Plastic Camshaft?

Joined
Jul 6, 2011
Messages
60
I see some of the 4 stroke engines utilize a polymer or plastic camshaft.
How are these holding up?
Seems like a bad idea to me.
Any thoughts?
 


Old Bob

Member
Joined
Dec 28, 2008
Messages
472
I wouldn't worry about it, I don't keep track of hours, but these things on trimmers last virtually forever.I've never seen one wear out. The GX31 I bought 14 years ago is still running.
 

jaguar

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Joined
Nov 25, 2010
Messages
3,453
I think Honda designed it for less pressure on the camshaft lobe which is easier to do on a small engine.
 
Joined
Jul 6, 2011
Messages
60
This just seems like a horrible idea.
I spent a good portion of the day researching, and just as I thought, they fail all too soon.
Horrible idea for longevity .
The only good thing is they are cheap and quiet.
Briggs, Kawasaki, Honda, and probably a lot more mfgs. are going this route.
Sad.
 

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gary55

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Nov 27, 2012
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2,923
If I was going to worry about something on that cam shaft it would be the gear.
 
Joined
Jul 6, 2011
Messages
60
This is a cam removed from a newer Briggs.
It seems that other manufactures are following suit.
Quiets the valvetrain operation, but shortens the life as well.
Moral of the story.....BAD IDEA!
 

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Old Bob

Member
Joined
Dec 28, 2008
Messages
472
I knew it wasn't a Honda part.
That cam is from an engine size that's not legal to run on a MB.
So why bother with it here, this a MB forum.
Moral of the story is that you are second guessing companies with an engineering dept that better funded than you are.
 
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