GT World Challenge Europe Endurance
09 mag
-
10 mag
Canceled
17 lug
-
19 lug
Prossimo evento tra
39 giorni
WSBK
G
Imola
08 mag
-
10 mag
Evento concluso
G
Donington Park
03 lug
-
05 lug
Postponed
WRC
21 mag
-
24 mag
Evento concluso
04 giu
-
07 giu
WEC
13 ago
-
15 ago
Prossimo evento tra
66 giorni
W Series
G
29 mag
-
30 mag
Canceled
G
Anderstorp
12 giu
-
13 giu
Canceled
MotoGP
28 mag
-
31 mag
Evento concluso
Moto3
G
Mugello
29 mag
-
31 mag
Evento concluso
G
Barcellona
05 giu
-
07 giu
Moto2
G
Mugello
29 mag
-
31 mag
Evento concluso
G
Barcelona
05 giu
-
07 giu
IndyCar
06 giu
-
06 giu
Evento concluso
25 giu
-
27 giu
Canceled
Formula E
05 giu
-
06 giu
Evento concluso
G
Berlin ePrix
20 giu
-
21 giu
Prossimo evento tra
12 giorni
FIA F3
G
Zandvoort
01 mag
-
03 mag
Evento concluso
G
Red Bull Ring
03 lug
-
05 lug
Prossimo evento tra
25 giorni
FIA F2
G
Monaco
21 mag
-
23 mag
Evento concluso
G
05 giu
-
07 giu
Formula 1
21 mag
-
24 mag
Canceled
04 giu
-
07 giu
Postponed
ELMS
G
Paul Ricard
17 lug
-
19 lug
Prossimo evento tra
39 giorni
G
Spa-Francorchamps
07 ago
-
09 ago
Prossimo evento tra
60 giorni
DTM
10 lug
-
12 lug
Prossimo evento tra
32 giorni
G
Anderstorp
31 lug
-
02 ago
Canceled
GT World Challenge Europe Sprint
01 mag
-
03 mag
Canceled
07 ago
-
09 ago
Prossimo evento tra
60 giorni
WTCR
19 giu
-
21 giu
Prossimo evento tra
11 giorni
G
Salzburgring
11 set
-
13 set
Prossimo evento tra
95 giorni

Why Are 4 Valves Better Than 2? DOHC vs OHV

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Why are 4 valves per cylinder better than 2 valves per cylinder? Is DOHC better than OHV? 4 valves per cylinder allows for more airflow than 2 valves per cylinder, as there is larger open area when the valves are open. Having a configuration with DOHC and four valves per cylinder means better airflow, especially at high engine speeds, resulting in better top end power. Though it is possible to run 4 valves per cylinder with a pushrod setup (OHV), it's far more common to run 2 valves due to the complication of the packaging requirements associated with a four valve setup.

The main advantages of a multi-valve head is that it allows for more airflow through greater coverage, placement of the spark plug in the center of the head for better flame propagation leading to greater efficiency, and it greatly reduces valve float at higher RPM through the use of smaller, lighter valves with less reciprocating inertia. With the prevention of valve float, engines can rev higher and produce more power.

The advantages of two valves per cylinder is a reduction of parts, thus saving cost and complexity. The design also tends to be better for low and mid range torque as the airflow is faster at these engine speeds as a result of a more restricted flow. Also, OHV engines allow for central placement of the camshaft within the V of V8 engines, meaning a smaller package and lower CG.

Related Videos:
DOHC vs SOHC vs OHV - https://youtu.be/1GZtShToroc
HEMI Engine - https://youtu.be/qLns7ibeUps
VTEC - https://youtu.be/G6S4D14VS7w
3 Stage VTEC - https://youtu.be/Ol3nWQbatrQ

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