Hydro101 Neutral Newbie August 22, 2006 Share August 22, 2006 they are both useless ↡ Advertisement Link to post Share on other sites More sharing options...
Ceratoisthebest Neutral Newbie August 23, 2006 Share August 23, 2006 (edited) Really meh?????? I got fren put crank pulley got a lot of use lei. Pickup faster lei. He say immediate response. Then open pod to me i install. Personally i feel not much difference unless u modify yr exhaust also. Because High input must come with high output also ma. Tat is wat i persoannly feel. And also open pod must come with CAI if not useless also. Cold air is better for engine. Edited August 23, 2006 by Ceratoisthebest Link to post Share on other sites More sharing options...
Turbonetics 2nd Gear August 23, 2006 Share August 23, 2006 light weight pulley does not give any gains to ur car...it only makes ur car more revvy...but some light weight pulley will damage ur engine in long run,unless u can get those recognised brand... open-pod have got SRI and CAI set up....SRI is good for high rpm performance and CAI gives gain almost thru out the rpm...but the set-up of CAi is also impt depending on individual ride.... Link to post Share on other sites More sharing options...
Ceratoisthebest Neutral Newbie August 23, 2006 Share August 23, 2006 OIC. For mine i do feel my car more willing to go after open pod and CAI. Haha. Link to post Share on other sites More sharing options...
Hattee Neutral Newbie August 23, 2006 Share August 23, 2006 (edited) Perhaps, any unbalanced lightweight pulley is out of our consideratoin here. Assuming it's balanced, what could be interesting is to reconcile the claim of having harmonic dampening other pulley does not have and yet having reduced weight? Looking at the pulley contruction (precision balanced), its harmonics is certainly insignificant as compared to those potentially damaging harmonics from the engines, drive-train and anciliaries connected to the belt. I would think no pulley producers will claim capable of dampening those high magnitude and broad spectrum harmonics. At best, the inertia of a well-designed lightweight pulley can only protect itself against its own harmonics at engine extreme rpm. The drive-train and anciliaries crank loads are what's left to safe it when its harmonics magnitude overwhelms its own inertia. [Mazel_tov]------ As far as i know, any rotating mass needs to be balanced. This can be achieved by either shaving off matl, adding weights and the likes. Wat i gathered fm the net is that a aftermarket pulley w/o a harmonic damper wil result in vibration that may b detrimental to the engine in the long run. Tat was the reason y i held back till RPM came out w a pulley w damper tt resembles the stock pulley's construction. As far as i'm concerned, a similar sized pulley w similar harmonic damper layout n yet being lighter in weight definately merits some form of consideration. Appreciate your pointers on the pulley though. Perhaps other gurus/lao jiaos can proive a better insight? Edited August 23, 2006 by Hattee Link to post Share on other sites More sharing options...
Mzrmazda3 6th Gear August 23, 2006 Share August 23, 2006 Bro, thanks for your post man At least, this will deter me from toying the idea of changing to a lighten pulley Link to post Share on other sites More sharing options...
Hattee Neutral Newbie August 23, 2006 Share August 23, 2006 If dampening from pulley is primarily for its own harmmonics, isn't it safe to use lighter crank pulley so long its precision balanced? Link to post Share on other sites More sharing options...
Mzrmazda3 6th Gear August 23, 2006 Share August 23, 2006 Bro, paiseh Me not that technically trained hence can't answer your question Link to post Share on other sites More sharing options...
Hattee Neutral Newbie August 23, 2006 Share August 23, 2006 People switched to lighter weight pulley says their pickup from standstill improves. I suspect is correct for most cases. Our bet is OEM has overkilled in the inertia of its pulley design. Seems many lightened pulleys use stronger tensile but lighter material. Assuming they are adequately balanced, unlikely they can fail any earlier than OEM pulley under severe harmonics conditions exterted at the crank shaft. Even though neither one are effective dampeners of harmonics from engine, drive-train and anciliaries loads, perhaps. Only potential downside might be the severity of the harmonics exerted on the crankshaft with lighter pulley at extreme rpm when off-loaded from the drive-train. Can the higher tensile material better withstand such exceptional conditions than the OEM pulley (a question of design strength than inertia)? Link to post Share on other sites More sharing options...
