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Particulate Filters - petrol and dieselViews : 908 Replies : 11Users Viewing This Thread : |
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Jul 15th, 2018, 13:08 | #1 |
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Particulate Filters - petrol and diesel
I understand that new petrol engined cars now have an exhaust particulate filter. Why is this necessary since I didn't think they produced carbon particles to anywhere near the same extent. Are the filters therefore similar to the ones which have been fitted to diesel cars for some time and subject to the same problems with re-generation and clogging?
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Jul 15th, 2018, 14:40 | #2 |
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Honest John in the Telegraph yesterday said the petrol filters were self cleaning and no problem compared to DPF's which need a good high rev run to burn them clean. Having said that my last 4 cars have had DPF's without problem, although I've kept none of them for more than 3 years.
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Jul 15th, 2018, 15:05 | #3 | |
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Jul 15th, 2018, 15:06 | #4 |
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Direct injection petrol engines do indeed produce enough soot to come into the same regulations as Diesel engines.
Personally I run four diesel cars concurrently and have never had a DPF issue. PPF [petrol particulate filters] should be basically the same as DPF and should have even less of an issue. This is because petrol engine exhaust generally have far hotter exhaust to instigate a successful burn of the residual captured soot.
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Jul 15th, 2018, 15:11 | #5 | |
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Car will not regenerate unless it needs to though, even if driving conditions are ideal
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Jul 15th, 2018, 15:35 | #6 |
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Like Quacker, my D5 has never had a DPF issue in the 7 odd years I’ve had it. I’ve never even noticed it regenerating, even though I do a lot of short journeys.
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Jul 15th, 2018, 18:54 | #7 |
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Yes that's what I meant - sorry for the imprecision. Never had any problem with them because my driving pattern fits that. Only really bothers cars who drive local short distances without the 20 minute 50mph spin.
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Jul 15th, 2018, 18:55 | #8 | |
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Jul 15th, 2018, 21:05 | #9 |
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That's high for a farm tractor or truck but not high for a light duty high speed diesel car engine.
Almost all four cylinder engines have a lower limit operating range under load set at about 1500rpm. Petrol of diesel, it doesn't matter. Any lower than that under near full load and they become unstable in operation and operating stresses on the crankshaft increase exponentially. Which is why many operating manuals suggest not driving under load at less than 1500. Why any manual gear change indicator will advise to down change at those revs and why automatics invariable do down change at those revs when there is any load on the engine. So limiting yourself to only 1000 rpm operating range is very restrictive unless you like gear changing in a manual and drive like a 90 year old with cataracts, a blue rinse or flat cap. 1500 to 2500 is, however, usually the optimum rev range for maximum fuel efficiency and with diesels, coincides with the area where maximum torque is generated. That is also increasingly the case with modern turbocharged direct injection petrol engines.
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Jul 15th, 2018, 21:45 | #10 | |
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