honda prostock 2.6L 4cyl
Postat: sön okt 12, 2008 12:40 pm
i nyaste engine master tidningen har de lite info och bilder på en honda prostock K20/K24 serie motor på 2.593L tänkte att jag lägger upp lite info sen snackar vi lite om den.
jag har en del intresanta funderigar, men vi tar de senare vad tror ni om bas motor uppsettningen?
lite bas fakta om motorn, den har...
89.5mm borr
103mm slag
36x30 ventiler med dryga 350cfm flöde in
en kam med 270/272 0.05" dur och lyft på 0.550/0.510
ett steppat 1 7/8-2" 4:1 grenrör med merage colektor (ingen längd står specat).
race bensin, 760cc cpridare AEM styrning.
effekt
5000/ 259hk
6000/331hk/290lb
7000/381hk
8000/402hk/264lb
max rpm vid race 10000 med 103mm slag
jag slog in lite data i pipe max
57.844 Cubic Inches @ 8000 RPM with 127.0 % Volumetric Efficiency PerCent
Required Intake Flow between 317.7 CFM and 336.5 CFM at 28 Inches
Required Exhaust Flow between 242.4 CFM and 264.5 CFM at 28 Inches
600 RPM/Sec Dyno Test Lowest Low Average Best
Peak HorsePower 373.0 388.4 396.0 403.7
Peak Torque Lbs-Ft 260.1 270.8 276.2 281.5
HorsePower per CID 2.363 2.460 2.509 2.558
Torque per Cubic Inch 1.648 1.716 1.750 1.783
BMEP in psi 248.5 258.7 263.8 269.0
Carb CFM at 1.5 in Hg. 464 516 542 569
Target EGT= 1084 degrees F at end of 4 second 600 RPM/Sec Dyno accel. test
Octane (R+M)/2 Method = 116.0 to 114.6 Octane required range
Air Standard Efficiency = 66.51319 % for 14.800:1 Compression Ratio
Peak HorsePower calculated from Cylinder Head Flow CFM only
600 RPM/Sec Dyno Test Lowest Average Best Potential
Head Flow Peak HP = 367.8 387.2 406.6
----- Engine Design Specifications -----
( English Units ) ( per each Valve Sq.Inch area )
Engine Size CID = 157.844 Intake Valve Net Area = 1.533
CID per Cylinder = 39.461 Intake Valve Dia. Area = 1.577
Rod/Stroke Ratio = 1.480 Intake Valve Stem Area = 0.044
Bore/Stroke Ratio = 0.868 Exhaust Valve Net Area = 1.050
Int Valve/Bore Ratio = 0.805 Exhaust Valve Dia. Area = 1.094
Exh Valve/Bore Ratio = 0.670 Exhaust Valve Stem Area = 0.044
Exh/Int Valve Ratio = 0.833 Exh/Int Valve Area Ratio = 0.693
Intake Valve L/D Ratio= .388 Exhaust Valve L/D Ratio= .432
CFM/Sq.Inch = 100.7 to 106.7 CFM/Sq.Inch =110.8 to 121.0
Curtain Area -to- Valve Area Convergence Intake Valve Lift inch= .354
Curtain Area -to- Valve Area Convergence Exhaust Valve Lift inch= .295
Intake Valve Margin CC's Exhaust Valve Margin CC's
1.00 CC = 0.0387 1.00 CC = 0.0558
0.50 CC = 0.0193 0.50 CC = 0.0279
0.25 CC = 0.0097 0.25 CC = 0.0140
0.10 CC = 0.0039 0.10 CC = 0.0056
------- Piston Motion Data -------
Average Piston Speed (FPM)= 5406.66 in Feet Per Minute
Maximum Piston Speed (FPM)= 8969.46 occurs at 72.996 Degrees ATDC
Piston Depth at 72.996 degree ATDC= 1.7565 inches Cylinder Volume= 280.1 CC
Maximum TDC Rod Tension GForce= 4931.01 G's
Maximum BDC Rod Compression GForce= 2440.16 G's
------- Current Camshaft Specs @ .050 -------
IntOpen= 25.00 IntClose= 65.00 ExhOpen= 66.00 ExhClose= 26.00
