Erland Cox skrev:Jag tror att du hade fått mer effekt med mindre ventiler. Om du ger mig lite uppgifter på din motor så kan jag prova att köra den i Dynomation och se vad som händer. Borr, slag, staklängd, kamvärden, komp, flöde, hur grenrören ser ut med ingångsmått på insug. Dynomation har en massa turboaggregat inlagda så med lite tur finns ditt eller ett liknande. Erland.
vi vill ha max effekt vid 8000-8500rpm
på boströms volvo motorn som jag gjort toppen på och skissat på conseptet en hel del i övrigt också (B230 8v med 46x41.5ventiler och 43mm dim insugnings canal) så kör vi en kam med dessa värden med 37mm hel tryckare.
lyft dur
0.3 313
0.4 303
1.0 285
1.25 280
2.0 269
3.0 255
4.0 241
5.0 228
6.0 214
7.0 201
8.0 186
9.0 171
10.0 155
11.0 137
12.0 116
13.0 88
13.9 peak
111nock vinkel
räknar man på 313graders ventilspels dur och 111 graders nock monterad utan advans så blir tiderna 45.5-180-87.5 på insug och 87.5 (eller lite mer om man advansa lite) graders öppning på avgassidan och eftersom vi är tvingade till att göra förbräningen långsam för att undvika spikning så är risken att man släpper ut tryck som kan ha använts till att göra effekt om man har ännu tidigare öppning, tror jag
och då är utvägen att montera en större avgasventil (41.5mm)nåra andra intresanta data på denna motor är...
borr slag 96.0x80/152mm stake
att det är ca halva avgastrycket mott laddtryck (2bar ladd= 0.85bar avgastryck)
värkningsgraden på compressorn är ca 75% på full gas.
insugnings temp ca 45 grader.
70-75cm långa grenrör med 47mm invändig dim. uppdelad colektor för att inte störa ut de andra parets cylindrar.
minsta aria under sätet , 0.89= ca 41mm
ca 43mm dim insugnings canal (motsvarande aria)
ca 45mm dim vid insugnings packningen.
ett insugnings rör som konar upp till 63mm trattar (mins inte längd, ca 18cm+topp?)
5.6mm lyft vid övre dp på överlappet.
toppen flödar ca 240in med insug på 14mm, och 165cfm ut med ett 20cm rör.
141.324 Cubic Inches @ 8000 RPM with 108.0 % Volumetric Efficiency PerCent
Required Intake Flow between 227.3 CFM and 240.0 CFM at 28 Inches
Required Exhaust Flow between 194.5 CFM and 204.7 CFM at 28 Inches
600 RPM/Sec Dyno Test Lowest Low Average Best
Peak HorsePower 245.3 255.4 260.4 265.5
Peak Torque Lbs-Ft 177.5 184.8 188.4 192.1
HorsePower per CID 1.736 1.807 1.843 1.878
Torque per Cubic Inch 1.256 1.308 1.333 1.359
BMEP in psi 189.4 197.2 201.1 205.0
Carb CFM at 1.5 in Hg. 353 393 413 433
Target EGT= 1262 degrees F at end of 4 second 600 RPM/Sec Dyno accel. test
Octane (R+M)/2 Method = 105.6 to 106.8 Octane required range
Air Standard Efficiency = 63.53699 % for 12.000:1 Compression Ratio
Peak HorsePower calculated from Cylinder Head Flow CFM only
600 RPM/Sec Dyno Test Lowest Average Best Potential
Head Flow Peak HP = 236.8 263.9 291.0
----- Engine Design Specifications -----
( English Units ) ( per each Valve Sq.Inch area )
Engine Size CID = 141.324 Intake Valve Net Area = 2.495
CID per Cylinder = 35.331 Intake Valve Dia. Area = 2.573
Rod/Stroke Ratio = 1.898 Intake Valve Stem Area = 0.078
Bore/Stroke Ratio = 1.200 Exhaust Valve Net Area = 2.008
Int Valve/Bore Ratio = 0.479 Exhaust Valve Dia. Area = 2.087
Exh Valve/Bore Ratio = 0.431 Exhaust Valve Stem Area = 0.078
Exh/Int Valve Ratio = 0.901 Exh/Int Valve Area Ratio = 0.811
Intake Valve L/D Ratio= .298 Exhaust Valve L/D Ratio= .331
CFM/Sq.Inch = 88.4 to 93.3 CFM/Sq.Inch =93.2 to 98.1
Curtain Area -to- Valve Area Convergence Intake Valve Lift inch= .452
Curtain Area -to- Valve Area Convergence Exhaust Valve Lift inch= .407
Intake Valve Margin CC's Exhaust Valve Margin CC's
