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Old 04-15-2011, 07:07 PM
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morgaj1 morgaj1 is offline
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Plastic Cams

I have heard that all of the Stihl 4-mix engines use plastic cams. Is that true? Does anyone know if the Shindaiwa C4 engines use plastic cams?
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Old 04-15-2011, 07:48 PM
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alexschultz1 alexschultz1 is offline
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really? where did u find that out
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Old 04-15-2011, 08:00 PM
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morgaj1 morgaj1 is offline
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I read it on another forum. I doubt that it is true, but wanted to ask some of you guys that are running Stihl 4-mix.
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Old 04-15-2011, 09:29 PM
LCPullman LCPullman is offline
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I'm going to make a guess and say that they may have plastic cam gears, but the cam itself definately isn't going to be plastic.
Somewhere here someone posted a picture of a BR600 engine disassembled, but I'm not sure where.
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Old 04-15-2011, 10:07 PM
fatguy28 fatguy28 is offline
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i dont know man i have a sithl 4mix used the crap out of it still runns like the day i got it
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Old 04-16-2011, 12:21 AM
LCPullman LCPullman is offline
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Actually it is a plastic cam - here's the pictures

http://www.lawnsite.com/showpost.php...2&postcount=26

I don't think there is anything wrong with a plastic or may be we should say composite cam. The fact that they run well just or many many hours just demonstrates that it works reliably.
BTW - I know Kohler had plastic oil pump gears in at least some of their commercial engine.
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Old 04-16-2011, 07:08 AM
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Georgia Lawn Works LLC Georgia Lawn Works LLC is offline
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Talk about reducing rotating weight on the assembly huh?
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Old 04-16-2011, 10:31 PM
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ed2hess ed2hess is online now
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We bought some of these last year and it will definitely be the last 4-mix we buy unless they stop making 2 stroke. Engines held up fine but difficult to tune and NOBODY in the crews want to use them due to vibration I think caused by steel shaft. Speed heads also rattle around when they get worn and contribute to vibration
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Old 04-16-2011, 10:37 PM
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morgaj1 morgaj1 is offline
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Thanks for the pics Ed. The Shindaiwa setup definitely looks more robust.
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Old 04-16-2011, 10:41 PM
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morgaj1 morgaj1 is offline
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I also like how Shindaiwa uses and overhead cam design as opposed to the push rod overhead valve Stihl setup.
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