Quote:
Originally Posted by Jeff Higgins
jcge, I'll ask Bernie about some 935 boost compensating system photos next time I see him. .....I'm sure getting some photos wouldn't be a big deal.
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I'll play around with them (edit - the screws) some more and see if I can figure out what is going on with them. ...
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Jeff - thanks a lot - photos would be great !!
Back to the screws and flyweights....(more particularly the lightened flyweights of the 935 photo)
Lightening the flyweights will have the effect of extending the rpm range of the pump - the lighter the flyweights acting against the standard springs, the higher the pump shaft speed required to progress the space cam from its idle to redline position (not to be confused with closed throttle vs WOT)
I've seen a few posts on this forum that report the space cam as having no influence on injection volume beyond 4000 engine rpm (tell me if I've misinterpreted), but I don't think this is correct. The following document Y 428 904 601 for 911/72 motor (edit 2.8 RSR motor) shows non linearity well beyond 4000 engine rpm (maybe the reference is to 4000 pump rpm = 8000 engine rpm..)
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(C) B.Buschen
I've not run up a flyweight assy at speed and verified that the space cam is at full travel at that speed (4000 or 8000rpm) nor do I currently have capability to do so. In any case I'd love to know the spec/drawing for the lightened flyweights.
Again - all observation/speculation on my part - I'm not an authority on this subject (but others on this forum are......)
Regards,
John