Why don't people do this or at least even try it?Convert a 4 stroke to operate as a 2 stroke while retaining the benefits of a pressurized oil system. All you would need to do is put forced induction on the intake like a supercharger and then change the timing so that both intake and exhaust valves are open at BDC, with the exhaust opening slightly earlier. The chamber depressurizes as soon as the exhaust valve opens, then the supercharger blows out the old air when the intake opens and then both valves close for the compression and firing.Even if you don't get all the exhaust out and the fresh air charge is less than a 4 stroke, you can still double the number of firings so anything above a 50% charge from the 4 stroke cycle will give you a power increase. If cooling is an issue then use water injection. And fuel consumption won't be an issue with modern direct injection engines.I understand mazda patented this recently, but it shouldn't have taken this long for people to come up with this idea or try it as a mod for their personal vehicles. It might be difficult with VVT systems, but there's no reason why you couldn't put smaller cam sprockets on motorcycle engines so that the cams runs 1:1 with the crankshaft and allow for 2 cycle firing. Imagine a 1L engine putting out like 300hp without any real boost, the supercharger would be sized just enough to clear out the chamber.
>>28979296so a rotary
>>28979299Rotaries have oil mixed fuel like a normal 2 stroke, the opposite of a rotary. This is a normal 4 stroke engine that has a crank case full of oil so that it can last forever, but it fires twice as much.
>>28979304Mazda's rotaries inject oil separately from the fuel and fire 3 times as often per eccentric shaft rotation as a piston 4 stroke engine does.
>>28979320And they still blow seals and burn oil which is why they can't make them as real engines. This is way more realistic as a normal running engine which needs no extra precautions or maintenance.
>>28979328You're complaining about burning oil while asking for a 2 smoke?
>>28979332Why are you doing this? Trolling rather than actually coming up with an argument?
>>28979296it needs a complete change of cam and timing. only diesel actually benefit from running on two stroke.
>>28979336Where's the trolling? You turned down my rotary suggestion for a reason that is one of the defining characteristics of the 2 strokes you're asking for.
>>28979341People make custom camshafts all the time. But I figure you don't even need custom ones, you just need adjustable shafts which let you put new sprockets on or just grind away the existing sprockets and weld on new smaller ones.One argument you could make is that the cam shafts are now rotating twice as fast which could cause problems with valve float and you'll have to reduce the max engine RPM, but the valves will only be open at BDC so they should have the time to close properly and if they don't then I don't think you'll have to cut RPM by much.
if 4-strokes are suck squeeze bang blow, and 2-strokes are bang-blow, why can't we make a 1-stroke engine that's just constantly banging
>>28979369They're called gas turbines.
>>28979296>so anything above a 50% charge from the 4 stroke cycle will give you a power increaseThays not how it works.
>>28979408Power is literally energy output divided by time. If you double the power cycles over the same time but cut the energy per cycle by 50% then the power out stays the same. If you get more than 50% of the power out per cycle then the power out goes up. Two stroke engines have a much higher power output per litre than 4 strokes, ask an AI.
>>28979418>ask an AIThat fact that you think an LLM is an authoritative source on anything destroyed any and all credibility you may have had.Nigger it's like Wikipedia if Wikipedia made shit up and said whatever it thought would keep you around for longer.
>>28979460It was meant for a luddite that can't work out that more energy/time = more power. The kind of person that would believe the AI.Do you have any actual engineering/science based argument against my idea?
>>28979467Calm down pal, I'm not that other guy and I didn't say anything about your idea. I just think appealing to AI is a clear sign that someone is retarded. Like mega-retarded.
>>28979475People are already starting to defer to AI. 80% of the population are retarded, there will come a time when you will have to tell most people 'ask an AI' instead of 'google it'.Acutally considering your knee jerk redditite reaction instead of actual consideration of what was being said, you might be one of the retarded 80%.
>>28979296Garage 54 did it: https://www.youtube.com/watch?v=XQf5jMagzrkTLDW: They got it running, but not well. More tuning and development is needed.
With modern tech they can probably make a deisel style 2 stroke work with gasoline. Also Mazda was supposedly working on and engine exactly how you described but I haven't seen or heard anything about it in a long time. Must not be as good as they thought. Anyways, why can't someone like mercury make a 2 stroke crate engine for cars? Do crate engines still adhere to emission laws and such?
>>28979418Having a "half charge" in a cylinder wont do jack fucking shit bevause youre dealing with air-fuel ratio and compression ratio.
>>28979505Oh, excuse me. I see how it is.>Be retard>Appeal to AI>get called on it>"N-no I was just pretending to be retard to appeal to the layman bro, trust me I'm smart. In fact - no ur retarded."
>>28979531They half did it, they shouldn't have deleted the exhaust valves and they should've ran the supercharger off the crank shaft properly. I think this can actually work if some one puts time into doing it right.
>>28979296Theory faggot you have never touched a wrench in your life. Stick to the eBay h2 generators and electric superchargers fucking ricer. Funny post tho btw kek even
>>28979536The laws are usually written in a way that say 'a car for sale', i.e. manufacturers can't sell cars like that but nothing stops people from doing whatever they want afterwards. The inherent problem with 2 stroke is not having a pressurized oil system, they just don't last and they stink because of burning oil and they need ridiculous exhausts to function. A valved forced induction 2 stroke would solve all of those problems
>>28979716>2 stroke is not having a pressurized oil systemMost have an oil injection pump for auto mixing>they just don't lastThey can but not if you want performance which is always the trade off.>they stink because of burning oilCastor 927.>ridiculous exhaustsThose expansion chambers are what add a type of beauty to the engines, though.
