What keeps Guzzi pushrods straight?

[oldbike54]

 Of course Aristotle didn't know that less than .01% of nature is anything more than a vacuum 

 Dusty

[Guzzistajohn]

I always thought a naked Ducati kept a Guzzi's pushrods straight?

[Kiwi_Roy]

It was a good question.
I thought Hooke was all about the extension of a spring with load.
I can still quote Hook's Law as taught by my Physics master Spider Webber 50+ years ago
I got some homework to do

[Zoom Zoom]

You guys are putting way to much thought into this.

They're not made out of cardboard or another paper derrivitive. It is all really simple.

ZZ

[Triple Jim]

BTW 98% of the world drive on the correct side of the road...go figure!

That sounds about right, or maybe a little high.  I'd say at least 2% of the cars I see are across the center line when I'm on a curve.

[John A]

to get  back on the rails, when I said the rev limiter kept the pushrods straight I was mostly joking. I've never bent a pushrod on a big block by over revving it. I bent an intake pushrod when an errant piece of aluminum from porting jammed the valve. when I got done with that engine I could wind the needle off the tach and never bent a pushrod. Other big blocks I haven't experienced a bent pushrod.I use aftermarket pushrods, never had an end come loose on one of those. stock pushrods sometimes loose a tip but I always caught that by extra noise. the original post was about a smallblock and I haven't gone  wild on one of those, yet. so I was wondering if you guys that hop up smallblocks bend pushrods? remember if you're not breaking parts you are not putting out enough power

[oldbike54]

 Kirby , I have no idea what you are apologizing for ? Being an engineer ? Pretty sure that isn't a crime  Like you , I was attempting some humor directed at engineers . Probably missed the target 

 Dusty

[Tom H]

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?

OK...

I'm not an engineer.

On a big block like my Ambo and Eldo there is a lifer that rides on the cam that has a cup in it for the push rod to sit in. Then on the rocker end there is a ball that sits in the cup on the push rod. My best guess is that the tension between the valve spring/rocker assy. and the lifter is what keeps the push rod from coming loose from those parts.

Hope this helps, but the topic was fun
Tom

[oldbike54]

No you didn't miss a thing!

Should of put in more than just a couple of faceless/obscure names. You pop?? music fans are always calling out names that I have never heard of!!

Its all good.

:-)

 I feel the same confusion when folks start discussing movie dialogue 

 Dusty