Thor Forums

[Chance]

Originally Posted by The_Breeze

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Aluminum will (and should) getter a smaller bore because it's harder to dissipate the heat. Heat transfer happens quicker in an aluminum block where steel retains the heat within the cylinder and heat transfer is slower, allowing the coolant ports to work their magic but increase the wear on pistons, rings and oil. Smaller bores in aluminum sort of have the same effect - keeping the cylinder walls cool (relatively) and engine light weight.

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I was referring to structural strength and stiffness of aluminum versus cast iron blocks, not heat transfer.