Greatness of Desmodromic and Pneumatic
Friday, January 16, 2009
More and more revolution height of engine, also generates problem at spring which is in the form of this spiral. Spring must run rings round. Though spiral made of by this metal has harmonious frequency. If exceeding the performance ridge, spring would broken. Component around his moult and engine can no longer work.
Because that is, at certain public automobiles engine with higher revolution or sport characteristic is applied by two springs. Despitefully, because valve component made of metal, when the scale temperature changes. This condition causes, aperture between valves with the pelatuk differs in and influences engine work. This also delivering birth valve hidraulik. At type this, valve aperture when chilling and same temperature because arranged automatically by dividing valve oli engine.
In reality, engine using two spiral springs also have not yet enough fulfilled desire of the engine engineers, especially they dabbling in race-tracks. The reason is, in that arena engine capacities is limited. And engine must be able to mobilize energy equal to possible that automobile raceed to be faster.
Example, engine F1 having capacities 2400 cc, can yield energy 850 hp. revolution of Engine reachs 14000 – 15000 rpm, even can exceed between 18000 – 20000 rpm. Usage per mechanic valve or hidraulik at condition of like that cannot be pledged again.
Desmodromic
Hence bearing new kreasi, that is Desmodromic (at motor) and pneumatic valve at engine F1 and motogp (now again tried Honda). Enunciated, both pari pasus applies engine 4 pace.
Desmodromic, now applied at Ducati, shall no longer apply spiral spring to return valve to position of initialy after nuzzled by cam. But using cam and helper to push valve. This system assumed more simplely but remain to be just had limitation because working mechanically.
Pneumatic
Assessed more mumpuni but complicated and expensive in price. This also causing the application of his is limited in race-tracks. At pneumatic valve, spiral spring task replaced by tube to contain high pressured gas. The work principle equal to sokbreker gas. Gas type applied same, that is nitrogen.
This gas selected by the stability line height to temperature influence. Even so, because very engine temperature height, dividing valve can change drastically. To overcome it, system equiped with wind blow off valve.
Even the principle the work simple, doesn't generate abrasion at circuit differ from valve. Pneumatic requires sil or a real partition reliable. The reason is pneumatic circuit dividing valve reachs 2500 psi (170 bars). If when the sil damage, engine history finish has to race and this often happened in race-tracks F1.
Pneumatic valve first time applied by Renault at engine RVS-9. At that time attached at automobile Lotus applied by Ayrton Sena in the early of season to race 1986. revolution of Engine Renault time had reached 19000 rpm.
Because complicated of pneumatic valve system and still applies cam or kem (cam), actually the machinists has found other system that is elektro hidraulik and electromagnetic. Simply, till now has not can be pledged. In consequence, pneumatic valve assessed is the existing as the top.
But definitive, effort for the engine engineers have never desists gets valve that is more and more efficient worked it. This also as according to energy conversion demand and area. (Kompas)
Because that is, at certain public automobiles engine with higher revolution or sport characteristic is applied by two springs. Despitefully, because valve component made of metal, when the scale temperature changes. This condition causes, aperture between valves with the pelatuk differs in and influences engine work. This also delivering birth valve hidraulik. At type this, valve aperture when chilling and same temperature because arranged automatically by dividing valve oli engine.
In reality, engine using two spiral springs also have not yet enough fulfilled desire of the engine engineers, especially they dabbling in race-tracks. The reason is, in that arena engine capacities is limited. And engine must be able to mobilize energy equal to possible that automobile raceed to be faster.
Example, engine F1 having capacities 2400 cc, can yield energy 850 hp. revolution of Engine reachs 14000 – 15000 rpm, even can exceed between 18000 – 20000 rpm. Usage per mechanic valve or hidraulik at condition of like that cannot be pledged again.
Desmodromic
Hence bearing new kreasi, that is Desmodromic (at motor) and pneumatic valve at engine F1 and motogp (now again tried Honda). Enunciated, both pari pasus applies engine 4 pace.
Desmodromic, now applied at Ducati, shall no longer apply spiral spring to return valve to position of initialy after nuzzled by cam. But using cam and helper to push valve. This system assumed more simplely but remain to be just had limitation because working mechanically.
Pneumatic
Assessed more mumpuni but complicated and expensive in price. This also causing the application of his is limited in race-tracks. At pneumatic valve, spiral spring task replaced by tube to contain high pressured gas. The work principle equal to sokbreker gas. Gas type applied same, that is nitrogen.
This gas selected by the stability line height to temperature influence. Even so, because very engine temperature height, dividing valve can change drastically. To overcome it, system equiped with wind blow off valve.
Even the principle the work simple, doesn't generate abrasion at circuit differ from valve. Pneumatic requires sil or a real partition reliable. The reason is pneumatic circuit dividing valve reachs 2500 psi (170 bars). If when the sil damage, engine history finish has to race and this often happened in race-tracks F1.
Pneumatic valve first time applied by Renault at engine RVS-9. At that time attached at automobile Lotus applied by Ayrton Sena in the early of season to race 1986. revolution of Engine Renault time had reached 19000 rpm.
Because complicated of pneumatic valve system and still applies cam or kem (cam), actually the machinists has found other system that is elektro hidraulik and electromagnetic. Simply, till now has not can be pledged. In consequence, pneumatic valve assessed is the existing as the top.
But definitive, effort for the engine engineers have never desists gets valve that is more and more efficient worked it. This also as according to energy conversion demand and area. (Kompas)
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