Prices Can do same group buy IF get 10 or more otherwise can do 10% off. Some more info. Measurements and wieghts below for the three types. Stock Weight my digital scales only tgo up to 6kg and was over this and human scales showed around 6.2kg. Basic timing marks. Sizes are OD of pulley where outer belt runs for power steering being the outer one 100mm Middle AC 150mm Inner Alternator and fan 150mm UAS Weight 4.57 kg Two piece with vulcanised rubber to absorb resonance from crank and 360 degree marks and timing marks. Slightly under driven. Outer 90mm Middle 140mm Inner 140mm GFB and Unorthodox Racing. Weigth 870 grams basic timing marks, under driven, one piece Non harmonic balancer one piece alloy pulley. Outer 75mm Middle 120mm Inner 120mm Again re weight we could have made them lighter but at the sacrifice of resonance absorption and balance, and with most wanting this item having big hp motors it is not a good idea. Looks alone do not make power and again vibration robs power also. These if anything look better anyway, although low in engine bay and hard to see on most cars especially fith stock radiator fan shroud. The UAS Ross balancer one we sell absorbs resonance better than factory harmonic balancer. They can only be all blue or all red or bare silver but in silver I don't think can get the cam timing marks.
Sounds good I will likely pick one up anyway over the comming months (getting other parts first) but is anyone else up for a group buy on these? I know getting 10 is a big ask but if people are interested i'd be happy to try and organise this.
100,000 + miles on cars with UDP with no issues. Plenty of evidence to show that UDP doesn't cause significant damage, with almost none to show it does. Plenty of "oh increased vibrations.. bad... could notice vibrations.. bad ... blah blah blah" opinions though.
I had a UR udp on my car for over a year, when it was going! I swore if anything changed at all, with regard to engine noise-vibration, the stock pulley was to be reinstated immediately, nothing changed: zlove:
SO what would be the full price all up if we were to get 10 people? After reading different posts by people I am confused some say yes other say no so hope fully il get thid UDP that i bought get it ballenced and try it if it has vibrations or any other noticble negative affects Il scrap it and go for a propper one. If so well have three down and seven other people needed to join for the GB. At the moment I think i will get the udp ballenced and fitted then i will go from there. Also how much HP do these propper udp,s promise? Also Im not really fussed if the udp looks all shiny or all rusty aslong as it works and dosent have any negative affects on the engine
Hmmmm Last time we did not get 10 so I sucked up about 4 in the end. I was a bit amzed me not a lot of interest. So many buying the bling alloy pulley ones that are no good and the extra bling one that works not many wanted, but understand it is a price thing.
So many conflicting answers I read lots of forum posts saying one thing and people saying no problems and it seems hard to find examples of failure except hearsay (not to say there isnt problems with them just hard to get concrete proof) On the other hand you look at the FAQ for unorthodox and they claim that the whole problem stems from the terms being used but then they are trying to sell it to you so its in their interest to say theres no problems. So they do go into the hearsay and then they followup with this about bearing damage. So again it makes it even more confusing. Personally im still on the fence with it. That said after spending a fair bit of money on my engine and car as a whole I'd hate for it to have problems down the track. But still trying to find decent evidence of it being a problem in the first place. I beleive the last group buy ran at $450/pulley plus postage.
I remember And I also remember the shit storm over a few specifics. Kicking myself I didnt get in on it at the time but that said at the time wasnt building my engine like I am now.
"extra bling one that works not many wanted" Yes it looks good, but what dose it do, that the stock pulley doesn?t. It weights a little less and looks much better than stock, but is there a measurable difference over stock? Is there a real benifit in fitting this pulley?
There would be a difference Just there wouldnt be as much of a difference compared to other super light weight ones. It under drives as well but again not by as much which is probably a good thing as most people tend to bring their pumps back to normal speed with a $150~ overdrive pulley. So that said your $300ish for a super light weight plus the $150 to bring the pump back to spec and your already at the price of the UAS one in the group buy.
Not much Unless you are building a big motor, you are better off leaving the stock harmonic balancer and spending money on something that will make power. The UAS ones look better than stock black big thing. It has 360 degree wheel markings for dialling in cams, which is handy for big motors being built with aftermarket cams, otherwise useless. Absorbs resonance slightly better than stock harmonic balancer, and if old stock one then potentially a lot better. It is much better balanced as the three we have had balanced were .5 , .5 and .6 of a gram which is equivalent to one small posted note, and basically stuff all and consistent. Check the balance of the alloy ones and stock ones. They are vulcanised and bolted together, so stronger and cannot came apart, so safer, and ANDRA approved, unlike the alloy or factory one.
But whats your take on wear? In terms of bearings? Asuming what unorthodox is correct they claim there isnt any difference. Actually do you have links to people who have had real problems with a UDP?
Good points for sure, but its usual to have a built motor balanced as a rotating assembly, no matter what hp a person was after. Not knocking the pulley, I like it! and if it came in black I'd possibly buy one on looks alone, and have it balanced with my engine, when the time came.
Balance If you had it balanced with the engine, wouldnt it then have no problems? As then in theory it would all be balanced correctly. The engine I have was balanced with the stock pulley so i'll be using that for the time being, that said if it would produce no ill effects i'd go with my spare GFB and balance again. But i've got no idea who in Perth would do it.
Plenty I know of plenty who notice vibration but few want to say so on forum I guess. Kind of same syndrome as the movie Midnight Express I guess. Everyone walking the same way, and so I will. Grant at Performance Turbo's in Perth had bearing issues years ago on two big motors he built, which were attributed to the alloy pulley's. I has Ross Balancers custom mod an alloy under driven one using vulcanised rubber. Later we had them design the proper ones we have now. Pic of early versions. Then prior to that stock crank pulley (harmonic balancer) as per below pics. Even if I wanted a alloy pulley my experienced mechanics would not do it as they know better. Supplies will either not tell the whole story or not know. Plenty of companies and products make certain claims that few ever test or can test. Things like Splitfire coils making 10% more power I think I have seen. We found ZERO gain on a Skyline that had good stock coils. We did not expect it to make more power either. Re these balancers some things can be improved or replaced with aftermarket but within reason. Such as this Nissan know that you need a harmonic balancer and know better than a relatively small after market supplier or manufacturer. Depends what you want to believe or what you look for as always to find it especially on forums as mentioned. Beware!!!
Cheers for the reply Always good information and IMO its good to have both sides of the debate! I'd like to get one of the Ross ones but cant see us getting 10 people, and the cost is what prevents me at the moment when there are other items to be had first. That said, if people are interested it'd be good to get.
Less of a problem If you get it balanced which you should then it simply does not add to the problem as it does nothing to absorb resonance or vibration.
Fair enough So in summary. Light weight pulley would not make it worse if balanced but would not prevent the problem which is what the stock pulley does. Actually when your talking about balancing it are you talking about balancing just the pulley or the entire rotating assembely. For example if I put mine together all balanced with the OEM pulley would I need to do more work to replace it with the Ross one in terms of balance?
If you were building an engine, and had the roses pulley to put on, you would balance the whole assembly clutch, fly, everything that rotates, what ever need to be balanced would be done then. He is saying the Ross pulley is balanced to within 005 of a gram, and can be installed on a running motor, and also works a little better at damping harmonics, than the stock number.
I think I understand so if you got it ballenced while it was on the crank it would be floorless? So if i get the udp ballenced alone and then get it fitted later it will be ok? sorry if I am sounding like I couldent be botherd reading the above which I have but I just wanted a clear answer. many thanks guys before you guys replyed to my post I didnt think that there was somuch to consider when purchasing a UDP. much appreciated guys