Intake Duration @ .050 = 270.00 Exhaust Duration @ .050 = 272.00
Intake CenterLine = 110.00 Exhaust CenterLine = 110.00
Compression Duration= 115.00 Power Duration = 114.00
OverLap Duration = 51.00 Lobe Center Angle (LCA)= 110.00
Camshaft installed Straight Up = 0.00 degrees
-Recommended Camshaft Valve Lift-
Minimum Normal Maximum
Intake = 0.446 0.481 0.529
Exhaust = 0.405 0.436 0.479
Max-effort Intake Lift = 0.554
Max-effort Exhaust Lift = 0.502
Minimum Intake Valve Lift to prevent Choke = .481 Lift @ 8000 RPM
Minimum Exhaust Valve Lift to prevent Choke = .436 Lift @ 8000 RPM
- Induction System Tuned Lengths - ( Cylinder Head Port + Manifold Runner )
1st Harmonic= 30.326 (usually this Length is never used)
2nd Harmonic= 17.212 (some Sprint Engines and Factory OEM's w/Injectors)
3rd Harmonic= 12.016 (ProStock or Comp SheetMetal Intake)
4th Harmonic= 9.458 (Single-plane Intakes , less Torque)
5th Harmonic= 7.674 (Torque is reduced, even though Tuned Length)
6th Harmonic= 6.456 (Torque is reduced, even though Tuned Length)
7th Harmonic= 5.572 (Torque is greatly reduced, even though Tuned Length)
8th Harmonic= 4.901 (Torque is greatly reduced, even though Tuned Length)
Note> 2nd and 3rd Harmonics typically create the most Peak Torque
4th Harmonic is used to package Induction System underneath Hood
Plenum Runner Minimum Recommended Entry Area = 3.389 to 3.812 Sq.Inch
Plenum Runner Average Recommended Entry Area = 3.896 Sq.Inch
Plenum Runner Maximum Recommended Entry Area = 3.980 to 4.709 Sq.Inch
Minimum Plenum Volume CC = 482.8 [typically for Single-Plane Intakes]
Minimum Plenum Volume CID= 29.5 [typically for Single-Plane Intakes]
Maximum Plenum Volume CC = 2586.6 [typically for Tunnel Ram Intakes]
Maximum Plenum Volume CID= 157.8 [typically for Tunnel Ram Intakes]
------- Operating RPM Ranges of various Components -------
Camshaft Intake Lobe RPM = 13157 Exhaust Lobe RPM = 13013
Camshaft's Intake and Exhaust Lobes operating RPM range = 11121 to 13121
Note=> Lobe RPMs are only BallPark estimations
Minimum Intake Valve Lift to prevent Choke = .481 Lift @ 8000 RPM
Minimum Exhaust Valve Lift to prevent Choke = .436 Lift @ 8000 RPM
Current (Intake Valve Curtain Area -VS- Time) Choke RPM = 9154 RPM
Current (Exhaust Valve Curtain Area -VS- Time) Choke RPM = 9364 RPM
Intake Valve Area + Curtain Area operating RPM Range = 8457 to 10457 RPM
Intake Valve Diameter RPM Range = 7154 to 9154
Intake Flow CFM @28in RPM Range = 6525 to 8525
___________________________________________________________________________
Best estimate RPM operating range from all Components = 6866 to 8866
Note=>The BEST Engine Combo will have all Component's RPM Ranges coinciding
___________________________________________________________________________
--- Cross-Sectional Areas at various Intake Port Velocities (@ 28 in.) ---
156 FPS at Intake Valve Curtain Area= 4.897 sq.in. at .550 Lift
242 FPS at Intake Valve OD Area and at Convergence Lift = .354
298 FPS 90% PerCent Rule Seat-Throat Velocity CSA= 2.555 sq.in. at 8000 RPM
