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Category: Troubleshooting & Repair

Created on Monday, 27 September 2010 14:20

Last Updated on Wednesday, 10 October 2012 21:35

Hits: 2355

Everyone has their favorite muffler in terms of the sound it produces. But have you ever wondered how your favorite muffler stacks up in terms of performance? Thanks to Alan of The Stable in San Francisco, you don't have to wonder any longer.

Let's let Alan take it from here....

 

Here are the results of my dyno test of 4 common mufflers used on the 356. The first one is the stock unit with its tail pipes. Second the Bursch street legal system that has the large oval muffler in it. Third the Euro sport system that is just straight pipes with a couple of resonator boxes in it looks very much like the 4 cam "Sebring" system. The last system is the Porsche "sport" type, which has a couple of tail pipes that exit under the body works.

The test motor is a fresh rebuild 1600S, 356A, that is stock except for the NPR pistons and cylinders, Elgin 6607 cam much like a 356C cam, port matching, stock distributor set to 36 degrees max advance. C/R set to 8.5:1.

The test conditions are:

• air temp 57F
• 91 octane fuel
• altitude 277 ft
• humidity 66%
• all results are SAE corrected
• test rpm is 2500>>5000

The results are arranged from top to bottom, with the highest output muffler on the top. The first measurement is foot/pounds of torque and the second is horsepower.

 

Muffler Type	RPM
	2500	3000	3500	4000	4500	5000
Bursch	88.1 - 43.6	90.2 - 53.6	91.3 - 63.3	91.3 - 72.3	88.6 - 79.0	82.7 - 81.9
Eurosport	85.9 - 41.4	88.1 - 51.0	93.4 - 63.1	89.2 - 68.8	84.9 - 73.7	84.9 - 81.9
Stock	85.9 - 41.4	90.2 - 52.2	89.2 - 60.2	85.9 - 66.3	82.7 - 71.8	80.6 - 77.7
Porsche Sport	83.2 - 41.2	85.9 - 51.1	87.0 - 60.3	83.2 - 66.0	75.2 - 67.0	71.4 - 70.8

The Bursch gave the strongest ultimate power but the stock system is very good in the mid range. The Euro system gave good results but is extremely loud. The Porsche sport system was the weakest of all, a surprise, it was very off the mark. The cars I have driven with this system all have seemed "strangled" The Euro system is the weakest at the low end and you expect that from such an open system. Have fun with the data.

Alan
The Stable, San Francisco
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Phone: 415-776-2707

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