Header Tube and Collector Specs "Trends"
Exhaust Gas Temperature ( EGT )
has a huge overall effect on the entire Exhaust System !
EGT sets up the Speed of Sound FPS + temperature gradient thru the entire Exhaust System !
Compression Ratio effects
Low Compression Ratios : ( High EGT's )
= Larger Tube + Collectors , and Longer Tubes + Collector lengths
High Compression Ratios : ( Low EGT's )
= Smaller Tube + Collectors , and Shorter Tubes + Collector lengths
Fuel Effects
Gasoline -vs- Methanol
Gasoline will have higher EGT temps than Methanol
so that Gasoline Engine will have slightly larger Tube + Collector diameters
and slightly longer Tubes + Collector lengths -vs- Methanol Fuel
EGT Effects
Low EGT's :
= Smaller Tube + Collectors , and Shorter Tubes + Collector lengths
High EGT's :
= Larger Tube + Collectors , and Longer Tubes + Collector lengths
other Effects are :
Header / Exhaust System Coatings, Tube Material, Wraps, Tube thickness
Header Tube and Collector Specs "Trends"
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Re: Header Tube and Collector Specs "Trends"
Header Tube Lengths "Trends" :
The earlier the exhaust valve opens .... then the longer the Primary Tube length
-vice/versa
The later the exhaust valve opens .... then the shorter the Primary Tube length
.... reasons : you are trying to "Time" the negative pressure Wave to occur approx. centered on TDC-Overlap Period
PipeMax v4.50 additional Header Specs Help screenshot :
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Re: Header Tube and Collector Specs "Trends"
the EGT is the System's Speed ( Speed of Sound FPS ) you have to work with,
and the "Timing" of the returning negative pressure Wave @ TDC-Overlap is where huge amount of TQ and HP gains are ,
so the earlier EVO event is ... the longer the Primary Tubes need to be .
a "Hunting analogy" :
the faster the Duck flies ... the more you lead the shot with your Shot Gun
so basically ...
if you shoot too soon , you don't hit the Duck ( TDC-Overlap )
if you shoot too late, you don't hit the Duck either !
if you shoot at the correct time , you hit the Duck , and win the TQ and HP prize !
and the "Timing" of the returning negative pressure Wave @ TDC-Overlap is where huge amount of TQ and HP gains are ,
so the earlier EVO event is ... the longer the Primary Tubes need to be .
a "Hunting analogy" :
the faster the Duck flies ... the more you lead the shot with your Shot Gun
so basically ...
if you shoot too soon , you don't hit the Duck ( TDC-Overlap )
if you shoot too late, you don't hit the Duck either !
if you shoot at the correct time , you hit the Duck , and win the TQ and HP prize !