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Hit & Miss Gas Engine Discussion

Surprising results from lawn mower engine speed test...


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  #1  
Old 08-27-2011, 01:10:41 PM
Skandia600 Skandia600 is offline
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Arrow Surprising results from lawn mower engine speed test...

I have a summer job- mowing my grandpa's lawn. He has 2 riders, a Craftsman & an MTD Yard Machines twin bladed 42" deck, and a very old Toro Recycler push mower with a Tecumseh engine. The Craftsman has a single cylinder Briggs & Stratton 13.5 horse I/C engine, and the MTD has a twin Briggs 17 horse I/C engine. I have always noticed that the Craftsman has run quite fast, even while idling at lowest throttle. So, I guessed that it ran around 2k rpms on full throttle. To accurately test this, I ran to Harbor Freight with my grandpa and picked up a Cen-Tech photo tachometer. It is pretty cool, and quite accurate. To test the engine's speed, I placed a small strip of reflective tape on the flywheel, started her up, and tested the speed. My results- approx. 1468 rpms on low throttle, 3500+ on full. So, my guess was pretty close. I was quite surprised at the speed, didn't really expect that many rpms from such a big engine. I haven't yet tested the others, but plan to soon.
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Old 08-27-2011, 03:35:59 PM
BobRR BobRR is offline
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Default Re: Surprising results from lawn mower engine speed test...

There is a forum on here just for small air cooled engines,lawn mowers and maytags. Bob
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Old 08-27-2011, 05:48:09 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Surprising results from lawn mower engine speed test...

Most small engines are rated at 3,600 RPM. Most are capable of safely reaching 4,000. Late model B&S engines were de-rated to 3,450 RPM due to the fact that they have reached the limits of their design. At 3600, they are exceeding stress limits.

If it's speed you want, try a chain saw! They can turn up to 22,000, depending on model!

Andrew
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Old 08-27-2011, 11:38:18 PM
Skandia600 Skandia600 is offline
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Default Re: Surprising results from lawn mower engine speed test...

Ya I was impressed but there's a reason for high rpms and torque due to the fact that the one cylinder needs to run EVERYTHING on the lawn mower, and I suppose its design allows.
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