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Exhaust Help

Old 05-20-2018, 04:23 PM
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Default Exhaust Help

So I installed a set of emi manifolds and risers on my gen vi 502 mag mpi. Had some alignment issues and I kept burning up exhaust tubes due to the exhaust gasses exiting pointed at the wall of the tubes , not out the back of the boat. Even tried the high $ silicone tubes . Finally ended up running an extra piece of stainless between the riser and tips in the transom. I also ended up cutting the flange off the risers to help correct the angle issue, about .5" was cut off . Im a lil worried about reversion. I assume that is the reason for the flange on the end of the risers?

So now im not burning up exhaust tubes but am now noticing a miss if I idle for more than a couple minutes. The miss goes away of I rev up a little. Should I have a muffler shop add a lil flange to the end of my risers? I have replaced the spark plugs and there was no signs of water.
I would post pics but seem to have not hit my 10th post yet ):

Last edited by jryotas; 05-20-2018 at 04:27 PM.
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Old 05-20-2018, 04:24 PM
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Old 05-20-2018, 04:24 PM
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Old 05-20-2018, 04:25 PM
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Old 05-20-2018, 04:26 PM
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Old 05-20-2018, 04:42 PM
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Might try these.
https://www.jamestowndistributors.co...t.do?pid=63768
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Old 05-20-2018, 04:53 PM
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I did consider those when I first switched from black rubber to the silicone but even those would not fix the alignment issue and exhaust gasses would still be directed toward the tubes , not out the back of the boat. My reason for cutting the ends of the risers was to be able still have a downward angle for the exhaust . Before cutting, I had almost an uphill exit due to the alignment issue.
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Old 05-20-2018, 07:22 PM
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Take 1x4 piece of wood put it in between your risers and manifold, check the angle for the correct pitch. If this works, take riser to a machine shop and have them make it out of aluminum. That is what I did to my gill manifold years ago.
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Old 05-20-2018, 08:49 PM
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Man...Those tails would have me nervous about reversion.

1. The water exit is in close proximity to valves
2. There isnít much slope preventing water from going back to valves.

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Old 05-20-2018, 09:50 PM
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Originally Posted by jryotas View Post
that was the absolute last thing you wanted to do...
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