>>28979907>Most have an oil injection pump for auto mixingHaving traces of oil mixed into atomized fuel and then relying on that for lubrication is not comparable to a 4 stroke that is literally sitting in a bath of oil.Modern 4 strokes have become too good for people to accept any sort of compromise that seems archaic in exchange for more power. The 2 stroke must operate like a 4 stroke if it's going to live on.
>>28979930I see what you are saying. Diesel 2 strokes have a pressurized oil system. I think the issue would be fitting a spark plug and fuel injector in the same spot, though.Either way, I still wish mercury could come out with a 2 stroke crate engine. Even if it is a little inline 4.
>>28979296Not practical,Why we didn't see blower scavenged petrol two strokes beats me.
>>28979296Big ship diesel engines work like this but without valves. There are holes in the cylinder wall that are released by the piston when in the lower position and a charger blowers air through them. The outlet closes a little time before the inlet so that pressure builds up.One of the big advantages of a 2 stroke is that it doesn't need valves and a camshaft...
>>28979930>Modern 4 strokes have become too good for people to accept any sort of compromisThis.Also emission standards.To make a viable 2-stroke engine except for very small or very big engines, the technical complexity will go through the roof, which obliterates one of the main reasons for 2-strokes in the first place - that they're simpler and cheaper.
>>28979983That can't work with an oil system because the piston rings would leak oil out as the piston passed the ports and that burning oil would never pass emissions in a car.
>>28979418>when you double the cycles but half your fuel and air charge is mixed with exhaust gas so you make less power Based retard
>>28979989>he doesn't know about EGR
>>28979995Literally the purpose of EGR is to add an inert gas into the cylinder which DOESN'T ADD MORE POWER (or make it lean, like pure air would) so that you can cruise at light throttle without all the pumping losses of throttling the engine right down.You are retarded.
>>28979997No.It's an emissions thing.The inert gas (CO2) reduces the combustion temperature and this also reduces the production of NOx.A diesel engine runs fine on clean air and higher combustion temperature also usually means greater efficiency.
>>28979998>The inert gas (CO2) reduces the combustion temperatureCompared to what retard?(Compared to adding extra air and making it lean)You lack the intelligence to discuss any of this.
>>28979997>>28980001So a 2 stroke conversion comes with EGR built in, albeit at a higher temperature since you don't have time to cool the gas, but the other guys comment that you would make less power than a 4 stroke is wrong since the 4 stroke also fills it's chamber with exhaust gas.
>>28980005EGR only kicks in for light throttle you absolute gigaretard
>>28980001You're the idiot here, stupid ass and also aggressive like a nigger.Even the nomenclature "lean" is useless in the context of diesel engines.The main point of the diesel engine is to aspire (not with a turbo, obviously) the same volume of air in every cycle (regardless of load) and inject the necessary amount of fuel around the point of maximum compression. So there is no lean mixture in a diesel engine.While a gasoline engine needs a lambda value around 1 to run, a diesel engine always burns fuel with "too much" air.And the reason for EGR valves I have already described correctly.
>>28980010Why are you now pretending this discussion is exclusively about diesel engines?
I mean, you could only do this if you moved the ports to the side.. and then you'd have what already exists a fucking 2 stroke.
>>28979418Nah, I mean yeah in a perfect world, but not in the real world. In the real world because of the design constraints of a 2 stroke they make less power than a modern equivalent cc 4 stroke and this gets worse the higher the displacement. The uniflow somewhat solves this, but at the cost of efficiency and with the necessity of forced induction.
>>28979369>why can't we make a 1-stroke engine that's just constantly bangingThere is and it's named after your mom
>>28979987Well, those engines burn bunker C oil, which is almost tar, so emissions are probably not too good anyway.I don't know exactly how lubrication works there, but as far as I know the oil that is filled at commissioning stays in the engine until it's scrapped along with the ship around it.
>>28979296>while retaining the benefits of a pressurized oil system.>put forced induction on the intake like a superchargerAlready been done. These were a mainstay of commercial diesels for many years.Here is one doing 0 - 2MW in 4 secondshttps://www.youtube.com/watch?v=Zn9K2giMTpoBut they had some issues with emissions.https://www.youtube.com/shorts/VU8KFmuaZBMThat 2 stroke soundhttps://www.youtube.com/watch?v=iU3gZGUInd4One from the UKhttps://www.youtube.com/watch?v=5pwhm_xoDiYOr for something from recent timeshttps://www.youtube.com/watch?v=Mfy05zqn324And if you want over 100,000hphttps://www.youtube.com/shorts/IEDqUVHlO7U
>>28979296Look at large marine diesel 2 strokes. They essentially work like how you describe.Apparently GM did try it out in cars. Cant remember when.
Why 2 strokes when you could have single stroke?https://www.thedrive.com/news/company-builds-powerful-500cc-one-stroke-engine-immediately-installs-it-in-a-miata
