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Originally Posted by dcb
What's the issue? a particulate trap?
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Injecting BD into the cylinder in the exhaust phase.
BD doesn't vaporize enough in this phase,and gets into the oil, thus increasing the oil level .
BD doesn't evaporate from the oil as diesel does, so it stays in there and degrades the oil.
It's not really an engine issue, it's an emissions control equipment issue causing an engine problem.
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given this is a modder forum too, mebbe we should talk about workarounds.
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The only options are another method of clearing the DPF - which isn't easy to implement - or its removal - which is illegal and pumps out soot.
Running lower % blends also works, but oil quantity and quality needs to be monitored.
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Would cutting the duty cycle of the after injector by 50% fix it?
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It only delays the process.
It doesn't cure it.
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But if it is downstream of the engine then it sounds like there may be an easy fix. And yes it sounds like a huge step backwards for VW if it isn't something easy to work around.
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It's pretty easy to workaround.
All they need is a dedicated injector between the exhaust and the DPF - i.e. not injecting in the cylinder.
Only problem is it'd cost a lot if it were to require a second CR / high pressure fuel system for that injector.
Putting the DPF really close to the engine, might offer a chance to run the DPF-injector right off the engine's CR - that requires a complete engine bay rearrangement and it'd get pretty crowded there.
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The new VWs seems to "run" fine on b100 anyway
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DPF-equiped TDi's don't.
The engine itself does, the rest of the emissions system doesn't.
Dunno about the US situation, but in Europe DPFs were introduced on Euro4 diesels - though depending on the market, not all Euro4 diesels have them.
Euro5 diesels all have DPF.
The best solution would be to legally force diesel engine builders into B100 compatability at short notice.
We can't have them rule out B100 as an alternative fuel.