Okay, I know alot of people would benefit from this along with myself.

I just have a couple of questions to ask.

1. What is the definition of the term Duration and Lift?
2. What is valve float?
3. How many rocker arms are in the B-series VTEC motors?
4. How many pins are between the rocker arms?
5. What causes VTEC to engage?
6. What are the criterias that must be met before the engagement of VTEC?
7. How many Lobes are on a camshaft and what are their names?
8. What is the difference between Cam Timing and Engine Timing?
9. What is the job of the Valve Retainer, Valve Springs, and Valve Guides?

LoL...I know this will be so easy for some and difficult for others.

PS. You don't win anything for getting them all right. Just a .

 

http://www.howstuffworks.com/

 

lol,

damn robert you beat me to it! for howstuffworks.com

 

That website is Honda Specific is it?

 

You'd be surprised.. Try "VTEC".

 

1. What is the definition of the term Duration and Lift?

Duration - the time that the valve is open
Lift - how far the valve is opened

2. What is valve float?

When the cam releases pressure on the valve but the valve does not close

3. How many rocker arms are in the B-series VTEC motors?

24

4. How many pins are between the rocker arms?

3

5. What causes VTEC to engage?

ECU and oil pressure

6. What are the criterias that must be met before the engagement of VTEC?

Water temp, oil pressure, speed

7. How many Lobes are on a camshaft and what are their names?

3 - Primary, Secondary, Hi(vtec)

8. What is the difference between Cam Timing and Engine Timing?

Cam timing - timing of cams relative to crankshaft
Ignition timing - Timing of spark relative to crankshaft

9. What is the job of the Valve Retainer, Valve Springs, and Valve Guides?

Retainer holds the springs in place
Springs apply pressure to the valve
Guides "guide" the valve

 

SGT gets a lollipop!

 

man, sgT just passed the class. nice answers.

 

to Sgt for that thoroughly informative breakdown.

 

SGT, I thought there were only two pins between each set of Three Rocker Arms. It's only in the new system in the Odyssey that uses the Two Rocker Arm set and one pin. I might be mistaken.

ILR, who goes to check his Import Service Magazine.

 

****, he gets more than a lollipop, give him an A in Honda 101

 

3 rocker arms. 3 pins.
one has a spring behind it and may be hard to remove.
The other two just fall out if given the chance.

 

LoL...I was questioning you there for a second, but once I reread the book, I noticed that we were talking about different things. My apologies for mistating the correct term used for the part.

It is called a piston that goes in between the three rocker arms. Like a three layered sandwhich with your rocker arms being your bread and the two pistons being the ham, cheese, turkey...you get the point. Thus the name three-rocker, two-piston system. Instead of the Odyssey's new system of two-rocker, one-piston system.

Agan I apologize for the mistatement. Pistons not Pins.

 

I'm not picking an arguement with you SGT just spicing up my post.

You mention that there is three lobes. With Primary, Secondary and Hi(VTEC).

I've read elsewhere, that the center lobe is the High RPM Lobe and the two that is beside it is the Low RPM Lobes. With that said, there are three lobes, but technically the outer Lobes are identical thus basically they are the same. So wouldn't there only be two sizes of cam Lobes? High RPM and Low RPM?

 

Sorry I'm doing alittle post-whorring here...

So which lobe is Primary and which is Secondary? The Low RPM Lobes are Primaries and the High RPM Lobes are Secondaries? Or vice versa?

 

There only one question I would like answered...

What keeps the valve from dropping into the cylinder? I always thought the retainer did this.

Thanks

 

Techincally, its the retainer/keeper/spring combo.

Spring provides pressure, retainer holds the spring, and the keepers hold
the retainer onto the valve stem. Keepers may also be called valve locks.

 

Piston, pin whatever you want to call it. I suppose you may not count the third
as it goes farther into the rocker to allow the other two movement.

The HI cam is the middle lobe.
The outer two are the primary and secondary and they are not the same.
One is ground differently than the other with different lift and timing to
promote swirl at lower rpm. Only in the case of Toda B and C will the pri/sec
lobes be identical.

 

Thanks SGT...those two guys that recommended how stuff works.com didn't tell me they leave out little details like Primary, Secondary, and Hi Lift Lobes...

The site just called the two outer lobes the low RPM lobes and the center High RPM Lobes. See, I told you there are some things that howstuffworks doesn't know.

 

Maybe there Should be an HT Game show "Stump Steve Sakai" I Dont think many people could though

 

Hehehe...I'm working on it...

 

What is Valve Overlap and when does this occur?

 

who is steve sakei??

ahhh, perhaps you mean sakai

 

Overlap occurs between the time the exhaust valves close and the intake valves open. The amount of time that both int and ex valves are open is the overlap.

 

Ok Ok, why is overlap so important?