I get lots of questions on if MPFI (MULTI PORT FUEL INJECTION) or CARBS or TB (THROTTLE BODY) injection is better,SO I figure ID post a very brief explanation and info links,on how each system basically functions ,most fuel current injection systems but NOT all of them use direct port injection,and a fuel pressure return regulator with a return line and most of those current systems use a fuel pressure of at least 35 psi-40psi which the standard carb fuel pump with its 6-7 psi won,t supply
theres some TB injection systems that work on much less fuel pressure but in most cases still will above the 6-7 psi level.
bits of INFO
carbs
http://auto.howstuffworks.com/question377.htm
http://www.roadkill.com/~davet/moto/carb.monologue.html
http://popularhotrodding.automotive.com/60684/0802phr-how-carburetors-work/index.html
TBI
http://autorepair.about.com/cs/generalinfo/l/bldef_791.htm
http://www.goingfaster.com/spo/tbi.html
MPFI
http://www.youtube.com/watch?v=ufsOIOQmFHc
http://auto.howstuffworks.com/fuel-injection.htm
http://www.autoshop101.com/forms/h20.pdf
http://www.customefis.com/GMEFI.html
http://www.holley.com/data/Products/Technical/199R10179-2.pdf
http://www.popularhotrodding.com/enginemasters/articles/hardcore/0305em_holley/index.html
http://www.holley.com/91503201.asp
viewtopic.php?f=55&t=635
http://static.summitracing.com/global/i ... -13301.pdf
places with more info
http://www.fuelinjectionent.com/
most people don,t understand that the return fuel line to the tank will ideally have very low restriction to flow for the fuel pressure regulator to function correctly, if theres a restriction to flow it reduces the bye pass fuel pressure regulators accuracy and consistency.
most guys use a smaller diam. return line thinking that theres less fuel flow due to the engine use of fuel, thats not generally 100% accurate because if the fuel pressure is to remain consistent at a set pressure & volume the fuel pump must produce more fuel pressure and flow volume even at peak rpms than the engine can burn and even under high (G) loads, meaning that the return line needs to be fairly large and unrestricted to reduce the resistance, to flow in the upper rpm ranges with manual pumps that work in relation to engine rpms and all the time with electric pumps
theres some TB injection systems that work on much less fuel pressure but in most cases still will above the 6-7 psi level.
bits of INFO
carbs
http://auto.howstuffworks.com/question377.htm
http://www.roadkill.com/~davet/moto/carb.monologue.html
http://popularhotrodding.automotive.com/60684/0802phr-how-carburetors-work/index.html
TBI
http://autorepair.about.com/cs/generalinfo/l/bldef_791.htm
http://www.goingfaster.com/spo/tbi.html
MPFI
http://www.youtube.com/watch?v=ufsOIOQmFHc
http://auto.howstuffworks.com/fuel-injection.htm
http://www.autoshop101.com/forms/h20.pdf
http://www.customefis.com/GMEFI.html
http://www.holley.com/data/Products/Technical/199R10179-2.pdf
http://www.popularhotrodding.com/enginemasters/articles/hardcore/0305em_holley/index.html
http://www.holley.com/91503201.asp
viewtopic.php?f=55&t=635
http://static.summitracing.com/global/i ... -13301.pdf
places with more info
http://www.fuelinjectionent.com/
most people don,t understand that the return fuel line to the tank will ideally have very low restriction to flow for the fuel pressure regulator to function correctly, if theres a restriction to flow it reduces the bye pass fuel pressure regulators accuracy and consistency.
most guys use a smaller diam. return line thinking that theres less fuel flow due to the engine use of fuel, thats not generally 100% accurate because if the fuel pressure is to remain consistent at a set pressure & volume the fuel pump must produce more fuel pressure and flow volume even at peak rpms than the engine can burn and even under high (G) loads, meaning that the return line needs to be fairly large and unrestricted to reduce the resistance, to flow in the upper rpm ranges with manual pumps that work in relation to engine rpms and all the time with electric pumps