When washing engines, it's not like the small block Fords and Chevys of yester-decade. There used to be very little space for water to collect and where it did, it was harmless.
Nowadays, you got spark plugs that slip down into 8" tubes and the only thing keeping water out is the crappy boot on the COP. Not an impressive setup even in the best of conditions. Any moisture trapped in there will only accelerate oxidation of the plug body which only goes to exaggerate the "broken plug" issue.
I don't really see a problem with cleaning the engine compartment as long as you use low pressure water and stay completely away from the top of the engine. Using any sort of pressure washer is asking for an $800 tune-up.
__________________
Bill Cohron - The Mad Doctor
Power Hungry Performance - The
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