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Bt Doctur

Thru hull exaust and reversion

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Formula with thru hull into the swim platform exaust system. Have a bad reversion issue.

Anyone else have problems?

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Reversion can be caused by a CHEAP engine replacement  job.  Using short old risers on a newer overlapping cam in a rebuild.  Very common problem. Cheap & or inexperienced mechanics.

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Go to offshoreonly.com you will find more help.  Many factors can contribute to this.  The Rise height is one, cam if you modified it, The platform has internal baffles that could be gone.  If you back up to fast water will get in..   

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3 hours ago, jdsdls05 said:

Go to offshoreonly.com you will find more help.  Many factors can contribute to this.  The Rise height is one, cam if you modified it, The platform has internal baffles that could be gone.  If you back up to fast water will get in..   

yup go there.  more than likely to short of riser. 

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No, shutters in place and working. original cam, reputable engine builder, no blown head gaskets, 3 inch extentions.new heads This pic has maybe 2 hours run time.

going to extend the riser outlets and see if that works

DSCN4197.jpg

DSCN4198.jpg

 

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To put a finish on this post the reversion was cured by extending the exaust outlet approx 10 inches and cutting in a  10 deg uplift to center it on the 4 inch exaust so not to burn a hole thru it again .2 inch  SS thin wall tubing was used to extend the outlet.

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A fully / over loaded stern of a boat can cause this problem also......... Then it can never be caught when time to trouble shoot.  Lighter stern.

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