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Old 01-03-2013, 06:29 PM   #1 (permalink)
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Questions about engine internals ...

I'm making a CAD model of a 60 degree v-twin air cooled engine. I have never taken apart an engine, and I don't have one sitting here that I can take apart and measure, so I'm making this up as I go.

In a Corvette, how is the top of the pushrod connected to the rocker arm? Okay, maybe "connected" is the wrong word, but what is the geometry of the top of the pushrod that contacts the rocker, and what is the geometry of the rocker to accept the pushrod? Is this just a "ball" connection?

And, is the bottom of the pushrod hard fastened to the lifter, or does the valve spring keep them connected?

Thanks for any help.
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Old 01-03-2013, 07:24 PM   #2 (permalink)
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Re: Questions about engine internals ...

Both ends of the push rod are convex. The rocker arm has a concave shape where the push rod seats. The top of the lifter also has a concave shape to accommodate the push rod. The pushrod floats between the lifter and the rocker and isn't fastened. It's kinda trapped.

Pic of the top of the lifters.


Rockers.


Push rod
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Last edited by PerforminNorman; 01-03-2013 at 07:32 PM.
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Old 01-04-2013, 04:29 AM   #3 (permalink)
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Re: Questions about engine internals ...

Thanks Norm.

In the photo of the rocker, it looks like small ball bearings inside the cup for the lifter, is that what I'm seeing?

Last edited by proexpert; 01-04-2013 at 04:36 AM.
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Old 01-04-2013, 07:44 AM   #4 (permalink)
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Re: Questions about engine internals ...

Quote:
Originally Posted by proexpert View Post
Thanks Norm.

In the photo of the rocker, it looks like small ball bearings inside the cup for the lifter, is that what I'm seeing?
Optical Confusion. LOL I think that's just a reflection that looks exactly like bearings.
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Old 01-04-2013, 08:08 AM   #5 (permalink)
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Re: Questions about engine internals ...

Thanks again. I have a first draft of this complete. The block and heads still need alot of work, but the rotating assembly and the valve trains are connected and working. The timing is not correct yet, the cam also needs work.

http://www.youtube.com/watch?v=Sr3dl...ature=youtu.be

Last edited by proexpert; 01-04-2013 at 08:25 AM.
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Old 01-04-2013, 04:14 PM   #6 (permalink)
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Re: Questions about engine internals ...

Very cool.
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Old 01-04-2013, 08:12 PM   #7 (permalink)
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Re: Questions about engine internals ...

A better video showing the valve train. I really need to get a life.

First draft of V twin engine model - Creo Parametric 2.0 - YouTube
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Old 01-07-2013, 06:36 AM   #8 (permalink)
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Re: Questions about engine internals ...

Pretty cool Steve!
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