 Azot in cauciucuri |
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 Apr 19 2006, 01:56 PM
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#21
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 Road Runner  Group: Members Posts: 3,336 Joined: 17-October 05 From: La dreacu' Member No.: 9 Car: BMW E30 08/90 Engine: 08/94 M42 318iST  |
Un lucru care l-am observat: am pus azot in rotile de vara la inceputul verii trecute, iarna le-am pus la pastrare si acum 3 saptamani le-am pus din nou pe masina si le-am verificat presiunea si nu au fost pierderi semnificative.(0.1)
-------------------- 16 valves, 24 hours a day, 1bar boost. A vulgar display of power. Making boost since 30-06-2008. |
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Apr 19 2006, 11:26 PM
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#22
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0% BMW corupt Group: Members Posts: 43 Joined: 11-April 06 Member No.: 249 |
QUOTE (jaffar) principalul atu al azotului pentru cauciucuri este acela ca nu este afectat de schimbarile de temperatura, deci presiunea in roti ramine aproape constanta tot timpul anului si in orice conditii.
Fizica e de alta parere ... O remarca, gresita dar frecventa, legata de azot este ca anvelopele umplute cu acest gaz si-ar schimba mai putin presiunea in functie de temperatura. Adica ca azotul ar fi mai putin dependent de temperatura. FALS. Toate gazele se supun legii Gay Lussac : La un volum constant presiunea si temperatura absoluta a unui gaz sint direct proportionale. Deci nu conteaza gazul, poate fi aer, heliu, azot, toate au aceeasi variatie de presiune in functie de temperatura. Daca la 20 grade C avem 2 atm., la 40 grade C presiunea va fi : 2 atm. x ( 313K/293K) = 2.13 atm Presiune creste cu 0.13 atmosfere |
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Apr 20 2006, 10:04 AM
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#23
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82% BMW corupt Group: Members Posts: 871 Joined: 23-October 05 From: bucuresti Member No.: 49 Car: E30 Engine: S54 3.2 343 cp |
paul are dreptate, pt cine nu crede sa verifice manualul de clasa a 11-a de fizica 
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Apr 20 2006, 10:21 AM
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#24
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 100% BMW corupt Group: Administrators Posts: 8,513 Joined: 17-October 05 From: Bucuresti Member No.: 7 Car: E28 525i Engine: M30 2.5 147cp |
Si eu tind sa-i dau dreptate lu Paul, cu o observatie legata de calculul facut:
presiunea din formula trebuia sa fie 3 atm (2 atm in cauciuc diferenta fata de presiunea atmosferica, plus o atmosfera) Oricum, ideea e aceeasi. Cine demonstreaza ca azotul are caldura specifica mai mare decat aerul? Chiar daca s-ar demonstra lucrul asta, dupa o perioada suficient de mare de timp, temperaturile pneu aer vs pneu azot se egalizeaza, avantaje putand sa apara doar la burn-uri (fie ca sunt pe accelerare fie pe franare) cand temperatura cauciucului creste brusc si apoi scade repejor. -------------------- Inline 6 in a 5-er 4 ever
E28 528i, E39 525i touring, E39 520i touring, E53 X5 4.4i, E70 X5 3.0si, E46 318i ex E39 520i exclusive, E39 525tds, E46 318d touring, E28 525i, E34 525i, E28 524td, E30 318i, E28 525i |
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Apr 20 2006, 10:25 AM
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#25
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100% BMW corupt Group: Insiders Posts: 4,486 Joined: 18-October 05 Member No.: 15 Car: E30 Engine: M42 |
Aaaaaa deci e bun la cercuri?
 :unibrow:
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Apr 20 2006, 10:27 AM
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#26
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100% BMW corupt Group: Administrators Posts: 8,513 Joined: 17-October 05 From: Bucuresti Member No.: 7 Car: E28 525i Engine: M30 2.5 147cp |
Daca azotul are caldura specifica mai mare decat aerul la ~3 atm, da. -------------------- Inline 6 in a 5-er 4 ever
E28 528i, E39 525i touring, E39 520i touring, E53 X5 4.4i, E70 X5 3.0si, E46 318i ex E39 520i exclusive, E39 525tds, E46 318d touring, E28 525i, E34 525i, E28 524td, E30 318i, E28 525i |
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Apr 20 2006, 10:30 AM
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#27
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100% BMW corupt Group: Administrators Posts: 8,513 Joined: 17-October 05 From: Bucuresti Member No.: 7 Car: E28 525i Engine: M30 2.5 147cp |
uite ca asta n-o stiu sigur, dar traiam cu impresia asta...
-------------------- Inline 6 in a 5-er 4 ever
E28 528i, E39 525i touring, E39 520i touring, E53 X5 4.4i, E70 X5 3.0si, E46 318i ex E39 520i exclusive, E39 525tds, E46 318d touring, E28 525i, E34 525i, E28 524td, E30 318i, E28 525i |
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Jun 20 2006, 11:03 PM
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#28
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 CSL fan Group: Insiders Posts: 1,944 Joined: 11-December 05 From: Bucharest, Pta. Romana Member No.: 120 Car: e39 530da touring Engine: 3.0D |
eu stiu k si pneurile de formula 1 sunt umplute cu azot tot din cauza faptului ca nu isi schimba volumul la diferente de temperatura.
--------------------  www.printareieftina.uv.ro - Servicii dtp, printare, copiere si multe altele |
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Jun 23 2006, 11:54 PM
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#29
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0% BMW corupt Group: Members Posts: 43 Joined: 11-April 06 Member No.: 249 |
QUOTE (n3o) eu stiu k si pneurile de formula 1 sunt umplute cu azot tot din cauza faptului ca nu isi schimba volumul la diferente de temperatura.
Nu confunda stiinta cu credinta
Ai cam chiulit la fizica 
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Jun 24 2006, 01:02 AM
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#30
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CSL fan Group: Insiders Posts: 1,944 Joined: 11-December 05 From: Bucharest, Pta. Romana Member No.: 120 Car: e39 530da touring Engine: 3.0D |
nu ... doar k nu prea am trecut pe la ea 
-------------------- www.printareieftina.uv.ro - Servicii dtp, printare, copiere si multe altele |
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