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Old 04-27-2010, 07:33 PM
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Hobbsy
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Default RE: Irvine 72 tach readings
Bill, this is an Irvine Q-72 from the mid 80s and it turns an APC 14x6 at 10,000 rpm like most .91s do I run it on Fox 5% fuel with 20% castor. The one with the red head is a Q-40, the Q-40 has the same stroke as a .46 but a .030" smaller bore than the standard 40.
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