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At first I copied https://www.jetcat.de/en/productdetails/produkte/jetcat/produkte/hobby/Engines/P160_rxi_b

Where I manufactured and installed all the parts and they are very similar to the original product (also similar to the same quality of metal) I am facing two problems: The first: When the engine is running, the engine does not start properly (taking into account that the balance is not good because it contains vibration) and also makes a popping sound. enter image description here The second problem: Since the start of operation, the temperature begins to rise dramatically, which causes the turbine disc and the nozzle to redden, as it throws a large proportion of the fire outside the combustion chamber. Notes: The work circuit is manufactured and programmed manually by me: The kerosene pumping rate works with a continuous mechanism (I imitated the pumping algorithm in the main circuit) and I am not sure if I connected it correctly. After searching, I found that the fuel pumping algorithm should be used in particular, but I did not find sources to help me. Are there any suggestions to help me find solutions to my problems?

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    $\begingroup$ Are you asking engineering suggestions based on an engine picture? That said this is an impressive achievement. $\endgroup$
    – mins
    Jun 21 at 10:01
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    $\begingroup$ As it is, the way this question is asked is asking for opinions and much much too broad. Pick one of your issues (engine does not start properly, engine is not balanced, non-stable temperature, uncontrolled (or not properly controlled) fuel flow) and give us as much information as you are willing and ask a concrete and answerable with facts question on that single point. (and oh by the way, well done project, so far) $\endgroup$
    – CGCampbell
    Jun 21 at 11:32
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    $\begingroup$ I’m voting to close this question because it about home made version of a MODEL aircraft engine and has very little in common with actual aircraft engines. $\endgroup$ Jun 21 at 12:41
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    $\begingroup$ We have a SE just for that - drones.stackexchange.com - this would be a good question there, with more detail though. $\endgroup$
    – Therac
    Jun 21 at 12:54
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    $\begingroup$ It sorta looks like you are burning all the air going through the combustion can. Normal jet engines only burn a minor fraction of the through flow and use the rest to cool the engine and contain the flame within the combustion can. Is that what the Jet Cat does? $\endgroup$
    – John K
    Jun 21 at 14:01