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Engine basics => Engine set up tips => Topic started by: Motorman on July 14, 2016, 07:48:43 PM
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Venturi size gets talked about allot but what about the exhaust. Is there a formula for how many and how big to make holes in a tongue muffler? I've got an OS max S 15 side exhaust, the one made after the steel fin and before the FP, and I need to make a light weight muffler for it.
Should I calculate on the area of the exhaust port, copy it or reduce it? Not using muffler pressure but want to cut down the noise a little without loosing power.
Thanks,
MM
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Venturi size gets talked about allot but what about the exhaust. Is there a formula for how many and how big to make holes in a tongue muffler? I've got an OS max S 15 side exhaust, the one made after the steel fin and before the FP, and I need to make a light weight muffler for it.
Should I calculate on the area of the exhaust port, copy it or reduce it? Not using muffler pressure but want to cut down the noise a little without loosing power.
Thanks,
MM
You can use 12 - 5/64th holes, you will still hve good power, and you can tweek it by tapping 4/40 and blocking up 1 or 2, or... opening 1 or 2 holes to a larger size, this will depend on venturie size
Randy