Delberts Wallet Posted February 19, 2003 Share Posted February 19, 2003 Went out last night in the 7 to the northants meeting and thought the car was running very well (the shift light were coming on quite quickly) I guess this was down to the sub zero (thats what it felt like ) temperetures. If so how much difference does it make having cold air going into the engine 🤔 Blue and Carbon Supersport Edited by - gareth harrold on 19 Feb 2003 18:46:48 Link to comment Share on other sites More sharing options...
TomB Posted February 19, 2003 Share Posted February 19, 2003 Makes a noticable difference i find, especially if its dark as well! Link to comment Share on other sites More sharing options...
KenEvans Posted February 19, 2003 Share Posted February 19, 2003 Is dark air a lot more dense then Tom? Link to comment Share on other sites More sharing options...
rossybee Posted February 20, 2003 Share Posted February 20, 2003 The darker the better. Much heavier & therefore more dense Ross very black SuperSport Link to comment Share on other sites More sharing options...
TomB Posted February 20, 2003 Share Posted February 20, 2003 Dark air is also louder!! 😬 I recall a winter blat I had earlier in the year back from the Cheshire meet at 11pm in very minus temps, with the engine pulling very strongly & popping on the downshift. Chilly though!! Link to comment Share on other sites More sharing options...
KevSull Too Posted February 21, 2003 Share Posted February 21, 2003 Seem to get a lot of this dark, dense, loud air in the lanes....I've never seen much of it collecting around motorways.............strange.......... 😬You laugh at me because I'm different, I laugh at you because you're all the same. 😬 Link to comment Share on other sites More sharing options...
mark4newman Posted February 21, 2003 Share Posted February 21, 2003 don't be tempted by the dark side... Su77on Se7enS M100EOW.... Link to comment Share on other sites More sharing options...
Steve-B Posted February 21, 2003 Share Posted February 21, 2003 use the force Gareth cold air good, alpine dark cold air at 6-8000 feet better 😬 Steve Metalic Black SV-VHPD click here to see our pictures.... Link to comment Share on other sites More sharing options...
Delberts Wallet Posted February 21, 2003 Author Share Posted February 21, 2003 Right ,all I need to do now is install a fridge and a black light and I'm sorted. Blue and Carbon Supersport Link to comment Share on other sites More sharing options...
rossybee Posted February 21, 2003 Share Posted February 21, 2003 Drive at sea-level. The air gets less dense as you ascend. Surely driving at night gives a feeling of increased speed due to lack of surrounding noise, reduced visiblity, etc... So, midnight beach-sprints, anyone 🤔 Ross very black 6spd SuperSport Link to comment Share on other sites More sharing options...
mark4newman Posted February 21, 2003 Share Posted February 21, 2003 why not drive below sea level? Su77on Se7enS M100EOW.... Link to comment Share on other sites More sharing options...
Chelspeed Posted February 21, 2003 Share Posted February 21, 2003 PV/RT=P2V2/RT2 or something. Less temp (thats T....) means more air in a given volume as T's on the bottom. Halving T means twice the air in the engine so twice the power (roughly, all other things remaining equal etc etc). Sadly T is absolute so you need to add 273K to the degC so 0 degC is only 10% better than 30 degC, 273K against 303K. Still power for nothing. Link to comment Share on other sites More sharing options...
Peter Carmichael Posted February 21, 2003 Share Posted February 21, 2003 Combustion heat transfer to the charge is more efficient with cold air. This has more effect than density because the heat transfer has to do with relative temperatures rather than absolute. Simply speaking, when combustion takes place, the heat has a choice as to whether to go into the compressed charge or go into the cylinder walls, piston and valves. The hotter the charge to start with, the less attractive it is to the combustion heat and the more heat gets rejected into the surrounding metal. Density plays against you in terms of aerodynamic drag. Link to comment Share on other sites More sharing options...
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