Who is it safe to buy TBs from now?
02-19-2005, 07:24 AM
#121
Let me take a stab at explaining how porting the throttle body does in fact increase flow. Keep in mind that I have experience designing piping system and ducting systems in for both liquid and air systems. Lets start with the fact that all of the components of the intake system cause a pressure drop, the air cleaner, lid, maf etc. Some cause a higher pressure drop then others. When the air flows across the filter it suffers a pressure drop resulting in a loss of velocity and total flow. After the air charge goes through the maf it will again suffer a pressure drop. and it will continue to suffer pressure drops at other restriction, TB, intake, valves etc. another key point is that the greater the velocity the greater the pressure drop of each of the restrictive components. This is why a big cube car responds better to the fast intake system then a small cube car. Another key point to consider is not just the diameter of the restriction but the length of the restriction. Take the maf, its about 5" long if it was 3' long the the amount of pressure drop would be much greater. The bottom line is the velocity of the air is depleted with each restriction. The greater the total number of restrictions and the intesity of them the greater the total effect on the engines volumetric efficiency. Not trying to start an argument but these are basic engineering facts not opinions.
02-19-2005, 08:51 AM
#122
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Originally Posted by koolrayz
Let me take a stab at explaining how porting the throttle body does in fact increase flow. Keep in mind that I have experience designing piping system and ducting systems in for both liquid and air systems. Lets start with the fact that all of the components of the intake system cause a pressure drop, the air cleaner, lid, maf etc. Some cause a higher pressure drop then others. When the air flows across the filter it suffers a pressure drop resulting in a loss of velocity and total flow. After the air charge goes through the maf it will again suffer a pressure drop. and it will continue to suffer pressure drops at other restriction, TB, intake, valves etc. another key point is that the greater the velocity the greater the pressure drop of each of the restrictive components. This is why a big cube car responds better to the fast intake system then a small cube car. Another key point to consider is not just the diameter of the restriction but the length of the restriction. Take the maf, its about 5" long if it was 3' long the the amount of pressure drop would be much greater. The bottom line is the velocity of the air is depleted with each restriction. The greater the total number of restrictions and the intesity of them the greater the total effect on the engines volumetric efficiency. Not trying to start an argument but these are basic engineering facts not opinions.
