer have good names ;-) Quote Link to comment Share on other sites More sharing options...
Scott Posted October 25, 2011 Share Posted October 25, 2011 You'll have no issues with those pulleys. They are made the same way from the same materials as all lightweight pulley sets. They don't need to be particularly accurate (Although the fact they are CNC made will take care of the accuracy). The only lightweight one not to touch would be the crank pulley. The ones that Paul sells will be lighter, well the PS one certainly will be, as it has a few holes in it to help lower the weight Quote Link to comment Share on other sites More sharing options...
hodge Posted October 25, 2011 Share Posted October 25, 2011 I've fitted a couple of those eBay kits and every set I've fitted the PAS pulley wasn't square and wobbled all over the shop. Quote Link to comment Share on other sites More sharing options...
Scott Posted October 25, 2011 Share Posted October 25, 2011 I've fitted a couple of those eBay kits and every set I've fitted the PAS pulley wasn't square and wobbled all over the shop. Really? A blind chimp could manufacture that on a CNC machine lol. Quote Link to comment Share on other sites More sharing options...
hodge Posted October 25, 2011 Share Posted October 25, 2011 Really? A blind chimp could manufacture that on a CNC machine lol. Seriously mate. They must have ran out by atleast a millimeter or more. The last 1 I put on Bosscos car was so bad I thought the belt was going to come off. Quote Link to comment Share on other sites More sharing options...
TubbyTwo Posted October 26, 2011 Share Posted October 26, 2011 Save yourself the hassle, get the pulley kit from Whifbitz, the products are top notch and so is the service. Quote Link to comment Share on other sites More sharing options...
marbleapple Posted October 26, 2011 Share Posted October 26, 2011 Really? A blind chimp could manufacture that on a CNC machine lol. I don't even know what a CNC machine is. I must be worse then a blind chimp Quote Link to comment Share on other sites More sharing options...
Bossco Posted October 26, 2011 Share Posted October 26, 2011 Yeah these are just trash and made very cheaply. I'm sure most sets come out without any problems....just not the ones I've seen. Quote Link to comment Share on other sites More sharing options...
Dnk Posted October 26, 2011 Share Posted October 26, 2011 I don't even know what a CNC machine is. I must be worse then a blind chimp Really dont see how you could mess up making these as it doesn't get much easier Here you go, the first pic is a lathe and the second is a 5 axis machining center CNC = computer numerical control Quote Link to comment Share on other sites More sharing options...
Terminator Posted October 26, 2011 Share Posted October 26, 2011 I would not touch these with a bargepole. I had a good look a set and the quality of the metal used is poor, grain structures consistent with very cheap alloy, some micro cracking evident when subjected to dye testing. OK as over priced paperweights but not fit for use on a car. Quote Link to comment Share on other sites More sharing options...
little num Posted October 26, 2011 Share Posted October 26, 2011 Well i have a set fitted to my car and they are brill, i paid £45 for the full set off ebay about 6 months ago, but the pas pully does wobble very slightly but hasent caused a problem. They are alot lighter then stock pullys so worth a shot. Quote Link to comment Share on other sites More sharing options...
Dnk Posted October 26, 2011 Share Posted October 26, 2011 I wouldnt want wobbly pulleys on my car as over time its going to vibrate and cause a premature failure, more than likely the bearing. Just buy a well made set, cheaply made out of poor quality material just isn't worth doing in my opinion Quote Link to comment Share on other sites More sharing options...
Scott Posted October 26, 2011 Share Posted October 26, 2011 If the alloy isn't good quality then they must be lying about what they are using in the Ad. From what I remember t6 6061 is pretty good stuff. I'm sure that's what we used in the work and it came up lovely. Quote Link to comment Share on other sites More sharing options...
