As I understand it reversion in general terms is the sucking of 'sea' water into the exhaust pipe outlets due to certain cam design parameters. That is not the question.

What are the actual proplems that reversion causes?
1.) Corrosion only?
2.) Hydraulic lock of pistons?
3.) Other????????

Corrosion for sure, if bad enough it can hydrolock the engine. It can make the exhaust valves brittle enough to snap off. Water can get into the oil wiping out the engine. The list goes on..

Worst case scenario-the water hydro locks the piston,bends or breaks the connecting rod destroying the motor,more likely though,water quenching the exhaust valve makes it brittle then head breaks off stem then destroys the motor. Mild reversion-milkshake oil,rust and pitting in affected cylinders,Smitty

check,you beat me while i was typing,Smitty

i lost 2 engines last year to it

vrooom vroom bang! got the picture...with reversion the engine will be very short lived. run dry exhaust and forgedaboutit

Son of a gun! Almost sorry I asked.

Does the hydraulic lock happen in a middle of a run lets say or upon start up after turning the engine off and restart?

What's the best/easiest way to find out if you have a reversion issue?

What exhaust are you running and what cam.I was told by my exhaust manifold company to run the motor at idle for ten to fifteen minutes with my quit system in the closed position.Then shut off engine and remove riser and see if the manifold is wet inside.If it is then you have trouble.

Nordic95

Sorry Bill
I had to warn you though....
It's well worth checking for peace of mind.

Please do not appologize. This is need to know stuff.

Since my o2 wide band sensor survived a 12 min. run with a lot of idling I am hopefull BUT will still conduct tests suggested.

The cam timing @0.050 is....
- intake opens 6.0 BTDC
- intake closes 44.0 ATDC
- intake duration 230
- exhaust opens 57.0 BBDC
- exhaust closes (1.0) BTDC
- exhaust duration 236

The exhaust is stock Merc 496HO with turbulators removed.