Gas engines - what makes them different from diesel and petrol?
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- Опубликовано: 27 май 2022
- What makes the difference between petrol, diesel, and gas fuelled engines? It's mainly down to the combustion characteristics of the fuels - gas burns hotter, and therefore requires more oxidation stability. It also requires unique storage solutions, which is why gas engines have seen most widespread adoption in power generation and gas compression applications, where gas is readily available. Small LPG-based cars are also becoming more popular, particularly among taxi fleets, and these operate on the same principle.
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Hi I’m Rafe Britton, the Lubrication Expert. I’m known within the industry for my RUclips channel and podcast, and I work with mid-size industrials improve their equipment uptime while reducing the cost of their lubrication program. I’m a mechanical engineer with 13 years of experience on both sides of the industry; both as an operator, and lubricant supplier. I hold a Bachelor of Aerospace Engineering and a Bachelor of Physics from UNSW.
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Industry doesn’t understand lubrication, and few people are left to teach them. This results in incorrect use of lubricants, contamination & machine failure, leaving reliability engineers frustrated with the state of their lubrication program. The ultimate consequence is more machine interventions, more waste, and more equipment downtime
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thanks for sharing. Interesting to note that engine lube oils designed for 'gas' engines tend to be more tolerant of the gas contaminants that could lead to poor TBN or corrosion.
Yeah, although some diesel engine oils do tend to have higher BN, particularly the marine engine oils.
Lean burn is more efficient.
Rich burn with 3 way catalyst can achieve lower overall emissions rates than a lean burn.
Both types have their advantages.
Please read EGSA power generation reference book chapter on large liquid cooled spark ignited engines.
it would be interesting to make a video about the characteristics of motorcycle lubricants, especially what the presence of the wet clutch entails and the jaso MA MA2 specifications.
I've had a couple of requests for this. It's on the list!
Thanks for the informative video
No worries!
Great video, Mr. LE! I wonder how much soot a 15w40 semusyn Diesel engine Lube can handle vs. a common semisyn 15w40 Gasoline Lube ?
Good question! Unfortunately I don't have a great answer at the moment. I ask around.
A lot more soot, since it has special additives due to diesel oils requiring them to dissolve and keep soot in suspension. That's not really an issue with gasoline oil.
@@em4703 gasoline exhaust is far more acidic & exh water is more prevalent.. do a hot vs cold oil change & see the resultant water in the oil especially cars that do a lot of short runs
Hey, I made a synthetic lubricant but want to make it thicker, right now its probably close to 140W but I want it closer to 240W. What should I add?
Also, this lubricant is used on pivots so temperature is not a concern. I am not very experienced with oil making, sorry about that.
Good question. That's a pretty big jump that you're looking for. What base oil did you use? You might need to start with a higher viscosity grade. You could use a bunch of PIBs to jack up the viscosity but I don't think that would be ideal...
Use grease...
Thanks Rafe, this is a very clear and understandable explanation. Really appreciated.
Thanks James!
however incorrect it fundamentally is.. the fuel ignition methods set significantly different design demands.. same applies to "2-stroke" comparisons.. as an example theres NO similarities between uniflow vs loop scavenged "2-strokes".. both 2-strokes!!.. nothing comparable.. homogenous charge compression ignition exemplifies the fundamental difference design demand.. applying diesel principles to "gas" fueled piston engines.. no mention of why diesel engine donut piston crown chambers.. thats a fundamental demand difference
Are you talking about CNG So natural gas or biogas
You can apparently convert a diesel engine so that it can run on gas
Per inferiori
You need to modify the title of this video with lpg/cng in parentheses. It is not plainly obvious for the first quarter of your video that you do not mean gasoline to the majority of the native English speaking world.
You mean Americans? Most English speaking countries use the term Petrol.
endless debate that lpg destroys engines...
i find it funny, gas flame is colder than gasoline. en.wikipedia.org/wiki/Adiabatic_flame_temperature
these guys measured exhaust temp, and lpg was colder by 20 deg c ruclips.net/video/Kzej3WzcvAM/видео.html
But I once read a study that shows it bruns hotter because It doesn't cool the valves like petrol does therefore LPG might (not destroy) cause valve recession
Yeah I don't think it's necessarily going to destroy an engine given there's plenty of perfectly functional has engines out there. But the combustion characteristics are definitely different. It's flame speed as well as temperature.