Guest Posted February 27, 2007 Posted February 27, 2007 lightweight pulleys and quickshift to classics, and what assistance do they give. thanks alan
wilky Posted February 27, 2007 Posted February 27, 2007 By replacing your standard pullies with light ones it means that the weight the engine has to turn is less, thus freeing up horsepower. Some people say that a reduction in weight of the pullies will unbalance the engine and that the flywheel should be lightened as well. Some people say you dont need to. Quick shift reduces the throw distance your gearstick needs to travel to get into gear so making it feel more gucci and it quicker to change gear. On an early box though some quickshifts beat the syncro of the gear making it crunch. Hope this helps. Callum W
Guest Posted February 27, 2007 Posted February 27, 2007 calum thanks for the reply, just looking at ideas to see if either will help. poss wouldnt be on the old classic but on a.n.other [] alan
johnnyr6 Posted February 27, 2007 Posted February 27, 2007 Fitting lighter pulley's won't give you anymore power but it will help the engine to spin quicker thus making it more rev happy and quicker. To get the best from them you should fit a lightened flywheel, this helps the engine spin even easier but the tradeoff is you have to rev the car more to pull away as the car will bog down and stall if not enough revs are used. I've had lightened pulleys on my car for nearly 3 years now using a standard flywheel and not had a problem with them, can't say i noticed any difference though, but if i fit the flywheel it will make a difference.
cusco kid Posted February 27, 2007 Posted February 27, 2007 hi m8 if you lighten f/wheel too much it can have an effect on tickover because of the mass being less the idle becomes lumpy, you need the flywheel to cary the engine over the non firing strokes .f1 cars dont have f/ws only a clutch pack ,thats why the idle is 5000 rpm the heavier the mass the smoother the tick over //////////////// geo
johnnyr6 Posted February 27, 2007 Posted February 27, 2007 Bikes don't use flywheels and idle fine, they also rev to buggery. My zx6r redlines at 14.5k and the cbr 250 redlines at 18k, both 4 cyl. 4 strokes. Is it not the state of tune and cams that warrant the 5k idle on F1? I'm sure the flywheel comes into it aswell though.
cusco kid Posted February 27, 2007 Posted February 27, 2007 hi m8 i have built racing engines for years the flywheel info was a generalisation i could spend hours tellying you about high performance units . rule of thumb lighter the rotating mass quicker the rev spin up- poorer the idle /// raisethe idle speed to over come lumpy tick over regards geo
fai17 Posted February 27, 2007 Posted February 27, 2007 Fitting lighter pulley's won't give you anymore power but it will help the engine to spin quicker thus making it more rev happy and quicker. To get the best from them you should fit a lightened flywheel, this helps the engine spin even easier but the tradeoff is you have to rev the car more to pull away as the car will bog down and stall if not enough revs are used. I've had lightened pulleys on my car for nearly 3 years now using a standard flywheel and not had a problem with them, can't say i noticed any difference though, but if i fit the flywheel it will make a difference. Is that why my car is bogging down alot off the line @ Crail....i've got lightened pulleys btw... Need to try it with a lightened flywheel and see if that helps it.
ally-b Posted February 27, 2007 Posted February 27, 2007 Need to try it with a lightened flywheel and see if that helps it. A lighter flywheel will make it worse due to the lack of inertia . Getting the fine balance between 'bogging-down' and wheelspin required for a good take-off is mostly down to technique and lots of practice [] Al.
johnnyr6 Posted February 27, 2007 Posted February 27, 2007 Geo, i could prob listen for hours on engine building m8. I know what you said is generally true, i was just asking how bike engines don't have the same problems as car engines. Even the hayabusa 1300cc four cyl idles fine at 800 to 1000rpm and no flywheel, weird. Maybe something to do with the bikes internals are lighter than cars, lighter crank spins easier so doesn't need a flywheel to help it round also it will be a lot more compact??? As billy says peter lightened pulleys alone won't make a difference but a lighter flywheel will. It will bog down easier. Try giving it a bit more revs off the line. What revs do you usually use for launching? i use 5 to 6k, never seems to bog down with mine.
