Header with Jet-Hot coating lowers underhood temps

Reply Subscribe

Thread Tools

01-05-2006, 04:12 PM

#11

negcamber

Former Moderator

Join Date: Jul 2001

Location: Jacksonville, FL

Posts: 8,821

Likes: 0

Received 5 Likes on 5 Posts

Does anyone know if the coating is applied to both the outside and inside (ie, in the pipe)? Reading their ads makes it sound like it is both. If so, I wonder what kind of reduction in tube inner diameter can be expected,

Reply Like

01-05-2006, 09:23 PM

#12

thetz99

Registered User

Join Date: Aug 2004

Location: Davis, CA

Posts: 2,536

Likes: 0

Received 2 Likes on 2 Posts

Adds a negligible amount of inner diameter. I noticed it smoothed the openings to the tube transitions.

Reply Like

01-06-2006, 05:12 AM

#13

Triple-H

Registered User

Join Date: Feb 2001

Location: West Henrietta UPSTATE NY

Posts: 58,680

Likes: 0

Received 1 Like on 1 Post

Quote:

Originally Posted by CrazyPhuD,Dec 30 2005, 06:56 PM

Some of the negatives are placing the header under considerably more heat than it may have been designed for. Some people who have wrapped or coated headers have had no issues, others have had welds fail and cracks form. The question is, is the header designed to withstand the increased heat and how will long term reliability be impacted?

The very first header I put onto my CRX-SiR was wrapped, and I had 2 welds fail. It was the last time I ever thought about wraps or heat containing coatings... The Jet-Hot stuff looks great but it may indeed shorted the life of the header in real life.

Reply Like

01-06-2006, 10:08 AM

#14

NEODYMIUM

Registered User

Join Date: Oct 2005

Location: Jtown, Il

Posts: 244

Likes: 0

Received 0 Likes on 0 Posts

So it seems like it is probably bad to wrap headers, at least near the welds, but not so bad with the coating since the entire header is shielded. Also, In addition to reducing the diameter of the headers, the coating would keep exhaust temps higher thus effecting the tuning characteristics further. Has anybody done a before and after on a dyno?

Reply Like

01-06-2006, 10:29 AM

#15

mosesbotbol

Join Date: Dec 2001

Location: Boston

Posts: 5,171

Likes: 531

Received 121 Likes on 96 Posts

I read on some Alfa forums that many had premature failures because of jet coating, but maybe this is different? Maybe just jet coating the shielding will yield positive results?