[EMAIL PROTECTED] wrote: > > I have a question on the stromberg carb. Have a 1946 415C-D with a C-85 > and a stromberg carb. Engine really hesitates and stumbles on > acceleration when throttle is advanced. Throttle has to be advanced > extremely slowly to avoid this, but it runs great once it catches. Any > ideas? I realize it doesn't have an accelerator pump, but could there be > something with the float setting or mixture? Also, mixture does not work > to kill engine at idle, only at higher power. Is this normal? Carb. was > supposedly rebuilt two years ago, but have no idea what was done. Also > has been running autogas. Thanks for your time. > Tracy McPherson
As others have said, the Stromberg carb has no accelerator pump nor any idle cut-off. As I fly, up at altitude, I occasionally do low power let downs (instead of my normal cruise descents). I slowly pull back power and cool the engine over a several (3-10 minute) period to avoid shock cooling as I pull it back to idle. During the descent, per the old timers recommendations, I occasionally "clear her throat" by advancing the throttle. When I do this, I make it a practice session for emergency throttle advance. >From zero to full power, I count seconds. It takes about three seconds to get from zero to full on my plane with FULL ASSURANCE that there'll be no stumbling of the engine. If you over do it and the engine stumbles, no big deal, just pull the throttle back and advance it again more slowly. Good words to live by in flying are: Your mileage may vary! Test it. Practice it. Get used to it. Make it so practiced that, in an emergency, you don't even need to think about it to get it right. Make your decisions ahead of time as much as possible. Think out the options and plan and discuss your responses. Did you know you can cut down your reaction time to 1/3 rd of normal by having the basic decisions pre-made? When you approach a situation with a threat, bring to mind and keep in the back of your mind the options you've thought out. How's that for a long way to say, "Practice going from zero to full throttle a few times before you need it." [When I get on a roll, I just can't stop. It sure gets the discussions going.] As to the idle cut-off, I'm a little surprised you can get a Stromberg to cut off the engine at any rpm. It certainly shouldn't do it at idle -- it wasn't designed to do so. That's why so many Coupers have more confidence in their P-leads than other pilots -- we test them at every engine shut down by turning the key to turn off the engine. (Yeah, I know some of you die-hards shut off the engine by shutting off the fuel valve. That's another discussion.) -- Ed Burkhead Peoria, Ill. Ercoupe N3802H, 415-D Never open an attachment with a ".exe" or ".com" or ".vbm" suffix. To be safe, turn off Microsoft's Visual Basic Macro execution option. Consider not using Outlook for mail - lots of viruses target its security flaws. __________________________________________________________________________ ______ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] ___________________________________________________________ T O P I C A The Email You Want. http://www.topica.com/t/16 Newsletters, Tips and Discussions on Your Favorite Topics
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