I'm trying to learn about engines, and I would like to know what lifters are and what their purpose is within an engine? Where are they located in an engine without pushrods/ an engine that has overhead cams? Are they in between the rocker arm and the cam lobe? I've tried searching, but I cannot find an answer. Thank you-David.
2006-10-02 13:55:01 · 11 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
lifters are the compoents that actually ride on the cam to take the load to open the valves. on an overhead cam engine they are under the cam above the valves. and serve the same purpose. hydralic lifters fill with oil to reduce noise and wear, while solid usually found in performance applications are loud and have no give
2006-10-02 14:04:35 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Lifters are the second piece in the upper valve train, they sit on top of the cam. As the cam is rotated it pushes on the bottom of the lifter and then the lifter pushes up on the push rod and then on the rocker arm. There are 2 types that i know of. The first one is a solid mechanical lifter (these were used on some engines) and the most common is the Hydraulic flat tappet lifter. The only purpose that i know of is they help with cushing the valve train. hope this helps
2006-10-02 21:19:50 · answer #2 · answered by Rusty S 1 · 0⤊ 0⤋
All engines with valves are equipped with lifters. On overhead cam engines, they are located between the cam and the valve. On push rod type engines, the lifter is between the cam and the push rod. The push rod connects to a rocker arm. Lifters are generally hydraulic. In other words, oil under pressure is supplied to the inside of the lifter to not only provide lubrication, but to also give a cushioning effect to the valve train
2006-10-02 21:15:44 · answer #3 · answered by Mr. Badwrench 6 · 0⤊ 0⤋
the lifters as you would call them in an over head cam engine are located directly under the cam. in most cases they are spring loaded with an oil chamber to keep them lubricated. the purpose of the lifters in the over head cam system is to open and close the valves in a precise manner. Some models...such as dodge have spacers they use under the lifters to make them exact. the lifters are placed under the cam lobes...in turn when the cam lobe comes to it's peak it opens that certain valve...either intake or exhaust...letting fuel in or letting spent gas out. Or on the compression stroke both valves are left shut in order to allow the spark from the spark plug ignite the fuel...the next stroke is called the power stroke...at this instant the valves remain shut and the explosion caused by the gas and spark forces the cylinder down. At the same time 2 other cylinders are doing 2 seperate operations (in a 4 cylinder) One is taking on fuel...the other is exhausting used gases...then another is continuing this cycle.
2006-10-02 21:00:31 · answer #4 · answered by Kenneth S 5 · 0⤊ 0⤋
A lifter is what opens your valves. they are pumped up with oil pressure and serve the same purpose as a push rod int he older engines. All cars with lifters have overhead cam shafts and the lifter is in between the cam and the valve. Hope that helps!
2006-10-02 21:01:24 · answer #5 · answered by Anonymous · 0⤊ 0⤋
In an overhead cam engine, it's possible they have no lifters, just followers.
The followers ride directly on the cam on one side, mount on a pivot point and ride on the valve on the other end.
2006-10-02 21:04:28 · answer #6 · answered by Anonymous · 0⤊ 0⤋
all cars have lifters look at the cam see the bumps see what they rub aginst that is the lifter if you want to learn go to a junk store or yard sale buy a lawnmower that doesnt work take it apart and look its smaller and doesnt have as many of the parts but you will be able to see the cam and valve operation and how the piston works with them
2006-10-02 21:17:10 · answer #7 · answered by mobile auto repair (mr fix it) 7 · 0⤊ 0⤋
an overhead valve setup has no lifters-the cams sit right over the valves its direct-no need for lifters or pushrods-very effective and one of the reasons overhead cam motors rev up more and quicker-no power loss between cam and valves
2006-10-02 21:04:00 · answer #8 · answered by daniel p 4 · 0⤊ 1⤋
Lifters are things in an engine that control the fuel coming in and out. Just a guess. Years ago we had trouble with lifters in a vehicle.
2006-10-02 21:00:50 · answer #9 · answered by ? 6 · 0⤊ 1⤋
over head camshaft is either in the heads or on top of engine. lifters are for opening valves in the head intake and exhaust push rods are for pressing lifters to open valves camshaft operates push rods to operate lifters to operate valves
2006-10-06 18:29:46 · answer #10 · answered by duc602 7 · 0⤊ 0⤋