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Old 23 Nov 2009, 03:31 pm
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Default Whats better about having SOHC compared to DOHC in a civic?

Just wondering what everyone likes or dislikes about single cam civics to twin cam civics.
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Old 23 Nov 2009, 03:46 pm
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it just is dude
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Old 23 Nov 2009, 04:46 pm
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nothing just less power. their both made out of rice so its like wild rice vs brown rice witch tastes better? Chris is an Idiot and loves RICE!!!
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Old 23 Nov 2009, 05:01 pm
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SOHC would mean more bottom end throttle responce as the engine has only got to drive one camshaft, but DOHC results on more power and a smoother engine ride as there is better control of the valve timing and fuel/exhaust flow. most SOHC engines will be 8valve, whereas most 16v will be DOHC, although my civic was 16v and SOHC. In a civic DOHC is better as VTEC uses DOHC by swapping to a second camshaft at VTEC engagement, to allow variable valve timing and optimizes fuel flow and exhaust flow from the cylinders, simultaneously improving fuel economy and performance.

No pranK, chris knows what he's talking about, you are a moron.

So many trolls on here......
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Old 23 Nov 2009, 05:16 pm
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To keep it simple, kind of:

When you hear SOHC vs DOHC I'm sure one of the next few words you hear is VTEC. VTEC is what it all comes down to in SOHC vs DOHC besides the obvious more power that stock DOHC Honda engines make. The older SOHC engines when VTEC engaged only benefited from the intake valves unlike the DOHC where once VTEC engaged the engines ability to take in both fuel/air AND expel exhaust were increased.

On the SOHC engines there is the normal set of cam lobes and the VTEC cam lobes (intake only) but only just one camshaft doing everything from the VTEC work to normal driving conditions to operating both the intake and exhaust valves. Since there was little space and things being in the way the exhaust benefits of VTEC were given up on the SOHC engines.

On DOHC there are different sets of lobes on each camshaft, and obviously there are 2 camshafts now thus providing more room. Since Honda gave a camshaft for both the exhaust and intake valves the DOHC engines were able to benefit from both the exhaust and intake power gains that VTEC gave now that there was more space for the additional exhaust lobes and rocker arms unlike the SOHC which only benefited from the intake due to the spark plugs being in the way.

The newest SOHC motors (2009+) though, do benefit from both the intake and exhaust valves when VTEC is engaged.

So, DOHC when it comes to power is definantly the better choice but that doesn't mean SOHC engines should be under estimated, there are some out there doing 400+ whp.
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Old 23 Nov 2009, 05:31 pm
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alright...lets keep it simple....sohc will give you better gas miliage but less power compared to a dohc....
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Old 23 Nov 2009, 05:46 pm
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john m explained it simple enough.

single cam sohc better gas mileage, dual cam dohc better performance.

chris knows what he is talking about and second what he says with the exception that most sohc hondas are 8 valves per cylinder, most i have seen are 16 valves / 4 per cylinder.

pranK is a IDIOT with a capital I D I O & T

dual cams have more potential to be built for performance so most tuners will recommend dohc vs sohc.
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