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Originally Posted by Tassie f100
What does it achieve anyway?
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Originally Posted by DFB FGXR6
Two fifths of f-all. 
On a mower anyway. In some applications where the engine has to fit a certain space, having one of these to direct the exhaust gas is desirable to prevent blasting carbon all over the machine. These engines power everything from a mower to pressure washers, small ride-on mowers, log splitters ect, so this part allows Briggs to tailor the engine without producing a separate muffler for each machine.
You will see that on some very old mowers which had the engine positioned with the muffler facing the operator, the exhaust plasters the rear of the mower deck with black carbon. Same reason why most diesel cars have exhaust tips facing down to stop staining the rear bumper (hello Hyundai Santa Fe). |
Came across these images of an ancient lawn mower for sale on Marketplace. As you can see, for some reason they orientated these Briggs engines with the muffler facing the operator. As such, the exhaust blows against the back of the deck and turns it black.
That's what muffler deflectors were designed for, to redirect exhaust gasses away from certain areas. In this case, Rover should have paid the extra $1.00 back then to have the deflector on the muffler.
Briggs make a variety of different deflectors. The one above was for the older mufflers with the "pepper pot" outlet, so basically any 148, 158 and 190cc side valve mower engines. The newer ones like I installed are tubular to fit over the more modern round muffler outlets fitted to OHV motors.
https://www.briggsstrattonstore.com/...er-deflectors/