Fitting Aftermarket Exhaust Manifold/Headers

SeanDezart

Well-Known Forum User
France = Franky - where you at den ?

France, Germany and Mr Juncker have just wooed President Xi Jinping....we're not leaving anything.
 

Albrecht

Well-Known Forum User
France, Germany and Mr Juncker have just wooed President Xi Jinping....we're not leaving anything.

Are they sorting out the tariffs for your exhausts?

I'd take the likes of Verhofstadt, Drunker, Tusk and Barnier a little more seriously if they put some climate change pressure on the PRC. Whilst they are creating laws which end up with us not being able to drive our cars, the PRC are building a new coal-fired power station every week.
 

AliK

Vehicle Dating Officer
Staff member
Club Member
More than adequate if you stick it up both ends........

I will be sure to stick it up both ends of Sean's! :p

It's a damn sight cheaper than the £400 it cost to ceramic coat my full exhaust system last time and at £50ish it's worth a shot before fitting - unless of course Sean say "non, pas la peine"? Or PMAC says "Yer aff yer heid, stop messin aboot"!
 
Fwiw, I used to have a shield from head to chassis but it really got in the way.
I swapped to the per-carb heatshields you can get for Webers and Dellortos a year ago and didn't have any heat related problems last year.

I can't remember seeing a car where the exhaust manifold was 'boxed' in, thats what my comment was about, along with a couple of the pics providing a hard link.

It'd be interesting to see your per-carb setup also. Effectively the same as the tray you get with some aftermarket carb setups?
 

johnymd

Club Member
IMO if you mount the heat shield to the engine and then to the chassis you will get differential movement and continuous flex in the heat shield. It will generally flex at its weakest point all the time. Eventually the ali will break at that point. It's easy to test this out. Just get a thin piece of ali and bend it back and forward a few time. You will start to see a fracture line and then it will fail on the line in a very short time.

I have used that same material for my heat shield and it is very easy to form around the manifold and then us the stainless steel tie wraps as suggested to just keep it in place.
 

jonbills

Membership Secretary
Site Administrator
I can't remember seeing a car where the exhaust manifold was 'boxed' in, thats what my comment was about, along with a couple of the pics providing a hard link.

It'd be interesting to see your per-carb setup also. Effectively the same as the tray you get with some aftermarket carb setups?
These are they Jason. I added a layer of heatproof cloth too.

https://www.dellorto.co.uk/shop/del...12-dellorto-dhla-stainless-steel-heat-sheild/

They don't look much, but without them or the full shield I had fuel boiling in the carbs. No probs at all now.
 

Woody928

Events Officer
Staff member
Club Member
IMO if you mount the heat shield to the engine and then to the chassis you will get differential movement and continuous flex in the heat shield. It will generally flex at its weakest point all the time. Eventually the ali will break at that point. It's easy to test this out. Just get a thin piece of ali and bend it back and forward a few time. You will start to see a fracture line and then it will fail on the line in a very short time.

I have used that same material for my heat shield and it is very easy to form around the manifold and then us the stainless steel tie wraps as suggested to just keep it in place.

Hmmm this was a concern of mine, thinking I prefer my orginal idea of the stainless steel cable ties again now. Pressume you never had any noise/rattles from this method?

Equally if the Ali is as Rigid as I'd expect then making a bigger version of the stock heat shield with this matieral could work just as well and doesn't need to be supported at the bottom.....
 
Hmmm this was a concern of mine, thinking I prefer my orginal idea of the stainless steel cable ties again now. Pressume you never had any noise/rattles from this method?

Equally if the Ali is as Rigid as I'd expect then making a bigger version of the stock heat shield with this matieral could work just as well and doesn't need to be supported at the bottom.....

I can show you pics of the oer one, its nothing flash, just a complete cover for under the 3 carbs.

What we all need are mild steel systems, they make more power and don't radiate heat as much :)
 

Woody928

Events Officer
Staff member
Club Member
I can show you pics of the oer one, its nothing flash, just a complete cover for under the 3 carbs.

What we all need are mild steel systems, they make more power and don't radiate heat as much :)

Thanks Jason, please fire away! :thumbs:
 
Thanks...for pointing out that I've wasted 10yrs of my life.:(

You haven’t, you could offer mild steel, no one would buy them as for 99.9999% of the world, the extra 0.5bhp or a more flexible setup/lighter setup isn’t worth it over the corrosion resistance of a stainless system.
 

SeanDezart

Well-Known Forum User
Ok, thanks.

Except that Steve Kiddell, for whom the extra % of hp was worth chasing was running one....and Dave Rebello, who also boasts max power reccomends them to customers and has just bought 5x !
 
Ok, thanks.

Except that Steve Kiddell, for whom the extra % of hp was worth chasing was running one....and Dave Rebello, who also boasts max power reccomends them to customers and has just bought 5x !


No I mean like factory race teams! The power accept might be more to do with two stroke engines.
 
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