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Cobra Exhaust Bellows Question
I'm trying to figure out why the bottom of the exhaust
bellows is intentionally open. It seems to me this would allow "air" (exhaust) to get to the prop, obviously not a good thing. What's the reason for this? Thanks -- Mark Triple Z is spam control. |
#2
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"Mark" wrote in message th.net... I'm trying to figure out why the bottom of the exhaust bellows is intentionally open. It seems to me this would allow "air" (exhaust) to get to the prop, obviously not a good thing. The holes relieve exhaust back pressure that could "swell up" the exhaust bellows which would then press against the u-joint bellows which would then contact the spinning u-joints and wear a hole thru it. The problem is most pronounced on heavier boats while getting up on plane when the prop is deep in the water and is not moving fast enough to help "draw" the exhaust out thru the hub. MercCruiser had that problem years ago and that is when they went to an exhuast tube for larger engines, instead of the bellows. A few boats sunk because of the holes worn thru the bellows. Bill Grannis service manager |
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