350 FPS Velocity CSA= 2.177 sq.in. at 8000 RPM Port Sonic-Choke with HP Loss
330 FPS Velocity CSA= 2.310 sq.in. at 8000 RPM Port Sonic-Choke with HP Loss
311 FPS Velocity CSA= 2.452 sq.in. at 8000 RPM Smallest Useable Port CSA
300 FPS Velocity CSA= 2.541 sq.in. at 8000 RPM Recommended Smallest Port CSA
285 FPS Velocity CSA= 2.675 sq.in. at 8000 RPM Recommended Smallest Port CSA
260 FPS Velocity CSA= 2.932 sq.in. at 8000 RPM Recommended Port CSA
250 FPS Velocity CSA= 3.050 sq.in. at 8000 RPM Recommended Port CSA
240 FPS Velocity CSA= 3.177 sq.in. at 8000 RPM Largest Intake Port Entry CSA
220 FPS Velocity CSA= 3.466 sq.in. at 8000 RPM Largest Intake Port Entry CSA
210 FPS Velocity CSA= 3.631 sq.in. at 8000 RPM Torque Loss + Reversion
200 FPS Velocity CSA= 3.812 sq.in. at 8000 RPM Torque Loss + Reversion
--- Cross-Sectional Areas at various Exhaust Port Velocities (@ 28 in.) ---
161 FPS at Exhaust Valve Curtain Area= 3.781 sq.in. at .510 Lift
278 FPS at Exhaust Valve OD Area and at Convergence Lift = .295
343 FPS 90% PerCent Rule Seat-Throat Velocity CSA= 1.772 sq.in. at 8000 RPM
435 FPS Velocity CSA= 1.399 sq.in. at 8000 RPM Sonic Choke at Throat Area
350 FPS Velocity CSA= 1.737 sq.in. at 8000 RPM Port Sonic-Choke with HP Loss
330 FPS Velocity CSA= 1.844 sq.in. at 8000 RPM Port Sonic-Choke with HP Loss
311 FPS Velocity CSA= 1.956 sq.in. at 8000 RPM Smallest Useable Port CSA
300 FPS Velocity CSA= 2.028 sq.in. at 8000 RPM Recommended Smallest Port CSA
285 FPS Velocity CSA= 2.135 sq.in. at 8000 RPM Recommended Smallest Port CSA
250 FPS Velocity CSA= 2.433 sq.in. at 8000 RPM Recommended Port CSA
240 FPS Velocity CSA= 2.535 sq.in. at 8000 RPM Recommended Port CSA
225 FPS Velocity CSA= 2.704 sq.in. at 8000 RPM Largest Exhaust Port Exit CSA
210 FPS Velocity CSA= 2.897 sq.in. at 8000 RPM Largest Exhaust Port Exit CSA
190 FPS Velocity CSA= 3.202 sq.in. at 8000 RPM Torque Loss + Reversion
180 FPS Velocity CSA= 3.380 sq.in. at 8000 RPM Torque Loss + Reversion
---- Some Useful Formulas are: ----
Average_CSA = Port_Volume_CC / (Port_CenterLine_Length * 16.387)
Port_Volume_CC = Average_CSA * Port_CenterLine_Length * 16.387
Port_CenterLine_Length = Port_Volume_CC / ( Average_CSA *16.387 )
FPS = ( Flow_CFM * 2.4 ) / Average_CSA
Flow_CFM = Average_CSA * FPS * .4166667
Average_CSA = ( Flow_CFM * 2.4) / FPS
Valve Intake Exhaust Curtain Area 300 FPS Velocity Minimum Head
Lift Choke Choke Square Inches Cross-Sect Area Flow @ 28 In
inches RPM RPM Intake Exhaust Intake Exhaust Int Exh
.050 832 918 0.445 0.371 0.264 0.211 33.0 26.4
.075 1248 1377 0.668 0.556 0.397 0.316 49.6 39.6
.100 1664 1836 0.890 0.741 0.529 0.422 66.1 52.7
.125 2080 2295 1.113 0.927 0.661 0.527 82.6 65.9
.150 2496 2754 1.335 1.112 0.793 0.633 99.1 79.1
.175 2913 3213 1.558 1.297 0.925 0.738 115.7 92.3
.200 3329 3672 1.781 1.483 1.057 0.844 132.2 105.5
.225 3745 4131 2.003 1.668 1.190 0.949 148.7 118.7
.250 4161 4590 2.226 1.854 1.322 1.055 165.2 131.8
.275 4577 5049 2.448 2.039 1.454 1.160 181.8 145.0
