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Thanks Ed,
Depending on whether you want to use both the secondary and Primary bores you can mill quite a bit off. However, I did not do that as it was just too convent to attached the air inlet ducting with the stock bolts.
That's what I meant about complicating the inlet ducting. I'll be looking, however, at milling away any superfluous bosses, that were only there to support brackets no longer in use.
If you check I think you will find that even when the primary butterfly is fully open, the secondaries have a bit of "lag" and are not 100% open. I redid that linkage to force the secondary to 100% anytime the primary was 100%. I also reworked the springs so that should the throttle cable fail, the butterflys got to full open (WOT) rather than close as on an automobile.
I was looking at exactly the same thing, and noticing that the secondaries started opening before the primaries were even 1/4 open. I'm going to make a new arm for the secondary shaft with a longer leverage; and a new link, with a slot on one end so that the secondaries don't start to open until the primaries are about 1/2 open.
Regards,
Dale R.
(who finally remembered to delete the accumulated attachments from this.)
R
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