Reversion problems with 47's with 525EFI's...
#1
Reversion problems with 47's with 525EFI's...
I am being plagued by reversion issues on my back two motors. I had discovered reversion problems last year and I had CMI make me custom full length dry tails (dry to 1" of the end) and I removed the silent choice. Thought that would solve my problem for sure. Had to do some other work on the motors a few weeks ago so I removed the headers and lo and behold, I am still seeing signs of reversion and had one stuck valve. Now, I also put on those sexy stainless steel external flappers and the only thing I can think of is that the flappers are too heavy and they are trapping too much water in the pipe and its creeping back up.. Here are my questions:
1) Any of you 47/525 owners experience reversion and what have you done to solve it?
2) Anyone run without ANY external flappers at all? My concern is backwash...
Any other ideas / suggestions welcome...
1) Any of you 47/525 owners experience reversion and what have you done to solve it?
2) Anyone run without ANY external flappers at all? My concern is backwash...
Any other ideas / suggestions welcome...
#4
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Join Date: Jul 2010
Location: Dighton MA
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I believe these would solve your reversion issues.
http://www.gibsonperformance.com/marine-turndown.php
Dean
http://www.gibsonperformance.com/marine-turndown.php
Dean
#7
I believe these would solve your reversion issues.
http://www.gibsonperformance.com/marine-turndown.php
Dean
http://www.gibsonperformance.com/marine-turndown.php
Dean
#9
Absolutely positive. I have pressure tested all six headers extensively. I have water intrusion and salt crystals in cylinders 3,4,7 and 8 on both motors. Those cylinders correspond to the two bottom pipes of the collectors on both sides of the motor. Even if I hadn't pressure tested, which I have, the odds of leaks in the exact same four primaries on both engines is low.
#10
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Join Date: Aug 2012
Location: Collierville, TN and Pickwick Lake
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Try those salisbury flappers that clamp on the OD od the pipe. http://www.cpperformance.com/p-13183...l-flapper.aspx