PS-Technik reader question Mount heat protection on the manifold

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PS-Technik reader question Mount heat protection on the manifold
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PS-Technik reader question Mount heat protection on the manifold

Technology: Mount the heat protection on the manifold
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PS reader Holger Wisotzki wants to wrap the manifolds of his Ducati Monster with exhaust wrap, but fears that the engine will then overheat.

Werner Koch

04/12/2016

Hello dear PS team, I’ve been driving one for almost two years Ducati Monster 796 ABS and covered 14,000 happy and warm kilometers (all in Thailand) with her. And there lies my problem: The heat radiation from the engine and the exhaust manifold is so enormous that I get blisters on my calves despite protective clothing. I’ve heard similar stories of suffering from other monster drivers. Hence my plan / idea to wrap the exhaust pipes with bandages from Louis motorcycle accessories, for example. But I have concerns that the engine will overheat and possibly be damaged in the long term. Have you had any experiences or tests in this regard? Or can you recommend something to me? I would be very happy to receive an answer, for the benefit of my calf and that of my wife (who is even more beautiful …), says Holger Wisotzki.

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Hello Holger, we have already used the exhaust wrap, as it is called in the hobbyist jargon, and can say that it does not harm either the performance or the engine. The higher exhaust gas temperature results from the fact that the manifolds can give off less heat through the insulation. However, this only happens after it exits the combustion chamber or after it has flowed through the exhaust valve. Therefore the heat of the exhaust gas stream does not matter. In addition, the flow resistance of hot gases is lower, which is why some hobbyists and cafe racer tuners also believe that this increases performance. But that is secondary, otherwise the manifold systems of the Formula 1 and MotoGP racers would also be wrapped. There the exhaust gas flow is optimized with calculated cross-sections and pipe lengths


PS-Technik reader question Mount heat protection on the manifold


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PS technology expert and motorcycle whisperer Werner “Mini” Koch is constantly tinkering and tinkering himself in his own workshop, and no technology topic is too confused for him. And if he doesn’t really know what to do, he knows exactly where to ask.

The problem of annoying heat radiation is not new. In the past, the raised exhaust manifolds of some scramblers burned thighs en masse. The solution back then: double-walled manifold systems. These are exhaust constructions in which two pipes are inserted into one another and then bent. The small air gap in between ensures that only little heat reaches the outside. This trick also prevented the chrome-plated manifolds from turning blue and yellow, which was considered a defect in the 1960s and 1970s.

Today the elbows are made from a VA steel tube that is only 0.8 to 1.0 millimeters thick, which naturally changes color under the heat and gives off an enormous amount of heat. Large, powerful two-cylinder engines in particular have to struggle with this problem. Which is why, for example, KTM packs the manifold on the RC8 R and the Adventure 1190/1290 in aluminum insulation material, and that without heat damage to the engine. A little tip when wrapping: fix the ends of the tape with safety wire, which is clean several times and at the same distance wrapped around the elbow and twirled at the end. This works quite well even without pincers. Or you can use cable ties made of VA steel, which are also used by Polo, Louis & Co. to buy there. However, they are not cheap. When winding the tape itself, always turn it vigorously in the winding direction on the bend so that it is full and secure. Have fun with the Duc – without burn blisters, of course!

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