Arran Posted October 22, 2013 Share Posted October 22, 2013 (edited) Was researching their pulley kits as i keep being tempted by these especially when my lightweight flywhell goes in and ive stumbled across these articles and ive read alot into them, I know you only hear bad stuff on the net but surely theres a small cause for concern there, especially with the pulleys being a vital part of the engine. http://hooniverse.co...iness-as-usual/ http://ams-pirates.com/ http://www.motoiq.com/MagazineArticles/articletype/articleview/articleid/1094/article.aspx There are many more topics on the web aswell What do you guys think? I know some are running the pulleys with no problems and a few traders have dealt with them. Could be what people are saying that some companies/people are trying to ruin their reputation but you can never be sure Its thrown a spanner in the works for me thats for sure Edited October 22, 2013 by Arran Quote Link to comment Share on other sites More sharing options...
Dblock Posted October 22, 2013 Share Posted October 22, 2013 I have researched the pulleys before fitting them. People will tell you that the pulley is a harmonic damper but that's false. I fitted thr pulley and the old pulley is solid cast metal no runner or damping. V6's have stout and short cranks which are internally balanced. A fluid dampr is a harmonic damper. The oem isn't. I have fitted it to my own car and I wouldn't if it would cause harm. Quote Link to comment Share on other sites More sharing options...
Daryl Posted October 22, 2013 Share Posted October 22, 2013 Iv had the AMS puley's fitted for a couple of years now, and had no problems with them at all. The only slight thing with them, is that being ally, on a cold day, your belts squeak abit for a few minutes while the engine gets some heat. As soon as the car is up to temp, the noise stops. you can keep adjusting the belt, but thats abit of a pain, and if you keep putting tension on the belt, they will just stretch and possibly break. Worth fitting by the way, I have a LW flywheel and the pulley's and together they really help the engine rev. Quote Link to comment Share on other sites More sharing options...
Arran Posted October 22, 2013 Author Share Posted October 22, 2013 Yeah ive read alot into the harmonic damper business and now this with ams, I still want to fit a set just wary now as it would just be my luck that id have problems How much difference would you say its made daryl? Did you fit them together or separately so you could feel the difference each made Quote Link to comment Share on other sites More sharing options...
Tarmac@TarmacSportz Posted October 22, 2013 Share Posted October 22, 2013 It is interesting reading, we had an issue with some coilovers a few years ago, to be fair they said they would take them back but I never got them back from the customer to return so we worked something out between us to compensate. The pulleys are decent but there wasn't many more parts to choose from, plus they messed me about on the last order so that will be the last order. Quote Link to comment Share on other sites More sharing options...
Arran Posted October 22, 2013 Author Share Posted October 22, 2013 So if the rumours are correct who's pullies would they be copying? assuming they haven't designed their own even though they look great in photos shame its come but I do do alot of research before I buy anything sometimes it pays Quote Link to comment Share on other sites More sharing options...
Dblock Posted October 22, 2013 Share Posted October 22, 2013 Iv had the AMS puley's fitted for a couple of years now, and had no problems with them at all. The only slight thing with them, is that being ally, on a cold day, your belts squeak abit for a few minutes while the engine gets some heat. As soon as the car is up to temp, the noise stops. you can keep adjusting the belt, but thats abit of a pain, and if you keep putting tension on the belt, they will just stretch and possibly break. Worth fitting by the way, I have a LW flywheel and the pulley's and together they really help the engine rev. Never had that problem tbh. Did you replace the nut on tensioner? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 22, 2013 Share Posted October 22, 2013 A lot of engines are designed to have external vibration damping, the reason for this is because during the firing of each individual cylinder torque stress is imparted into the crankshaft which makes it deflect setting up vibrations, At certain RPM this vibration can set up a resonance which amplifies the stress to a point beyond what the crankshaft can stand, which in extreme cases can cause crankshaft failure. If it has a harmonic crank pulley as std then if you fit a solid undamped item you run the risk of this happening, maybe not in a few thousand miles but its eventually likely to fail, especially if the engine is tuned or used hard, you pay your money you take your chance. Quote Link to comment Share on other sites More sharing options...
Arran Posted October 22, 2013 Author Share Posted October 22, 2013 Maybe one of the traders could clarify once and for all if our engines are externally balanced as well Quote Link to comment Share on other sites More sharing options...
Dblock Posted October 22, 2013 Share Posted October 22, 2013 A lot of engines are designed to have external vibration damping, the reason for this is because during the firing of each individual cylinder torque stress is imparted into the crankshaft which makes it deflect setting up vibrations, At certain RPM this vibration can set up a resonance which amplifies the stress to a point beyond what the crankshaft can stand, which in extreme cases can cause crankshaft failure. If it has a harmonic crank pulley as std then if you fit a solid undamped item you run the risk of this happening, maybe not in a few thousand miles but its eventually likely to fail, especially if the engine is tuned or used hard, you pay your money you take your chance. True but have you seem the oem pulley. It's 100% not damped. If it was if agree to replace it with a damped one. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 22, 2013 Share Posted October 22, 2013 It may not look like it at first glance, but I think it will be, I really cant think of any modern engines (1990 on) that dont have a harmonic balancer. Quote Link to comment Share on other sites More sharing options...
