Difference VTEC Sohc & Dohc

[Llfr]

What's the difference between the SOHC and DOHC. I have read up on the

definitions but I still don't understand.

[Porker]

SOHC = Single Overhead Cam

 

DOHC = Double Overhead Cam

 

 

SOHC = 2 valves (1 intake and 1 exhaust)

 

DOHC = 4 valves (2 intake and 2 exhaust)

 

Hope I'm correct also

[Quantum]

this is quite interesting topic, do a search in MCF you will find many many... discussion regarding SOHC and DOHC

good luck

[Seanboi]

Maybe u can do a search on Wikipedia to learn more?

 

DOHC more power at high end.

[Llfr]

I did a search and understand the different valves involved.

 

Does SOHC and DOHC valves both opens up at 5000rpm once which is different

from the VTEC SiR model?

[Mcff_1980]

very simple lar

 

SOHC = One leg hopping

DOHC = two leg running

 

so which faster?

[Mcff_1980]

with a vafc, u can easily set what point u wan vtec to kui

Edited September 10, 2007 by Mcff_1980

[Porker]

VTEC and SOHC/DOHC are totally unrelated concepts.

 

VTEC = opening more of the valve via lift so the engine can breathe better (sorta like the human nose)

 

SOHC/DOHC = number of cams and valves

 

More valves = Engine breathes better cos more openings

 

VTEC is controlled by the cam design.

[Llfr]

Then how come a 92' civic vti DOHC opens once

and a 96' civic Sir DOHC opens twice?

 

Sorry ah.. I'm a noob to VTEC

[Quantum]

One leg hopping is faster

coz, 'One leg hopping' Honda Civic eats most 'two leg running' cars in same sergment

[Crummytyre]

Blame Honda marketting.

 

There are so many versions of VTEC that it confuses everybody. The different versions of VTEC are common in name only. They are very different engines with very different working principles. Some are brilliant, some are not so fantastic. But since they are all badged as VTEC....

[Vidz]

  Quote

very simple lar

 

SOHC = One leg hopping

DOHC = two leg running

 

so which faster?

 

when running very fast, 2 legs faster

but when hopping, one leg faster cos, 2 legs are heavier

 

when sitting down, no diff

[Route88]

Nowadays SOHC come with 16 valve...4 valves per cyclinder

2 intake,2 xhaust

[Porker]

Oops hehe

[Mcff_1980]

  Quote

Then how come a 92' civic vti DOHC opens once

and a 96' civic Sir DOHC opens twice?

 

Sorry ah.. I'm a noob to VTEC

 

92vti b16a2 is about the same as the 96sir b16a4, just that the b16a4 got about 10 more bhp.

both vtec open once.

 

if u say vtec open twice, should be the b18c (integra dc2)

[Quantum]

as the manufacture tech improving, SOHC will takeover back DOHC in small cc engine

honda civic is a good example

Edited September 10, 2007 by Quantum

[Mcff_1980]

  Quote

One leg hopping is faster

coz, 'One leg hopping' Honda Civic eats most 'two leg running' cars in same sergment

 

agree

[Route88]

SOHC and DOHC already being discussed,go and do a search.

If between both on Honda engine,you might wanna highlight,what type of engine code do you refer too.

There are differences cos type of cams Honda use.