Exhaust pressure in 2 wheelers

Hai,

I want to know the average pressure in exhaust mufflers of 2 wheeler automobiles at rated rpm.

With Thanks & regards,
Amit

 

[GregLocock]

Backpressures of around 0.6 psi ahead of the cat at full power are regarded as acceptable by our engine people (they aren't happy about it). I think about 1/3 of that is in the cat, and 2/3 in the mufflers. Most of the muffler loss is required to get good subjective acoustic performance, rather than meeting the noise regs.

Cheers

Greg Locock

 

Hai Greglocock,
Thanks.

I have concern about the reply. When I converted the 0.6psi in to bar, it came around 0.04bar(I have taken it as absolute pressure).The atomospheric pressure itself is approximately 1 bar. How the pressure in exhaust muffler can be less than atomspheric pressure. If it is less it may act as suction.
Please excuse me, If i understood things wrongly and then asking a question in completely wrong way.

I can't get cat. What is that cat?


With Regards,
Amit

 

[TheBlacksmith]

I'm pretty sure Greg meant 0.6 psi gauge, which is atmospheric plus 0.6 psi or 15.3 absolute.

Blacksmith

 

Hai blacksmith,

Thanks for the clarification.

Cheers,
amit

 

[Skunkwerkes]

The "cat" he's talking about is the Catalytic Converter,. a series of ionizing screens that convert gases. Mandated for all cars to meet emissions regulations.