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shakir
Extreme Veteran
Date registered: Dec 2006
Location: London , UK
Vehicle(s): 1986 280 GEL manual, lpg.1991 300GEL AUTO
Posts: 404
| Exhaust manifold blanket
Has anyone tried to cover the exhaust manifold on a 280gel with an insulating blanket etc.?
There is an enormous heat generated from this part of the engine -naturaly - which I think should be kept to a minimum for the long term safety and reliability of the underbonnet components as well as stopping the hot air being sucked into the air filter, and affecting the cars performance. Any ideas recommendations? 
Edited by shakir 4/27/2007 6:30 PM
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J.R.
Elite Veteran
Date registered: Apr 2006
Location: Southern Maryland
Vehicle(s): 00 G500, 09 911 4S, 11 Cayenne S, 86 280GE (sold)
Posts: 828
| RE: Exhaust manifold blanket
I wrapped my exhaust manifolds and exhaust pipes up to the catalytic convertor. I used 1" DEI exhaust wrap on the manifolds and 2" on the exhaust pipe. I had one manifold out to replace it so I pulled the other and I pulled the exhaust pipes to the cat. I then wrapped and tied off, and painted the wrap using DEI's High temp paint. They recommend it to help the wrap last longer. I had mine on for two years and it still looked pretty good.
www.summitracing.com
Did it help performance or help my A/C. I had no way to measure, but I was moving more heat down range.
I know on my 463 that there were seals on the back edge of the top of the fire wall where it mates with the hood. Dutch and others had recommended removing them in the winter to help move warm air on the windshield and I suspect in the summer it provides more escape paths for the heat. I can't remember if the 460 has them. Worth a look.
Good luck.
Edited by J.R. 4/27/2007 7:44 PM
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shakir
Extreme Veteran
Date registered: Dec 2006
Location: London , UK
Vehicle(s): 1986 280 GEL manual, lpg.1991 300GEL AUTO
Posts: 404
| Re: Exhaust manifold blanket
I have been testing with domestic cavity insulation wool which is fire safe- i have covered the manifold with it and stopped most of the unwanted heat affecting the other components
So far it has been succesful |
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Kano383
Date registered: Dec 1899
Location:
Vehicle(s):
| RE: Exhaust manifold blanket
Shakir,
There is this product, also used on aircraft:
http://www.aircraftspruce.com/catalog/eppages/exhaustwrap.php
Downside of keeping heat on the manifold is that you reduce the manifold's life (increased corrosion and cracks).
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Ed Mclass
Expert
Date registered: Apr 2006
Location: Nashville, Tennessee
Vehicle(s): 1958 180a, 2010 GLK, 2000 G 500, 2005 SLK 350
Posts: 1215
| Re: Exhaust manifold blanket
The 460 series has the same rubber strip at the top of the firewall. Removing it certainly helps in getting the heat out of the engine bay. |
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Jonathan Joseph
Expert
Date registered: Oct 2006
Location: Charleston, South Carolina
Vehicle(s): 2004 G55
Posts: 1538
| RE: Exhaust manifold blanket
With all due respect to everyone and acknowledging that many great innovations come off this forum, I have to ask,
Why alter some thing as basic as the air flow and heat shielding of the exhaust? Isn't this something the MB engineers probably spent alot of time designing? I've seen several discussions here about cooler being better, and I don't always believe that. Your engine and it's cooling system are designed to operate in a wide range of conditions but be aware that when you start changing things to benefit one application you are going to affect the whole range of applications( Example, that piece of cardboard in front of the radiator may be the trick in super cold winter areas but you need to remove it in summer.)
I'm sure some of our resident technical gurus have a smarter take on this than me. I think just because it feels hot to a human hand doesn't mean all the little bits and pieces in there that were designed to be in there aren't happy!
Jonathan |
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Adoni
Expert
Date registered: Apr 2006
Location: Sacramento, CA
Vehicle(s): '00 G500, '15 C300 4Matic, '06 L322 G4
Posts: 1283
| Re: Exhaust manifold blanket
The reason is that in some applications, such as my car, underhood temperatures cause headaches such as serious heat soak on my starter that prevent me from restarting my car right away after being driven in hot conditions or for a long time in anything over 60 degrees. Can someone send me a picture of wrapping the DEI material around their exhaust manifold? I just put one around my starter. |
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shakir
Extreme Veteran
Date registered: Dec 2006
Location: London , UK
Vehicle(s): 1986 280 GEL manual, lpg.1991 300GEL AUTO
Posts: 404
| Re: Exhaust manifold blanket
Thanks Adoni, you know what I am talking about. But hasn't your starter got a heat shield, originals all have one. 280 G wagens have some design/engine compartment issues which were all addressed in the later models but it is up to us , current owners to improve our trucks.
