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Arlo



Member Since: 05 Jul 2020
Location: Sterksel
Posts: 12

Netherlands 
2 stroke oil adding in dieseltank 2.2 Puma
Hi, I have been reading a bit about adding 200cc 2stroke oil to a full tank of diesel, which helps to prevent problems with the injectors. I am not sure about this, doesn't it effect the DPF? And how about the smoke? Does it really works? Like to hear your experience Thumbs Up
Regards, Arlo
Post #872326 10th Dec 2020 5:24pm
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Huttopia



Member Since: 23 Feb 2016
Location: West Midlands
Posts: 1972

United Kingdom 
Hi- search is your friend, this topic has been done to death, dug up and done again, and again....
Post #872331 10th Dec 2020 6:12pm
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Arlo



Member Since: 05 Jul 2020
Location: Sterksel
Posts: 12

Netherlands 
Embarassed I will use the search, thanks!
Post #872333 10th Dec 2020 6:32pm
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Huttopia



Member Since: 23 Feb 2016
Location: West Midlands
Posts: 1972

United Kingdom 
👍nice one
Post #872337 10th Dec 2020 6:39pm
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MartinK



Member Since: 02 Mar 2011
Location: Silverdale (Lancashire/Cumbria Border)
Posts: 2665

United Kingdom 2011 Defender 110 Puma 2.4 USW Orkney Grey
Fill your boots Smile
https://www.defender2.net/forum/topic1708.html?highlight=2so

I do use it, some don't, some swear by it, others say it's snake oil... Defender "Puma" 2.4 110 County Utility (possibly the last of the 2.4's)
Post #872404 11th Dec 2020 11:21am
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Julie



Member Since: 07 Oct 2017
Location: Nantes
Posts: 462

France 2012 Defender 110 Puma 2.2 SW Keswick Green
Re: 2 stroke oil adding in dieseltank 2.2 Puma
Arlo wrote:
Hi, I have been reading a bit about adding 200cc 2stroke oil to a full tank of diesel, which helps to prevent problems with the injectors. I am not sure about this, doesn't it effect the DPF? And how about the smoke? Does it really works? Like to hear your experience Thumbs Up
Regards, Arlo


Hope this helps Shocked

https://www.fuelexpert.co.za/2-stroke-oil-...-study.php

However I like 2 stroke oil in my Vespa Thumbs Up
Post #872622 12th Dec 2020 5:48pm
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Arlo



Member Since: 05 Jul 2020
Location: Sterksel
Posts: 12

Netherlands 
Thanks for the artikel. Especially the DPF-life is not clear, so better to buy quality fuel like Shell, Total.
Post #872740 13th Dec 2020 3:15pm
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Julie



Member Since: 07 Oct 2017
Location: Nantes
Posts: 462

France 2012 Defender 110 Puma 2.2 SW Keswick Green
if you prefer clean fuel - without water / petrol dilution - yes - branded fuel will be a good choice. Laughing
Post #872742 13th Dec 2020 3:24pm
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wynn153



Member Since: 30 Nov 2020
Location: Cheshire
Posts: 31

United Kingdom 
Adding 2 stroke oil to a petrol makes the exhaust smoky so would it have the same affect on a diesel, therefore clogging the DPF?

I'm no specialist but that's just my thoughts.
Post #873636 18th Dec 2020 6:26pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3399

Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
Petrol and diesel engines work somewhat differently.
In a petrol engine, there are sudden explosions, while diesel is a slow burn. Most probably in a diesel there is enough time for the oil to burn with the diesel.
As with anything, there is varying quality of 2 stroke oil. There are 2 stroke oils that build up a lot if carbon also in 2 stroke engines, while others keep a very clean engine. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #873661 18th Dec 2020 8:09pm
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mwestcrew



Member Since: 09 Dec 2019
Location: South Warwickshire
Posts: 245

United Kingdom 2011 Defender 130 Puma 2.4 HCPU Baltic Blue
I think you will find it is the other way round. In a petrol engine the spark ignites the compressed fuel and the combustion spreads progressively through the cylinder. (propagated flame front) whereas a Diesel engine has instantaneous ‘explosions’ caused by the compression.

At least that is my understanding.

As for smoke as a result of using 200ml of 2 stroke per full tank, this would be minimal. Most 2 stroke engines (that do smoke) require a mix of in the region of 20-100:1. 200ml in 50 litres is around 250:1 2011 130 Utility Body
2005 110 Van
Post #873694 18th Dec 2020 11:55pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17312

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Dinnu is right, in a diesel engine (or arguably a Stuart-Binney engine, but that is a different story*) the flame front is progressive as the fuel is injected in an atomised state into the hot compressed air in the cylinder, and it is the heat caused by the compression of the air that ignites the atomised fuel. The development and progression of the flame front is one of the most complex aspects of the Stuart-Binney/Diesel engine, and over the years there have been many forms, including separate combustion chambers. On of the key components to effective and total combustion is the provision of adequate "swirl" within the cylinder, and this has led over the years to some imaginative and complex piston and cylinder head designs.

In a spark ignition engine, an explosive pre-mixed fuel/air mixture is ignited. Again there is a flame front, but the flame progression tends to be faster (although I believe it is still technically a deflagration rather than a detonation).

What actually happens in the cylinder is actually rather interesting!

* The modern compression-ignition engine was arguably invented by Herbert Akroyd Stuart (and patented by Stuart and Charles Richard Binney for Hornsby and Sons of Grantham) in 1890, some seven years before Rudolf Diesel built his first working engine.
Post #873705 19th Dec 2020 12:59am
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3399

Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
To add to Blackwolf...
Petrol engine uses the Otto cycle. In thermodynamics, it is also called constant volume because the explosion happens so rapidly the cycle creates a sudden increase in pressure, while volume is not changing.
In a diesel engine, the cycle is called constant pressure. That means the pressure is constant while the volume is increasing (power stroke).
That means diesel is combusting practically as it is leaving the injector for the duration of the injection.
This is the main reason why you never hear about pinking in a diesel, and one of the reasons why diesel engines can make incredible milage.

Back to the original subject, the sudden explosion in a petrol engine cools rapidly again, and might not give enough time for the oil to burn. Oil, and diesel are slow burning fuels, reason to why diesels cannot generate high rpm. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #873717 19th Dec 2020 6:28am
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