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Jet Boats
General Jet Boat Discussions
Bad news...Piston cracked.
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<blockquote data-quote="Lil&#039; Blue Rude" data-source="post: 387772" data-attributes="member: 4627"><p>Looks like it over heated to me. Best I can tell the exhaust side of the pistons the one that's missing a chunk. That's the first part of a piston to go when they over heat because it's exposed to more heat then the other half of the piston that's being cooled by incoming air/fuel mix. When the exhaust port starts to open hot gases shower the side of the piston that still exposed in the exhaust port window. That combined with the fact that part of the piston is only in full contact with the cylinder wall when at bottom dead center it doesn't have much time to transfer heat out of the piston into the cylinder wall. You can take a look at the bottom side of the piston and it will probably have some carbon build up under it which is another sign the piston was getting over heated. I'd say that cylinder went lean over heated and just started eating away at the piston. Luck it didn't break the ring and eat he cylinder up.</p></blockquote><p></p>
[QUOTE="Lil' Blue Rude, post: 387772, member: 4627"] Looks like it over heated to me. Best I can tell the exhaust side of the pistons the one that's missing a chunk. That's the first part of a piston to go when they over heat because it's exposed to more heat then the other half of the piston that's being cooled by incoming air/fuel mix. When the exhaust port starts to open hot gases shower the side of the piston that still exposed in the exhaust port window. That combined with the fact that part of the piston is only in full contact with the cylinder wall when at bottom dead center it doesn't have much time to transfer heat out of the piston into the cylinder wall. You can take a look at the bottom side of the piston and it will probably have some carbon build up under it which is another sign the piston was getting over heated. I'd say that cylinder went lean over heated and just started eating away at the piston. Luck it didn't break the ring and eat he cylinder up. [/QUOTE]
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Bad news...Piston cracked.
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