Boats For Sale:
waves pushing water |
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HOLESHOT 
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Joined: July-08-2005 Location: United States Status: Offline Points: 47 |
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 Topic: waves pushing waterPosted: May-15-2006 at 1:01am |
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do you guys have an opinion on waves pushing water up the exhaust and in to the engine ?
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IF IT HAS A SPARKPLUG I CAN FIX IT
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nuttyskier2002
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Joined: September-28-2005 Location: United States Status: Offline Points: 669 |
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Posted: May-15-2006 at 6:31am |
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Does your exhaust outlets have flaps on them? These act as one way check valves that limit the water trying to rush into the exhaust pipe. Also the risers (if your exhaust is equipped with them) help prevent this from happening as well. A third thing is the camshaft. Marine cams are ground with less overlap (time when intake and exhaust valves are both open) but this only comes into play when th engine is running.
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95 Malibu Echelon w/Mercruiser 350 Magnum Skier
Former boats: 88 Ski Centurion Tru Trac II 59 Chris Craft Capri (woody) |
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Munday
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Joined: August-17-2004 Location: United States Status: Offline Points: 538 |
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Posted: May-15-2006 at 5:17pm |
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Man its sure no fun if it does happen.Make sure it doesn't by any means possible.I've seen it and if your short on tools it can ruin a boating.
good luck Munday |
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3363 |
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Posted: May-15-2006 at 6:42pm |
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Seems like ther are plenty of tools around every time we go skiing...
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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HOLESHOT
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Posted: May-15-2006 at 8:25pm |
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well im not saying that it has happened to me i was just wondering what ppl thought about the idea i dont think its likly but maybe possible
so please guys give ur two cents |
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IF IT HAS A SPARKPLUG I CAN FIX IT
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David F
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Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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Posted: May-16-2006 at 9:53am |
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I am not sure what you are wanting, but my $.02 is that if you have the exhaust outlet flaps, you are as safe as you are going to get. If your engine does not have the exhaust riser, then I would be careful when backing hard and avoid abrubt stops in following seas (i.e. a roller coming in from behind).
Also, I am not really sure how it would happen other than using an aftermarket cam with overlap. Basically, the overlap leaves the exhaust valve open a bit as the piston starts to travel down (right? Helps scavenge the cylinder?) I guess this can draw water in. Otherwise, the exhaust forces will prevent water from coming in if the engine is running. |
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Tim D
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Posted: May-16-2006 at 1:15pm |
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If there is air in the exhaust(manifold & plumbing) water coming in will not be able to displace very much.
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Tim D
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73skier
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Joined: April-12-2005 Location: United States Status: Offline Points: 19 |
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Posted: June-06-2006 at 10:56am |
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don't see how correct craft would make a boat with out flaps and sell it. In 73 they didn't even come with flaps thought it was an aftermarket thing to make them quiet or not as loud
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p/allen
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Joined: March-14-2006 Location: Dixon Illinois Status: Offline Points: 942 |
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Posted: June-06-2006 at 11:26pm |
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The only way i can see it happening is if you are sitting on a lift with the exaust a few inches out of the water and a wave comes in and pushes water up your exaust. Otherwise your exaust is under water any way . Awave is mostly an up and down motion not a forward motion inless it is rolling . my .02
Pat |
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Tim D
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Posted: June-06-2006 at 11:40pm |
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If a wave pushes water up the exhaust, I don't think it can compress/displace the air very much that is already in there.
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Tim D
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79nautique
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Posted: June-07-2006 at 8:56am |
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if you have mufflers it doesn't matter, if you don't have mufflers then it could be a concern.
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stang72
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Posted: June-07-2006 at 10:43am |
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I'm thinked Tim D's point makes sense...air should stop any water from moving to far and at the elbow it would have to be forced pretty hard.
Many olded CC's had no exaust flaps...my 62 is without them... |
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p/allen
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Posted: June-07-2006 at 6:00pm |
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Tim D's point is correct if the exaust is completly sealed by water . But if the tube were only 1/2 full then the air would rush out above the water providing the water was moving quickly. I believe this is a very unlikely scenario and probably would not have enough force for the water to reach the engine .
Pat |
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SS-201
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Posted: June-12-2006 at 5:20am |
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CC exhaust are a closed system, reversison is not a problem, the exhaut system is higher than the stringers.
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SS 201
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p/allen
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Posted: June-16-2006 at 8:01am |
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Some how the coolant water has to mix with the exhaust , so i guess i dont know what you mean by a closed system
Pat |
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79nautique
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Posted: June-16-2006 at 8:13am |
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The exhaust is seperate on a closed system and uses fresh water for the exhaust and the engine block get's the closed system water.
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Tim D
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Posted: June-16-2006 at 8:51am |
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The exhaust and the water meet in the part called the elbow. The exhaust goes in the center of the manifold. The water goes down veins inside the outer walls of the manifold. If you ever took one apart, you would be impressed with the casting process.
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Tim D
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