Home > Maintenance & Mods (L322) > Diesel virgin |
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Haylands Member Since: 04 Mar 2014 Location: East Yorkshire Posts: 8222 |
You've missed the point... I'm not saying for one second that using something will not wear it out, what I like to do is wear everything out in equal measure... I (and a lot of other people) find that using all aspects of the car to the parameters they were designed to work in keeps everything evenly worn and working nicely... If you don't agree, that is fine but please try not to be rude about other peoples beliefs, I post what I think, I don't tell anyone what to believe. I respect others views and beliefs and appreciate there are many different views and opinions... Pete __________________________________________________ 2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior 2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold 2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold 2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold -Click for Project Fatty off roader- |
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25th Aug 2022 9:15pm |
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garyRR Member Since: 13 Mar 2021 Location: Hampshire Posts: 1468 |
The key is to only work the engine once up to temperature, as straining an engine when cold and not up to it's full design tolerances through heat expansion can lead to premature damage/wear. I would argue it's not a wise idea to never engage the 2nd turbo because it needs heat and charged air in order to clear any accumulation of oil. Doing this daily or every few days will always keep it clear and ensure the amount of oil sent through the engine for burning is miniscule. Doing this once a year could send a lot of oil through the intake and into combustion at one time, prematurely damaging the cylinder(s) or exhaust components. On a diesel it's not as risky as on a petrol however. The other thing is that the occasional "foot down" ensures components get red hot and better able to burn out any coke build up. 2015 Range Rover Autobiography 4.4 SDV8 |
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26th Aug 2022 4:43am |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3227 |
Please accept my apologies if I came over as rude as this was not my intention at all. However I'm not convinced by the need to suddenly torque load my geartrain by engaging the 2nd turbo every trip on a 10yr old car approaching 150k miles. AFAIK the oil buildup in the 2nd turbo is on the exhaust side as when it 'blows' the smoke is white/ grey so it's not going through the engine intake and being burnt (it would be blue) and furthermore this turbo bypasses the DPF so it's not adding to ash build-up. Diesel generators are not like automotive engines as they are designed to run at steady loads and unless you are towing constantly or driving up a hill indefinitely or doing very high speed autobahn runs it's impossible to subject these engines to steady high loads and I suspect they will be designed around light load use. On Petrol engines heat generated by hard acceleration was/ is certainly a way of burning of carbon fouling on plugs and maybe exhaust valves but I'm not at all convinced this applies to modem diesel engines. Furthermore high power generation on diesel is achieved by increasing the fuel / air ratio so you are also increasing the likelihood of creating more not less soot and therefore more deposits. 2012 TDV8 Vogue (L322) |
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26th Aug 2022 7:28am |
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DrRob Member Since: 16 Apr 2015 Location: Petersfield, Hampshire Posts: 4302 |
Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
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26th Aug 2022 10:38am |
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kevinp Member Since: 28 Sep 2019 Location: Telford Posts: 1213 |
I don't understand how the second turbo dose not blow into the inlet manifold and does not go through the dpf. Surely everything goes through the dpf? |
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26th Aug 2022 11:06am |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3227 |
I was wrong and it just bypasses the CAT. The oil likley accumulates mainly on the exhaust side of the turbine and am only going on smoke colour - white grey is oil vapour from and blue is oil smoke from it being combusted in the cylinders. 2012 TDV8 Vogue (L322) |
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26th Aug 2022 11:25am |
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mjdronfield Member Since: 04 Nov 2011 Location: Derbyshire Posts: 7800 |
I just know it doesn’t smoke if I give it the odd blast… doesn’t have to be balls out…
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26th Aug 2022 12:50pm |
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Phoenix Member Since: 16 May 2022 Location: Gone Posts: 1631 |
You'd be surprised at how much load variation there is on generation sets, if it was all fixed load then they wouldn't need turbos. There is also an issue with transient phase imbalance causing instability which can do real physical damage. Anyway, back to keeping the second turbo active - just use your gears, nobody is saying you need to cane the life out of it just work it sufficiently to get the engine core temperature up and it will help not just the turbo but also burn off some of the carbon deposits.
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26th Aug 2022 1:50pm |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3227 |
Not sure I understand how to use the gears to get the engine 'core temperature' up as this must be governed by load not RPM and the combustion temperatures are also kept low by the EGR valve which is open most of the time. To get the 2nd turbo going you do actually have to cane it some. Just done 1800miles around the UK and Ireland on a mixture of roads and gradients and never went into the 2nd turbo. Max torque ( 700nm) is achieved at 1500rpm and there's plenty of poke for sensible overtaking manoeuvres under 2500rpm. Each to their own but I'll carry on as I have been doing 2012 TDV8 Vogue (L322) |
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26th Aug 2022 3:06pm |
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Haylands Member Since: 04 Mar 2014 Location: East Yorkshire Posts: 8222 |
It's a very "Marmite" subject, each to their own, just do whatever makes you feel right... Pete
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26th Aug 2022 5:10pm |
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ergobyte Member Since: 03 Apr 2022 Location: bordeaux Posts: 124 |
Ok, I'll google what the heck is "Marmite" ... "it needs some intelligence to undestand you may not have enough" |
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27th Aug 2022 7:48am |
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Kot Member Since: 10 Mar 2021 Location: broadland Posts: 1205 |
Marmite--- You either Love it or Hate it 2018 SE SDV8 4.4 Byron Blue |
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27th Aug 2022 8:13am |
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Kot Member Since: 10 Mar 2021 Location: broadland Posts: 1205 |
Normal driving after 15 to 20 mins even at revs around 1500, your oil temperature will be around the 95 to 100C temperature anyway, that is a good time to test your 2nd Turbo with a clear road ahead. Just dont ever take the revs anywhere near the red zone, its there for a reason. 2018 SE SDV8 4.4 Byron Blue |
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27th Aug 2022 8:21am |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3227 |
Don’t use the 2nd turbo so no need to clear it . If I did ever need it then it would clear itself (sorry in advance to anyone who is behind me……)
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27th Aug 2022 9:28am |
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