Should valves really tick when too tight?

[Fivizzz]

Okay, so, before I go any further here's my understanding of the logic behind valve tuning. I may be wrong, making my question irrelevant but at least I'll have learned something.

[To me] Valve tuning is basically just about setting how far the valves open into the combustion chamber.

The further they open, the quicker (and thus, the more) the air/fuel mixture gets in, leading to better performance.

Too loose, and they open too far into the chamber, getting hit by the piston as it reaches its topmost position. Hence the ticking sound.
Too tight, and they don't open far enough, not allowing enough air and fuel into the chamber for combustion. Hence the stalling.

Considering valves are mounted on a spring that holds them closed when not pushed opened by the camshaft, their contact with the cylinderhead is no cause for ticking, since it's how they're designed to operate.

So I have trouble understanding why too tight valves would tick since they're ever further away from hitting the piston than if they were properly set up.

[Tim1]

Early Access to valves tick when too tight

[a basic bitch]

I think its a concession to the fact we're playing a video game, not real life.

[zlatanfish]

Originally posted by Tim1:

Early Access to valves tick when too tight

[Risto Reipas]

I'm not expert but will give it a shot.
First, there might be mix use for loose/tight. Depending on what end of valve stem you are looking. I think loose/tight should point to contact between rocker arm and valve stem.
Since those screws we tune are used to offset angle of rocker arms. For making valve stem sit tighter to seat would require spring change.

Anyway possible reason for ticking. When rocker arm is too loose, valve stem ends it's closing movement before rocker arm. This makes rocker arm lose contact to stem. And so instead of smooth pushing movement, rocker arm will hammer it.

[FULL METAL JACKET]

Thats not what valve adjustments do in real life.
In the engine model used in this game, you would be adjusting the clearance between the rocker arm and the valve itself. There are other types of valves assembly, some of which dont even have an adjustment at all.
In real life we use a tool called a feeler gauge to measure this gap, set it properly and tighten the bolt, basically.
Too tight and the valve will not seal properly (or even stay opened when it shouldn't), too loose and the valve will not open to its fully and in some cases it will also make a ticking sound, causing a number of problems.
Also, intake and exhaust valves usually are set with different clearances.

This is what it looks like irl
]http://www.georgebelton.com/6g.civic.tech/valve.clearance/valve.clearance.022.jpg

So, no. In real life valves will not tick when too tight. Engine will backfire, have idling issues, loss of power and so on.

In game tho, thats all up to the devs on how it should work.

[Fivizzz]

Thanks guys,that's exactly the kind of answer I was looking for.

So yeah, my interpretation of it was wrong. I'll go to bed a little less stupid tonight ;)

[Dayemon]

Well the other thing is how would you know if you were too tight in this game if there wasn't an audible tick?

[MrVein]

Originally posted by Dayemon:

Well the other thing is how would you know if you were too tight in this game if there wasn't an audible tick?

you would know because you would not get proper power out of the engine.

Originally posted by full metal jacket:

Thats not what valve adjustments do in real life.
In the engine model used in this game, you would be adjusting the clearance between the rocker arm and the valve itself. There are other types of valves assembly, some of which dont even have an adjustment at all.
In real life we use a tool called a feeler gauge to measure this gap, set it properly and tighten the bolt, basically.
Too tight and the valve will not seal properly (or even stay opened when it shouldn't), too loose and the valve will not open to its fully and in some cases it will also make a ticking sound, causing a number of problems.
Also, intake and exhaust valves usually are set with different clearances.

This is what it looks like irl
]http://www.georgebelton.com/6g.civic.tech/valve.clearance/valve.clearance.022.jpg

So, no. In real life valves will not tick when too tight. Engine will backfire, have idling issues, loss of power and so on.

In game tho, thats all up to the devs on how it should work.

listen to this guy! he knows it

[thescaryone]

In-game having your valves too tight ticks because I think the rocker doesn't get to rest on the cam anymore. You hear it click as the cam hits the rocker arm. And too tight does cause backfires as you let combusting gas out of the exhaust.

[ChyonE]

how do i get my car to the mechanic
it wont start its being a ♥♥♥♥♥ to tune the rockers

[Monolith]

Originally posted by Rucak:

how do i get my car to the mechanic
it wont start its being a ♥♥♥♥♥ to tune the rockers

You can take the poop truck, then attach the car to the poop truck with the towing hook and tow it to the mechanic that's how i did it

[joridiculous]

Since you can't measure the gap between valves and rocker cam, you have the ticking sound on both "tight" and to open (lose).
Also simulation of how engine runs / dont run is simplified. Thankfully :)

[NGineus]

Full metal jacket gave a good explanation on how the valve are adjusted, but he is wrong on the point that the valve does not tick. Valves does a ticking sound when are not set properly, and here is why.

In a pushrod engine the valve and the rocker are close but does not touch between them, and this is what the gap measurements is for, now if you set a valve in a wrong way that is different to the other valves, what happen is that, that single valve will close faster or slower then the rocker, so the rocker will just kick the valve down doing a tick sound.

It's hard to explain, but the game is quite real, not at all, but quite.

Imagine that you have set all the valves in a real car and all the rockers and everything work fine.

What is happening is that the valve and the rockers are going up and down togheter.

So what happen when a single valve close faster then the others? It just does not go, always (infact in the game, this part is realistic, the sound is not tic.tic.tic. but more like tic.tic---tic-tic.tic) in armony with the rockers, and that's where the ticking sound comes out.

[FULL METAL JACKET]

Originally posted by NGineus:

Full metal jacket gave a good explanation on how the valve are adjusted, but he is wrong on the point that the valve does not tick. Valves does a ticking sound when are not set properly, and here is why.

In a pushrod engine the valve and the rocker are close but does not touch between them, and this is what the gap measurements is for, now if you set a valve in a wrong way that is different to the other valves, what happen is that, that single valve will close faster or slower then the rocker, so the rocker will just kick the valve down doing a tick sound.

It's hard to explain, but the game is quite real, not at all, but quite.

Imagine that you have set all the valves in a real car and all the rockers and everything work fine.

What is happening is that the valve and the rockers are going up and down togheter.

So what happen when a single valve close faster then the others? It just does not go, always (infact in the game, this part is realistic, the sound is not tic.tic.tic. but more like tic.tic---tic-tic.tic) in armony with the rockers, and that's where the ticking sound comes out.

Valves will not "tick" when the gap is set too tight, in real life. Doesn't matter if it is a push rod type engine or not.

Again, in game, that's totally up to the developer.