Quote:
Originally Posted by DanEC
Is this just for headers build data or entire exhaust system? I'll take a chance it's for complete exhaust system as I have to figure out how to fit undercar exhaust and tailpipes on my ERA. I don't need to be trying to fit any larger dia. pipes under there than I have to.
bore size (4.145), crankshaft stroke (4.25), rod length (6.70), peak hp rpm (around 5300 to 5500 - very flat), comp ratio (9.0)
intake data : valve head diameter(2.09), valve lift (.563), dur. @ .050 (231), degreed centerline (108 intake cernter line), lca (lobe separation - 112)
exhaust data: valve head dia. (1.65), valve lift (.575), dur. @ .050. (236)
Thanks
Dan
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--- Single Primary Pipe Specs --- for 458.795 CID from 3400 to 5900 RPM
Diameter= 1.742 to 1.867 Length= 36.1 to 39.1 inches long
--- 2-Step Primary Pipe Specs ---
1st Dia. inches= 1.742 Length= 18.1 to 19.6
2nd Dia. inches= 1.867 Length= 18.1 to 19.6
--- 3-Step Primary Pipe Specs ---
1st Dia. inches= 1.742 Length= 18.1 to 19.6
2nd Dia. inches= 1.867 Length= 9.0 to 9.8
3rd Dia. inches= 1.992 Length= 9.0 to 9.8
--- Header Collector Specs (Conventional Straight Tube) ---
Diameter= 3.197 to 3.447 Tuned Lengths= 20.8 best and also 10.4 or 41.5
--- Header Collector Specs (Megaphone or Diffuser Cone Shape) ---
Diameter= 2.697 taper to 3.697 Megaphone/Diffuser Length= 20.8 inches
Best HP/TQ Tuned Collector Lengths= 20.8 , 41.5 , 83.0 , 166.1 inches long
Worst HP/TQ Loss Collector Lengths= 31.1 , 62.3 , 124.5 , 249.1 inches long
Note-> all Pipe Diameters are OD and based-off .0625 inch Pipe thickness
---- Primary Pipe's Harmonics ----
1st Harmonic = 157.1 inches long ... typically never used
2nd Harmonic = 59.9 inches long ... longest recommended
3rd Harmonic = 36.1 inches long ... highly recommended , best Torque Curve
4th Harmonic = 25.3 inches long ... shortest recommended
5th Harmonic = 19.2 inches long ... typically never used
6th Harmonic = 15.2 inches long ... typically never used
7th Harmonic = 12.5 inches long ... typically never used
8th Harmonic = 10.4 inches long ... typically never used
---- Collector's Harmonics (includes Intermediate, Muffler , TailPipe) ----
1st Harmonic = 166.1 inches long ... longest with Mufflers and TailPipes
2nd Harmonic = 83.0 inches long ... longest recommended with Mufflers
3rd Harmonic = 41.5 inches long ... more bottom-end Torque
4th Harmonic = 20.8 inches long ... highly recommended , best Torque Curve
5th Harmonic = 10.4 inches long ... reduced Torque , more top-end HP sometimes
6th Harmonic = 5.2 inches long ... reduced Torque , not recommended