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Deutz Ecke
Deutz / Deutz-Fahr Schlepper
D05-Serie
Safely removing injectors / nozzles
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<blockquote data-quote="evranch_canada" data-source="post: 632659" data-attributes="member: 38688"><p>Hi Kai,</p><p></p><p>I was surprised myself, so did multiple tests to confirm. Each cylinder was sampled twice in a row, and then I did 2 sweeps across the bank. i.e. 1234 4321 to ensure the results were not affected by oil control or heat of compression. The battery was connected to a powerful old-style charger for constant cranking speed. Total of 4 samples per cylinder, all results were consistent. All glow plugs were removed, of course.</p><p></p><p>That was my initial thought too, like in a gas engine the lowest pressure should be cold and sooty due to weak combustion. That's why I was wondering if in an indirect diesel, is it possible that lower compression results in effective timing retard as the pressure rises later? </p><p></p><p>I've worked more with direct injection and am not sure on the exact dynamics of injection timing with pre-combustion chambers. I have read that sometimes the injector can actually spray before ignition pressure is reached, depending on chamber design. Maybe not in these engines though, this is my only 812, you would know better than me! I am here to learn.</p><p></p><p>Alex</p></blockquote><p></p>
[QUOTE="evranch_canada, post: 632659, member: 38688"] Hi Kai, I was surprised myself, so did multiple tests to confirm. Each cylinder was sampled twice in a row, and then I did 2 sweeps across the bank. i.e. 1234 4321 to ensure the results were not affected by oil control or heat of compression. The battery was connected to a powerful old-style charger for constant cranking speed. Total of 4 samples per cylinder, all results were consistent. All glow plugs were removed, of course. That was my initial thought too, like in a gas engine the lowest pressure should be cold and sooty due to weak combustion. That's why I was wondering if in an indirect diesel, is it possible that lower compression results in effective timing retard as the pressure rises later? I've worked more with direct injection and am not sure on the exact dynamics of injection timing with pre-combustion chambers. I have read that sometimes the injector can actually spray before ignition pressure is reached, depending on chamber design. Maybe not in these engines though, this is my only 812, you would know better than me! I am here to learn. Alex [/QUOTE]
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Deutz Ecke
Deutz / Deutz-Fahr Schlepper
D05-Serie
Safely removing injectors / nozzles
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