For those who think LCT engines are cheap - Snowblower Forum : Snow Blower Forums
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post #1 of 35 Old 03-06-2019, 10:45 AM Thread Starter
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For those who think LCT engines are cheap

Yesterday, I went to the dealer to buy some parts. In his shop, they were repairing a B&S 305 cc. As I'm always curious, he showed me the parts he had to change inside the motor. The motor had a cam problem. The cam gear is made of PLASTIC press fit on a metal shaft. The cam lobes are even made with PLASTIC !!! I never thought seeing such cheap parts inside an engine. The cam gear lost some teeth. I'm still amazed by what I saw. Unbelievable !
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post #2 of 35 Old 03-06-2019, 11:16 AM
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I don't remember what the other parts are made of. But the Honda EU2000i uses plastic cams, I'm pretty sure. It's an OHC engine, not OHV, if that matters (timing belt, not pushrods like with an OHV).

I'm sure they had their reasons, though it's not my first choice of materials. With that said, they can apparently run for thousands of hours, so plastic isn't the kiss of death, anyways.

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post #3 of 35 Old 03-06-2019, 11:39 AM
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The low end Kohlers are infamous for plastic internals that fail catastrophically. I havenít heard of Briggs with plastic internals but Iím not terribly surprised that the low end engine have all sorts of cheap cost cutting measures implemented.

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post #4 of 35 Old 03-06-2019, 11:49 AM
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The retailers ( big box ) etc want to sell at a certain price point. Hence have to be manufactured to a certain price point. Cutting costs for at least a decent profit. End result disposable JUNK!!
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post #5 of 35 Old 03-06-2019, 11:55 AM
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I've seen them on a B&S vertical but not on a horizontal snow blower engine. I stand to be corrected.
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post #6 of 35 Old 03-06-2019, 12:07 PM
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Not a new idea. Back in another life when I was bending wrenches for Generous Motors they built untold numbers of small block 305/350 engines with nylon or some type timing gears. They lasted a pretty long time. Ford, too, I just found out.


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post #7 of 35 Old 03-06-2019, 12:18 PM
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Originally Posted by micah68kj View Post
Shoot. Nothing new by a long shot. Back in another life when I was bending wrenches for Generous Motors they built untold numbers of small block 305/350 engines with nylon or some type timing gears. They lasted a pretty long time.
They did, 75,000-125,000 miles but the off the market replacement were metal.

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post #8 of 35 Old 03-06-2019, 12:50 PM
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Plastic has been used for a couple of reasons in major engine parts: both less noise than metal on metal and less friction (which means less fuel or more usable power).
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post #9 of 35 Old 03-06-2019, 01:35 PM
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Sorry I will stay with metal and good oil. Plastic BS should only be used on externals, not internals where engine failure would result because of $2.00 worth of plastic.
It brings to mind the bearings that were mfg. with nylon cages that would cause a $3500.00 transmission to fail at 35000 miles or less and was not covered under warranty because it was deemed a wear item, and so many other things.
IT JUST DOES'T HOLD UP.
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post #10 of 35 Old 03-06-2019, 02:05 PM
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Whether cam gears for Ford and Chevy having plastic teeth, the guide adjustors on the cam timing chain on the Ford 4.6 are also plastic. I'm sure there's a lot more plastic parts in engines of makes. With the proper materials and durability they should also last at least as long as metal parts. There will obviously be exceptions to the rule but most are done to a point for both price and durability.

that's my belief and I'm sticking to it.
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