Hypothetical 3200 cc V-8 Engine
ang-velo= 3000 rpm cyl. area= 0.008
10° rot. dt= 0.0006 s burnT= 1500
mileage= 20 mpg kappa= 250
speed= 60 mph aveCombT= 1269
fuel/burn= 0.016 cc Tf= 376
gamma= 1.40 Tcold_resrvoir= 373
compression= 4.0
t (s) P (kPa) V (cc) PV^gamma T (K)
intake valve closes 0.0000 81 400 355934 373
0.0006
begin adiab compression 82 398 374
0.0011 84 391 376
0.0017 87 380 381
0.0022 92 365 387
0.0028 99 346 395
0.0033 108 325 405
0.0039 120 301 418
0.0044 136 276 433
0.0050 156 250 450
0.0056 182 224 470
0.0061 216 199 493
0.0067 258 175 519
0.0072 309 154 547
0.0078 370 135 576
0.0083 437 120 604
0.0089 500 109 627
0.0094 547 102 644
end adiab compr 0.0100 564 100 649
burn 0.0106 1896 102 1234737 1773
begin adiab decomp 0.0111 1733 109 1728
0.0117 1514 120 1663
0.0122 1284 135 1586
0.0128 1073 154 1507
0.0133 894 175 1430
0.0139 748 199 1359
0.0144 633 224 1296
0.0150 543 250 1240
0.0156 472 276 1192
0.0161 418 301 1151
0.0167 376 325 1117
0.0172 344 346 1088
0.0178 320 365 1066
0.0183 302 380 1049
0.0189 290 391 1037
0.0194 283 398 1030
end adiab decomp 0.0200 281 400 1028
open exhaust valve 0.0206 81 398 937
0.0211 81 391 858
0.0217 81 380 791
0.0222 81 365 733
0.0228 81 346 683
0.0233 81 325 640
0.0239 81 301 603
0.0244 81 276 571
0.0250 81 250 543
0.0256 81 224 520
0.0261 81 199 499
0.0267 81 175 482
0.0272 81 154 467
0.0278 81 135 454
0.0283 81 120 442
0.0289 81 109 433
open exhaust valve 0.0294 81 102 425
close exhaust valve0.0300 81 100 417
open intake valve 0.0306 81 102 411
0.0311 81 109 406
0.0317 81 120 401
0.0322 81 135 397
0.0328 81 154 394
0.0333 81 175 391
0.0339 81 199 389
0.0344 81 224 386
0.0350 81 250 385
0.0356 81 276 383
0.0361 81 301 382
0.0367 81 325 380
0.0372 81 346 379
0.0378 81 365 378
0.0383 81 380 378
0.0389 81 391 377
0.0394 81 398 376
close intake valve 0.0400 81 400 376
http://www.keveney.com/otto.html
http://www.antonine-education.co.uk/Physics_A2/options/Module_7/Topic_4/topic_4.htm
http://ecen.com/content/eee7/motoref.htm
Yellow are entered values
m2 All other cells are computed
C White - trivial calculatons
K/s Turquoise - "easy" calcs Full Cycle Results
Violet - heat conduction work done=
Lt Grn - PV=nRT heat added=
K Orange - adiabatic law eff:=W/Q=
"Other" carnotEff=
nR (kPa*cc/K) W (µJ) =PdV
86.9
-1
-11 U just before comb (J)= 141.0
-48 U just after comb (J)= 484.8
-129 fuel energy avail/burn (J)= 542
-270 burn efficiency= 63%
-486
-791 overall efficiency= 30%
-1194
-1700
-2303
-2982
-3690
-4338
-4785
-4835
-4278
-2992
-1081
109.4 2619
11733
17050
19772
20297
19332
17540
15397
13199
11107
9194
7483
5970
4633
3446
2377
1392
458
-228
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
ull Cycle Results
0.147
0.307
48%
79%
2000
1800
Simplified 4 cycle engine cycle - Otto Cycle
1600
1400
1200
Pressure (kPa)
1000
800
600
400
200
0
0 50 100 150 200 250 300 350 400 450
volume (cc)
2000
1800
P (kPa)
1600
V (cc)
1400
T (K)
1200
1000
800
600
400
200
0
0.0000 0.0050 0.0100 0.0150 0.0200 0.0250 0.0300 0.0350 0.0400
W (µJ) =PdV
25000
20000
15000
10000
5000
0
0.0000 0.0050 0.0100 0.0150 0.0200 0.0250 0.0300 0.0350 0.0400 0.0450
-5000
-10000