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14th January 2020, 14:02 | #1 |
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R 75 Tourer diesel Conny 2002, V6 Conny saloon petrol 2003 Join Date: Mar 2013
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How big a drain hole in new silencer?
There is frequent mention that it may be helpful to "drill a small hole" in any new silencer presumably at the lowest point. So two obvious questions: if it's so beneficial why don't the exhaust makers supply it ready drilled? (OK if it does prolong the life, then they'd last longer but reduce sales . . .).
And how big? 5mm? Too big and presumably it would blow. Comments awaited.
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Rover 75 Tourer Conny 2002 remapped 160 auto, R75 V6 2.5L auto Connoisseur 2003 |
14th January 2020, 15:58 | #2 |
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Rover 75, and Mg zt 1.8T Join Date: Aug 2019
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I would drill a 3mm hole anywhere on the lowest point, then put in a self tapper screw, so it can drain when you want, and not blow.
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14th January 2020, 16:25 | #3 |
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Rover 75 Saloon Join Date: Apr 2019
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I found water collected in the pipe bend leading to rear silencer. It wasn't in the silencer itself.
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14th January 2020, 18:15 | #4 |
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Roverless + 1.7D Sportage Join Date: Aug 2014
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I had a 3mm hole in my old car and you couldn't detect any extra noise but the condensed water would definitely drain away. After drilling the hole, I applied a decent amount of silver hammerite so that it wouldn't rust (inside or out). I popped a self tapper in at MOT time.
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14th January 2020, 18:42 | #5 |
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3 mm is fine and will do what you want it to but you don't need the hole in the diesel exhaust.
They don't rust away like the petrol exhausts do. They have a coating from the diesel oil.---- |
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