1.00 CC = 0.0237 1.00 CC = 0.0292
0.50 CC = 0.0119 0.50 CC = 0.0146
0.25 CC = 0.0059 0.25 CC = 0.0073
0.10 CC = 0.0024 0.10 CC = 0.0029
------- Piston Motion Data -------
Average Piston Speed (FPM)= 4200.00 in Feet Per Minute
Maximum Piston Speed (FPM)= 6823.19 occurs at 76.116 Degrees ATDC
Piston Depth at 76.116 degree ATDC= 1.3958 inches Cylinder Volume= 256.6 CC
Maximum TDC Rod Tension GForce= 3617.09 G's
Maximum BDC Rod Compression GForce= 2108.97 G's
------- Current Camshaft Specs @ .050 -------
IntOpen= 24.00 IntClose= 66.00 ExhOpen= 66.00 ExhClose= 24.00
Intake Duration @ .050 = 270.00 Exhaust Duration @ .050 = 270.00
Intake CenterLine = 111.00 Exhaust CenterLine = 111.00
Compression Duration= 114.00 Power Duration = 114.00
OverLap Duration = 48.00 Lobe Center Angle (LCA)= 111.00
Camshaft installed Straight Up = 0.00 degrees
-Recommended Camshaft Valve Lift-
Minimum Normal Maximum
Intake = 0.626 0.674 0.741
Exhaust = 0.528 0.569 0.626
Max-effort Intake Lift = 0.777
Max-effort Exhaust Lift = 0.656
Minimum Intake Valve Lift to prevent Choke = .674 Lift @ 8000 RPM
Minimum Exhaust Valve Lift to prevent Choke = .569 Lift @ 8000 RPM
- Induction System Tuned Lengths - ( Cylinder Head Port + Manifold Runner )
1st Harmonic= 29.718 (usually this Length is never used)
2nd Harmonic= 16.867 (some Sprint Engines and Factory OEM's w/Injectors)
3rd Harmonic= 11.775 (ProStock or Comp SheetMetal Intake)
4th Harmonic= 9.268 (Single-plane Intakes , less Torque)
5th Harmonic= 7.520 (Torque is reduced, even though Tuned Length)
6th Harmonic= 6.326 (Torque is reduced, even though Tuned Length)
7th Harmonic= 5.460 (Torque is greatly reduced, even though Tuned Length)
8th Harmonic= 4.802 (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 = 2.425 to 2.728 Sq.Inch
Plenum Runner Average Recommended Entry Area = 2.788 Sq.Inch
Plenum Runner Maximum Recommended Entry Area = 2.848 to 3.370 Sq.Inch
Minimum Plenum Volume CC = 432.3 [typically for Single-Plane Intakes]
Minimum Plenum Volume CID= 26.4 [typically for Single-Plane Intakes]
Maximum Plenum Volume CC = 2315.9 [typically for Tunnel Ram Intakes]
Maximum Plenum Volume CID= 141.3 [typically for Tunnel Ram Intakes]
------- Operating RPM Ranges of various Components -------
Camshaft Intake Lobe RPM = 7215 Exhaust Lobe RPM = 6647
Camshaft's Intake and Exhaust Lobes operating RPM range = 5073 to 7073
Note=> Lobe RPMs are only BallPark estimations
Minimum Intake Valve Lift to prevent Choke = .674 Lift @ 8000 RPM
Minimum Exhaust Valve Lift to prevent Choke = .569 Lift @ 8000 RPM
Current (Intake Valve Curtain Area -VS- Time) Choke RPM = 6411 RPM
Current (Exhaust Valve Curtain Area -VS- Time) Choke RPM = 7592 RPM
Intake Valve Area + Curtain Area operating RPM Range = 4644 to 6644 RPM
Intake Valve Diameter RPM Range = 4411 to 6411
Intake Flow CFM @28in RPM Range = 6012 to 8012
___________________________________________________________________________
Best estimate RPM operating range from all Components = 5826 to 7826
Note=>The BEST Engine Combo will have all Component's RPM Ranges coinciding
___________________________________________________________________________
--- Cross-Sectional Areas at various Intake Port Velocities (@ 28 in.) ---
178 FPS at Intake Valve Curtain Area= 3.071 sq.in. at .540 Lift
212 FPS at Intake Valve OD Area and at Convergence Lift = .452
262 FPS 90% PerCent Rule Seat-Throat Velocity CSA= 2.084 sq.in. at 8000 RPM
350 FPS Velocity CSA= 1.558 sq.in. at 8000 RPM Port Sonic-Choke with HP Loss
330 FPS Velocity CSA= 1.653 sq.in. at 8000 RPM Port Sonic-Choke with HP Loss
