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Hi Karol,Any chance of posting an introduction to yourself and your modelling interests in the introduction section?It will let the other members get to know you and they may be able to help you in the future .Jo
Tuned pipe pressure to the tank has been the standard in glow ignition engines for a long time. Crankcase pressure has also been used, most successfully with a pressure regulator. The use in a gasoline fueled engine is a lot less common due to the readily available carbs like the Walbro. However, at high rpm the pumper carbs can't keep up. We have had consistent problems in our straight line record engines that turn over 20,000 rpm. Jim's "simple" system avoids this issue and feeds fuel proportionally with the pipe pressure. Pipe pressure is related to power, so in the system can be adjusted to work well. However, it's not as fool proof as the pumper carbs for low performance, industrial engine use.Lohring Miller