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To Support Strap/Bracket or Not to Support Strap/Bracke... - 1/11/2013 9:52 PM   
dasintex



Posts: 2016
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From: Central Texas, TX, USA
Status: offline 		Here's what I have and know, A DLE55 with a 'JTEC WRAP AROUND PITTS' Muffler on a TF Giant P-40; the Muffler features Long Exhaust Tubes, my thought was, the Vibration and shaking of the Engine will shake the Muffler to a point the Muffler will crack and fall apart, despite how solid the engine feels mounted on the Standoffs, the Engine still Vibrates, Flexes and Shakes, no more than normal and what would be expected, Firewall Flexing, etc,.

A few Guys have stated their Wrap Around Pitts Mufflers have failed this way and they were using Jtec, in assuming that my Muffler does not come loose which some have stated has happened and probably contributed to the Muffler Cracks and Failure, I will be using Wire Lockable Bolts. Is using a Support Strap, mounted to the Muffler End Plate and secured between the Engine Mounting Bolts and Standoff; Overkill, Not Recommended, etc?

JTEC does not recommend Support Straps and states that using one Voids the Warranty, besides voiding the Warranty what will it Hurt?

Thanks.

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RE: To Support Strap/Bracket or Not to Support Strap/Br... - 1/12/2013 1:51 AM   
jetmech05


 

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From: Jacksonville, FL, USA
Status: offline 		safety wire the screws will end the coming loose problem....if the manufactuer say a bracker voids the warrenty...don't use one

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RE: To Support Strap/Bracket or Not to Support Strap/Br... - 1/12/2013 3:25 AM   
speedracerntrixie


 

Posts: 2384
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From: San Jose, CA, USA
Status: offline 		Get a Slimline pitts muffler instead of the Jtech and use a strap if you have to use a pitts type muffler. I have used Jtech mufflers once in the 15 years I have been running gassers, I hope you pick up on the hint.


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RE: To Support Strap/Bracket or Not to Support Strap/Br... - 1/12/2013 2:06 PM   
Lnewqban



Posts: 3908
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From: South Florida, USA
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quote:

ORIGINAL: dasintex

Here's what I have and know, A DLE55 with a 'JTEC WRAP AROUND PITTS' Muffler on a TF Giant P-40; the Muffler features Long Exhaust Tubes, my thought was, the Vibration and shaking of the Engine will shake the Muffler to a point the Muffler will crack and fall apart, despite how solid the engine feels mounted on the Standoffs, the Engine still Vibrates, Flexes and Shakes, no more than normal and what would be expected, Firewall Flexing, etc,.
......

JTEC does not recommend Support Straps and states that using one Voids the Warranty, besides voiding the Warranty what will it Hurt?


Aluminum will crack eventually, specially at the welds.

I would support the end of the manifold and the exhaust pipes with blocks of neoprene against the firewall.
The manufacturer forbids the use of straps, because they will produce vibration related perforations and metal to metal corrosion.

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Lnewqban - "The recipe for perpetual ignorance is: be satisfied with your opinions and content with your knowledge." - E. H.

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RE: To Support Strap/Bracket or Not to Support Strap/Br... - 1/12/2013 6:02 PM   
speedracerntrixie


 

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From: San Jose, CA, USA
Status: offline 		I find it curious that Jtech advises against a strap and Slimline comes with one. Everytime I have seen someone use a pitts type muffler without a strap they have had issues with bolts coming loose. Too bad a stock muffler wouldn't work as it is the best for reliability.


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