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Al has been used for years Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Mon, 30 Aug 2004 12:43:30
In Reply to: Are most high end automakers building engines out of, J, Mon, 30 Aug 2004 07:46:33 Members do not see ads below this line. - Help Keep This Site Online - Signup |
With varying success. The Vega engine was an example of how not to do it.
There is aluminum blocks, and there are aluminum cylinders. Many engines use aluminum blocks, but have steel (iron) cylinder liners. Others use aluminum as the cylinder wall, but treat the relatively soft aluminum to alloy it - silica was one approach, and I believe there are many others. This provides the weight savings of aluminum, requires fewer assembly steps, and avoids the issues with difference in thermal expansion.
I'd say most are using aluminum, mostly because it saves a ton of weight. And that's weight out near the front. With a lighter engine, you can move the engine farther forward and still keep a decent weight balance. Farther forward means more interior space for the same length car. The 'long as Kansas' hoods of the '60s are out.
As to durability, I don't think it's much of a concern. You really don't see cars burning a lot of oil these days. And if they do, it's more likely a valve seal problem or a cracked ring than worn cylinder liners. 10, 15 years ago it was common to see cars laying down smoke screens. It still happens today, but it's a lot rarer.
posted by 192.249....
, Mon, 30 Aug 2004 12:43:30 <-- Viewing This Message
, Mon, 30 Aug 2004 11:25:58
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