I have a question - are XR6 engines designed and built 'tougher' than normal 4.0L engines?
I was thinking about it today, and since everyone would be rev'ing their XR's occasionally.. wouldn't they have made the engine parts more durable? I mean to pull 164kW at 5000 rpm, they'd have to anticipate people would be reving to get the power? Whats stopping the engine blowing up if every second day someone races another person off the lights or snaps second gear occasionally?
The mechanical strength of the engines are the same.
The only part of the engine which has increased strength are the valve springs. This is to cope with the extra lift cam.
The block, crank, pistons, rods, etc, are all the same.
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