Service Tips and News

Converting C.C.’s to Horsepower
How do I convert cubic centimeters to horsepower? There is no standard conversion of cc’s (cubic centimeters) to horsepower. The engine design–flathead engine, overhead cam, overhead valve, compression ratio, etc–will have much more effect on the power and torque of an engine then the cc’s. The reason that small engine manufacturers have stopped rating engines used on snow throwers and other smaller pieces of power equipment in terms of horsepower is that this rating was inaccurate and could be manipulated. But in reality a large group of overzealous corporate attorneys created a class action lawsuit to change, or should I say confuse the consumer. Sadly, the only ones who made out well were the money hungry individuals driving the engines of greed. For example, the maximum horsepower for an engine may be when the engine runs at 3600 rpm, but in a particular application, the engine would actually be set to run for maximum torque at 3000 rpm. The horsepower rating at 3600 rpm could be substantially different than the horsepower rating at 3000 rpm . In this case, whichever horsepower rating used (at 3600 rpm or at 3000 rpm) would be misleading and inaccurate as a comparison to other engines or as an estimation of how the machine would perform in a certain application.

Today’s consumers who purchase premium products from reputable manufacturers should trust the manufacturers to design engines to fit the model being designed.

Mower Blade Sharpening                    

A sharp mower blade will always cut your grass the best.  Each season we have customers come in to purchase new blades and bring in their old blades.  The majority inform us they didn’t like the way the grass looks after cutting.  We are aware that because the blades are not easily viewed, they are ignored until the grass looks bad.  We’ll normally recommend sharpening seasonally, but more often if what you cut is harder than grass.  Lappan’s suggests owning two sets, one on the machine and the other sharpened and ready to install.  As an owner of a mower, it’s up to you to know when to sharpen the mower blades and when to recycle them.   You must remember, a mower blade is designed to lift the grass and cut at a high RPM.  A new mower blade has  curved lip, allowing the grass to stand up and be cut.  If that lift is compromised or worn, it time to change. 

Lappan’s offers a blade sharpening  for only $7.00.  Generally, during the season if we’re too not busy, while you wait,  but mostly twenty four hours.

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