Root Neutral Newbie August 23, 2006 Share August 23, 2006 fyi, the later batch of rpm pulleys DOES come w hamonic damper...i guess that shd debunk any discussions abt aftermarket pulleys not having it...i hv one installed in my ride, so far so gd... hi was wondering how you know there is hamonic damper in the RPM pulley you had purchased? You heard the mech tell you so or you have actually proven it does really have the damper? Link to post Share on other sites More sharing options...
Ceratoisthebest Neutral Newbie August 23, 2006 Share August 23, 2006 Written in hot stuff. Can't be wrong bah. Haha and also see wat brand u buy la. Mine is RPM quite reputable for this so can't bluff ppl de la. Link to post Share on other sites More sharing options...
Root Neutral Newbie August 23, 2006 Share August 23, 2006 if that is what is enough to convince. you may think otherwise, but i don't believe in what advertisement claim. I'm sure you have heard that certain product after install will improve certain improvement, but most of the time it didn't make that claim. However, consumers are unaware or they are just happy with the "improvement" their butt felt. No offence on bros who had installed the rpm, perhaps more info or test should be provided to sustain the claim that RPM Light-weight Crank pulley has the damper it them. Link to post Share on other sites More sharing options...
Ceratoisthebest Neutral Newbie August 23, 2006 Share August 23, 2006 Of course b4 u install u must check la. Haha..... Link to post Share on other sites More sharing options...
Mazel_tov Neutral Newbie August 23, 2006 Share August 23, 2006 (edited) hmmm...u sounded very skeptical...a bad experience b4 perhaps? anyways, as i was organising a GB for ES, i was given a RPM pulley w a quarter section cut off as prove to show tt it does hv the damper inside. n tis was b4 Avant Garde placed an ad in hotstuff. the damper is slotted inside the inner circumference of the pulley itself, n its very visible. mabbe u might wanna pop by place like RV, chip soon to hv a look @ the item. goodness...y am i sounding like a salesman? Edited August 23, 2006 by Mazel_tov Link to post Share on other sites More sharing options...
Mazel_tov Neutral Newbie August 23, 2006 Share August 23, 2006 People switched to lighter weight pulley says their pickup from standstill improves. I suspect is correct for most cases. Our bet is OEM has overkilled in the inertia of its pulley design. Seems many lightened pulleys use stronger tensile but lighter material. Assuming they are adequately balanced, unlikely they can fail any earlier than OEM pulley under severe harmonics conditions exterted at the crank shaft. Even though neither one are effective dampeners of harmonics from engine, drive-train and anciliaries loads, perhaps. Only potential downside might be the severity of the harmonics exerted on the crankshaft with lighter pulley at extreme rpm when off-loaded from the drive-train. Can the higher tensile material better withstand such exceptional conditions than the OEM pulley (a question of design strength than inertia)? as always, there will always be diff school of thoughts where aftermarket parts are concerned. the most popular way to play down a aftermarket product will sound like: "if its so gd then y didnt the oem use it?" sound too familiar? u sound like u r technically inclined bro but as far as i'm concerned, the pulley's working fine n dandy, n i most certainly hope tt ur assumption on harmonics exerted on the crankshaft will not come true...@ least till 3 yrs later when i decide to change my ride! kudos to u for ur knowledge sharing! Link to post Share on other sites More sharing options...
Benester Neutral Newbie September 3, 2006 Share September 3, 2006 Hi, where you bought your RPM Light-weight Crank pulley? And how much? thks. ↡ Advertisement Link to post Share on other sites More sharing options...
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