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Model Forum / Radio Controlled / Land Models / January 2006just the right mixture?
How can I tell if I have the mixture just right? I read about getting the temp. just right, but I dont have one of those high tech temp gauge, so I trying to do it by jugdement.. I'm guessing that I'm still a little rich, due to the fact that I'm getting a oily residue on the pipe side of the body and the left rear tire.. Any suggestion? Jason Inline............. > How can I tell if I have the mixture just right? Assuming it's a two-needle carb: HSN--> At full throttle, maximum RPM you should have a nice smoke trail. No smoke = too lean. LSN--> After it's warmed up, let it sit for five seconds and then mash the throttle. If it takes off like it's been shot in the a.s, LSN is correct. If it's slow and boggy it's too rich, if it takes off then sputters and loses power it's too lean. > I read about getting the temp. just right, but I dont have one of those > high tech temp gauge, so I trying to do it by jugdement.. I'm guessing > that I'm still a little rich, due to the fact that I'm getting a oily > residue on the pipe side of the body and the left rear tire.. Oily residue doesn't mean it's rich. My Savage and Mayhem are both set "lean and mean" and I still get gobs of oil everywhere! A temp gauge is a great tool to have, but you can tune by sight, sound and feel just as good without one. I use my temp gauges more to monitor temp so I don't overheat and grenade than as a tuning aid. > Any suggestion? If it's running good, leave it be. If you want to lean, just do it in little increments (like 1/8-1/4 turn at a time) and see what happens. As long as you have smoke you're in good shape. Doc > Inline............. > [quoted text clipped - 4 lines] > HSN--> At full throttle, maximum RPM you should have a nice smoke trail. > No smoke = too lean. Or if it just dies at massive revs *cough* - that's quite bad for them... > LSN--> After it's warmed up, let it sit for five seconds and then mash > the throttle. If it takes off like it's been shot in the a.s, LSN is > correct. If it's slow and boggy it's too rich, if it takes off then > sputters and loses power it's too lean. Yup, what he said :-) I'd make a few other comments but i'm far too hungover right now - Doc covered it all anyway!  SignatureDan - somehow expected to attend a lecture in 14 minutes... >> Inline............. >> [quoted text clipped - 14 lines] > Yup, what he said :-) I'd make a few other comments but i'm far too > hungover right now - Doc covered it all anyway! He he he, I was a bit blasted last night myself and cut my response short as well. I was going to elaborate on temp gauges: In my experience a nitro engine will usually overheat +300*F before the smoke trail disappears. I use my temp gauge to monitor overall engine temp when running, but when tuning, it's a good barometer for tuning the HSN. If you're under 300* and have smoke you're in good shape. Tuning to achieve a certain temp isn't the greatest idea as the motors will run different temps in different conditions (cold, humid, hot, dry, etc.). For example, my Mayhem ST runs around 280* religiously in the summer months, wheras right now in the winter months she's running about 210*. If I were to lean out the HSN to achieve the 280* mark I'd blow the engine. Temp guages are also good to try different fuels. You can compare performance vs. temp and see what fuel provides the best performance at the lowest temp. HTH, Doc >>> Inline............. >>> [quoted text clipped - 35 lines] > > HTH, Drunk again. Listen to Doc. He know'what he be doing. SignatureDan |
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