- Thread starter David G
- Start date
DoubleO7
Well-known Member
- Location
- Crystal River, FL
The engines are in 2019 Mazda 3 and another model.
Tgrasher
Well-known Member
- Location
- South Southern illinois
I'll wait and see, I remember the big hoopla about the rotary engine.
DoubleO7
Well-known Member
- Location
- Crystal River, FL
Yea, they were a big flop. Only sold like 1.8 million of them.
MarkB_MI
Well-known Member
- Location
- Motown USA
<a href="https://news.mazdausa.com/2017-10-24-mazda-next-generation-technology-press-information/">This page on the Mazda</a> site explains it in more detail.
So what they're doing is to boost the compression ratio up close to that of a diesel. The combustion chamber isn't quite hot enough to ignite the fuel-air mixture, but when the spark plug fires the additional heat causes a diesel-like ignition. But not quite a detonation, either. Depending on operating conditions, the engine may operate as a regular spark-ignited gas engine or as a spark/compression-ignited engine.
It seems that what they're trying to do is to move as much of the combustion process as possible between top-dead-center and 90 degrees after TDC, which is when the piston is accelerating. Gasoline engines typically fire before TDC to try to get maximum combustion chamber pressure in this region. Using the spark/compression ignition, Mazda is able to retard ignition to TDC and still get the maximum pressure during the 90 degree sweet spot.
So what they're doing is to boost the compression ratio up close to that of a diesel. The combustion chamber isn't quite hot enough to ignite the fuel-air mixture, but when the spark plug fires the additional heat causes a diesel-like ignition. But not quite a detonation, either. Depending on operating conditions, the engine may operate as a regular spark-ignited gas engine or as a spark/compression-ignited engine.
It seems that what they're trying to do is to move as much of the combustion process as possible between top-dead-center and 90 degrees after TDC, which is when the piston is accelerating. Gasoline engines typically fire before TDC to try to get maximum combustion chamber pressure in this region. Using the spark/compression ignition, Mazda is able to retard ignition to TDC and still get the maximum pressure during the 90 degree sweet spot.
buickanddeere
Well-known Member
Combustion initiation and a clean burn at idle and at low rpm . Is an altogether different kettle of fish than high power output at any rpm .
DI gas use staged injection of fuel with lean on the perimeter and a richer kernel in the middle of the chamber chamber when putting around . And extreme swirl to control detonation along with injection of fuel just Prior to the the spark . To allow high compression without detonation at high power levels .
Diesel, Kerosene . Gasoline , alcohol , LP ,Natural gas and hydrogen . In that order of dirty to clean .
In time #2 diesel will be a niche fuel for large HD only applications. as #4 diesel and #6 diesel is now .
MarkB_MI
Well-known Member
- Location
- Motown USA
> In time #2 diesel will be a niche fuel for large HD only applications. as #4 diesel and #6 diesel is now .
Are there any engines in production today that require or even prefer #1?
Are there any engines in production today that require or even prefer #1?
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