.300 4993 5508 2.671 2.224 1.586 1.266 198.3 158.2
.325 5409 5967 2.894 2.410 1.718 1.371 214.8 171.4
.350 5825 6426 3.116 2.595 1.851 1.477 231.3 184.6
.375 6241 6885 3.339 2.780 1.983 1.582 247.8 197.8
.400 6657 7344 3.561 2.966 2.115 1.688 264.4 210.9
Valve Intake Exhaust Curtain Area 300 FPS Velocity Minimum Head
Lift Choke Choke Square Inches Cross-Sect Area Flow @ 28 In
inches RPM RPM Intake Exhaust Intake Exhaust Int Exh
.425 7073 7803 3.784 3.151 2.247 1.793 280.9 224.1
.450 7489 8262 4.006 3.336 2.379 1.899 297.4 237.3
.475 7906 8721 4.229 3.522 2.511 2.004 313.9 250.5
.500 8322 9180 4.452 3.707 2.644 2.109 330.5 263.7
.525 8738 9639 4.674 3.892 2.776 2.215 347.0 276.9
.550 9154 10098 4.897 4.078 2.908 2.320 363.5 290.0
.575 9570 10557 5.119 4.263 3.040 2.426 380.0 303.2
lite data vad pipe max rekomenderar för grenrör....
som vanligt på en 4cyl motor så rekomenderar det rätt tunna rör tycker jag, men intresant.
--- Single Primary Pipe Specs --- for 157.844 CID from 6000 to 8500 RPM
Diameter= 1.629 to 1.754 Length= 21.3 to 23.9 inches long
--- 2-Step Primary Pipe Specs ---
1st Dia. inches= 1.629 Length= 10.7 to 12.0
2nd Dia. inches= 1.754 Length= 10.7 to 12.0
--- 3-Step Primary Pipe Specs ---
1st Dia. inches= 1.629 Length= 10.7 to 12.0
2nd Dia. inches= 1.754 Length= 5.3 to 6.0
3rd Dia. inches= 1.879 Length= 5.3 to 6.0
--- Header Collector Specs (Conventional Straight Tube) ---
Diameter= 3.004 to 3.254 Tuned Lengths= 12.9 best and also 6.4 or 25.7
--- Header Collector Specs (Megaphone or Diffuser Cone Shape) ---
Diameter= 2.504 taper to 3.504 Megaphone/Diffuser Length= 12.9 inches
Best HP/TQ Tuned Collector Lengths= 12.9 , 25.7 , 51.5 , 103.0 inches long
Worst HP/TQ Loss Collector Lengths= 19.3 , 38.6 , 77.2 , 154.4 inches long
Note-> all Pipe Diameters are OD and based-off .0625 inch Pipe thickness
---- Primary Pipe's Harmonics ----
1st Harmonic = 96.8 inches long ... typically never used
2nd Harmonic = 36.2 inches long ... longest recommended
3rd Harmonic = 21.3 inches long ... highly recommended , best Torque Curve
4th Harmonic = 14.6 inches long ... shortest recommended
5th Harmonic = 10.8 inches long ... typically never used
6th Harmonic = 8.3 inches long ... typically never used
7th Harmonic = 6.6 inches long ... typically never used
8th Harmonic = 5.3 inches long ... typically never used
---- Collector's Harmonics (includes Intermediate, Muffler , TailPipe) ----
1st Harmonic = 103.0 inches long ... longest with Mufflers and TailPipes
2nd Harmonic = 51.5 inches long ... longest recommended with Mufflers
3rd Harmonic = 25.7 inches long ... more bottom-end Torque
4th Harmonic = 12.9 inches long ... highly recommended , best Torque Curve
5th Harmonic = 6.4 inches long ... reduced Torque , more top-end HP sometimes
6th Harmonic = 3.2 inches long ... reduced Torque , not recommended
jag har en del intresanta funderigar, men vi tar de senare vad tror ni om bas motor uppsettningen?
lite bas fakta om motorn, den har...
