Homogeneous Charge Compression Ignition

[CamaroSpike23]

on a basic level, its compression ignition (no spark plug) for gasoline engines.

discuss

[LostInMoscow]

It gives me the impression that it's going to have a lot of the same bad performance characteristics that a diesel engine has. Let's hope not!

[CamaroSpike23]

Originally Posted by LostInMoscow

It gives me the impression that it's going to have a lot of the same bad performance characteristics that a diesel engine has. Let's hope not!

such as?

[Kyle2k]

Originally Posted by CamaroSpike23

such as?

Maybe some lack of top end power?

[CamaroSpike23]

Originally Posted by Kyle2k

Maybe some lack of top end power?

thats mainly only for larger diesel truck engines that make OMGWTFBBQ power down low and have heavy rotating assy's that are better suited for low RPM power vs smaller diesels that make their power higher in the powerband.

[DGthe3]

Originally Posted by LostInMoscow

It gives me the impression that it's going to have a lot of the same bad performance characteristics that a diesel engine has. Let's hope not!

you mean like this car:



When the R10 TDI was introduced, it simply dominated Le Mans racing

[8cd03gro]

This is so old. . .

[DGthe3]

Anyway, I'm thinking this sort of engine (at least early on) will be perfect for series hybrid cars like the Volt. Currently the prototypes only have a limited RPM range that they can opperate in, but thats fine if you've got a Volt. As engineers learn to expand the envelope, it could be adopted in parallel hybrids then regular cars & trucks

[8cd03gro]

Originally Posted by DGthe3

Anyway, I'm thinking this sort of engine (at least early on) will be perfect for series hybrid cars like the Volt. Currently the prototypes only have a limited RPM range that they can opperate in, but thats fine if you've got a Volt. As engineers learn to expand the envelope, it could be adopted in parallel hybrids then regular cars & trucks

How would something like this counter knock from say, a bad batch of gas? Maybe richen up the AFR? Seems like a prime candidate for some cracked ringlands

[Mr. Wyndham]

HCCI is old.

Okay, not really. Last I read about it, the biggest issues they needed to overcome for production was NVH, top-end performance (above speeds of 55mph required the spark again to work), and calibration. This technology takes the complexity of DI to a WHOLE new level.

Seems pretty cool on the surface. I look forward to watching how it develops.

Great video, btw, Spike!

[CamaroSpike23]

Originally Posted by 8cd03gro

How would something like this counter knock from say, a bad batch of gas? Maybe richen up the AFR? Seems like a prime candidate for some cracked ringlands

considering that it would be working with direct injection (like that of the V6 camaro), preignition wouldnt be that big of an issue as you wouldnt be injecting the fuel until right up until the point of ignition anyway. that added in with the exhaust gas that stays in the cylinder with this design would minimize the chance of preignition. to an extent, its the same way the V6 currently operates only without a spark plug to ignite the combustion mixture.

Originally Posted by Dragoneye

HCCI is old.

Okay, not really. Last I read about it, the biggest issues they needed to overcome for production was NVH, top-end performance (above speeds of 55mph required the spark again to work), and calibration. This technology takes the complexity of DI to a WHOLE new level.

Seems pretty cool on the surface. I look forward to watching how it develops.

Great video, btw, Spike!

HCCI technology is old so to speak, but you dont see it in operation today (outside of diesels).


to further the discussion on "future" technologies... how bout GM's BAS system?
http://www.hybridcars.com/types-syst...-starters.html

another "old" technology, that is just barely starting to make its way into the mainstream automotive design.

[LostInMoscow]

Originally Posted by CamaroSpike23

such as?

Allow me to rephrase that. Problems like diesel cars had when they were first introduced.

[2ndgenz28]

If you read up on those crazy high mile cars from the past and was still a carb or early FI. They super heated the fuel to basically do like a refinery and crack the fuel molecules. The high heat and compression of like a diesel could do that right???

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Now with the new cruise matching the VW diesel MPG on the highway [42MPG for both cars] you have to wonder if that’s the end of diesel in passenger cars. No real point if they don’t get allot better mileage with the fuel costing $1.50+ more per gallon.

[Mr. Wyndham]

Originally Posted by CamaroSpike23

considering that it would be working with direct injection (like that of the V6 camaro), preignition wouldnt be that big of an issue as you wouldnt be injecting the fuel until right up until the point of ignition anyway. that added in with the exhaust gas that stays in the cylinder with this design would minimize the chance of preignition. to an extent, its the same way the V6 currently operates only without a spark plug to ignite the combustion mixture.


HCCI technology is old so to speak, but you dont see it in operation today (outside of diesels).


to further the discussion on "future" technologies... how bout GM's BAS system?
http://www.hybridcars.com/types-syst...-starters.html

another "old" technology, that is just barely starting to make its way into the mainstream automotive design.

HCCI + BAS...mmmmmmmm

Originally Posted by 2ndgenz28

Now with the new cruise matching the VW diesel MPG on the highway [42MPG for both cars] you have to wonder if that’s the end of diesel in passenger cars. No real point if they don’t get allot better mileage with the fuel costing $1.50+ more per gallon.

I recall an article reporting on the real possibility of bringing a diesel Cruze to the states. I think it was something like 45+ hwy...