Tarmac@TarmacSportz Posted October 22, 2013 Share Posted October 22, 2013 I don't know on whether this item is a copy of another design or not tbh. There are not that many standard pulleys out there, Stillen do one. If you look at undersized pulleys then there are shed loads of the same design but a lot of different brands. Re-branding and copying designs is common practise and by no means are AMS the only ones that do it. Quote Link to comment Share on other sites More sharing options...
KyleR Posted October 22, 2013 Share Posted October 22, 2013 Are the AMS ones undersized or OEM? Maybe they do both? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 22, 2013 Share Posted October 22, 2013 ATI do an expensive harmonic damped aftermarket crank pulley, so do Boost logic, all the pattern part pulleys are harmonic damped based on the std part, don't quite see the point of running an undersized pulley, why over speed the alternator, power steering pump and air con pump. Quote Link to comment Share on other sites More sharing options...
Arran Posted October 22, 2013 Author Share Posted October 22, 2013 The ams are oem size but lightweight I believe stillen are under driven Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted October 22, 2013 Share Posted October 22, 2013 I have a larger supercharger pulley fitted, there were too available I went with the one that was the same as the oem, and not the one that was welded. Both work, but the talk was that the welded one would shorten the engine life span. Quote Link to comment Share on other sites More sharing options...
Dblock Posted October 22, 2013 Share Posted October 22, 2013 ATI do an expensive harmonic damped aftermarket crank pulley, so do Boost logic, all the pattern part pulleys are harmonic damped based on the std part, don't quite see the point of running an undersized pulley, why over speed the alternator, power steering pump and air con pump. I'm not questioning your wrong but do you have any proof that is is harmonic damped? Quote Link to comment Share on other sites More sharing options...
Dblock Posted October 22, 2013 Share Posted October 22, 2013 It may not look like it at first glance, but I think it will be, I really cant think of any modern engines (1990 on) that dont have a harmonic balancer. Also don't v6's have balance shafts too? I will try to find that post that made alot of sence to me when choosing to fit the AMS pulley. Quote Link to comment Share on other sites More sharing options...
evilscorp Posted October 22, 2013 Share Posted October 22, 2013 If I can be ass'd I will look out my old oem one which is in the garage. I believe it has a rubber ring somewhere on it. I have the AMS lightweight ones, no problems so far (16000+miles) but will be buying the Fluidampr pulley because it is slightly larger and will spin my supercharger faster and is dampened, ....... just in case, when the power becomes a bit too much Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 22, 2013 Share Posted October 22, 2013 Here is a pattern VQ35DE crankshaft pulley, if you look you can see where its decoupled/damped, http://reindeerparts.de/en/autoteile/NDS-VQ23-CRANKSHAFT-PULLEY-ENGINE-VQ23DE-VQ35DE-OEM-to-compare-12303-8J101Model-NISSAN-MURANO-Z50-2002-2007.html The DE engine dose not use any balancer shafts, the later VHR may but I don't think so. 1 Quote Link to comment Share on other sites More sharing options...
Dblock Posted October 22, 2013 Share Posted October 22, 2013 Here is a pattern VQ35DE crankshaft pulley, if you look you can see where its decoupled/damped, http://reindeerparts...-2002-2007.html The DE engine dose not use any balancer shafts, the later VHR may but I don't think so. I'm sorry what am I looking for? where is it damped? Quote Link to comment Share on other sites More sharing options...
Mark@Abbey m/s Posted October 23, 2013 Share Posted October 23, 2013 Let me look into the discussion and come back with some information. Mark Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 23, 2013 Share Posted October 23, 2013 Here is a pattern VQ35DE crankshaft pulley, if you look you can see where its decoupled/damped, http://reindeerparts...-2002-2007.html The DE engine dose not use any balancer shafts, the later VHR may but I don't think so. I'm sorry what am I looking for? where is it damped? If you look carefully at the junction of the two diameter pulleys its decoupled by a thin rubber insert. Quote Link to comment Share on other sites More sharing options...
Daryl Posted October 23, 2013 Share Posted October 23, 2013 Iv had the AMS puley's fitted for a couple of years now, and had no problems with them at all. The only slight thing with them, is that being ally, on a cold day, your belts squeak abit for a few minutes while the engine gets some heat. As soon as the car is up to temp, the noise stops. you can keep adjusting the belt, but thats abit of a pain, and if you keep putting tension on the belt, they will just stretch and possibly break. Worth fitting by the way, I have a LW flywheel and the pulley's and together they really help the engine rev. Never had that problem tbh. Did you replace the nut on tensioner? No idea,i think the guy who fitted them just swapped the pulley's over and reused the same nuts. I did the pulley's a few years back, and notice a small difference, mainly when going from 30mph in 6th. The LW flywheel was done this year. If you feel the weight of the standard pulley's compared to the LW ones,then you will see where the gain is. Quote Link to comment Share on other sites More sharing options...
Dblock Posted October 23, 2013 Share Posted October 23, 2013 Here is a pattern VQ35DE crankshaft pulley, if you look you can see where its decoupled/damped, http://reindeerparts...-2002-2007.html The DE engine dose not use any balancer shafts, the later VHR may but I don't think so. I'm sorry what am I looking for? where is it damped? If you look carefully at the junction of the two diameter pulleys its decoupled by a thin rubber insert. I'm 95% sure my oem one didn't have that and it was solid. Quote Link to comment Share on other sites More sharing options...
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