Matthew Newton Posted February 12, 2009 Share Posted February 12, 2009 I've just read 7FAQ ' Lighten my Car'; although it makes sence that reducing the rotional mass is more benefical to 7 acceleration v than reducing the same weight reduction of 'fixed' mass. 🤔My question is: Which is the most beneficial / cost effective option in rotional mass reduction? Wheel & tyres / flywheel / clutch pressure plate / prop shaft / drive shafts or brake discs? Ali / BRG 1400 SS on the loose! Link to comment Share on other sites More sharing options...
6speedmanual Posted February 12, 2009 Share Posted February 12, 2009 Hi Matthew Unless you are already running the lightest possible wheel/tyre combo, this is the quickest cheapest most effective place to start.  All the other options require greater amount of disassembly/refitting time, cost and comparitively smaller gains.  To get more from your 1400SS (sweet) non rotating masses are also very sgnificant. The windscreen is an easy target as it is very heavy and also gives a lot of drag.  Good luck in building your super revvy fizzy lightweight low flying machine.  Peter    6SpeedManual *tongue*There's no such thing as too much BHP per Ton 😬 Link to comment Share on other sites More sharing options...
Matthew Newton Posted February 12, 2009 Author Share Posted February 12, 2009 Current wheel / tyres are 13" minilites with A021's. Are there ligher combo options? When refering to static mass, surely the cheapest solution is to easy off the beers and loose a few pounds?  Ali / BRG 1400 SS on the loose! Link to comment Share on other sites More sharing options...
taffyracer Posted February 13, 2009 Share Posted February 13, 2009 interesting, I've been searching for similar info, anybody have actual comparative weights of minilites v superlight wheels? http://www.xlraceparts.com Link to comment Share on other sites More sharing options...
Support Team Shaun_E Posted February 13, 2009 Support Team Share Posted February 13, 2009 Change to Avon CR500 tyres - this is the biggest step as they are much lighter than Yokos or similar. Caterham 8 spoke 13" wheels would then be the second step. The difference between an 8 spoke with CR500 and a minilight with Yoko is massive. Yellow SL #32 - member of Drowned Rat Racing Link to comment Share on other sites More sharing options...
stephen grant Posted February 13, 2009 Share Posted February 13, 2009  You can save 8Kg by removing the heater, if you have one. A lightened flywheel saves a bit. Dave Andrews always points out that most k-series have a useless 2kg lump of metal sitting on the front, completely surplus to requirements. As pointed out above, the screen is quite heavy, if you are happy to go aero. I think (stand to be corrected) that Mike Barnby makes very light wheels which come up for sale periodically here. You can go on for ever. I think Richard Meaden got his Fireblade down to 380kg or something bonkers like that, but you have to start throwing a lot of money at carbon fibre bodywork. As you point out, it's cheaper for the driver to lose some weight. stephen Link to comment Share on other sites More sharing options...
Area Representative Richard Price Posted February 13, 2009 Area Representative Share Posted February 13, 2009 You can save 8Kg by removing the heater *eek* Surely the plastic heaters do not weigh that much 🤔   Link to comment Share on other sites More sharing options...
djg Posted February 13, 2009 Share Posted February 13, 2009 *arrowup*No but the water in it and in the hoses to it is. Doug Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted February 13, 2009 Share Posted February 13, 2009 8kg ????? not 2 feet of 16mm bore hose and water. Perhaps it is 'heavy water' ?! The fire hose we work with is 19mm bore x 32mm o/dia - even that full of water is only around 1.1kg per metre !  Link to comment Share on other sites More sharing options...
stephen grant Posted February 13, 2009 Share Posted February 13, 2009  I must confess; I've never weighed the heater, full of water, with assocated hoses, valves, etc.; I definately read a couple of times on b/c that it was an 8kg saving, but I never checked this and it does seem like a big number now you mention it.... stephen Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted February 13, 2009 Share Posted February 13, 2009 Reducing rotating mass - if you have a fat wallet that needs lightening - consider a carbon-fibre propshaft from RiF Carbon Bits. See advert in LF - page 7 this month. Not cheap though !  Link to comment Share on other sites More sharing options...
Matthew Newton Posted February 13, 2009 Author Share Posted February 13, 2009 Also my seven hasn't got a heater, so that was 8Kg saved in the bag already.. 😬 Ali / BRG 1400 SS on the loose! Link to comment Share on other sites More sharing options...
Bricol Posted February 13, 2009 Share Posted February 13, 2009 Remembering an advert played in Applebees dinery place in the US, at lunchtime, if you shove a hosepipe up your bum, turn on the tap, you can flush out rather a large amount of compacted material . . . a few kilogrammes in-fact . . .  ALthough I guess they probably wanted you to buy their special kit rather than visit BnQ. Bri Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted February 13, 2009 Share Posted February 13, 2009 Sounds a lovely thing to play in a diner ??? Â Â Link to comment Share on other sites More sharing options...
Paul McKenzie Posted February 13, 2009 Share Posted February 13, 2009 Barnby mags and ACB10's are by far the lightest wheel/tyre combo....and they make it easy to follow trams with both hands off the wheel  Paul Link to comment Share on other sites More sharing options...
Pat the Plumber Posted February 13, 2009 Share Posted February 13, 2009 1 litre of water equals 1kg, i think  my R400 Link to comment Share on other sites More sharing options...
Julian Thompson Posted February 13, 2009 Share Posted February 13, 2009 ....I did this once. Not advisable. It's a slippery slope that will leave you a lot lighter in the pocket as well as on the scales... 😬 Link to comment Share on other sites More sharing options...
Old Git Posted February 13, 2009 Share Posted February 13, 2009 Yes - you can cross check this as "a pint of water weighs a pound and a quarter" and 1 kg = 2.2 lbs and 1 pint =... etc etc. expressed in penny farthings per furlong fortnight... Tim N Link to comment Share on other sites More sharing options...
JampJ Posted February 14, 2009 Share Posted February 14, 2009 A serious point is in fact loosing body weight, jockeys do it! Cheers John JFDI (Just F*****g Do It) Link to comment Share on other sites More sharing options...
Fishy Dave Posted February 14, 2009 Share Posted February 14, 2009 Hi Matthew, I have a 1400SS too  Following the link to your website, I notice the gallery pic still shows you have the spare wheel and carrier attached? If they are still on there then remove both, I did. Also consider changing your comfy seats for tillets, they do come up second hand from time to time, remove the carpets whilst you're at it.  I have just fitted an aeroscreen (first drive with it tomorrow), and was amazed at the weight of the windscreen and surround. None of these things are rotational weight, but would all add up to a fair bit.  Dave  David Smitheram, Wiltshire (South) AR, 07718 368173. 1400 supersport ex racer Link to comment Share on other sites More sharing options...
irrotational Posted February 14, 2009 Share Posted February 14, 2009 Aeroscreen will make it feel like a different car  Well quite different anyway... 😬 --- my mind is blank.... Link to comment Share on other sites More sharing options...
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