[modeleng] Conway

Hi
 
I had Conway running this evening and I have a problem with the engine blower 
(not the steam blower).  It's so fierce that even when running I'm constantly 
blowing the safety valve.  Also I constantly have a shower of sparks.  This is 
enough to draw the fire into the bottom of the smokebox.  The chimney top is 
getting so hot, it's gone a purple colour.
 
Do I increase the jet size or reduce it to reduce the draught from the engine?
 
Thanks for any assistance on this problem.
 
Cheers
 
Ken
 
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