89.5mm borr
103mm slag
36x30 ventiler med dryga 350cfm flöde in
en kam med 270/272 0.05" dur och lyft på 0.550/0.510
ett steppat 1 7/8-2" 4:1 grenrör med merage colektor (ingen längd står specat).
race bensin, 760cc cpridare AEM styrning.
effekt
5000/ 259hk
6000/331hk/290lb
7000/381hk
8000/402hk/264lb
max rpm vid race 10000 med 103mm slag
jag slog in lite data i pipe max
57.844 Cubic Inches @ 8000 RPM with 127.0 % Volumetric Efficiency PerCent
Required Intake Flow between 317.7 CFM and 336.5 CFM at 28 Inches
Required Exhaust Flow between 242.4 CFM and 264.5 CFM at 28 Inches
600 RPM/Sec Dyno Test Lowest Low Average Best
Peak HorsePower 373.0 388.4 396.0 403.7
Peak Torque Lbs-Ft 260.1 270.8 276.2 281.5
HorsePower per CID 2.363 2.460 2.509 2.558
Torque per Cubic Inch 1.648 1.716 1.750 1.783
BMEP in psi 248.5 258.7 263.8 269.0
Carb CFM at 1.5 in Hg. 464 516 542 569
Target EGT= 1084 degrees F at end of 4 second 600 RPM/Sec Dyno accel. test
Octane (R+M)/2 Method = 116.0 to 114.6 Octane required range
Air Standard Efficiency = 66.51319 % for 14.800:1 Compression Ratio
Peak HorsePower calculated from Cylinder Head Flow CFM only
600 RPM/Sec Dyno Test Lowest Average Best Potential
Head Flow Peak HP = 367.8 387.2 406.6
----- Engine Design Specifications -----
( English Units ) ( per each Valve Sq.Inch area )
Engine Size CID = 157.844 Intake Valve Net Area = 1.533
CID per Cylinder = 39.461 Intake Valve Dia. Area = 1.577
Rod/Stroke Ratio = 1.480 Intake Valve Stem Area = 0.044
Bore/Stroke Ratio = 0.868 Exhaust Valve Net Area = 1.050
Int Valve/Bore Ratio = 0.805 Exhaust Valve Dia. Area = 1.094
Exh Valve/Bore Ratio = 0.670 Exhaust Valve Stem Area = 0.044
Exh/Int Valve Ratio = 0.833 Exh/Int Valve Area Ratio = 0.693
Intake Valve L/D Ratio= .388 Exhaust Valve L/D Ratio= .432
CFM/Sq.Inch = 100.7 to 106.7 CFM/Sq.Inch =110.8 to 121.0
Curtain Area -to- Valve Area Convergence Intake Valve Lift inch= .354
Curtain Area -to- Valve Area Convergence Exhaust Valve Lift inch= .295
Intake Valve Margin CC's Exhaust Valve Margin CC's
1.00 CC = 0.0387 1.00 CC = 0.0558
0.50 CC = 0.0193 0.50 CC = 0.0279
0.25 CC = 0.0097 0.25 CC = 0.0140
0.10 CC = 0.0039 0.10 CC = 0.0056
------- Piston Motion Data -------
Average Piston Speed (FPM)= 5406.66 in Feet Per Minute
Maximum Piston Speed (FPM)= 8969.46 occurs at 72.996 Degrees ATDC
Piston Depth at 72.996 degree ATDC= 1.7565 inches Cylinder Volume= 280.1 CC
Maximum TDC Rod Tension GForce= 4931.01 G's
Maximum BDC Rod Compression GForce= 2440.16 G's
------- Current Camshaft Specs @ .050 -------
IntOpen= 25.00 IntClose= 65.00 ExhOpen= 66.00 ExhClose= 26.00
Intake Duration @ .050 = 270.00 Exhaust Duration @ .050 = 272.00
Intake CenterLine = 110.00 Exhaust CenterLine = 110.00
Compression Duration= 115.00 Power Duration = 114.00
OverLap Duration = 51.00 Lobe Center Angle (LCA)= 110.00
Camshaft installed Straight Up = 0.00 degrees
