Aces High Bulletin Board
General Forums => Aircraft and Vehicles => Topic started by: Skyguns MKII on April 14, 2014, 11:50:29 PM
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On the last quiz we discussed about upper deck and lower deck pressure on the intake system of a turbocharged engine. Now here's something a little more challenging :banana:... What is the relationship between a fuel injector nozzle and upper and lower deck pressure? which deck pressure is it usually located in? and why? Good luck! :cheers:
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On the last quiz we discussed about upper deck and lower deck pressure on the intake system of a turbocharged engine. Now here's something a little more challenging :banana:... What is the relationship between a fuel injector nozzle and upper and lower deck pressure? which deck pressure is it usually located in? and why? Good luck! :cheers:
:banana: Good question! However, I believe, if memory serves me correctly, a fuel injection system, direct into the cylinders, has a metering device, not a carburetor, so the upper and lower deck pressures would be not be a factor. Example, on a Cessna 421 with TSIO-540 engines, if the blowers were hardy enough, you could climb much higher than the service ceiling listed in the POH, but the limiting factor is now the amount of air which can be introduced into the cylinders.
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:banana: Good question! However, I believe, if memory serves me correctly, a fuel injection system, direct into the cylinders, has a metering device, not a carburetor, so the upper and lower deck pressures would be not be a factor. Example, on a Cessna 421 with TSIO-540 engines, if the blowers were hardy enough, you could climb much higher than the service ceiling listed in the POH, but the limiting factor is now the amount of air which can be introduced into the cylinders.
ah very good! however! notice i said fuel injection system. I didn't mention if it was direct injection OR :old: CONTINUOUS fuel injection hint! hint! :bolt:
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ah very good! however! notice i said fuel injection system. I didn't mention if it was direct injection OR :old: CONTINUOUS fuel injection hint! hint! :bolt:
:uhoh Sorry, this old mind not working like it used to! Still having trouble grasping the heart of the question. "Float" type carbs must be involoved with the question, but not sure how you want answer presented. Help us out on this one, darn good question and subject though!
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:uhoh Sorry, this old mind not working like it used to! Still having trouble grasping the heart of the question. "Float" type carbs must be involoved with the question, but not sure how you want answer presented. Help us out on this one, darn good question and subject though!
not a float type carburetor. Dont wanna give it all away! :cheers:
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A port fuel injector is located in the lower deck or downstream of the throttle plate.
A "pressure carb" or "injection carb" as used in a merlin is upstream of even the blower inlet.
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A port fuel injector is located in the lower deck or downstream of the throttle plate.
A "pressure carb" or "injection carb" as used in a merlin is upstream of even the blower inlet.
Correct! next one coming soon!