Formula 4 design of CNG Mixer

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Formula 4 design of CNG Mixer

Hi,can any body send me the formula to design a cng mixer according to venturi size?

Gari.pk User 2364 asked on 25 Jun 2010 15:57:20 pm

1 Answer

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Rayan - on 25 Jun 2010 15:57:29 pm

Hello!
its basically depends on carby bore...........800cc-1600cc cars got different type of carb....so it depends on carb.....mostly its 70% of the carb bore.....like if carb got 68mm bore so it must be of around 48mm from inside for air pass out.......thats the basic or can say simple formula of venturi design.......rest is all CNG.......set out the mixture where engine idles best.........
as petrol makes best of 14.7:1.....CNG needs around 17:1 ratio to make perfect combustion....
Thanxxx