craig mac Posted February 27, 2007 Posted February 27, 2007 Is that why my car is bogging down alot off the line @ Crail.... No, Lack of Revs and lack of speed when side stepping the cluth m8[] But watch those drive shafts!![][][]
Haribo1187 Posted February 27, 2007 Posted February 27, 2007 Hey Guys... Interesting subject.. Im just in the middle of fitting an Exedy lightened flywheel.. Could someone please point me in the right direction of the best and most reliable lightened pully kit to go for ?? Andy
Haribo1187 Posted February 27, 2007 Posted February 27, 2007 Hey Guys.. Interesting subject. Im currently in the middle of fitting a lightened Exedy flywheel to my MY99 PPP - Could someone please point me in the right direction for the best reliable lightened pully kit ?? Many thanx.. Andy
Haribo1187 Posted February 27, 2007 Posted February 27, 2007 Soz for two same comments - P.C playing up.. Lol
johnnyr6 Posted February 28, 2007 Posted February 28, 2007 I got mine from graham goode and not had a prob in 3 years. Playsatan on here has just picked up a very, very, very nice alloy crank pulley. I can't remember where he got it from but i'm sure he'll be on tonight. Pm him and he'll give you the info. It was cheaper than mine aswell.... SOD!
cullenmin Posted February 28, 2007 Posted February 28, 2007 I got mine from graham goode and not had a prob in 3 years. Playsatan on here has just picked up a very, very, very nice alloy crank pulley. I can't remember where he got it from but i'm sure he'll be on tonight. Pm him and he'll give you the info. It was cheaper than mine aswell.... SOD! It was a group buy on scoobynet, a guy called cdfracing machines them, I also got me these pulleys, very nice
Haribo1187 Posted February 28, 2007 Posted February 28, 2007 Very interested in a pully set... Hmmm does he have a contact email ?? Are there any other good places out there to buy a set ?? Many Thanks - Andy
higgy Posted February 28, 2007 Posted February 28, 2007 Andy im running a set of lightweight pullys and the advantage to the performance is verry small but whae you all the small things togerther you will know what happens[] The set i got off of ebay is great value for money and went on a treat. Higgy
cullenmin Posted February 28, 2007 Posted February 28, 2007 Very interested in a pully set... Hmmm does he have a contact email ?? Are there any other good places out there to buy a set ?? Many Thanks - Andy You could PM the guy on scoobynet, or you could browse his ebay shop as he sometimes sells them on there http://stores.ebay.co.uk/cdfracing-performance-parts http://www.cdfracing.co.uk/shop.htm The group buy prices were cheaper so you could post a comment on scoobynet to find out if the group buy is still open Rich
Haribo1187 Posted February 28, 2007 Posted February 28, 2007 Thanks Alot guys.. Whats the difference between underdrive and stock size ?? What pully you have Rich ?? Crank etc ?? Andy
cullenmin Posted February 28, 2007 Posted February 28, 2007 I've got the stock size full set (crank, power streeing & altenator). The underdrive pulleys are smaller (even lighter I think), remember a different size of belt would be needed for these. I heard that the underdrive pulleys are not so good at working the altenator, therefore short runs in the scoob would eventually leave you with a flat battery. I do not know if this is true or not (so dont quote me) but I decided to go for the stock size anyway. I never really noticed a difference after I got mine fitted but as Higgy says, all those little things add up.
Haribo1187 Posted March 1, 2007 Posted March 1, 2007 Thanks for help and efforts guys.. What sort of power you running Rich ?? I think I will just go for the stock size ones to save confusion with belts etc.. Andy
cusco kid Posted March 1, 2007 Posted March 1, 2007 hi andy i can get you prices for ausi GFB pully sets under drive with 2 new belts give me your details and i will price them with discount GFB parts are the best of aussi parts not fake types geo
cullenmin Posted March 1, 2007 Posted March 1, 2007 Thanks for help and efforts guys.. What sort of power you running Rich ?? I think I will just go for the stock size ones to save confusion with belts etc.. Andy hmm that would be telling. I need to get it rolling roaded to find out to be honest. Maybe see u on the strip at a crail day sometime[]
johnnyr6 Posted March 1, 2007 Posted March 1, 2007 I'm running the gfb underdriven pulleys and they're very good, come with the belts so it's a straightforward change. I would speak to geo, if there's a good price to be had he'll get you it. Johnny.
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