Gudday Harry,
I am not a LAME or any sort of mechanic, but I've been around a few engines ...
Not disputing that the technique you described works, however, I suspect that the engine cylinder pressure does not change by raising or lowering the rpms, after all if an engine has a (for example) 12 to 1 compression ratio, it will produce it (12/1) at 500 rpm or 2500 rpm.
I tend to favour the higher engine temps burning off combustible contaminants and also increased engine vibes shaking loose any solid stickies that may come loose, such as carbon (before it burns off) or oxidisation etc.
Obviously 1700 rpm is enough in your example and I guess if it can be done at that rpm all the better.
Just my two cents, now standing by for correction.
Cheers,
ABX
Last edited by ABX; 9th Feb 2007 at 10:30.
Reason: 1700 rpm