What keeps Guzzi pushrods straight?

[SmithSwede]

I really need to take apart a small block and figure this stuff out.

What constrains the movement of the pushrods?  What keeps them from flopping around laterally?   Is there some sliding bearing somewhere is the push rod tube to ensure that the rod just moves straight up and down as it follows the cam contour?

[oldbike54]

 Well , we could take your V7 apart at CV and show you 

 Really , the push rods aren't flopping around on the cam , but on the followers 

 Bud , are you bored today ?

 Dusty

[oldbike54]

 Uh , whatever Kirby said 

 Prescott , there is a cup on the rocker end of the pushrod that runs in a ball on the rocker , the cam end has a ball that runs in a machined cup on the cam follower . If you have ever removed an airhead pushrod and heard the pop as it disengaged from the follower this would all make sense . Guzzi pushrods do the same thing .

 Dusty

[SmithSwede]

Thanks, that makes sense.  I've seen the little cups, but wasn't sure if that was all there was.

I'm not bored today, just extra special curious.

[rodekyll]

Internal case pressure.    EVERYBODY knows that.   

[jcctx]

SEXYrocker arms!!!!!!

[rodekyll]

MUCH better thn mine!   

[tazio]

Bad hair day?
Use your pushrod comb!!

[mtiberio]

Compression stronger than tension.

[Triple Jim]

Hooke's Law & Young's Modulus...keeps things straight.

:-)

I think Euler deserves some credit too.  :)

[oldbike54]

 Keebler Elves ??

 Dusty

[Tom H]

Keebler Elves ??

 Dusty

 :1: :1:

But maybe an Italian super model

Sorry
Tom

[oldbike54]

:1: :1:

But maybe an Italian super model

Sorry
Tom

 Good one 

 Dusty

[Sasquatch Jim]

morals.

[Arizona Wayne]

Depends what year small block Guzzi you're referring to.  How many miles on it's odometer and if it's a 4 valve Lario or not. 

[beetle]

Not only are they straight, they're also narrow.

[tris]

Keebler Elves ??

 Dusty

I had to Google that one 

[John A]

Rev limiter

[chuck peterson]

 

Lead in their pencil?

 

[oldbike54]

I had to Google that one 

 All this time I thought the Keebler Elves were Yorkshiremen 

 Dusty

[Tobit]

Rev limiter

 

But I appreciate the Hooke's law and Euler references.  Gives me something to read tonight.

[oldbike54]

 The OP's question was a bit confusing . Seems he wasn't asking what keeps the pushrods from bending , rather what keeps them from flopping about . Two different questions .

 Dusty

[rodekyll]

That makes sense.  Nobody likes a floppy pushrod.

[oldbike54]

Oh, that would be spring pressure....not to be confused with peer pressure.

:-)

 Once again , not quite what he was asking . The OP has a degree in fisics  His question was what actually hold the pushrods in place . The answer is the ball and cup present on both ends .
 Hey Kirby , what is the term for the sticky situation created by the oil present in the aforementioned ball and cup ?

 Dusty

[oldbike54]

 Ugly ?

 Wasn't trying to be snarky , just that sometimes it takes one of us , er , less intelligent guys to decipher a question .

 Dusty

[Triple Jim]

 

But I appreciate the Hooke's law and Euler references.  Gives me something to read tonight.

If anyone really looks up Euler, he did a lot of stuff during his life.  I was referring to his work in estimating the load a column can support before it buckles, now referred to as the Euler buckling load, among other variations.

[Muzz]

  Hey Kirby , what is the term for the sticky situation created by the oil present in the aforementioned ball and cup ?
 Dusty

I would have thought simple suction Dusty. They are probably machined close enough that capillary forces come in to play as well.

[twhitaker]

That suction sound is because nature abhors a vacuum.

[Muzz]

That suction sound is because nature abhors a vacuum.

So do I. 'Orrible noisy things, always need emptying.

[SmithSwede]

Ok, thanks. 

As Aristotle noted, "horror vacui," or as the medievals said centuries later, "natura abhorrent vacuum."

So anyway, I get-eth oil in mine cups of my pushrods, on both the cam and the rocker end.   Straight and narrow and moral are thy pushrods kept, with capillary action leading them not into temptation to stray into crookedness.

I'm still wondering about the Coriolis effect and how that could create a torque abscess that might lead to quantum proton tunneling. 

Say, has anyone else noticed it's cold and wintery?