A shameless image thread for the enginephiles

All that has to do with the power train, gearbox, clutch, fuels and lubricants, etc. Generally the mechanical side of Formula One.
roon
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Re: A shameless image thread for the enginephiles

Post by roon » Sat Nov 25, 2017 8:40 pm

VC-Turbo - the world's first production-ready variable compression ratio engine

The VC-Turbo engine is the world's first production-ready variable compression ratio engine, transforming on demand. A breakthrough in combustion engine design, the 2.0-liter VC-Turbo engine adjusts its compression ratio to optimize power and efficiency. It combines the power of a 2.0-liter turbocharged gasoline engine with the torque and efficiency of a four-cylinder diesel engine. A compelling alternative to diesel, it challenges the notion that only hybrid and diesel powertrains can deliver high torque and efficiency.

The VC-Turbo offers any compression ratio between 8:1 (for performance) and 14:1 (for efficiency). The engine delivers 268 hp (200 kW) and 280 lb ft (380 Nm), an expected best-in-class combination of four-cylinder power and torque. Front-wheel-drive models offer a 35% improvement in fuel efficiency over the previous V6 gasoline QX50; all-wheel-drive models offer a 30% improvement.
Cool to see this going into production. They say they've been working on it since '96. The mechanism was invented in '98.

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*Note oil jet in image above.

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e36jon
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Re: A shameless image thread for the enginephiles

Post by e36jon » Sun Nov 26, 2017 7:53 pm

I seem to remember Saab also having had a variable compression ratio engine. A quick Google verified my memory for once. Looks like Saab moved the head / combustion chamber:

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Apparently it never went to production (Circa ~2000) due to costs. Images are from Saab.

roon
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Re: A shameless image thread for the enginephiles

Post by roon » Sun Nov 26, 2017 9:06 pm

I remember it as well. Someone or some legal entity might be sitting on the patent for it, or it truly wasn't a cost effective approach, as you say. The advantage of the Infiniti design is that it keeps the block and head as a rigid unit, unchanged from a traditional engine assembly. The key developments were to the crankshaft assembly. The SAAB passes compression and combustion loads through the mechanism, and requires a big rubber gasket to seal the crankcase.

Manoah2u
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Re: A shameless image thread for the enginephiles

Post by Manoah2u » Tue Nov 28, 2017 9:53 am

performance figures are imho worthless if not also shown with real-life efficiency applications (and then performance, too).

Let's say a current SUV does on 1 litres of gasoline about 15 kilometers. 30% more efficiency then ups it to about 1:20.
offcourse that's a lot better, BUT is that the actual daily use figure? and what's the cost for having this engine in your desired infinity car?

don't get me wrong, i like these technological 'advances' - even if i wonder whether you can call a 20 year old design anything like technological advancement.

wouldn't a hybrid be far more efficient anyway?
Dumpster sounds so much more classy. It's the diamond of the cesspools.

J.A.W.
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Re: A shameless image thread for the enginephiles

Post by J.A.W. » Fri Dec 01, 2017 9:47 am

Yeah, I note that mention of RPM is absent..

With all that extra mass to whirl about, its not gonna be a sporty unit..
So, maybe as analog/replacement for diesel, facing a pending ban for particulate emissions?
Dr Zachary Smith sez..
"Yes.. spare us your ridiculous remarks, you insensitive idiot!"

Tommy Cookers
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Re: A shameless image thread for the enginephiles

Post by Tommy Cookers » Fri Dec 01, 2017 11:35 pm

can't find a picture of the 1980 Yamaha 001A 500cc GP V4

28 valves 70 bore x 32.4 stroke and 123 bhp at 18000 rpm

roon
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Re: A shameless image thread for the enginephiles

Post by roon » Sat Dec 02, 2017 12:53 am

Tommy Cookers wrote:
Fri Dec 01, 2017 11:35 pm
can't find a picture of the 1980 Yamaha 001A 500cc GP V4

28 valves 70 bore x 32.4 stroke and 123 bhp at 18000 rpm
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roon
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Re: A shameless image thread for the enginephiles

Post by roon » Sat Dec 02, 2017 11:53 pm

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roon
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Re: A shameless image thread for the enginephiles

Post by roon » Sun Dec 03, 2017 12:33 am

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roon
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Re: A shameless image thread for the enginephiles

Post by roon » Wed Dec 06, 2017 2:09 am

J.A.W. wrote:
Fri Dec 01, 2017 9:47 am
Yeah, I note that mention of RPM is absent..

With all that extra mass to whirl about, its not gonna be a sporty unit..
So, maybe as analog/replacement for diesel, facing a pending ban for particulate emissions?
Yeah, they themselves compare it to a diesel engine. Interestingly, it's being paired to a CVT exclusively for this its first MY. So the CVT has no prob with the extra low RPM torque apparently. Diesel torque + CVT seems to be a rare combination in the auto world. I don't know of any other examples.

Maybe the CVT is gentler on the engine, and they'll pair it with autos or manuals in time, as the technology is validated in the real world.

rkn
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Re: A shameless image thread for the enginephiles

Post by rkn » Wed Dec 06, 2017 9:27 pm

It just won't ever be the same.


roon
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Re: A shameless image thread for the enginephiles

Post by roon » Sat Dec 16, 2017 9:22 pm

Mecachrome LMP1 hot-vee-6 turbo in development.

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bill shoe
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Re: A shameless image thread for the enginephiles

Post by bill shoe » Sun Dec 17, 2017 12:42 am

roon wrote:
Sat Dec 02, 2017 12:53 am
Tommy Cookers wrote:
Fri Dec 01, 2017 11:35 pm
can't find a picture of the 1980 Yamaha 001A 500cc GP V4

28 valves 70 bore x 32.4 stroke and 123 bhp at 18000 rpm
Since we're pondering engines with more than 4 valves/cyl, here's the 8 valve/cyl Honda oval-piston engine. Yes, it's kind of a cheater for purposes of this discussion because each combustion chamber is a pair of 4 valve/cyl combustion chambers siamesed together. But these devious methods are precisely why this engine is so epic.

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r101
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Re: A shameless image thread for the enginephiles

Post by r101 » Sun Dec 17, 2017 2:07 am

Since we're pondering engines with more than 4 valves/cyl, here's the 8 valve/cyl Honda oval-piston engine. Yes, it's kind of a cheater for purposes of this discussion because each combustion chamber is a pair of 4 valve/cyl combustion chambers siamesed together. But these devious methods are precisely why this engine is so epic.
I remember this! It was on NR750 and 125 HP from that displacement was kinda big deal in 1992.

roon
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Re: A shameless image thread for the enginephiles

Post by roon » Mon Dec 18, 2017 12:00 am

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bill shoe wrote:
Sun Dec 17, 2017 12:42 am
roon wrote:
Sat Dec 02, 2017 12:53 am
Tommy Cookers wrote:
Fri Dec 01, 2017 11:35 pm
can't find a picture of the 1980 Yamaha 001A 500cc GP V4

28 valves 70 bore x 32.4 stroke and 123 bhp at 18000 rpm
Since we're pondering engines with more than 4 valves/cyl, here's the 8 valve/cyl Honda oval-piston engine. Yes, it's kind of a cheater for purposes of this discussion because each combustion chamber is a pair of 4 valve/cyl combustion chambers siamesed together. But these devious methods are precisely why this engine is so epic.

https://motovue.files.wordpress.com/201 ... 21zyo1.jpg
Why stop at two? Get a straight six, do this... world's longest twenty-four valve single cylinder.