[Healeys] Jet-coating, wrap or do nothing to stainless headers?

[Bob Spidell]

I'll add that, although I wrapped the mild steel downpipes on my BJ8 and have no problems--that I know of--I've become reluctant to recommend it. I've seen photographic evidence of pipes being severely eroded by wrapping; though it appears to be a hit-or-miss issue, and may be due, in part, to how they were wrapped and what they were wrapped with (I have to believe if it was a very common problem nobody would buy the wrap and companies would cease to sell it). I wouldn't expect ceramic coating to be a problem, at least if the pipes were coated both inside and outside (inside only might even be better). 

Here in the colonies we mostly have to use gas with 10% ethanol ('pure' gas is available at some stations, but it's relatively rare). On a warm day, if my engine is hot and shut down for less than a couple hours and restarted I'll get some stumbling until air flow has cooled everything off a bit. I can't say with absolute certainty that the gasahol is the problem, but I don't recall this ever happening before the new formulation became prevalent. I think ceramic coating the manifold might cure this problem. 

Bob 

----- Original Message -----

From: "Oudesluys" <coudesluijs at chello.nl> 
To: "healeys" <healeys at autox.team.net> 
Sent: Sunday, November 15, 2015 2:28:55 AM 
Subject: Re: [Healeys] Jet-coating, wrap or do nothing to stainless headers? 

Mirror polish them and leave them alone. Wrapping may lead to burning the metal away, coating possibly a similar story. By polishing you reduce the radiation of heat so the carbs should remain relatively cool. Anyway Webers/DellOrto's do not have the tendency to boil fuel. Also a car with an electric fuel pump does not normally have problems with fuel vapour lock. 
Kees Oudesluijs 




Op 15-11-2015 om 11:11 schreef Simon Lachlan: 





I have stainless headers going down into a big bore(?) exhaust. 

Opinions seem to vary as to the merits of wrapping, coating or doing nothing to them . 

I have Webers above them, but I suspect, in my ignorance, that these are maybe less prone to evaporation issues than SUs. 

What does the panel think? 

See attached for a well researched synopsis. (Not by me!) 

Simon 

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