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janvos39 · 10-22-2009, 01:38 PM

I think that a primairy pipe size of max 26 mm internal should be used. This size is used on some Honda 500 -4 engines. Sufficient to support 15 HP per cylinder. The length of the primairy is longer for two into 1 muffler than when each pipe has his own muffler. This comes because the temperature is higher in the first case leading to a higher velocity for the pulses.

10-22-2009, 01:38 PM	#12 (permalink)
janvos39 EcoModding Apprentice Join Date: Jan 2009 Location: Belgium Posts: 159 jvsgears - '14 Skoda Octavia Team m8 90 day: 52.47 mpg (US) Thanks: 22 Thanked 38 Times in 28 Posts	I think that a primairy pipe size of max 26 mm internal should be used. This size is used on some Honda 500 -4 engines. Sufficient to support 15 HP per cylinder. The length of the primairy is longer for two into 1 muffler than when each pipe has his own muffler. This comes because the temperature is higher in the first case leading to a higher velocity for the pulses. Last edited by janvos39; 10-22-2009 at 03:00 PM..