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Okie dokie, since I have the carb off N43319, just want to confirm a few things. Last fall I researched the heck out of this, after consulting my spec sheets, manuals, online sources etc. etc. I had everything written down and now can't find my notes at the hangar.
We were going through my brother's Pober (also has an A-75)...I had an extra carb that had been gone through, sealed up and put away that was jetted and venturied for an 85. I have a big box of carb stuff so we changed the venturi, jet and air bleed to the proper ones. Everything I found directed using the same bits as an A-65 for the A-75. If memory serves correctly I'm referring to a 1 1/4" venturi, a No. 49 metering jet, and No. 65 bleed air. That's how we set it up.
Now, a couple of days ago I was visiting a few "old timers" at another aerofield...these guys have an awful lot of wrench and stick time and they are reasonably intact bodily, always a good sign. During our discussion all three concurred that the "A" series book is incorrect and that you need to use the Stromberg specs for the [B]C-75[B] when setting up a Stromberg for the A-75. When I mentioned that seemed a wee bit off since the C-75 is a very different engine of larger displacement, their reply focused on me going to get them more donuts since I had questioned their vast mental database of aeronautical knowledge.
So...I thought I'd again go to the well of T-craft lore and ask here. I have 1 1/4", 1 5/16" and 1 3/8" venturis, different jets, etc., so my options are available... I can remember a few other sources I found regarding "using the "C-75" specs as correct for the "A-75" last year. As always, all comments, laughter, derision, etc. are welcome.
We were going through my brother's Pober (also has an A-75)...I had an extra carb that had been gone through, sealed up and put away that was jetted and venturied for an 85. I have a big box of carb stuff so we changed the venturi, jet and air bleed to the proper ones. Everything I found directed using the same bits as an A-65 for the A-75. If memory serves correctly I'm referring to a 1 1/4" venturi, a No. 49 metering jet, and No. 65 bleed air. That's how we set it up.
Now, a couple of days ago I was visiting a few "old timers" at another aerofield...these guys have an awful lot of wrench and stick time and they are reasonably intact bodily, always a good sign. During our discussion all three concurred that the "A" series book is incorrect and that you need to use the Stromberg specs for the [B]C-75[B] when setting up a Stromberg for the A-75. When I mentioned that seemed a wee bit off since the C-75 is a very different engine of larger displacement, their reply focused on me going to get them more donuts since I had questioned their vast mental database of aeronautical knowledge.
So...I thought I'd again go to the well of T-craft lore and ask here. I have 1 1/4", 1 5/16" and 1 3/8" venturis, different jets, etc., so my options are available... I can remember a few other sources I found regarding "using the "C-75" specs as correct for the "A-75" last year. As always, all comments, laughter, derision, etc. are welcome.
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