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Old 01-24-2012, 04:32 PM   #11 (permalink)
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That's a crazy,radical piston. domed with a cavity. Lots of extra surface area. But Mazda says it wastes less heat by keeping the flame contained in the cavity.

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Old 01-24-2012, 04:36 PM   #12 (permalink)
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Quote:
Originally Posted by Old Tele man View Post
...here in Tucson, AZ, the diesel-to-gasoline cost ratio is 1.28:1 [$4.059(d) / $3.179(g)], so in order for diesel to come out "ahead," it had better get 28% better fuel economy than its equivalent gasoline-powered counterpart...which means >51MPG!

...and, that's NOT considering any other cost "uppers" such as the higher "going-in" cost of the diesel engine versus the gasoline engine.
Same in California. The numbers I was quoting from gasbuddy are in Seattle where the gap seems to be slightly smaller but not by much.
Quote:
Originally Posted by CigaR007 View Post
Oddly enough, diesel used to be cheaper than gasoline, at least where I live.
When most of the developed world replaced their old gasoline cars with diesels, that all changed. The US is a net importer of crude oil and gasoline and a net exporter of diesel fuel. If this trend continues, the diesel passenger car doesn't have a future.
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Old 01-24-2012, 06:29 PM   #13 (permalink)
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...yeah, same here! I can recall it being 89.9 a gallon when gasoline was $1.50-$2.00 range.
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Old 01-24-2012, 07:39 PM   #14 (permalink)
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Quote:
Originally Posted by Old Tele man View Post
...yeah, same here! I can recall it being 89.9 a gallon when gasoline was $1.50-$2.00 range.
It turned the corner, after 2003-04. US fed requirements to reduce sulfur increased refinery costs & raised the retail prices. Our Euro friends still pay comparatively less for diesel than petrol, even though they are twice our US costs. Some bean counters have an alternate explanation, because of the slowed economy, decreased US driving AND more efficient gas-powered vehicles, demand and prices decreased while the truck/diesel usage is stable and prices regularly increased. The differential reflects those market dynamics.

The trending future will steadily increase prices as the majority of new car sales in Europe are still in diesel. Booming new car sales in India, China, Russia & Brazil include diesels.
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Old 01-24-2012, 11:01 PM   #15 (permalink)
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Quote:
Originally Posted by CigaR007 View Post
Oddly enough, diesel used to be cheaper than gasoline, at least where I live.
Same here, my truck misses the $0.99 diesel it was used to.

Quote:
Originally Posted by sendler View Post
That's a crazy,radical piston. domed with a cavity. Lots of extra surface area. But Mazda says it wastes less heat by keeping the flame contained in the cavity.
The VW TDI uses a similar reverse dome with a peak piston. It creates less "wall stick" and more evenly distributes the fuel.


The good thing about a lower CR is you can add more boost without excessive peak cylinder pressures.
Wonder what size nozzles they are using and when bigger ones will be available
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Old 01-26-2012, 12:53 PM   #16 (permalink)
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Quote:
Originally Posted by CigaR007 View Post
Oddly enough, diesel used to be cheaper than gasoline, at least where I live.
Only due to differences in taxes.

Diesel is slightly more expensive to refine, but in Europe most countries put less taxes on diesel as it is the transport sector's fuel.

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