Aries Limited
16 West Jackson Street
Medford, OR 97501

Phone: 650-279-6609
Email: Sales@amuffler.com

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Backpressure Comparison Chart

Muffler Type

Miles Per Hour

Engine RPM

Backpressure

$50 Facsimile

40
45
50
55

1500
1700
1900
2000

10 oz
32 oz
46 oz
54 oz

Early Jobber
(no longer available)

40
45
50
55

1500
1700
1900
2000

2 oz
4 oz
10 oz
16 oz

Non-Tapered
4" Diameter

40
45
50
55

1500
1700
1900
2000

0 oz
6 oz
10 oz
16 oz

Aries Reproduction
Tapered Muffler

40
45
50
55

1500
1700
1900
2000

0 oz
6 oz
12 oz
12 oz

 

The road tests were performed by Doug Windrem of Ontario, Canada. All tests were performed on a level road at an altitude of 1,000 feet. The temperature was 75 F. on a clear sunny day. The tests were actually performed using a 1928 Model A Phaeton. An extra length of special piping was installed between the exhaust manifold and the muffler to be tested (see photo). It was here that the back pressure gauge was attached. The mounting point of the tail pipe was also lowered so a correct fit could be maintained without leakage.

Two people rode in the car, one driving and one taking readings on both the "Snap On" brand tachometer and the pressure gauge. The pressure gauge is manufactured by O. T. C. Division, SPX Corporation, Owatonna, MN 55060, tool part #7215 and is specifically designed for testing back pressure on automobiles. The speedometer was also calibrated and tested over the test speeds and found to be accurate within one mile per hour.

Backpressure Gauge Test Setup
 
Last Updated: 12/19/2015
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