311 FPS Velocity CSA= 1.754 sq.in. at 8000 RPM Smallest Useable Port CSA
300 FPS Velocity CSA= 1.819 sq.in. at 8000 RPM Recommended Smallest Port CSA
285 FPS Velocity CSA= 1.914 sq.in. at 8000 RPM Recommended Smallest Port CSA
260 FPS Velocity CSA= 2.098 sq.in. at 8000 RPM Recommended Port CSA
250 FPS Velocity CSA= 2.182 sq.in. at 8000 RPM Recommended Port CSA
240 FPS Velocity CSA= 2.273 sq.in. at 8000 RPM Largest Intake Port Entry CSA
220 FPS Velocity CSA= 2.480 sq.in. at 8000 RPM Largest Intake Port Entry CSA
210 FPS Velocity CSA= 2.598 sq.in. at 8000 RPM Torque Loss + Reversion
200 FPS Velocity CSA= 2.728 sq.in. at 8000 RPM Torque Loss + Reversion
--- Cross-Sectional Areas at various Exhaust Port Velocities (@ 28 in.) ---
173 FPS at Exhaust Valve Curtain Area= 2.765 sq.in. at .540 Lift
230 FPS at Exhaust Valve OD Area and at Convergence Lift = .407
283 FPS 90% PerCent Rule Seat-Throat Velocity CSA= 1.690 sq.in. at 8000 RPM
435 FPS Velocity CSA= 1.101 sq.in. at 8000 RPM Sonic Choke at Throat Area
350 FPS Velocity CSA= 1.368 sq.in. at 8000 RPM Port Sonic-Choke with HP Loss
330 FPS Velocity CSA= 1.452 sq.in. at 8000 RPM Port Sonic-Choke with HP Loss
311 FPS Velocity CSA= 1.541 sq.in. at 8000 RPM Smallest Useable Port CSA
300 FPS Velocity CSA= 1.597 sq.in. at 8000 RPM Recommended Smallest Port CSA
285 FPS Velocity CSA= 1.681 sq.in. at 8000 RPM Recommended Smallest Port CSA
250 FPS Velocity CSA= 1.916 sq.in. at 8000 RPM Recommended Port CSA
240 FPS Velocity CSA= 1.996 sq.in. at 8000 RPM Recommended Port CSA
225 FPS Velocity CSA= 2.129 sq.in. at 8000 RPM Largest Exhaust Port Exit CSA
210 FPS Velocity CSA= 2.282 sq.in. at 8000 RPM Largest Exhaust Port Exit CSA
190 FPS Velocity CSA= 2.522 sq.in. at 8000 RPM Torque Loss + Reversion
180 FPS Velocity CSA= 2.662 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
.050 594 703 0.284 0.256 0.135 0.119 16.9 14.8
.075 890 1054 0.426 0.384 0.202 0.178 25.3 22.2
.100 1187 1406 0.569 0.512 0.270 0.237 33.7 29.6
.125 1484 1757 0.711 0.640 0.337 0.296 42.2 37.0
.150 1781 2109 0.853 0.768 0.405 0.356 50.6 44.4
.175 2078 2460 0.995 0.896 0.472 0.415 59.0 51.8
.200 2374 2812 1.137 1.024 0.540 0.474 67.5 59.3
.225 2671 3163 1.279 1.152 0.607 0.533 75.9 66.7
.250 2968 3515 1.422 1.280 0.675 0.593 84.3 74.1
.275 3265 3866 1.564 1.408 0.742 0.652 92.8 81.5
.300 3562 4218 1.706 1.536 0.810 0.711 101.2 88.9
.325 3858 4569 1.848 1.664 0.877 0.770 109.6 96.3
.350 4155 4921 1.990 1.792 0.945 0.830 118.1 103.7
.375 4452 5272 2.132 1.920 1.012 0.889 126.5 111.1
.400 4749 5624 2.275 2.048 1.080 0.948 134.9 118.5
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 5046 5975 2.417 2.176 1.147 1.007 143.4 125.9
.450 5342 6327 2.559 2.304 1.215 1.067 151.8 133.3
.475 5639 6678 2.701 2.432 1.282 1.126 160.3 140.7
.500 5936 7030 2.843 2.560 1.349 1.185 168.7 148.1
.525 6233 7381 2.985 2.688 1.417 1.244 177.1 155.5
.550 6530 7732 3.127 2.816 1.484 1.304 185.6 162.9
.575 6826 8084 3.270 2.944 1.552 1.363 194.0 170.4
.600 7123 8435 3.412 3.072 1.619 1.422 202.4 177.8
.625 7420 8787 3.554 3.201 1.687 1.481 210.9 185.2
.650 7717 9138 3.696 3.329 1.754 1.541 219.3 192.6
.675 8014 9490 3.838 3.457 1.822 1.600 227.7 200.0
.700 8310 9841 3.980 3.585 1.889 1.659 236.2 207.4
.725 8607 10193 4.123 3.713 1.957 1.718 244.6 214.8
.750 8904 10544 4.265 3.841 2.024 1.778 253.0 222.2
.775 9201 10896 4.407 3.969 2.092 1.837 261.5 229.6
.800 9498 11247 4.549 4.097 2.159 1.896 269.9 237.0
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
.825 9794 11599 4.691 4.225 2.227 1.955 278.3 244.4