-Recommended Camshaft Valve Lift-
Minimum Normal Maximum
Intake = 0.446 0.481 0.529
Exhaust = 0.405 0.436 0.479
Max-effort Intake Lift = 0.554
Max-effort Exhaust Lift = 0.502
Minimum Intake Valve Lift to prevent Choke = .481 Lift @ 8000 RPM
Minimum Exhaust Valve Lift to prevent Choke = .436 Lift @ 8000 RPM
- Induction System Tuned Lengths - ( Cylinder Head Port + Manifold Runner )
1st Harmonic= 30.326 (usually this Length is never used)
2nd Harmonic= 17.212 (some Sprint Engines and Factory OEM's w/Injectors)
3rd Harmonic= 12.016 (ProStock or Comp SheetMetal Intake)
4th Harmonic= 9.458 (Single-plane Intakes , less Torque)
5th Harmonic= 7.674 (Torque is reduced, even though Tuned Length)
6th Harmonic= 6.456 (Torque is reduced, even though Tuned Length)
7th Harmonic= 5.572 (Torque is greatly reduced, even though Tuned Length)
8th Harmonic= 4.901 (Torque is greatly reduced, even though Tuned Length)
Note> 2nd and 3rd Harmonics typically create the most Peak Torque
4th Harmonic is used to package Induction System underneath Hood
Plenum Runner Minimum Recommended Entry Area = 3.389 to 3.812 Sq.Inch
Plenum Runner Average Recommended Entry Area = 3.896 Sq.Inch
Plenum Runner Maximum Recommended Entry Area = 3.980 to 4.709 Sq.Inch
Minimum Plenum Volume CC = 482.8 [typically for Single-Plane Intakes]
Minimum Plenum Volume CID= 29.5 [typically for Single-Plane Intakes]
Maximum Plenum Volume CC = 2586.6 [typically for Tunnel Ram Intakes]
Maximum Plenum Volume CID= 157.8 [typically for Tunnel Ram Intakes]
------- Operating RPM Ranges of various Components -------
Camshaft Intake Lobe RPM = 13157 Exhaust Lobe RPM = 13013
Camshaft's Intake and Exhaust Lobes operating RPM range = 11121 to 13121
Note=> Lobe RPMs are only BallPark estimations
Minimum Intake Valve Lift to prevent Choke = .481 Lift @ 8000 RPM
Minimum Exhaust Valve Lift to prevent Choke = .436 Lift @ 8000 RPM
Current (Intake Valve Curtain Area -VS- Time) Choke RPM = 9154 RPM
Current (Exhaust Valve Curtain Area -VS- Time) Choke RPM = 9364 RPM
Intake Valve Area + Curtain Area operating RPM Range = 8457 to 10457 RPM
Intake Valve Diameter RPM Range = 7154 to 9154
Intake Flow CFM @28in RPM Range = 6525 to 8525
___________________________________________________________________________
Best estimate RPM operating range from all Components = 6866 to 8866
Note=>The BEST Engine Combo will have all Component's RPM Ranges coinciding
___________________________________________________________________________
--- Cross-Sectional Areas at various Intake Port Velocities (@ 28 in.) ---
156 FPS at Intake Valve Curtain Area= 4.897 sq.in. at .550 Lift
242 FPS at Intake Valve OD Area and at Convergence Lift = .354
298 FPS 90% PerCent Rule Seat-Throat Velocity CSA= 2.555 sq.in. at 8000 RPM
350 FPS Velocity CSA= 2.177 sq.in. at 8000 RPM Port Sonic-Choke with HP Loss
