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Old 07-03-2012, 10:25 PM
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piston slapper piston slapper is offline
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Originally Posted by OldLawnMowerMan81 View Post
BBC = blade brake clutch

Thanx...I honestly didn't know what that meant....
The first day I worked in a mower shop....they started me on commercial mowers...and never looked back.....
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Old 08-29-2012, 06:08 PM
OldLawnMowerMan81 OldLawnMowerMan81 is offline
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The next time my dad tinkers with the engine, this time I hope it will read 3000 RPM on the TinyTach (this without the BBC engaged). When I then engage the BBC, it should read 2850-2900 RPM.

To get a realistic idea of the actual blade tip speed of your mower with the BBC engaged, subtract at least 100 RPM from the manufacturer's stated no-load engine RPM.

For example, if a Honda GXV140 engine on a BBC-equipped HR215SXA mower is turning 3100 RPM without load, then when you engage the Roto-Stop (Honda's terminology for BBC), the engine RPM should then amount to up to 3000 RPM.

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Old 08-29-2012, 06:32 PM
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BigFish BigFish is offline
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You, in fact, want to adj. the top rpm's with the blade rotating it's the only way to get an accurate reading.
The blades being engaged is not considered a load. It is a parasitic load, and should be accounted for when setting the top no load speed, which, by the way can be set to any rpm you want on your personal mower. I like to keep my unit at 3500 or so.

Blade tip speed/ rpm charts based on blade length/ cutting dia. are online.
It ain't rocket science! far.

'Course if yer house has more wheels than yer truck...
" Old age ain't for sissies "
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Old 09-02-2012, 05:36 PM
OldLawnMowerMan81 OldLawnMowerMan81 is offline
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Have you ever tried to determine the factory high speed setting by determining the overall tension of the spring?

Also, what kind of loaded (blade turning) and no-load (blade not turning) speeds do you get on your Toro TNT100?

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bbc , mower , speed , toro

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