Exhaust Wrap

[Prefect]

Happy New Year

I have been reading previous posts regarding Exhaust Manifold Wrap use and there appears to be a lot of mystery.

 

I found this : https://www.centuryperformance.com/exhaust-header-heat-wraps-do-not-use.html

 

Although is American and refers to V8's it seems to comprehensively cover the topic also explains Extractor Exhaust Manifolds!

 

I have had a Phoenix SS 6 3 1 for 7 years on my 6CR and have had no issues, however I have just noticed the wiring on the starter motor has been getting hot so I propose to wrap the starter motor cw wiring with exhaust wrap.

 

 

 

[BlueTR3A-5EKT]

If you could get one a TR7 starter heat shield may do the job. It clips to the solenoid.

https://rimmerbros.com/Item--i-GRID006211

[Fireman049]

I covered the hi-torque starter motor on my 3A with heat reflective covering.

 

Tom.

[Prefect]

If you could get one a TR7 starter heat shield may do the job. It clips to the solenoid.

https://rimmerbros.com/Item--i-GRID006211

Hi thanks.

It seems to be out of stock and when googled I got this:

https://www.demon-tweeks.co.uk/motorsport/heat-shielding-protection/cool-it-starter-heat-shield

It seems pricey so as I had purchased exhaust wrap I will trip that on the starter and solenoid.

I will post a photo if its a success....

[Dave Larnder]

Hi Prefect.

I have had Moss exhaust wrap on my TR3A since reconstruction 30000 miles ago and have continued it past the Hi Torque starter motor and do not get the problem you have. I also do not suffer from heat to the alternator as others have experienced and I live in a hotter climate than you, so wrap it tightly to get three thicknesses on the exhaust pipe surface e.g. don't skimp on it buy at least two rolls.

 

Dave

[Fireman049]

I did exactly as Dave did and double wrapped the front exhaust branch and also the two pipes near the starter motor.

I also sprayed the inside of the manifold with special heat resistant paint from Frost's.

 

Tom.

Edited January 6, 2018 by Fireman049

[Prefect]

I started the post with the link to the american site https://www.centuryp...do-not-use.html

His report is damming the practice of exhaust wrapping and he also says there is no performance gain, just problems.

From the above it seems they have no experience of burnt out exhaust manifolds.

Now I am unsure what to do........

I have the wrap should I put on or.......

[monty]

It was on my 4A when purchased over 10 years ago & has given no problems in that time. Many competition cars use it so would assume it is of use.

Regards.

[john.r.davies]

Thank you, Prefect, for finding that web page. It shows exactly the 'flaking' that I found under the wrapping on my manifold, making me fear for its erosion, as clearly happened there.

See: http://www.tr-register.co.uk/forums/index.php?/topic/64128-manifolds-wrap-or-ceramic-anyone-interested-in-a-comparison/&do=findComment&comment=555837

 

John

[oldtuckunder]

I think the rule is if you have a mild steel exhaust headers and wrap it, it will promote corrosion deterioration, which can be fairly quick. If you have Stainless Steel exhaust headers they are fine wrapped.

 

Wrap does work though!

 

From my experience the further you get away from the header pipes the less the corrosion problem is with mild steel, so primary pipes and first collectors suffer badly, next 12" of pipe suffer a bit, after that virtually no signs of corrosion. So by the time you get to the sections under the starter motor just wrapping those even if mild steel shouldn't be a problem. Of course at that point its easier to just wrap the starter motor!

 

Alan

[john.r.davies]

If you're concerned about the starter , a heat shield wil work better to protect that, or wiring or anything else, than wrapping.

The heat still radiates, but hits the shield that has a much bigger surface area and radits it away mcuh faster, so it's cooler, with less heat hitting the starter.

John