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Sedans Chrysler 300/300C/300C SRT-8 Chrylser 300C Oil
24 messages, Last post on Mar 17, 2009 at 7:58 AM
You are in the Chrysler 300/300C/300C SRT-8 Forum. Your Hosts are pat & karens
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Replying to: jloiacono (Jun 06, 2008 9:22 pm) |
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Replying to: coolrunning (Mar 25, 2008 10:54 am) No, they aren't. It's an iron block with aluminum heads. Moderator: It's Chrysler not "Chrylser".
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Replying to: batista (Jun 07, 2008 8:24 pm) What does the metallurgy of the block and the heads have to do with engine efficiency? Best Regards, Shipo
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Replying to: shipo (Jun 08, 2008 10:48 am)
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Replying to: batista (Jun 08, 2008 12:30 pm) FWIW, I'm thinking that you'd be hard pressed to find another car the size of a 300, and with as much power as the Hemi that is capable of getting fuel economy as good as the 300C. Best Regards, Shipo |
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Replying to: shipo (Jun 08, 2008 10:48 am) What does the metallurgy of the block and the heads have to do with engine efficiency? Iron atomic mass= 55.85, Aluminum=26.98. Therefore an iron engine of the same volume weighs more than twice that of aluminum.  Aluminum is more expensive.
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Replying to: smithed (Jun 18, 2008 9:29 am) 1) I've been turning a wrench for lots of years, and I've yet to see any aluminum heads that have roughly the same volume of metal as a comparable iron head. Said another way, while I absolutely agree that an aluminum head capable of doing the same job as an iron head will weigh less, it will weigh in at well over half of the weight. Why? I suspect that you know this already, but I'll answer it anyway: Aluminum doesn't have the same structural integrity as does iron, and so more of it needs to be used to match the capabilities of the "smaller" iron head. 2) Implied in original post about the aluminum construction was that an aluminum engine would be more efficient than a comparable iron engine. I'm having a problem accepting that. 3) Given that aluminum can conduct more heat, aluminum engines have a tendency to draw considerably more heat out of the combustion chamber on every power stoke, and as such, engine efficiency has a tendency to drop. I remember first reading about this phenomena in a study prepared by GM back in the 1960s when they were developing their all-aluminum 427 for racing Corvettes. They performed the study because they were surprised when their new aluminum engine put out rather less power than the identical (from a bore, stroke, timing and cam profile) iron engine. Best Regards, Shipo
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Replying to: shipo (Jun 18, 2008 10:33 am)  I wonder if, in a vehicle that is lighter because of an aluminum engine of the same size, that might be more efficient, even if the engine is not as efficient taken by itself. Not arguing, just wondering.
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Replying to: smithed (Jun 18, 2008 11:34 am) At least, that's how I recall the summation.  Best Regards, Shipo |
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Replying to: shipo (Oct 27, 2006 4:51 am) |
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