Cause of my reversion
#11
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I never saw my risers sweating. I run a regular thermostat housing and a circulating pump. I do not like the crossovers.. Too many issues with sweeping water temps, condensation and cold oil temps. The river water temp where I live is 45-50 in april..
#12
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Location: Jeffersonville, IN
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Where are you dumping the water from? The jump hose? I have the same problem with my EMI Thunders. The problem was so bad I opted to change the cam to basically what you have now. We are going to start this week and if there is reversion I am going to dump water as well. I talked with Drew as well and told me the same thing, but had no advice on where to get the fittings, so if you figure it out please post as it would be helpful. One more note, I have a friend with a 25' Nordic with a popped out 502 and a larger cam (236 @ .50, 112 LSA, 614 lift, 109 ICL) with the same Eddie Marine exhaust as you, and he has no problem... GO FIGURE!
#13
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only issues i have seen with the emi's is that if your engine is not up to temperture the maniflds will sweat internally because their is way too much cold water running through them..make sure your enfine is up to temp's first..if you see your risers sweating on the outside you can be dam sure their sweating on the inside..
#14
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Where are you dumping the water from? The jump hose? I have the same problem with my EMI Thunders. The problem was so bad I opted to change the cam to basically what you have now. We are going to start this week and if there is reversion I am going to dump water as well. I talked with Drew as well and told me the same thing, but had no advice on where to get the fittings, so if you figure it out please post as it would be helpful. One more note, I have a friend with a 25' Nordic with a popped out 502 and a larger cam (236 @ .50, 112 LSA, 614 lift, 109 ICL) with the same Eddie Marine exhaust as you, and he has no problem... GO FIGURE!
#15
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Where are you dumping the water from? The jump hose? I have the same problem with my EMI Thunders. The problem was so bad I opted to change the cam to basically what you have now. We are going to start this week and if there is reversion I am going to dump water as well. I talked with Drew as well and told me the same thing, but had no advice on where to get the fittings, so if you figure it out please post as it would be helpful. One more note, I have a friend with a 25' Nordic with a popped out 502 and a larger cam (236 @ .50, 112 LSA, 614 lift, 109 ICL) with the same Eddie Marine exhaust as you, and he has no problem... GO FIGURE!
Check this article out
http://www.michel-christen.com/ExhaustElbows.pdf
#16
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I can idle my boat all day with the silent choice on with no reversion. But as soon as i open them up 1 minute later they start missing and the idle gets sloppy and dies out.
Back pressure seems to stop the Resonating Reversion
http://www.michel-christen.com/ExhaustElbows.pdf
#17
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Reversion is not always from the cam size
Check this article out
http://www.michel-christen.com/ExhaustElbows.pdf
Check this article out
http://www.michel-christen.com/ExhaustElbows.pdf
#18
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Update: This is the first time out in 4 years with NO REVERSION problems. I have to say DREW from DREW MARINE is a genius. I bought 2 pairs of shotgun III silencers from them and installed 4 tee fittings 3/4 npt x 3/4 slip x 1/2 npt on the outlets of the aluminum EMI manifolds. Eddie marine made these fittings for me. Then I installed 1/2 npt x 1/2 brass barb fittings and ran heater hose out to 2 water dumps on each side of the boat. I opened the exhaust to the loud mode idled out in the no wake zone and WOW no load up, sounded smooth and even.Amazing..Boat ran great and seem to have more power.
Very Happy
Very Happy