Hverventreff Tisdag den 11:e december!

[Børre N17]

Øh, mulig jeg er litt treig, men blir det 10. eller 11.?

[Johan N828]

Det blir Tirsdag den 11 =)

Noe spess tema eller?

//J

[Petter 900 T]

Det blir Tirsdag den 11 =)

Noe spess tema eller?

//J

Tirsdag førstkommende ja! Tema, V-E

Petter

[zero900t]

Yee tirsdag kan jeg

Så jeg kommer

[Morti]

Kan hende jeg er litt blond, men hva er "V-E" ?

[Petter 900 T]

Kan hende jeg er litt blond, men hva er "V-E" ?

Volumetric efficiency in internal combustion engine design refers to the efficiency with which the engine can move the charge into and out of the cylinders. More correctly, volumetric efficiency is a ratio (or percentage) of what volume of fuel and air actually enters the cylinder during induction to the actual capacity of the cylinder under static conditions. Therefore, those engines that can create higher induction manifold pressures - above ambient - will have efficiencies greater than 100%. Volumetric efficiencies can be improved in a number of ways, but most notably the size of the valve openings compared to the volume of the cylinder and streamlining the ports. Engines with higher volumetric efficiency will generally be able to run at higher RPM and produce more overall power due to less parasitic power loss moving air in and out of the engine.

There are several standard ways to improve volumetric efficiency. A common approach for manufacturers is to use a larger valves or multiple valves. Larger valves increase flow but weigh more. Multi-valve engines combine two or more smaller valves with areas greater than a single, large valve while having less weight. Carefully streamlining the ports increases flow capability. This is referred to as Porting and is done with the aid of an air flow bench for testing.

Today, automobile engines typically have four valves per cylinder. Many high performance cars in the 1970s used carefully arranged air intakes and "tuned" exhaust systems to "push" air into and out of the cylinders, making use of the resonance of the system. Two-stroke engines take this concept even further with expansion chambers that returns the escaping air-fuel mixture back to the cylinder. A more modern technique, variable valve timing, attempts to address changes in volumetric efficiency with changes in RPM of the engine: at higher RPM the engine needs the valves open for a greater percentage of the cycle time to move the charge in and out of the engine.

Volumetric efficiencies above 100% can be reached by using forced induction such as supercharging or turbocharging.

More "radical" solutions include the sleeve valve design, in which the valves are replaced outright with a rotating sleeve around the piston, or alternately a rotating sleeve under the cylinder head. In this system the ports can be as large as necessary, up to that of the entire cylinder wall. However there is a practical upper limit due to the strength of the sleeve, at larger sizes the pressure inside the cylinder can "pop" the sleeve if the port is too large.

Volumetric Efficiency is frequently abbreviated as "VE" when discussing engine efficiency.

Ok?

Petter

[Morti]

Med andre ord så blir temaet "trimming"? Makan til avansert det skulle værra da .. dere kan få sagt det

[Isdahl N1069]

Ser ut til at Tirsdag passer for de fleste, men jobber da. Så onsdag hadde passet bedre for meg

[Saab900STCR]

Då ändrar jag topic!

Mvh

[Johan N828]

*bump*
For og minne om treffet=)

//J

[Jørgen N1032]

Kommer jeg og, men rekker nok ikke å være dær før sju.

[Myrt N610]

Jobber desverre kveldsvakt så rekker ikke å komme idag

[zero900t]

Da er spørsmålet, når møtes i på shell for vi som skal dra fra Drammen?????

mener vi har møtt rundt kl 17.00 før skal vi det nå også


EDIT:

Prata med anders nå.

Møtes klokka 17.00 på Shell ved Kjelstad(gamle lierbommen)

Ses da så er det bare å møte opp