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Besides the cost of aluminum blocks, what other downsides, if any, are there compared to regular iron blocks? I understand they require a different type of oiling system or something?
 

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They have to use cylinder sleeves, because aluminum isn't durable enough. I don't know for sure, but it seems that the mains would have to be really thich to put up with the stress too.
 

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the main and everything else is really thick but I kinda like the idea of being able to just pull out a sleve and put in another when it is time for a rebuild

I don't see why the oiling would be different, the blocks do offer a huge weight savings though but at a major price tag
 

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Aluminum expands a good bit more than iron with temperure. This means keeping clearances right between cold and hot is a pain and keeping things sealed up is more of a challange too. The factory engines available today with aluminum blocks have a ton of R&D behind them to get them to the point of being reliable.

Steve S.
 
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