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Old 07-09-2007, 08:56 PM
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Unhappy water problem

I have a 1990 27ft pachange 454 and have a revertion problem only when I'm at an idle. I run a river between two lakes that takes an hour each way to get through and only suck water back into the engine when I idle in the no wake zone. My cam duration is 218 - 224 so I don't think thats the problem. I have a stock exhaust which is the two water filled mufflers on each side of the boat. I really need some help on this one ,It's getting expensive.
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Old 07-10-2007, 12:04 AM
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Do you have flaps on your exhaust tips? If not, get some.
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Old 07-10-2007, 12:27 AM
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Are you running an automotive cam? What's the lobe centerline?


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Old 07-10-2007, 10:16 PM
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Well Darrell, I always keep all my paper work for anything I buy for my boat in a file except this invoice I guess. I will need to look some more. I do know it is a automotive cam with a duration of 218-224.
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Old 07-11-2007, 12:56 AM
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Has the reversion always occured after the cam swap?


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Old 07-11-2007, 06:23 AM
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I installed the cam last year and did not have any problem,but I did not run the river last year so I was not idleing for long periods of time.
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Old 07-11-2007, 07:17 AM
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Make sure you have the rubber flaps inside the wxhaust tips at the exit.
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Old 07-11-2007, 11:23 AM
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As far as the exhaust flaps go my outlets are out of the water about 6-8 inchs when I'm moving at idle so I don't think water is getting in that way.
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Old 07-11-2007, 11:40 AM
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This took my motor out. Swapped to dry exhaust so I will never have to worry again. The new headers and pipes were a bit expesive but if I had done this before it would have been a bargain compared to the rebuild and new heads. Dry pipes are REAL loud so if you area will not allow or you don't want to deal with the noise you can put the clamp on mufflers on the back. Good luck
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Old 07-11-2007, 02:49 PM
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You should really look at the exhaust muffler installation. Is it possible that the riser outlets are equal or lower than the muffler inlets when the boat is sitting in the water? If so, water can be backing right up the exhaust hose into the riser. There is not enough exhaust pressure to push the water out of the muffler, so it just accumulates back up the hose into the riser. The riser outlets should be at least 2'+ higher than the inlet to the mufflers.

Good Luck!
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