330 FPS Velocity CSA= 2.310 sq.in. at 8000 RPM Port Sonic-Choke with HP Loss
311 FPS Velocity CSA= 2.452 sq.in. at 8000 RPM Smallest Useable Port CSA
300 FPS Velocity CSA= 2.541 sq.in. at 8000 RPM Recommended Smallest Port CSA
285 FPS Velocity CSA= 2.675 sq.in. at 8000 RPM Recommended Smallest Port CSA
260 FPS Velocity CSA= 2.932 sq.in. at 8000 RPM Recommended Port CSA
250 FPS Velocity CSA= 3.050 sq.in. at 8000 RPM Recommended Port CSA
240 FPS Velocity CSA= 3.177 sq.in. at 8000 RPM Largest Intake Port Entry CSA
220 FPS Velocity CSA= 3.466 sq.in. at 8000 RPM Largest Intake Port Entry CSA
210 FPS Velocity CSA= 3.631 sq.in. at 8000 RPM Torque Loss + Reversion
200 FPS Velocity CSA= 3.812 sq.in. at 8000 RPM Torque Loss + Reversion
--- Cross-Sectional Areas at various Exhaust Port Velocities (@ 28 in.) ---
161 FPS at Exhaust Valve Curtain Area= 3.781 sq.in. at .510 Lift
278 FPS at Exhaust Valve OD Area and at Convergence Lift = .295
343 FPS 90% PerCent Rule Seat-Throat Velocity CSA= 1.772 sq.in. at 8000 RPM
435 FPS Velocity CSA= 1.399 sq.in. at 8000 RPM Sonic Choke at Throat Area
350 FPS Velocity CSA= 1.737 sq.in. at 8000 RPM Port Sonic-Choke with HP Loss
330 FPS Velocity CSA= 1.844 sq.in. at 8000 RPM Port Sonic-Choke with HP Loss
311 FPS Velocity CSA= 1.956 sq.in. at 8000 RPM Smallest Useable Port CSA
300 FPS Velocity CSA= 2.028 sq.in. at 8000 RPM Recommended Smallest Port CSA
285 FPS Velocity CSA= 2.135 sq.in. at 8000 RPM Recommended Smallest Port CSA
250 FPS Velocity CSA= 2.433 sq.in. at 8000 RPM Recommended Port CSA
240 FPS Velocity CSA= 2.535 sq.in. at 8000 RPM Recommended Port CSA
225 FPS Velocity CSA= 2.704 sq.in. at 8000 RPM Largest Exhaust Port Exit CSA
210 FPS Velocity CSA= 2.897 sq.in. at 8000 RPM Largest Exhaust Port Exit CSA
190 FPS Velocity CSA= 3.202 sq.in. at 8000 RPM Torque Loss + Reversion
180 FPS Velocity CSA= 3.380 sq.in. at 8000 RPM Torque Loss + Reversion
---- Some Useful Formulas are: ----
Average_CSA = Port_Volume_CC / (Port_CenterLine_Length * 16.387)
Port_Volume_CC = Average_CSA * Port_CenterLine_Length * 16.387
Port_CenterLine_Length = Port_Volume_CC / ( Average_CSA *16.387 )
FPS = ( Flow_CFM * 2.4 ) / Average_CSA
Flow_CFM = Average_CSA * FPS * .4166667
Average_CSA = ( Flow_CFM * 2.4) / FPS
Valve Intake Exhaust Curtain Area 300 FPS Velocity Minimum Head
Lift Choke Choke Square Inches Cross-Sect Area Flow @ 28 In
inches RPM RPM Intake Exhaust Intake Exhaust Int Exh
.050 832 918 0.445 0.371 0.264 0.211 33.0 26.4
.075 1248 1377 0.668 0.556 0.397 0.316 49.6 39.6
.100 1664 1836 0.890 0.741 0.529 0.422 66.1 52.7
.125 2080 2295 1.113 0.927 0.661 0.527 82.6 65.9
.150 2496 2754 1.335 1.112 0.793 0.633 99.1 79.1
.175 2913 3213 1.558 1.297 0.925 0.738 115.7 92.3
.200 3329 3672 1.781 1.483 1.057 0.844 132.2 105.5
.225 3745 4131 2.003 1.668 1.190 0.949 148.7 118.7
.250 4161 4590 2.226 1.854 1.322 1.055 165.2 131.8
