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Anders Dinsen
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« Reply #142 on: August 30, 2012, 09:44:23 pm » |
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Your photos are good, and there obviously very little space there. I'd be more worried about the exhaust banging the heat shield. Unless you're going to store food in the trunk, really don't see the problem. Further, while the car should of course be able to withstand idling for as long time as you wish, it is not a normal mode of operation, and as soon as you get moving, the air will start flowing over the engine and out of the ventilation holes under the trunk. This will cool off the engine as well as the trun very effectively.
I think you will regret converting back to the standard exhaust, and I don't think it will change much temperature wise. But since, I only have experience with a 4-in-1 manifold like yours, I can't say for sure. Can someone else comment on this?
We're having our annual Matra meeting here in Denmark this weekend, so I'll see if I can get a few photos of similar installations and ask others about their experiences.
/Anders
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1982 Talbot Matra Murena 2.2 prep 142 2017 BMW i3 "Charged Professional" 94Ah
Used to own: 2001 Renault Matra Grand Espace "The Race" V6 24v 1997 Renault Matra Espace 2.0 8V 1987 Renault Matra Espace J11 2.2
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Anders Dinsen
Administrator
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Posts: 3188
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« Reply #146 on: September 03, 2012, 06:29:48 pm » |
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I managed to take a photo of my exhaust seen from below. As you can see my car also has just a small gap between the pipes and the chassis. I have never had any problems though. During acceleration, the engine will twist to counter the rear wheel torque, and this will increase the gap slightly. So I wouldn't worry about your clearance.
The temperature in the boot seems a little high, though. I've been thinking about that. How did you measure it? Was the car idling or driving?
After 50 km driving on motorway (i.e. plenty of airflow), my boot is warm, but certainly not more than 35 degrees. Have you checked your ignition timing? The exhaust gasses will be hotter with retarded ignition. This is because with advanced ignition there's more energy transmitted into the conrods and this, according to the principles of thermodynamics, cools off the gasses in the cylinder. So, if you're running with the ignition at 5 degrees or less, that could be your problem. Mine is advanced almost to 15 degrees (set up professionally on a rolling road and always only fuelled with RON 97 or higher).
/Anders
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Logged
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1982 Talbot Matra Murena 2.2 prep 142 2017 BMW i3 "Charged Professional" 94Ah
Used to own: 2001 Renault Matra Grand Espace "The Race" V6 24v 1997 Renault Matra Espace 2.0 8V 1987 Renault Matra Espace J11 2.2
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