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Re: Montare sonda + ceas EGT ZD30
Draga Luigi :))
Daca vorbim de benzinare, ai dreptate, am scris si eu mai sus.
Daca vorbim de diesel, nu ai dreptate! Hai sa incercam :) .. chair si un mic pariu putem pune:)
Nu zic ca nu esti bun in ceea ce faci si ca nu stii mult mai multe, dar la partea cu debitul crescut la diesel absolut deloc nu ai dreptate!
Legat de topitul pistoanelor ... are mare legatura! Cu atita experienta cum sa spui ca nu are legatura :))? Acuma serios!?!
Motivul principal pentru care se duc 3.0 fiind de la temepraturile prea mari, in lipsa de aer (presiune turbo scazuta de la electorvalva ce comanda geometria), nu in cresterea de debit.
Poate ai fost indus in eroare cautand acest lucru pe google si pe primul site un nestiutor spune ca e fix invers ;).... realitate insa este alta.
" AIR FUEL RATIOS IN DIESEL ENGINES
The stoichiometric air-to-fuel ratio for the combustion of diesel fuel is 14.6 : 1. At this ratio, all fuel present will theoretically react with all air present and combust completely. However, a diesel engine is unique from other internal combustion cycles in that it can operate within a wide spectrum of A/F ratios without adverse complications (spark plugs fowling in gas engines running rich, for example). A diesel engine will tend to run relatively cool when the A/F ratio is lean, or greater than stoichiometric. For a lean condition, there is an excessive amount of air available, although in theory all the available fuel is combusted. On the contraire, a diesel engine will have a tendency to run relatively hot when the A/F ratio is rich, or less than stoichiometric. During a rich condition, there is an excessive amount of fuel available, and therefore not enough oxygen to combust all the fuel completely. As a result, running rich results in the emittance of soot (black smoke) from the tailpipe. The richer the A/F ratio, the more smoke created and the hotter the exhaust gas temperature (EGT) becomes.
In practice, a diesel engine cannot completely burn fuel at a stoichiometric A/F ratio. This phenomenon stems from the fact that diesel and air are not ignited as a homogeneous mixture in the combustion chamber - the air and fuel only mix after fuel has been injected and nearly instantaneously auto ignites. Thus, there is simply not enough time for fuel and air to mix and combust entirely at a stoichiometric A/F ratio in a compression ignition engine. Since unburnt and/or partially burned fuel is essentially wasted engine, diesel engines typical operate lean of the stoichiometric ratio.
With regards to exhaust gas temperature, the richer the A/F mixture, the higher the EGT and the greater the amount of black smoke (soot) produced. Smoke has a tendency to appear as a light haze in the 16-18: 1 A/F range, but EGTs tend to be manageable under these conditions. However, as the A/F drops and the smoke begins thicker, EGTs can spike to dangerous levels."
Sursa: http://www.dieselhub.com/performance/egt.html
Postat în original de nissan4x4
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Draga Luigi :))
Daca vorbim de benzinare, ai dreptate, am scris si eu mai sus.
Daca vorbim de diesel, nu ai dreptate! Hai sa incercam :) .. chair si un mic pariu putem pune:)
Nu zic ca nu esti bun in ceea ce faci si ca nu stii mult mai multe, dar la partea cu debitul crescut la diesel absolut deloc nu ai dreptate!
Legat de topitul pistoanelor ... are mare legatura! Cu atita experienta cum sa spui ca nu are legatura :))? Acuma serios!?!
Motivul principal pentru care se duc 3.0 fiind de la temepraturile prea mari, in lipsa de aer (presiune turbo scazuta de la electorvalva ce comanda geometria), nu in cresterea de debit.
Poate ai fost indus in eroare cautand acest lucru pe google si pe primul site un nestiutor spune ca e fix invers ;).... realitate insa este alta.
" AIR FUEL RATIOS IN DIESEL ENGINES
The stoichiometric air-to-fuel ratio for the combustion of diesel fuel is 14.6 : 1. At this ratio, all fuel present will theoretically react with all air present and combust completely. However, a diesel engine is unique from other internal combustion cycles in that it can operate within a wide spectrum of A/F ratios without adverse complications (spark plugs fowling in gas engines running rich, for example). A diesel engine will tend to run relatively cool when the A/F ratio is lean, or greater than stoichiometric. For a lean condition, there is an excessive amount of air available, although in theory all the available fuel is combusted. On the contraire, a diesel engine will have a tendency to run relatively hot when the A/F ratio is rich, or less than stoichiometric. During a rich condition, there is an excessive amount of fuel available, and therefore not enough oxygen to combust all the fuel completely. As a result, running rich results in the emittance of soot (black smoke) from the tailpipe. The richer the A/F ratio, the more smoke created and the hotter the exhaust gas temperature (EGT) becomes.
In practice, a diesel engine cannot completely burn fuel at a stoichiometric A/F ratio. This phenomenon stems from the fact that diesel and air are not ignited as a homogeneous mixture in the combustion chamber - the air and fuel only mix after fuel has been injected and nearly instantaneously auto ignites. Thus, there is simply not enough time for fuel and air to mix and combust entirely at a stoichiometric A/F ratio in a compression ignition engine. Since unburnt and/or partially burned fuel is essentially wasted engine, diesel engines typical operate lean of the stoichiometric ratio.
With regards to exhaust gas temperature, the richer the A/F mixture, the higher the EGT and the greater the amount of black smoke (soot) produced. Smoke has a tendency to appear as a light haze in the 16-18: 1 A/F range, but EGTs tend to be manageable under these conditions. However, as the A/F drops and the smoke begins thicker, EGTs can spike to dangerous levels."
Sursa: http://www.dieselhub.com/performance/egt.html
, mi-as permite cu permisunea celor care sunt declarati sau nedeclarati fani ai ... sau altor gauri (nu pot sa scriu, m-am abtinut e de bine 
(desigur paia din clanul Toyota sau alte secte cu alte toroape ii vrem aproape doar cand e nevoie sa punem sufa pe ei sa-i scoatem din mizerie)
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