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Also I forgot to mention that I had ran some tests on Basjoo's old engine before replacing it. I applied various levels of vacuum via an external source to the crankcase and recorded the data at various rpm and vacuum levels (no load) using his supermid injector duration reading. I saw no difference at all on the vacuum vs no vacuum that was noticeable on the readings.
At 7"hg of vac the seals began to sing and it became worse with increasing vacuum. Not sure how one would get around that unless they kept less than 5" of vac.
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