The Stromberg on my 'Coupe is ineffective and inoperative on the ground between 300 and 1200 RPM (field elevation is 5,000 ft.). If I pull it all the way out at idle, the engine doesn't start missing during run-up until 1200 RPM and then runs rough. Push it in, the engine runs smooth. In the air from 7,000 feet and higher the engine begins to miss and drop RPM with the slightest pull on the mixture control, even pulling it out 1/8th inch. Too touchy at altitude to really be able to make an adjustment. Just had mine annualed too. Compression was 78/80, 78/80, 78/80, 76/80. The plugs were bone dry but had lots of black carbon, like you describe. I complained to my A&P and he just said to live with it because that's the nature of the old Stromberg. I hope this isn't true and someone out there has a "cure". Most pilots I talk to who have the Stromberg say the same thing my mechanic told me. Hope it isn't so. Most say you have to switch to the other brand of carb to get effective mixture control, plus it has an internal pump that instantly shoots fuel when you open the throttle, thus eliminating the Stromberg Stumble on take-off. -----Original Message----- From: [EMAIL PROTECTED] <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]> Date: Saturday, November 07, 1998 2:03 PM Subject: Stromberg Carb Problem.
>Hello all: >The mixture control on my 85 hp coupe has no obvious effect. The previous >owner told me that unless you turned off the ignition the engine wouldn't die >and it had been that way for years.... (hmmmmm) . After about 35 hrs of run >time since the last annual it started to run a little rough. I pulled the >plugs and all were quite carboned up indicating a too rich run. Can anyone >tell me how their mixture control works, is mine normal or worn out, and if >the latter, who rebuilds Stromberg carbs >or is there a newer substitute. Costs???? Advice appreciated. >Rob Talbot-Jones
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