please explain....
11-15-2003, 10:45 PM
#1
1st Gear Member
Thread Starter
Join Date: Apr 2003
Location: United States
Posts: 95
please explain....
ok, i got into an argument with a guy at work, he says that 4.6's have pushrods, and i said they dont. then when he asked me how the cams and valves, etc work i was kinda stumped, can anyone fill me in as to how the whole deal in the heads works with the cams, etc. and also do 4.6 have rockers and lifters, i told him we have rockers (at least i thought so) was i wrong?
11-15-2003, 11:02 PM
#2
3rd Gear Member
Join Date: Jul 2003
Location: United States
Posts: 802
please explain....
this might help you under stand a little better http://auto.howstuffworks.com/camshaft1.htm</P>
it uses lobes to open and close the valves...the lobes press on the rocker arms which in turn pushes the vavle spring causing it to go down leting the intake/exhaust valve stay open. that link is good look at it!</P>
11-16-2003, 09:14 AM
#7
Moderating with Angels
Join Date: Jul 2003
Location: New Orleans La
Posts: 4,231
please explain....
with the mod motors, the overhead cams eliminate standard pushrods. the cam sits atop each cylinder bank and has direct interaction with the valves. pushrods are found in 302/351 motors where a single cam is utilized. the pushrods in those motors connect the cam to the rockers. i will get more tech info up on this in a little while
11-16-2003, 04:45 PM
#8
4th Gear Member
Join Date: Sep 2003
Location: United States
Posts: 1,404
please explain....
Tell your buddy at work he's full of crap. In a pushrod engine, the camshaft lies in the center of the block, with lifters in the lifter bores resting against the cam lobes, which raise up and down and "push" the pushrods (hence the name) up against the rocker arms, which forces the valves open. OHC engines use cam followers or "tappets" which are contacted directly by the camshaft lobes to open and close the valves. The 4.6 has the cams in the cylinder heads, and the whole purpose of that design was to eliminate pushrods. If you're comfortable enough with it, pull a valve cover off your engine and take a look. Just don't get any dirt inside your head. <IMG src=smileys/smiley2.gif border="0"></P><edited><editID>USAMuscle</editID><editDate>37941.6153240741</editDate></edited>
11-16-2003, 04:56 PM
#9
Guest
Posts: n/a
please explain....
Everyone is right, your friend is a moron. heh</P>
OHV=OverHead Valve, withpushrods. 302sas tripsevn7 said</P>
OHC=OverHead Cam,no pushrods. Mustang GT is SOHC, SVTs are DOHC.</P>
DOHC cars tend to have a higher Volumetic Efficiency...which means it flows slightly better than that of the SOHC motors.</P><edited><editID>own3dbyyou</editID><editDate>37941.6230208333</editDate></edited>
