Testing my muffler sytem?

[Doodle Bug]

Posted: Fri Dec 14, 2007 8:55 am Post subject:
One of the best ways to make your exhaust quieter is to add at least 30 inches of
pipe behind your mufflers. Adding suppertraps to mufflers can cause too much
back pressure. GM recommends not to exceed 2 inches of back pressure. Our
cross-under exhaust using a resonator with a twisted baffle under the engine and
mufflers mounted to the transom only produced 1 inch of back pressure. A back
pressure tester can be purchased from most local auto parts stores. probably
under $ 100.00. Mine is made by Star Products, part # TU-24A Three Way Exhaust
Back Pressure Tester. It is a must if you are going to design an exhaust system.
With the suppertraps, you will probably have to add plates until the back pressure
drops just below 2 inches. I have never tested suppertraps. CHUCK


I’ve always wanted to know how to check my muffler systems to see if it is hurting my performance. After reading Chuck’s information, I now have a new question. I do not want to buy a back pressure tester (BPS) because I will be only be using it one time.

I was thinking if I removed my mufflers at the inlet for a short time; would I hurt my engine? I remember someone telling me the cold air would warp my valves.

What is the best way to test a muffler system on a Chevy 350 S.B., with 2- Flowmaster 3” inlet, dual 2” outlet muffler?

Would I be better off buying new mufflers, if so, which ones?

 

[scottginfla]

don't have an answer but great idea

 

[chuckitt@earthlink.net]

Hey Moose, Running your engine for a short time for testing want hurt it. Call some
of the local muffler shops to see if they can do a back-pressure test for you. If so
have them stay clear of the prop. CHUCK

 

[Doodle Bug]

In looking up the information on the Star Products TU-24a. I found it is a 0-8# gauge. That for around $50-$65.

Three Way Exhaust Back Pressure Kit
• This THREE way tester allows quicker and more accurate testing of exhaust blockages in catalytic converters, mufflers, etc.
• Oxygen Sensor adapter includes M12 & M18 thread. Flange and gasket also included for cars with flange-type oxygen sensors.
• To test thru the Exhaust Pipes, threaded inserts, and installing tool, sealing screws & washers are included. Testing can be done on either side of catalytic converter and muffler to pinpoint blockage.
• For testing thru the Air Injection System four rubber adapters and quick coupler plugs are included to use at the air injection pipe inlet fitting.
• Special Gauge has two multi-colored bands-idle and 2500 RPM, with pressures shown in PSI and bar.
• Hose is 6 feet, enough length for the Technician to test from the drivers sea.


If you are testing thru the Air Injection System, why can’t you use a vacuum gauges?