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Compresie

#1 User is offline   RobyL24 

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Posted 08 February 2019 - 19:17

Oare stie cineva cat trebuie sa fie compresia la 3.0d .autodata zice intre 10-18 bari,am mai citit pe undeva ca 265 psi adica 18 bar.asa sa fie?
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#2 User is offline   calinus68 

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Posted 08 February 2019 - 20:16

Poate ai vtrut sa spui intre 18- 20+, la 10 bari e compresie de benzinar.
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#3 User is offline   RobyL24 

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Posted 08 February 2019 - 20:44

10-18 bar .pe autodata si haynes.asta era intrebarea daca a mai masurat cineva?
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#4 User is offline   calinus68 

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Posted 08 February 2019 - 21:03

Valoarea 18:1 reprezinta raportul dintre volumul maxim al cilindrului, cu pistonul la punctul mort inferior (BDC), si volumul minim al cilindrului, cu pistonul la punctul mort superior (TDC)

O lege importanta a termodinamicii spune ca raportul PV/T este constant, adica PV/T la BDC egal cu PV/T la TDC. Daca se aplica anumite corectii (nu avem gaz ideal), si daca se calculeaza cresterea de temperatura cu micsorarea volumului, se obtine valoarea presiunii la punctul mort superior. Ca date de intrare avem raportul de compresie de 18:1, unde volumul maxim este mai mare de 18 ori fata de volumul minim, presiunea la BDC egala cu presiunea atmosferica si temperatura la BCD 25grdC.
Producatorul specifica Compression ratio 18 , dar cine stie sa o transform in valoarea masurata bari.

This post has been edited by calinus68: 08 February 2019 - 21:08

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#5 User is offline   unvicont 

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Posted 08 February 2019 - 22:45

La M57: Compression ratio 18:1, compression 20 - 25 bar (operating temperature) ... citire de la BMW AG, Service Training
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