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How would mating the IM to the block with metal help it cool down any faster? Cold is a lack of energy.... if the IM is already cool, why would it need to cool more?
Or are you referencing the motor cooling down sooner? I'm not really sure I understand the angle of how this is bad. Honda does what they do because it is cost effective, and most people don't care about this type of thing anyway.
I have not known a phenolic spacer to be a negative addition for power production or metal metal fatigue in any light. The only possible down side, is slightly lowered fuel economy, as the incoming air is slightly cooler, requiring more fuel to be sprayed.
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