QUESTION
If it is "normal" for some part of the boost signal to leak out through the rod/diaphragm joint, wouldn't it foul the air-fuel ratio (little bit) causing engine to run rich?
Could this be mitigated by sealing the joint with high temperature RTV compound?
C.G. - USA
ANSWER
The boost signal will not leak out through the rod/diaphragm joint as the diaphragm is sandwiched between two large washers.
However, when testing worn waste-gates it has been noted that air will escape from a badly worn valve stem and guide.
Even with a worn relief valve and guide leaking air, this amount would be so small it would it would have little or no effect on the air-fuel ratio.
It is not a good idea to seal the joint with regular RTV as it is not usually designed to handle high exhaust temperatures.
Regular RTV is acidic and can be quite corrosive in certain circumstances, when the compound and vapours come into contact with cast-iron.
Copyright © 2012 Lotus Marques
If it is "normal" for some part of the boost signal to leak out through the rod/diaphragm joint, wouldn't it foul the air-fuel ratio (little bit) causing engine to run rich?
Could this be mitigated by sealing the joint with high temperature RTV compound?
C.G. - USA
ANSWER
The boost signal will not leak out through the rod/diaphragm joint as the diaphragm is sandwiched between two large washers.
However, when testing worn waste-gates it has been noted that air will escape from a badly worn valve stem and guide.
Even with a worn relief valve and guide leaking air, this amount would be so small it would it would have little or no effect on the air-fuel ratio.
It is not a good idea to seal the joint with regular RTV as it is not usually designed to handle high exhaust temperatures.
Regular RTV is acidic and can be quite corrosive in certain circumstances, when the compound and vapours come into contact with cast-iron.
Copyright © 2012 Lotus Marques
