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| Gas Engines and Power Discuss all aspects of giant scale power systems |
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| | #61 (permalink) | ||||||||||||||||||
| Uber Contributer ![]() Join Date: Apr 2007 Location: Bedford Texas
Posts: 193
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ANYTIME your engine changes in how it starts IE: just like you describbed, there's a problem lurking within your carb. The most common problem is the internal filter screen. Remove it, clean it, or replace it. Also, check the float diaphragm. If its stiff OR if its wavy looking, replace it too. | ||||||||||||||||||
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| | #62 (permalink) | ||||||||||||||||||
| Uber Contributer ![]() Join Date: Apr 2007 Location: Bedford Texas
Posts: 193
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Glow engine carbs are muffler pressure/gravity fed. Your carb is pump driven. You need to remove all GLOW FUEL methodology from your thinking. Especially regarding tuning... | ||||||||||||||||||
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| | #63 (permalink) | ||||||||||||||||||
| Uber Contributer ![]() Join Date: Apr 2007 Location: Bedford Texas
Posts: 193
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It's best to set the topend first. Start your engine, let it warm up. Transition to full throttle. Adjust the HIGHEND NEEDLE to peak RPM. Then, SLOWLY throttle back until the engine begins to FOUR STROKE. At the point, adjust the LOWEND needle until the FOUR STROKING stops. Pull the throttle down more until it FOUR STROKES again and repeat this until you reach full IDLE. NOW, transition up rapidly. IF it sags or bogs, open the LOWEND needle SLIGHTLY until the sagging is gone... YOU"RE DONE! One big MISTAKE people make (when they tune up a gasser) is to peak the engine then back off the needle to richen it up slightly just like a glow fuel engine. DO NOT DO THAT! Once your carb is properly tuned to peak it will maintain the CORRECT air to fuel balance. Richening it up only causes the engine to run wet and inefficient. IF you are not sure if you have a good tune, look inside your muffler or pull your spark plug. It'll tell you real quick. If it's black & wet its time to re-do your tune. | ||||||||||||||||||
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| | #64 (permalink) | ||||||||||||||||||
| Thread Killer ![]() Join Date: Nov 2006 Location: edmonton,alberta,canada
Posts: 237
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| | #65 (permalink) |
| Uber Contributer ![]() Join Date: Apr 2007 Location: Bedford Texas
Posts: 193
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Sired by Fire, Nope, LOWEND needle. Anytime you transition off of idle and it sags, the lowend is lean. The highend setting doesn't kick in until your engine hits a good 3500 RPM or more. |
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| | #66 (permalink) |
| Bad-ass Super Contributer! ![]() Join Date: Jan 2006 Location: Lakeview, AR Age: 31
Posts: 833
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So what is a good head temp?
__________________ Pro1Foam@flyinggiants.com ![]() http://www.upstreamadventures.org http://www.whiteriversportflyers.com N687SC |
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| | #67 (permalink) | ||||||||||||||||||
| Uber Contributer ![]() Join Date: Apr 2007 Location: Bedford Texas
Posts: 193
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| | #68 (permalink) |
| Bad-ass Super Contributer! ![]() Join Date: Jan 2006 Location: Lakeview, AR Age: 31
Posts: 833
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Any tips on telling if you high end is to lean other than a white plug?
__________________ Pro1Foam@flyinggiants.com ![]() http://www.upstreamadventures.org http://www.whiteriversportflyers.com N687SC |
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| | #69 (permalink) | ||||||||||||||||||
| Uber Contributer ![]() Join Date: Apr 2007 Location: Bedford Texas
Posts: 193
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If it's too lean your RPM goes down and it runs hotter than normal. If it's too rich your RPM goes down and it runs cooler than normal. But you have to know what "normal" is. I recommend you peak it using a Tach, and leave well enough alone. | ||||||||||||||||||
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| | #70 (permalink) |
| Bad-ass Super Contributer! ![]() Join Date: Jan 2006 Location: Lakeview, AR Age: 31
Posts: 833
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peak and back off a hundred rpm? I think thats what you said in the artical.
__________________ Pro1Foam@flyinggiants.com ![]() http://www.upstreamadventures.org http://www.whiteriversportflyers.com N687SC |
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| | #71 (permalink) | ||||||||||||||||||
| Gettin' Lower! ![]() Join Date: Jan 2006 Age: 55
Posts: 64
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