what makes them differ from the basic sohc/dohc engines

 

Method of valve actuation.

 

the cam is in the block and moves the rocker via the pushrod

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TREVER &raquo;</TD></TR><TR><TD CLASS="quote">the cam is in the block and moves the rocker via the pushrod</TD></TR></TABLE>

so the lobes of the cam, say push the 'rods' that open/close the valves..


as opposed to the 'normal' way, where the lobes str8up open/close the valves?

 

You're leaving out the rocker arms.

OHV engine: Cam - pushrod - rocker arm - valve
OHC engine: Cam - rocker arm - valve

And, who said that overhead cams are the normal/original way of doing it?

 

i said normal,
in the hondizzle sense

 

the pushrods are why OHV engines can't rev very high. Those long rods don't take to high RPM very well.

 

It's not the length of the push rods that limit the RPM, It's due to the combined weight of all items involved working the valves.

Wes Vann

 

I like the Yamaha heads (Taurus SHO, Celica....?)
No rockers, just cam - valve. It seems so much simpler...

 

So what are they, shim & bucket lifters? My old '82 Rabbit & my dad's old '71 Fiat 128 had those. Adjusting valves is a pain, but they almost never went out of adjustment.

 

Pushrods suck ***!

 

also the design of the pushrod location limits the design of the intake manifold. why do you think ford switched to DOHC for their mustang.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sleeperciv &raquo;</TD></TR><TR><TD CLASS="quote">also the design of the pushrod location limits the design of the intake manifold. why do you think ford switched to DOHC for their mustang.</TD></TR></TABLE>

they switched?!?!?

when?!??
w/ the 2003 stang in my avatar?

 

I'm not sure of this (I'll make that disclaimer before I get jumped on), but I think they went from OHV to OHC when they dropped the 5.0 and put in the 4.6. That was in 1997 or 1998, <U>I think</U> .

 

96

95 was the last OHV 5.0