The Most Efficient Engine I've ever made. 55.1%. EDIT: 58.2%!

[Motakai]

https://imgur.com/a/rnb8KDX (The newest one: https://imgur.com/a/Lk2Ry5H)

Anyone wanna try and one up me? I'm stumped on how to get this any higher...
FYI It will get 2L/100kms (100mpg) if you put it in most cars!

[Arya]

As impressive as that is, being a V12 you're going to struggle to apply that in "real-world" conditions. After all, most mainstream cars can't mount a V12. And it's extremely expensive.

[CBR JGWRR]

Wolfey, you are thinking of the wrong application - as a concept for an articulated truck engine that is fantastic, as if such an engine existed in the real world it would obsolete the use of diesel engines on fuel economy, because that engine could save best part of £50,000 per year per truck in reduced fuel costs while having acceptable servicing costs for long distance haulage applications. Ok, with the immense ET/PU costs it is non-viable, and the reliability is too low, as is power compared with modern trucks where 400 bhp is entry level these days, but as a tech study the concept is very worthwhile.

[Arya]

Originally posted by CBR JGWRR:

Wolfey, you are thinking of the wrong application - as a concept for an articulated truck engine that is fantastic, as if such an engine existed in the real world it would obsolete the use of diesel engines on fuel economy, because that engine could save best part of £50,000 per year per truck in reduced fuel costs while having acceptable servicing costs for long distance haulage applications. Ok, with the immense ET/PU costs it is non-viable, and the reliability is too low, as is power compared with modern trucks where 400 bhp is entry level these days, but as a tech study the concept is very worthwhile.

Oohh... I see. Thank you.

That's amazing - my sincere apologies OP. I spoke in ignorance.

[CBR JGWRR]

On actually doing the maths, £50k per truck per year is pushing it; the figure is potentially doable between improved practices and much higher miles travelled depending on what engines are being upgraded from, but it definitely gives the wrong impression.

Expressing in a much more representative way, I work at a small haulage company, 18 trucks (ish, it's varying at the moment as the older trucks are being replaced) each truck averaging 300 miles per day, 500 if they are double shifted. Fleet average mpg at this time of year is 11 mpg; the brand new trucks are 11-12 mpg, the older (and slightly more numerous) trucks are 10-11 mpg. Each extra mpg is worth at least £10,000 over the course of a year, per truck; those are around 45% thermally efficient. (pretty much 170-190 thousand gallons of diesel per truck per year)

Working the numbers through properly for our situation, the savings that OP's engine could offer equate to between £10-20k per year per truck for us with the jobs we do, however, we are already one of the most focused companies on fuel economy (we have a fuel bonus scheme, all our drivers are trained by Scania, the main truck supplier, in how to get the very best out of the trucks, half our drivers rank amongst the very best in the country, and a few more bits I'm not allowed to disclose) so we wouldn't benefit as much as some could do.

[Prasiatko]

Since judging by the engineering time we have no limits on sliders i give you:
This , 61.3% efficiency. In a car it does 1.69 l/100 km or 139 MPG.

Unfortunately it takes ~50 years to engineer and 740 man hours of labour on top of the $15k material costs resulting in a car that costs about half a million with the most basic trim.

[CBR JGWRR]

If you want something more normal road car ready: https://steamcommunity.com/sharedfiles/filedetails/?id=1712672232

2012 year, all qualities on 0.

It is worth noting that in the real world, new car engines are expected to be at least 30%, with some diesel car engines (which automation can't do) approaching 40% area.

[RiftHunter4]

On the inline-4, how did you get such a torque-heavy curve?

[CBR JGWRR]

Originally posted by RiftHunter4:

On the inline-4, how did you get such a torque-heavy curve?

It's turbocharged; specifically, a small, low boost turbocharger.

You'll also note that unlike the engine OP posted, where the rev limiter was put at 2000 rpm, mine is up to 6000 rpm, which shows the full range; the actual rpm where the turbo is operating correctly is in the same region on all three engines posted so far. (you can see the decline in OP's curve, but the limiter masks it)

[RiftHunter4]

Originally posted by CBR JGWRR:

Originally posted by RiftHunter4:

On the inline-4, how did you get such a torque-heavy curve?

It's turbocharged; specifically, a small, low boost turbocharger.

You'll also note that unlike the engine OP posted, where the rev limiter was put at 2000 rpm, mine is up to 6000 rpm, which shows the full range; the actual rpm where the turbo is operating correctly is in the same region on all three engines posted so far. (you can see the decline in OP's curve, but the limiter masks it)

Interesting. All of my Turbo engines less torque but high horsepower.

[CBR JGWRR]

Originally posted by RiftHunter4:

Interesting. All of my Turbo engines less torque but high horsepower.

That's not how this works. Power is a function of torque and rpm; turbos work by forcing more air into the combustion chamber which is then combusted. In effect, it is like making the engine bigger.

What's happening is your turbos are operating at higher rpm bands than these three engines are, and the peaks are correlating in a way that makes more visible difference on the graph, which creates the impression that you are creating less torque while making more power.

[Arya]

Originally posted by RiftHunter4:

On the inline-4, how did you get such a torque-heavy curve?

An undersquare R4 with a small, low-pressure turbo and a very conversative cam profile can have a fantastic torque delivery. Most of my road cars reach peak torque between 1800 and 2200 RPM.

Turbos are most efficient between .450 and .75 BAR depending on the size of the engine. R-Engines benefit from a large turbine and a small turbine; it looks slightly odd at first glance but there are massive efficiency gains there, especially on larger displacement engines. My biggest mainstream engine is a 2.2 litre heavily undersquare R5. And it uses a huge 47.5mm compressor, and runs at .7 BAR of boost. Achieving 40% efficiency. Which I'm not totally happy with; I'm hoping for 42-45% eventually.

[RiftHunter4]

Originally posted by Wolfey:

Originally posted by RiftHunter4:

On the inline-4, how did you get such a torque-heavy curve?

An undersquare R4 with a small, low-pressure turbo and a very conversative cam profile can have a fantastic torque delivery. Most of my road cars reach peak torque between 1800 and 2200 RPM.

Turbos are most efficient between .450 and .75 BAR depending on the size of the engine. R-Engines benefit from a large turbine and a small turbine; it looks slightly odd at first glance but there are massive efficiency gains there, especially on larger displacement engines. My biggest mainstream engine is a 2.2 litre heavily undersquare R5. And it uses a huge 47.5mm compressor, and runs at .7 BAR of boost. Achieving 40% efficiency. Which I'm not totally happy with; I'm hoping for 42-45% eventually.

Nice. I've been trying to make a Ford Ecoboost engine for a while now with no luck.

[Motakai]

Originally posted by Prasiatko:

Since judging by the engineering time we have no limits on sliders i give you:
This , 61.3% efficiency. In a car it does 1.69 l/100 km or 139 MPG.

Unfortunately it takes ~50 years to engineer and 740 man hours of labour on top of the $15k material costs resulting in a car that costs about half a million with the most basic trim.

Regarding that 61.3% efficiency engine, I've done everything I know of to achieve that engine, and could not, perhaps it was made on an older update?
EDIT: I have tried to emulate it's stats in every way, and It is certainly not achievable in the current version of automation. EDIT 2, This is the closest I can get in regards to raw efficiency, I do not know if another setup would be better, but this is what I've come up with. https://imgur.com/a/Lk2Ry5H