Originally Posted by Jono Garton
I would be interested in your thoughts on the following-
When you drive your car, do you drive it constantly on the red line for long periods of time? If so how long does you car last?
But is driving at WOT strictly the same as redlining (max revs)? Will an outboard with the 'right size' prop actually redline the engine?
I'm pretty certain my (old petrol) car could easily sustained 5200 to 5500 rpm - it would certainly do 4500 - for hours on end. Trouble is that would have been about 120mph so I never tried - so why not same for an outboard?
Can you actually 'damage' an engine just by driving it at sustained high revs as long as it's well within its cooling capability, has well maintained lubrication and is warmed up properly? Of course it has to be true that the engine must be sustaining more wear than it would in the same period at lower revs but is the rate of wear materially higher (eg wear sustained per 10,000,000 revs).
Last time I (accidentally) really redlined the car's engine the engine to over 6500 rpm the management system rather brutally cut the power itself - to my surprise and embarassement