1. Manifold radiating too much heat specially in hot climates, MB existing heat shields etc are not sufficient as a result of this
Air intake is adversely affected hence cars performance deteriorates
Internal components get overheated ie. Brake servo, Brake master cylinder,air conditioning pump, alternator, starter etc
Air intake design is bad as well,there is not enough fresh cold air that is going in simply because there is no place for it, hence the air vents in later models. Personally I am installing a MB original snorkel to my one from a 461 model ,which will be coupled to a universal K&N filter,I got rid of the MB original air box, totally useless.
By the way the domestic insulating material that I have covered the manifold with is doing a fantastic job under bonnet heat is very moderate and I have realized that the car is more responsive, I would like to get a proper manifold blanket but they retail at about £100 in UK, and before the investment I just wanted to make sure it will be beneficial and so far it has been 
Edited by shakir 4/28/2007 6:24 PM
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Adoni
Expert
Date registered: Apr 2006
Location: Sacramento, CA
Vehicle(s): '00 G500, '15 C300 4Matic, '06 L322 G4
Posts: 1283
| Re: Exhaust manifold blanket
I have a heat shield, I can only imagine how bad things would be without it. |
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hus55
Expert
Date registered: Apr 2006
Location: north cyprus,lapta.
Vehicle(s): 300GDS, G300 LONG,300GDT CLK55 AMG CAB.
Posts: 2230
| RE: Exhaust manifold blanket
sounds intersting shakir,i think the 461 air vent in the front wing is a wise idea for better cold air intake,hence its introduction on the 461 and 463 range (and also incorporated into the later model diesel w201 2.5 td's,w124 and sprinter vans)
i have been looking at the k&n website and like the apollo system that has the heat dispersing cold air intake cover fitted,made of a special material. i will end up fitting that to my 280 and also adding the air vent in the wing for direct external fresh air intake. |
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roughneck
Expert
Date registered: Apr 2006
Location: UK, Germany & USA
Vehicle(s): 270 cdi.300 GD 300 GE.lwb 300 GE.swb. Disco 2
Posts: 4398
| RE: Exhaust manifold blanket
I might be wrong but having looked at Shakirs engine once I beleave it is originaly from a car, that means a higher compression ratio than the G 280 also less air flow that creates in turn more heat, G engines were originaly fitted with component heat shields, however the heat shield for a 463 500 engine can be adapted quite easily to make an effective shield on a 460, another way to reduce the heat is to retard the ignition a couple of degrees, also bear in mind that a stainless exhaust is not as good at heat conduction as a mild steel. |
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DesertStar
Expert
Date registered: Apr 2006
Location: San Diego, CA USA
Vehicle(s): 85-280GE/95-G320/08-G500
Posts: 2156
| RE: Exhaust manifold blanket
Shakir, didnt you install extra cooling fans awhile back ? Did they help? Articles I read about heatwraps were not all that comforting for "non-race" applications as materials that make up the manifold need to breath and constant heat with encapsulation of a heat wrap keeps heat on the materials longer. It may be smarter to wrap the components you want to protect with the wrapping an not the source? I made my own heat guard and it really did the trick for reducing heat on the side of my engine compartment.
Mike |
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Jonathan Joseph
Expert
Date registered: Oct 2006
Location: Charleston, South Carolina
Vehicle(s): 2004 G55
Posts: 1538
| RE: Exhaust manifold blanket
Roughneck,
What components had heat shields? I don't think there are any left on my engine, since it was swapped for a new one, some pieces got "misplaced"
Jonathan |
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roughneck
Expert
Date registered: Apr 2006
Location: UK, Germany & USA
Vehicle(s): 270 cdi.300 GD 300 GE.lwb 300 GE.swb. Disco 2
Posts: 4398
| RE: Exhaust manifold blanket
As I recall. on a RHD vehicle, there was a heat shield over the manifold and under both the brake and clutch masters. |
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