Fordmods Logo

excuse me? lifters? 

 

Page 2 of 2 [ 23 posts ] Go to page Previous  1, 2

 
Posted: Mon Dec 06, 2004 9:40 am 
Smokin em up
Offline

Age: 31

Posts: 204

Joined: 6th Nov 2004

Gallery: 2 images

Ride: EL Futura

Location: Kurri Kurri
NSW, Australia

lol yer ok its not standard rule that holdens have lifters but in this era it is.

u have 12 tappets in ur engin...6 on the exhaust valves 6 on the inlet valves...just remove the rocket gear and lift em out...simplleeee
Top
 Profile  
 
 
Posted: Tue Dec 07, 2004 5:45 pm 
Tyre Shredder
Offline

Age: 33

Posts: 310

Joined: 6th Nov 2004

Gallery: 7 images

Ride: EF GliXR

Location: Canberra
ACT, Australia

again, sorry. what exactly do lifters do?

 

_________________

\m/

Top
 Profile  
 
 
Posted: Tue Dec 07, 2004 6:48 pm 
Getting Side Ways
Offline

Posts: 625

Joined: 6th Nov 2004

Ride: R32 GTR

Location: Brackistan
VIC, Australia

They lift things bruvva.
Top
 Profile  
 
 
Posted: Tue Dec 07, 2004 6:50 pm 
Getting Side Ways
Offline

Posts: 625

Joined: 6th Nov 2004

Ride: R32 GTR

Location: Brackistan
VIC, Australia

On a more serious note, lifters are used to open and close valves by the lobe on the camshaft.

Lifters and rockers do the same thing but go about it differently. Rockers are simply an arm that is hinged somewhere near the middle, as the lobe of the camshaft rotates, it pushes one side of the rocker and the other side gets pushed down, this side is pushing on the top of the valve so the valve opens and gas flows.

Lifters are usually hydraulic, the camshaft pushes on a surface that pushes oil through and pushes another piston to open the valve. Same concept, different implementation.
Top
 Profile  
 
 
Posted: Tue Dec 07, 2004 6:55 pm 
Stock as a Rock
Offline

Posts: 197

Joined: 8th Nov 2004

Ride: FG-XR6 EL EA '24 Dodge

Location: Tamworth
NSW, Australia

rockerfella wrote:
again, sorry. what exactly do lifters do?


Tappets/Lifters transmit the action of the cam shaft to the valves. ie open the valves.
Hydraulic lifters take up the lash to reduce the noise.

 

_________________

As Sigfried once said "Nein Nein Ninty Nine"

Top
 Profile  
 
 
Posted: Tue Dec 07, 2004 9:08 pm 
Getting Side Ways
Offline

Age: 36

Posts: 7287

Joined: 5th Nov 2004

Gallery: 12 images

Ride: 1994 ED XR8 Sprint

Location: Somewhere in
QLD, Australia

thank christ you lot dont have to work on engines to put food on your table (flyingnunrt excepted)

tappets and rockers are the same thing, just different names

lifters are also known as camshaft followers (funnily enough cos they follow the profile of the camshaft lobe)

Typical non OHC drivetrain:
Image
OHC Drivetrain with rockers
Image


flyingnunrt is right, the biggest function of hydraulic lifters is to hydraulically adjust the valvetrain to compensate for machining tolerances and wear on the camshaft, etc

you can also get solid lifters, but due to the tolerances that have to be built in (due to expansion of the metals when they are heated) they're noiser than a hydraulic setup, and as they arent self adjusting, you gotta adjust the rockers to compensate for the wear on a regular basis

 

_________________

Banned

Top
 Profile  
 
 
Posted: Tue Dec 07, 2004 9:14 pm 
Tyre Shredder
Offline

Age: 33

Posts: 310

Joined: 6th Nov 2004

Gallery: 7 images

Ride: EF GliXR

Location: Canberra
ACT, Australia

thanks mate, i think that helped. may have to stare at the diagrams for a few more hours, but i'll understand eventually.

 

_________________

\m/

Top
 Profile  
 
 
Posted: Tue Dec 07, 2004 9:28 pm 
Getting Side Ways
Offline

Age: 36

Posts: 7287

Joined: 5th Nov 2004

Gallery: 12 images

Ride: 1994 ED XR8 Sprint

Location: Somewhere in
QLD, Australia

oh, i forgot to mention, if the seals on the hydraulic lifters are f**k, the oil gallery to the lifters is blocked, the oil feed hole in the lifter is blocked, or the oil is too thin (meaning the oil will bleed out of the lifter past the seals) the lifter wont pump up and adjust for the clearances, causing the ticking noise

 

_________________

Banned

Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 2 of 2  [ 23 posts ]  Go to page Previous  1, 2

Who is online

Users browsing this forum: No registered users and 16 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Fri Dec 15, 2017 2:53 am All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names