Muffler Performance - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 06-30-2013, 02:17 PM Thread Starter
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Muffler Performance

Being that A LOT of guys and gals with their diesels are using them for work stock pulling etc or stock drag racing classes amongst regular everday driving are looking for more power or just plain better reliability with running a full system.

How many companies are there that offer mufflers for stock and performance? If you have to run a muffler why shouldn't we look for the best ya know. I wonder if Cherry Bomb makes a large enough inlet & outlet for diesel trucks?

Dynomax, Magnaflow, Flowmaster and Gale banks to name a few. Off the top of my head Dynomax is the only one I have seen provide flow capacity for their product. Some others may be joining that bandwagon however I am not aware of it if they have, whoever they may be.

I have used Flowmasters before, didn't believe the did any thing bad, they made the engine sound nice. As far as flow I didn't pay attention enough to that.

Anyone who has bought just mufflers or half-systems etc etc post up what you have found on your application! What happened to your performance level?

Here are some pictures of a standard Donaldson 5" inlet and 5" outlet muffler used on big rigs for some thought provoking.
Inlet:

Outet:

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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post #2 of 10 (permalink) Old 07-01-2013, 10:09 AM Thread Starter
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I think it may be fitting to put David Vizard's opinion on flow of a muffler on engine output.

He says per 1 horsepower you should have 2.2 CFM of muffler flow.

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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post #3 of 10 (permalink) Old 07-02-2013, 10:17 AM Thread Starter
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Anyone put an entire Magnaflow system or Banks system on or other? Street truck or racer.

Anyone's opinion is welcome since I started this to help anyone decide on buying from the input of others if we actually get this thread moving. Everyone have a great 4th of July! I will be busy for a few days. Be safe!

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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post #4 of 10 (permalink) Old 07-28-2013, 03:50 PM Thread Starter
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After a little look Summit Racing has a setup with their name on it. Not sure as far as performance claims. Just another option for those looking to compare pricing to other brands.

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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post #5 of 10 (permalink) Old 08-25-2013, 12:04 PM Thread Starter
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Found this on the Flowmaster website under racing mufflers. They list one "laminar flow" muffler intended for use on pulling rigs among other applications. Doesn't mean you can't experiment with other designs too.

http://www.flowmastermufflers.com/?page_id=95

I also googled 'diesel exhaust flow' and brought up a link for Engine Horsepower and Exhaust Flow PDF from Donaldson. Since I have a parts catalog on their exhaust products I am just looking in their catalog for any calculations and found this from them...

(Exhaust temp. (F) + 460/540) X Intake Airflow (CFM) = Exhaust Flow

Also below that they list engine type and aspiration, engine temperature and max backpressure

Diesel 2-cycle (natural) Engine Temp = 900 Deg. F Max backpressure of 4"Hg
Diesel 2-cycle (turbocharged) Engine Temp. = 750 Deg. F Max backpressure 3"Hg
Diesel 4-cycle (natural) Engine Temp = 1000 Deg. F Max backpressure 3"Hg
Diesel 4-cycle (turbocharged) Engine Temp. = 900 Deg. F Max backpressure 3"Hg

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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Last edited by Fahlin Racing; 08-25-2013 at 12:20 PM. Reason: Added
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post #6 of 10 (permalink) Old 08-25-2013, 12:19 PM Thread Starter
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Also list Engine Airflow calculations, since we feed more fuel I am sure the temps listed will vary from the above calc.

4-cycle engine airflow
(Engine size CID x RPM / 3456) X Volumetric Effciency (VE) = Intake Airflow (CFM)
2-cycle engine airflow
(Engine size CID x RPM/1728) X Volumetric Effciency (VE) = Intake Airflow (CFM)

Volumetric Efficiency
Diesel 2&4 cycle Naturally Aspirated = .90 and turbocharged = 1.50 - 3.00*
Quote:
* If VE rating is not available, Donaldson recommends using the highest value to insure proper airflow.

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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post #7 of 10 (permalink) Old 08-25-2013, 12:28 PM Thread Starter
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Looks like Flo-pro and Gibson have something for diesel as well. Grand rock and Heavy Duty brands too for not just piping.

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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post #8 of 10 (permalink) Old 08-25-2013, 12:35 PM Thread Starter
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After looking through Magnaflow website they don't seem to make the flow numbers for their product easy to find, that is if its even posted on their website. Here is the link below to their specific diesel mufflers.

http://www.magnaflow.com/diesel/dieselMufflers.asp

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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post #9 of 10 (permalink) Old 11-16-2013, 01:21 AM Thread Starter
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For those who haven't seen this thread by SSpeedDemonSS. Brings the question how much does it take to harness acoustics and improve flow.

https://www.thedieselgarage.com/forum...34#post1162034

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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post #10 of 10 (permalink) Old 11-16-2013, 12:55 PM Thread Starter
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Here is another pic,reminds me of the Cherry Bomb mufflers

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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