Temperatur Udara Lingkungan T
o
: 25
Konstanta Udara R :
0,287 Kjkg.k Efisiensi Mekanis
m
: 0,85
Air Fuel Ratio AFR :
15 Efisiensi Pembakaran
c
:0,96 Ratio of heat specific C
p
C
v
k :
1,4 Coefficient of rolling resistance C
R
: 2,46038 x
Drag coefficient C
D
: 0,064
4.2. Data Output
Data yang dimasukkan ke dalam input kemudian di proses agar menghasilkan
data keluaran berupa output. 4.2.1 Diameter Piston
Dp = B – 2 . Δy
Dp = 50 1000 – 2 . 0,004 1000 Dp = 0,049992 m
4.2.2 Panjang Connecting Rod
r = 1,75 x S r = 1,75 . S
r = 1,75 . 55,6 1000 r = 0,0973 m
4.2.3 Crank Radius Crank Offset
a = S 2
Universitas Sumatera Utara
a = 55,6 1000 2 a = 0,0278 m
4.2.4 Ratio of connecting rod length to crank offset
R
=
R = 0,0973 0,0278 R = 3,5
4.2.5 Ratio of bore to stroke
BS = BS = 50 1000 55,6 1000
BS = 0,89928
4.2.6 Jarak antara the crank axis pin piston
S = S = 0,0278 cos20 +
S = 0,02612088 + S = 0,02612088 + 0,096834
S = 0,1229552 m
4.2.7 Jarak permukaan piston dari TDC
x = r + a + s x = 0,0973 + 0,0278 – 0,1229552
Universitas Sumatera Utara
x = 0,0021448 m
4.2.8 Kecepatan Piston Rata-rata
Ūp = 2 S N Ūp = 2 x 55,6 1000 x 7500 60
Ūp = 13,9 ms
4.2.9 Kec. Piston pada Akhir Pembakaran
Up = Ūp.
Up = 13,9 { 3,142 sin [ 1 + cos
Up = 13,9 { 1,57 0,3420[1+ 0,9396926 Up = 13,9 { 0,53694 [ 1 + 0,9396926 3,48324 ]}
Up =13,9 { 0,53694 [ 1 + 0,269774 ]} Up = 13,9 { 0,53694 1,269774}
Up = 13,9 0,6776711 Up = 9,419629 ms
4.2.10 Volume Displacement 1 Cylinder
Vd = Vd
= Vd
= Vd = 0,000109115
Universitas Sumatera Utara
4.2.11 Volume Displacement N Cylinder
Vd-total = Vd-total = Nc x Vd
Vd-total = 1 x 0,000109115 Vd-total = 0,000109115
4.2.12 Volume Clearance Sisa
Vc =
Vc =
Vc = 0,000013639375
4.2.13 Volume Silinder pada Tiap Sudut Engkol
V = Vc + π 4 r + a – s
V = 0,000013639375 + 3,14 0,0973 + 0,0278 – 0,12295
V = 0,000013639375 + 0,0019625 0,0021448 V = 0,000017848545
V = 1,7848545 x
4.2.14 Massa Jenis Udara Lingkungan
ρa =
ρa =
Universitas Sumatera Utara
ρa = ρa = 1,1809274
4.2.15 Massa jenis Udara masuk ke Silinder
