Built a 6-71 Detroit that was missing the plate that the emergency shutdown flapper seats against. Since it was nothing but a flat plate with two rectagular holes in it I used a gasket for a pattern and made one. When I test ran the engine it would idle fine but acted like it was starving for something and wouldn't go above like 1500 RPM. Checked everything I could think to check both fuel and blower related, called everyone I knew that had ever laid a hand on a Detroit and couldn't figure out what was wrong. Finally took the intake housing off the side of the blower, to make sure the flap hadn't broke, etc and tested it with the housing off. Fired it up and it ran like a top. I knew the only thing I had done was to make that plate, so that had to be causing the problem. As I stood there contemplating the situation I remembered there was another engine behind the shop that might still have the OEM plate on it so I went and checked. Sure enough there was the plate I needed. Took it off and matched it up with the plate I made. Both holes in my plate were identical in size to the OEM plate so no problem there. The only difference was the holes in mine were located about 3/4 of an inch higher than the ones on the OEM plate. I held up both plates against the blowers opening and the holes in both plates were wide open into the blower so there was no restriction caused by the different hole position, and when held against the housing with the flap there was no restriction caused by anything there either. To this day no one I've talked to can eplain why the holes just being lower would make such a significant difference in the air flow when they were exactly the same size.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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