the ZC DOHC (black top) (non vtec)

or the

SOHC (non vtec)

if both were turbo with same setup?

beacause i see a heap more soch turbos than dohc turbo setups why????

 

I'd say dohc, because the head probally flows more. Maybe I'm wrong thou..

 

you probably see more sohc turbos than dohc because people probably cant afford the swap and a turbo so they just pick one. and i would have to agree with m R g S r on the power potential.

 

I would have to go with the ZC. It is the same as the LS right?

 

I don't know the specifics of those two motors, but assuming the bottm ends are identical or similar, then the DOHC wil make more power at the same boost level due to better head flow.

 

The 'D' on DOHC stands for dope which means it's better.

The 'S' on SOHC stands for shitty which means not as good as dope.

All kidding aside, the DOHC motor's head flows better than the SOHC obviously yeilding more power with all things being equal.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by macrosshn &raquo;</TD></TR><TR><TD CLASS="quote">The 'D' on DOHC stands for dope which means it's better.
The 'S' on SOHC stands for shitty which means not as good as dope. </TD></TR></TABLE>

LOL I'm glad someone finally cleared that up

 

A ZC might flow better than other SOHC d16 heads, but it has nothing to do with the fact that it's DOHC. The only *guaranteed* advantage a DOHC has is increased ability to adjust the intake and exhaust cams independantly (not an easy task on a sohc ) . The rest is strictly head design.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fsp31 &raquo;</TD></TR><TR><TD CLASS="quote">A ZC might flow better than other SOHC d16 heads, but it has nothing to do with the fact that it's DOHC. The only *guaranteed* advantage a DOHC has is increased ability to adjust the intake and exhaust cams independantly (not an easy task on a sohc ) . The rest is strictly head design.</TD></TR></TABLE>

That's not necessarily true. If that was the only reason to use DOHC, and there were not flow benefits, then there would be no reason for a manufacturer to use DOHC.

A lot of DOHC heads can control more valve area than SOHC.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kpt4321 &raquo;</TD></TR><TR><TD CLASS="quote">That's not necessarily true. If that was the only reason to use DOHC, and there were not flow benefits, then there would be no reason for a manufacturer to use DOHC.

A lot of DOHC heads can control more valve area than SOHC.</TD></TR></TABLE>

Manufacturers do it for the best reason of all ---&gt; it is a feature with perceived value that sells lots of cars. You can make a sohc head that has the same exact port shapes, combustion chamber, valves, valve lift, and valve timing as any dohc head. If you were to hide the valve cover and timing belt from view, both you and the air going thru the engine would have no way of knowing if it was sohc or dohc. With that being said, dohc engines *usually* have three advantages: (1) you can adjust the overlap between intake and exhaust cams (2) they usually have lighter valvetrain components, but not always, and (3) they usually come from the factory tuned more for performance than sohc engines do. So sohc head + good porting + stiffer valve springs + good cam grind = dohc performance or better.

 

I'm not relating this to hondas because I haven't spent much time on ZC's or b series motors. Just general theorizing and blowing of hot air.

&gt;&gt;A lot of DOHC heads can control more valve area than SOHC.&lt;&lt;

I know I'm splitting hairs here a bit, but I still think that's a function of head and valvetrain design rather than the number of cams. Rocker length determines what an SOHC can do in this case. But I guess valvetrain weight is one advantage of a DOHC I forgot to mention, since the cam lobes can get right over the tops of the valves, thus reducing the size of the rockers, or eliminating them altogether.