Dim Sum Posted October 26, 2011 Author Share Posted October 26, 2011 If the alloy isn't good quality then they must be lying about what they are using in the Ad. From what I remember t6 6061 is pretty good stuff. I'm sure that's what we used in the work and it came up lovely. So theres for and against for the items, i guess buy at own risk.......... i'm going to give them a ring to make sure if it is t6 6061. Quote Link to comment Share on other sites More sharing options...
Scott Posted October 26, 2011 Share Posted October 26, 2011 So theres for and against for the items, i guess buy at own risk.......... i'm going to give them a ring to make sure if it is t6 6061. If they are off true I wouldn't touch them to be honest. Quote Link to comment Share on other sites More sharing options...
hodge Posted October 26, 2011 Share Posted October 26, 2011 Really dont see how you could mess up making these as it doesn't get much easier Here you go, the first pic is a lathe and the second is a 5 axis machining center CNC = computer numerical control It's very easy to get these wrong to be honest. By the looks of them they will be done in 2 operations. After they have been turned there will go onto a machining centre to be finished. If there not clamped square then everything done in the 2nd op is going to be out of position which will make it wobble when it's fitted. A small discrepancy will be magnified when it's rotating. Quote Link to comment Share on other sites More sharing options...
Dim Sum Posted October 26, 2011 Author Share Posted October 26, 2011 Okay I stay away from these and save a bit more for the better ones. I glad I asked before buying. Quote Link to comment Share on other sites More sharing options...
hodge Posted October 26, 2011 Share Posted October 26, 2011 I've fitted Greddy pulleys to mine there expensive but the quality is 1st class. Quote Link to comment Share on other sites More sharing options...
Dnk Posted October 26, 2011 Share Posted October 26, 2011 It's very easy to get these wrong to be honest. By the looks of them they will be done in 2 operations. After they have been turned there will go onto a machining centre to be finished. If there not clamped square then everything done in the 2nd op is going to be out of position which will make it wobble when it's fitted. A small discrepancy will be magnified when it's rotating. Sorry Hodge but i disagree, this is basic engineering and most skilled engineers could do these with one arm tied behind their back. If its not clamped square for the second op then they their not very good and wouldn't get a job sweeping the floor in places i've worked. Quote Link to comment Share on other sites More sharing options...
hodge Posted October 26, 2011 Share Posted October 26, 2011 Sorry Hodge but i disagree, this is basic engineering and most skilled engineers could do these with one arm tied behind their back. If its not clamped square for the second op then they their not very good and wouldn't get a job sweeping the floor in places i've worked. Well then were down to quality of workmanship then arnt we. We've sent parts out place to be machined in India and they couldn't hit tolerances we can easily hit. Who's to say that the guys doing these are skilled engineers like ourselves. Quote Link to comment Share on other sites More sharing options...
Scott Posted October 26, 2011 Share Posted October 26, 2011 Well then were down to quality of workmanship then arnt we. We've sent parts out place to be machined in India and they couldn't hit tolerances we can easily hit. Who's to say that the guys doing these are skilled engineers like ourselves. I think Dunk was referring to the "easy to get these wrong" part. IMO it's not at all easy to get these wrong if you have even the slightest idea of what you are doing. It's not as if the tolerances are going to be tight on this sort of work. Quote Link to comment Share on other sites More sharing options...
Terminator Posted October 26, 2011 Share Posted October 26, 2011 If the alloy isn't good quality then they must be lying about what they are using in the Ad. From what I remember t6 6061 is pretty good stuff. I'm sure that's what we used in the work and it came up lovely. I don't know what the ones I tested were machine from, I never tested them for alloy content. I still have one as a overweight, so I'll run a PMI, test on it the next time I am home. I wanted to be sure they were strong enough to survive in a car for track use. The dye test results were poor enough to make me concerned about their strength. If you combine this weakness with a slightly off centre out of balance machining, then in my opinion it was a recipe for accelerated failure. For the few grams of difference in rotating mass theses thing make they are not worth the risk. They are just poor quality unnecessary engine bay bling, not suited to a high performance engine bay. Quote Link to comment Share on other sites More sharing options...
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