Zman Posted August 27, 2003 Share Posted August 27, 2003 how much can you get sr20 (s14a) pulleys for? Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-504584 Share on other sites More sharing options...
T0nyGTSt Posted August 27, 2003 Share Posted August 27, 2003 Hey, my pulleys are out of the engine as it is. Anyone got a contact in Sydney??? T. Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-504611 Share on other sites More sharing options...
R31Nismoid Posted August 27, 2003 Share Posted August 27, 2003 Sweet as... GTS-t VSPEC... dont forget!!!! lol! also, if you can see just how much weight they can save it would be super! Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-504845 Share on other sites More sharing options...
rev210 Posted August 28, 2003 Share Posted August 28, 2003 The goal is to get 4 kilo's off the whole pulley setup I reckon. T0nyGTSt, can you weigh the front pulley mate? Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-505385 Share on other sites More sharing options...
T0nyGTSt Posted August 28, 2003 Share Posted August 28, 2003 Originally posted by rev210 The goal is to get 4 kilo's off the whole pulley setup I reckon. T0nyGTSt, can you weigh the front pulley mate? Ok I'll see what I can do tonite. T. Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-505421 Share on other sites More sharing options...
GTS-t VSPEC Posted August 28, 2003 Share Posted August 28, 2003 I was speaking to Steve at SST, he said that the main pully might be hard to change as it will affect the hramonics of the crank. Any ideas? Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-505422 Share on other sites More sharing options...
rev210 Posted August 28, 2003 Share Posted August 28, 2003 yes it will effect the harmonics of the crank, in much the same way as the flywheel does.It will be greatly offset in magnitude due to the great reduction in inertia hence the vibrational force is far less significant. There seems to be two schools of thought on the harmonic balancer issure, one is to increase the dampening through the front pulley and thus increase the weight of the pulley. And the other is to lighten it dramatically to reduce the magnitude of force any vibration may have, both systems also rely on reducing the diameter of the front pulley in both cases reducing the 'outer' rotational mass and hence reducing the inertia. The factory harmonic balancer on the RB26dett was found to produce a harmonic imbalance under extreeme racing conditions when it was in group A racing. They had to change the balancer for a custom made unit to fix engine failure problems. Having said that, there are many present day R32's in circuit racing who have not changed those same factory balancers resposible for the group A dramas. The V configuration engines suffer from harmonic issues to a greater extent and even the VG30's can be run safely with light weight front pulleys from what I have heard. I'd put a light weight front pulley on without batting an eyelid. Having done so to quite a few engines thus far without issue. Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-505531 Share on other sites More sharing options...
GTS-t VSPEC Posted August 28, 2003 Share Posted August 28, 2003 Dave, Seems reasonable to me. I'll ask the guys at Rotomotion as they do pulleys for the race cars, see what they think. Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-505539 Share on other sites More sharing options...
R31Nismoid Posted August 28, 2003 Share Posted August 28, 2003 Also see what they think of the balancer issue? maybe they have their own thoughts? good info guys Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-505577 Share on other sites More sharing options...
Steve Posted August 28, 2003 Share Posted August 28, 2003 Paul, dont forget! Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-506305 Share on other sites More sharing options...
rev210 Posted September 1, 2003 Share Posted September 1, 2003 Paul , Don't forget. Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-510456 Share on other sites More sharing options...
GTS-t VSPEC Posted September 1, 2003 Share Posted September 1, 2003 Whoops, completely slipped my mind, will try and get up there this arvo:D Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-510484 Share on other sites More sharing options...
rev210 Posted September 8, 2003 Share Posted September 8, 2003 paul, dont forget. Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-520063 Share on other sites More sharing options...
benm Posted September 8, 2003 Share Posted September 8, 2003 Whats the difference between what you guys are talking about here and Ex Cam Gears (Pulley) ? /hints at participation in a groupbuy. Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-520087 Share on other sites More sharing options...
Ronin 09 Posted September 8, 2003 Share Posted September 8, 2003 the pulleys are the things that the drive belts hang off at the front of the engine - they drive the AC/PS/Alt. The ex cam gears are the gears at the front of each cam that the timing (cam) belt spin to actuate the cams. Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-520095 Share on other sites More sharing options...
sidewaymambo Posted September 8, 2003 Share Posted September 8, 2003 paul, how's going? Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-520484 Share on other sites More sharing options...
Steve Posted September 8, 2003 Share Posted September 8, 2003 I do believe Paul is somewhere between Perth and Adeliade at the moment, looks like we're waiting a bit longer. Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-520495 Share on other sites More sharing options...
Gradenko Posted September 23, 2003 Share Posted September 23, 2003 Paul, you've forgotten, haven't you? Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-541934 Share on other sites More sharing options...
B-Man Posted September 23, 2003 Share Posted September 23, 2003 My engine in bits right now - keen to know what's doing with this . Cheers, Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-541939 Share on other sites More sharing options...
Simonster Posted September 24, 2003 Share Posted September 24, 2003 When I built my RB25 I used an alloy water pump pully to reduce weight and made it a few cm lager in diameter to reduce the possibility of cavitation. Also used a custom flywheel as well, about 3kg lighter than standard. Although I'm yet engine run the engine as I'm waiting to source my turbo, I can't offer any benefits or downsides. My thoughts would be to reduce weight of the flywheel, but reducing it too much, say greater than 4-5kg, will reduce the rotational mass too much for the street and torque off boost will be reduced. Can't say how by much but my engine builder said that any more than 5kg is pointless on a street car. Link to comment https://www.sau.com.au/forums/topic/23312-rb25-pulleys/page/3/#findComment-541987 Share on other sites More sharing options...
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