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Lightened Crankpully / Lightened crankshaft, Come and discuss
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CFS
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 Mar 13 2007, 11:23 AM
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dude crank pulley is not consider as internal rite? i think it's still external (internal usually means ur pistons, valve springs, valve, blocks & etc).....depends on wat engine is on ur ride...just imagine holding a 5 kg crankpulley & start turning (for ur 1st test)....then 2nd test u use a 1kg crankpulley & start turning...which will turn faster & more turns? if u got the budget lighten ur flywheel as well...i heard if lightening ur flywheel will kill ur top ends faster as well i wonder isit true?
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CFS
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Mar 13 2007, 03:22 PM
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QUOTE(maddriver @ Mar 13 2007, 03:09 PM) there are currently two types of lightened crank pulley in the market, one of which is undersized, and the other which comes with a damper. most of our standard pulleys comes with a rubber damper to absorb the critical vibrations comming from the crank. advantage of having an undersized pulley is that the revs climb much faster. this is what we use in our race cars. with most race cars, we rebuild out engines much after every race, so con rod bearing wear is not a problem as we change the bearings during each rebuild. so con rod bearing wear is not a factor. advantage of having a lightened and dampened pulley is that the revs will climb slightly faster, not as fast as the undersized pulleys, but with the damper in place, we will have peace of mind when it comes to the wear & tear of the con rod bearings. hope this answers your questions on the crankshaft pulley hmm true true as i know mythology lighten crank pulley came with a rubber damper which almost similar to ori pulley....hmm btw mad driver just a question...i know the revs will climb faster than usual but how about when you stuck in a traffic jam accelerate & decelerate situation when u decelerate will it have more jerk due to the innertia of the pulley have been lighten? how about hill climbing? will it hard to climb on hill compare to ori pulley due to innertia (or does this case just apply for flywheel ligthening oni)? |
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CFS
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Mar 13 2007, 04:15 PM
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QUOTE(toda6866 @ Mar 13 2007, 03:44 PM) same horses but reduced moment of inertia, which means while your rev climbs fast it drops as fast as well. general speaking u will hav an accelerated engine, but how it feels like I hav nvr experience haha if it drops as fast i guess it the car will jerk when u decelerate i guess...u will feel the engine braking much greater than b4... |
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CFS
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Mar 14 2007, 04:53 PM
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QUOTE(maddriver @ Mar 13 2007, 07:16 PM) so far, the only jerk that i encounter during a traffic jam situation is that motobike that goes in and out of traffic  haha good 1 there lolz....but i'm sure mythology 1 is one good stuff..nvm i try friend car this weekend see got any effect or not 1st..mythology is quite light but not as light as those without rubber damper1 haha  hehe |
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CFS
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Mar 16 2007, 11:08 AM
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s4ph lolz u know ler...hehe actually a couple of friend install the normal type without damper type (from thailand made forgot the brand name adi) & a couple of them install mythology which comes with damper...from what i get feedback from them is dat the mythology is not as light a the normal without damper type....i wonder is there any issue on reliability on long term hehe  This post has been edited by CFS: Mar 16 2007, 11:12 AM |
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CFS
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Mar 16 2007, 11:31 AM
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QUOTE(pacer @ Mar 16 2007, 11:22 AM) CFS, i guess if u had the $$ u would go to the one with damper... firstly u will save ur engine a bit becoz it has a damper, secondly, if its too light then u will lose a bit of low end torque, by looking at the methology pulleys i guess that the torque loss is neglectable in the lower range. try to see the dyno chart for the one without the damper and compare. cheers haha i guess u know me well....i will get the mythology1 rather than the other1 due to it's rubber damper haha....the dyno chart i saw long ago adi hehe... cheers  |
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CFS
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Mar 16 2007, 02:33 PM
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QUOTE(pacer @ Mar 16 2007, 01:45 PM) thanks, i also have seen this b4, what i was referring to was if there was one to compare with the cranks pulley without the damper. and also for a long time i have wondered, stock neo 0-100km/h is 8.4 sec??? stock gen2 manual is about 10sec so a car about 50kg lighter can do so much better? lol brother 50kg is quite alot adi ler...hehe almost 70-80% of a human guy weight jor...lolz & not to mention like my car which have abs adding an additional 50kg weight to it, even my stock seat is dem heavy...lolz but 8.4 sec...errr i not sure possible or not...how heavy is the neo adi ar? 1150? |
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CFS
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Mar 16 2007, 04:16 PM
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QUOTE(maddriver @ Mar 16 2007, 03:28 PM) the ones without the damper is probabily undersized. that's why u find the performance slightly better.............but the trade off is that becos the pulley is smaller, the air con won't be as cold and the alternator and power steering pump will not be working at optimum during idling. hmm true true....wonder isit true i never really try b4...have to sit on others plp car & try then oni know lolz..hehe |
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