10-08-2021, 06:19 PM
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#231 (permalink)
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It's all about Diesel
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Quote:
Originally Posted by Isaac Zachary
same emissions problems found in diesel engines
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An increase to NOx emissions is still often pointed out as easier to mitigate on a gasser fitted with direct injection than on a Diesel, yet the PM is a real PITA for both. OTOH a gaseous fuel injected at the vapour phase, such as natural gas, won't be so troublesome regarding PM.
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10-08-2021, 07:28 PM
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#232 (permalink)
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High Altitude Hybrid
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Quote:
Originally Posted by cRiPpLe_rOoStEr
An increase to NOx emissions is still often pointed out as easier to mitigate on a gasser fitted with direct injection than on a Diesel, yet the PM is a real PITA for both. OTOH a gaseous fuel injected at the vapour phase, such as natural gas, won't be so troublesome regarding PM.
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That's because the gasser can be run at a stoichiometric AFR and a still very homogenous charge. Yet direct injection with spark ignition lends itself to a lean burning engine with a stratified charge. But it seems most, if not all OEMs are going with the former and not the later in their direct injection engine designs.
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10-09-2021, 01:19 PM
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#233 (permalink)
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AKA - Jason
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Quote:
Originally Posted by cRiPpLe_rOoStEr
An increase to NOx emissions is still often pointed out as easier to mitigate on a gasser fitted with direct injection than on a Diesel, yet the PM is a real PITA for both. OTOH a gaseous fuel injected at the vapour phase, such as natural gas, won't be so troublesome regarding PM.
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PM has the same solution for gas and diesel - particulate filters. Natural Gas has the benefit of not requiring a particulate filter but the downside of needing super expensive fuel tanks that cost way more than a PM filter.
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10-10-2021, 08:02 PM
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#234 (permalink)
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It's all about Diesel
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Quote:
Originally Posted by JSH
PM has the same solution for gas and diesel - particulate filters.
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Which could be avoided on gassers had direct injection not been so increasingly common on them.
Quote:
Natural Gas has the benefit of not requiring a particulate filter but the downside of needing super expensive fuel tanks that cost way more than a PM filter.
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Sure for an OEM it's easier to fit a particulate filter than working around a car to make it dedicated-CNG, and even some newer CNG-capable models available in Europe nowadays might retain a particulate filter as they retain the ability to run on gasoline. But the cost of CNG tanks has not been so much of an issue rendering conversions unsuitable in third-world countries.
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10-11-2021, 12:36 AM
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#235 (permalink)
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AKA - Jason
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Quote:
Originally Posted by cRiPpLe_rOoStEr
Which could be avoided on gassers had direct injection not been so increasingly common on them.
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Direct injection is required for emissions, performance and fuel economy. You get much better control injecting directly into the cylinder then the intake manifold. If direct injection wasn't a benefit OEMs wouldn't spend the extra money to fit it.
Quote:
Originally Posted by cRiPpLe_rOoStEr
Sure for an OEM it's easier to fit a particulate filter than working around a car to make it dedicated-CNG, and even some newer CNG-capable models available in Europe nowadays might retain a particulate filter as they retain the ability to run on gasoline. But the cost of CNG tanks has not been so much of an issue rendering conversions unsuitable in third-world countries.
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I'm specifically talking about OEM solutions where companies have to follow the law or face huge fines.
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10-13-2021, 06:13 PM
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#236 (permalink)
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It's all about Diesel
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Quote:
Originally Posted by JSH
Direct injection is required for emissions, performance and fuel economy.
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Yet sometimes an "outdated" port-injection engine, even though not likely to outperform a counterpart fitted with direct injection, may actually result in a higher fuel economy and lower NOx emissions. Performance-wise, McLaren and Koenigsegg have been doing a great job with port-injection while most of the competition switched to direct injection.
Quote:
You get much better control injecting directly into the cylinder then the intake manifold.
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Direct injection has its advantages, yet port-injection remains cost-effective for some applications.
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If direct injection wasn't a benefit OEMs wouldn't spend the extra money to fit it.
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Had either that Freevalve system or something analogue been widespread, it would be the end of direct injection on gassers. And even for flexfuels, there are easily-implemented cold starting aids.
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09-13-2023, 02:13 PM
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#237 (permalink)
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Corporate imperialist
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
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09-13-2023, 03:38 PM
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#238 (permalink)
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Master EcoModder
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Excluded 2023 so they don't have to include Californica?
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