|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
10-03-2023, 06:30 AM | #1 |
Senior Member
Join Date: Sep 2022
Location: San Antonio Texas
Posts: 248
|
Header wrap or Jet Hot or ceramic coating
Have you wrapped or coated your exhaust manifold / header? What was the result? The product manufacturers boast of lower under hood temperatures and increased power.
__________________
David in San Antonio 1930 ('31?) Deluxe "Wretched Roadster" Restored 1957 Alamo A’s Club |
10-03-2023, 07:17 AM | #2 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 4,052
|
Re: Header wrap or Jet Hot or ceramic coating
The wrap keeps the exhaust gas hot and for some reason this helps the engine performance. I think it helps with the scavenging somehow. Perhaps preventing a standing wave in the exhaust that reflects the pressure wave back up to the exhaust valve. Or it could be the hotter exhaust gas is less dense and flows easier. I don't know. The secondary effect is keeping the engine compartment cooler but I don't think that is the primary objective.
__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
Sponsored Links (Register now to hide all advertisements) |
|
10-03-2023, 08:58 AM | #3 |
Senior Member
Join Date: Jan 2016
Posts: 2,126
|
Re: Header wrap or Jet Hot or ceramic coating
I have wrapped headers and pipes before and never noticed an increase in performance. Definity helps with heat.
For a standard Model A I don't see the cost and effort paying off. Maybe as NK mentions about gas flow, in high HP engines it could help with the exhaust gases. |
10-03-2023, 09:21 AM | #4 |
Member
Join Date: Apr 2023
Posts: 32
|
Re: Header wrap or Jet Hot or ceramic coating
You want the manifold to cool. Wrapping it might lower temperatures under the hood, but might cause unexpected heat issues. They warp now!
|
10-03-2023, 09:30 AM | #5 |
Senior Member
Join Date: Feb 2019
Location: Atlanta, GA
Posts: 315
|
Re: Header wrap or Jet Hot or ceramic coating
The exhaust wrap can trap moisture. If you do wrap it make sure you do not park it with the wrap wet.
I learned that lesson the hard way on an old Jeep I had |
10-03-2023, 10:30 AM | #6 |
Senior Member
Join Date: Jun 2014
Location: Land of Lincoln
Posts: 3,161
|
Re: Header wrap or Jet Hot or ceramic coating
Sponsored Links (Register now to hide all advertisements)
__________________
Don't force it with a little hammer tap, tap, tap get a bigger hammer tap done |
10-03-2023, 11:47 AM | #7 | |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,547
|
Re: Header wrap or Jet Hot or ceramic coating
Quote:
Lowering underhood temps can most greatly be improved by using engine pans which will force most of the frontal air going thru the radiator to exit out the hood louvers and some out beside the transmission. |
|
10-03-2023, 06:02 PM | #8 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 4,052
|
Re: Header wrap or Jet Hot or ceramic coating
Mike in Milwaukee, You are correct that you don't want to run the cast iron manifolds hotter. I don't think anyone will wrap the cast iron manifold, but I could be wrong. I think the discussion is about wrapping the tube type headers. They don't have the warping problem that the cast iron manifolds do.
I don't think anyone will notice any performance improvement by wrapping the headers. That is unless you are building a racing engine.
__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
10-04-2023, 10:06 PM | #9 |
Senior Member
Join Date: Jan 2021
Location: Waynesboro Va.
Posts: 246
|
Re: Header wrap or Jet Hot or ceramic coating
I have 2 A's, 1 with an original manifold and 1 with a ceramic coated one. If I idle them for the same amount of time the ceramic one is definitely slower to heat up. Once they are both at running Temps I'm not sure if there's a huge difference.
|
10-05-2023, 03:18 PM | #10 |
Member
Join Date: Oct 2021
Location: Cary, North Carolina
Posts: 80
|
Re: Header wrap or Jet Hot or ceramic coating
As a follow-on to Brent's comment I'll add that I just added engine pans to my late '31 68C earlier this week after driving without them for more than a year. I realized an INSTANT drop in heat coming into the cabin...it was like night and day....far more evident than the under carpet insulation I added last spring. Had I realized how effective the engine pans are at reducing cabin heat I would have installed them long ago.
__________________
Cliff Ward Cary, North Carolina |
10-05-2023, 03:37 PM | #11 |
Senior Member
Join Date: Sep 2022
Location: San Antonio Texas
Posts: 248
|
Re: Header wrap or Jet Hot or ceramic coating
Thank you all for relating your experiences.
As the Wretched Roadster 1. has her engine pans in place, and 2. I don't want to increase the probability of warping the exhaust manifold by wrapping it, and 3. ceramic coating's benefit is only apparent when first heating up, therefore 4. I will do nothing. This will not increase the weight of the vehicle, nor cost money, nor take time. Whew. Now I can focus on the many other things calling out to me.
__________________
David in San Antonio 1930 ('31?) Deluxe "Wretched Roadster" Restored 1957 Alamo A’s Club |
10-06-2023, 12:33 AM | #12 |
Senior Member
Join Date: Nov 2011
Location: Sonoma, CA.
Posts: 1,507
|
Re: Header wrap or Jet Hot or ceramic coating
Wraping usually causes problems over time, warping, cracking.
Ceramic coatings definitely keeps things cooler under the hood plus the added protection against rust. And it looks great. |
|
|
Sponsored Links (Register now to hide all advertisements) |
|