.275 4577 5049 2.448 2.039 1.454 1.160 181.8 145.0
.300 4993 5508 2.671 2.224 1.586 1.266 198.3 158.2
.325 5409 5967 2.894 2.410 1.718 1.371 214.8 171.4
.350 5825 6426 3.116 2.595 1.851 1.477 231.3 184.6
.375 6241 6885 3.339 2.780 1.983 1.582 247.8 197.8
.400 6657 7344 3.561 2.966 2.115 1.688 264.4 210.9
Valve Intake Exhaust Curtain Area 300 FPS Velocity Minimum Head
Lift Choke Choke Square Inches Cross-Sect Area Flow @ 28 In
inches RPM RPM Intake Exhaust Intake Exhaust Int Exh
.425 7073 7803 3.784 3.151 2.247 1.793 280.9 224.1
.450 7489 8262 4.006 3.336 2.379 1.899 297.4 237.3
.475 7906 8721 4.229 3.522 2.511 2.004 313.9 250.5
.500 8322 9180 4.452 3.707 2.644 2.109 330.5 263.7
.525 8738 9639 4.674 3.892 2.776 2.215 347.0 276.9
.550 9154 10098 4.897 4.078 2.908 2.320 363.5 290.0
.575 9570 10557 5.119 4.263 3.040 2.426 380.0 303.2
lite data vad pipe max rekomenderar för grenrör....
som vanligt på en 4cyl motor så rekomenderar det rätt tunna rör tycker jag, men intresant.
--- Single Primary Pipe Specs --- for 157.844 CID from 6000 to 8500 RPM
Diameter= 1.629 to 1.754 Length= 21.3 to 23.9 inches long
--- 2-Step Primary Pipe Specs ---
1st Dia. inches= 1.629 Length= 10.7 to 12.0
2nd Dia. inches= 1.754 Length= 10.7 to 12.0
--- 3-Step Primary Pipe Specs ---
1st Dia. inches= 1.629 Length= 10.7 to 12.0
2nd Dia. inches= 1.754 Length= 5.3 to 6.0
3rd Dia. inches= 1.879 Length= 5.3 to 6.0
--- Header Collector Specs (Conventional Straight Tube) ---
Diameter= 3.004 to 3.254 Tuned Lengths= 12.9 best and also 6.4 or 25.7
--- Header Collector Specs (Megaphone or Diffuser Cone Shape) ---
Diameter= 2.504 taper to 3.504 Megaphone/Diffuser Length= 12.9 inches
Best HP/TQ Tuned Collector Lengths= 12.9 , 25.7 , 51.5 , 103.0 inches long
Worst HP/TQ Loss Collector Lengths= 19.3 , 38.6 , 77.2 , 154.4 inches long
Note-> all Pipe Diameters are OD and based-off .0625 inch Pipe thickness
---- Primary Pipe's Harmonics ----
1st Harmonic = 96.8 inches long ... typically never used
2nd Harmonic = 36.2 inches long ... longest recommended
3rd Harmonic = 21.3 inches long ... highly recommended , best Torque Curve
4th Harmonic = 14.6 inches long ... shortest recommended
5th Harmonic = 10.8 inches long ... typically never used
6th Harmonic = 8.3 inches long ... typically never used
7th Harmonic = 6.6 inches long ... typically never used
8th Harmonic = 5.3 inches long ... typically never used
---- Collector's Harmonics (includes Intermediate, Muffler , TailPipe) ----
1st Harmonic = 103.0 inches long ... longest with Mufflers and TailPipes
2nd Harmonic = 51.5 inches long ... longest recommended with Mufflers
3rd Harmonic = 25.7 inches long ... more bottom-end Torque
4th Harmonic = 12.9 inches long ... highly recommended , best Torque Curve
5th Harmonic = 6.4 inches long ... reduced Torque , more top-end HP sometimes
6th Harmonic = 3.2 inches long ... reduced Torque , not recommended