Lift - what is it?

[Gen6GT]

OK, a noob type question, forgive me but I've never driven a Gen 7. All this talk about lift and lift bolts, what exactly is it, how does it work and what does it do?

[sh3p]

just a quick search & only copied & pasted would have taken me forever to try & explain & would have probs ended up more confused than you

enjoy the explanation

Cheers Shep

HOW DOES LIFT WORK???

Toyota's Variable Valve Timing and Lift (with intelligence)

The VVT-i portion of the system continuously varies intake valve timing throughout the rev range by hydraulically rotating the camshaft relative to its drive gear. Note that VVT (without the "i") did not do this continuously. The VVL portion of the system is similar to Honda's VTEC system, incorporating two distinct cam profiles. However, the actual mechanism is quite different. Both cam lobes operate a single wide rocker arm that acts on both intake or both exhaust valves. A needle-bearing roller on the arm follows the low-rpm, short-duration, low-lift lobe, forcing both valves to open and close on that profile. The roller design and roller bearings on the rocker arm pivot help to minimize valvetrain friction. The high-rpm, higher-duration, longer-lift lobe rubs on a hardened steel slipper follower mounted to the rocker arm with a spring. Even though the high-rpm lobe is pushing down further than the low-rpm lobe, the spring absorbs the extra movement. At 6000rpm, the ECU sends a signal to an oil control valve at the end of the camshaft that puts oil pressure behind a lock pin in the rocker arm, sliding the pin under the spring-loaded slipper follower, locking it to the rocker arm and forcing the arm to follow the high-rpm cam profile.

[Dan23]

Basically that explanation sounds more impressive than it actually is

[rpsmith79]

It's basically like having 2 different cam profiles fitted to one engine, a normal everyday cam, and a hot cam, and the hot cam is only used above 6000rpm (or whatever the lift point is)

If you just fitted a hot cam to a normal engine, you have have less power and torque at lower revs and it would probably idle very lumpy, so this system is the best of both worlds

[Steve92Blade]

I typed in 'Hot Cam' the the search engine to see what you meant, It was nothing to do with cars what so ever, .... still interesting though

[dublet]

It takes you from one floor to another in tall buildings.

[Liam 190]

It gives you a surge in power at about 6200rpm to about 8200rpm...

[rpsmith79]

I typed in 'Hot Cam' the the search engine to see what you meant, It was nothing to do with cars what so ever, .... still interesting though

Ha ha ha, i'm at work, so i won't be trying that

[Brendan]

Lift? It takes you from one floor of a tall building to another.

Oh and its also something akin to V-tec and about as impressive, loads of noise in a rev range you wouldn't normally use, all to gain some BHP and very little torque. Its kind of like turbo lag but with out the performance, so pretty pointless really IMO.

[sonic]

isnt lift what 140 owners need when there engine runs out of oil ?

[bazz54]

When I was a boy in Yorkshire, you'd look at your mate's MK I Escort and demand, "'As tha got t'igh lift camshaft in that?". T'igh lift camshafts made it good for competition, much less good crawling thro traffic.

The 190's "lift" is just the latter day version of that but achieved by gizzmos (quite similar gizzmos to the ones Honda developed..... ) Most importantly, lift gives you both performance and driveabilty!