Side Pipe SPL

[Richard Hudgins]

Gentlemen,

Here are some views of the original design headers and sidepipes for the JBL Chassis.

Note: Primaries are 1.75 X 35 inches Secondaries are 3 X 34 inches. These are not the same as current as the rear most tube does not go up and over the engine bay upper rail as this was difficult for changing plugs.





However the current units should still be close to the lenghts of the original design.

[Rare Iron]

Guys, I did an installation (retrofit) on a Ford 514 CID Factory Five on Saturday - a local guy's car in his garage. We did this on the car so we could get actual alignments & fitting. It took us 3 hours & the car owner did not have an air compressor. He went with the 3024-CP mufflers & will see a noticeable improvement. Wait til you see the entry into the mufflers after we chopped the collector & muffler apart - this is the kind of stuff I've been talking about. Also, the muffler cores looked to be about 2-1/4", so we stepped up to 3". After our tack-together mockup, he's going to take them to a welding shop & have all the seams finished with professional TIG welds, then have them ceramic coated. I got everything over to my web builder last night - a pretty nice series of photos. We will have a whole new page dedicated to retrofitting a Cobra with COBRAPACK Mufflers. This should all be up in a few days. (www.classicchambered.com)

Also, the reason why Kinetic had such huge gains in HP & torque, is because they had been using the stock Cobra mufflers which had under a 2" flowpath. On their high HP motors, this was REALLY choking the motors - they could not exhale. When they did this dyno testing, my 3" core mufflers were even more of a restrictive design than they are now - now they are very clean & maintain a consistent diameter. The same tests now would yield even better results. Chris Gesek (one of the owners of Kinetic) furnished me with the dyno #'s. There was no fudged data. Shows you just how important it is to run good flowing mufflers!

Thanks, -Eric

[Machiavelli]

Richard,
Excellent, thanks for posting that! While we're on the subject, what is your opinion of the 'stainless steel' versus 'ceramic coated mild steel' dissertation below?

Stainless Steel vs. Mild Steel - http://www.perfweldheaders.com/svsm.html

A very popular question concerning the use of Stainless steel over Mild steel in a Competition Header application constantly arises in the industry. Stainless Steel is a better choice when Header lifespan, updates, and quality are an important consideration. A Stainless Steel Competition Header, when properly built, will virtually last you a lifetime.

A Mild Steel Header in a Competition application will soon take its toll from the elements of high exhaust temperature and rust. Performance Welding has tried many Exhaust Coating manufacturers and have found none that will withstand the extreme temperature of a competition engine. On the inside of the primary tubes and at the throat of the Merged Collector, the thermal barrier coating simply cannot withstand the high temperature and after a very short period, the coating burns off and rust begins to generate.
This rust can be disastrous to any engine and can ruin many components.

On initial overlap, there is an inevitable reversion pulse that can send exhaust back up the intake tract. If the rust loosens in the header primary tube it can, and sometimes, will carry some of this abrasive material into your cylinder.

It is highly advisable after leaving Mild Steel Competition Headers over a period of time to take any precautions to remove the rust build up; on initial engine start up this rust can be disastrous.

Stainless Steel Headers have many benefits outweighing the initial cost increase. Due to the fact that they do not need a Thermal Barrier coating you save a few hundred dollars on the initial cost. Stainless Steel Headers can be repaired, or modified at any time in their lifespan due to the simple fact that they do not rust and do not need a Thermal coating. Mild Steel Headers are very tough to repair or modify due to Thermal Coatings and rust.

It is believed that due to Stainless Steel Thermal characteristics, the high exhaust temperature is retained inside the primary tubes and can increase the exhaust speed in the header, which in a Competition Racing Header sometimes is an important goal. Due to the simple fact that there is no rust generated, the inside of each primary tube will stay smooth and flow accordingly.


Performance Welding Racing Headers feel strongly about the use of Stainless Steel in your Competition Header application. If you have a Race vehicle that you truly wish your Competition header to last a lifetime, or if we have a proven Competition Header for your engines combination, or you simply like the benefits of Stainless Steel we highly recommend it in any Competition Header application.

- Mark Lelchook / Owner

[Machiavelli]

Man, the information highway is open tonight!

Eric, thanks for the info.
I hope you see this gapingly large hole in the current Classic Chambered business model like I do ...

"he's going to take them to a welding shop & have all the seams finished with professional TIG welds"