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Tim_E

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Tim_E last won the day on January 2

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About Tim_E

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    Rank: Renault 16

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    A windy rock in the North East Atlantic.
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    Music, gardening, bringing up a 6 year old nutter and an infant.

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    Wales

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  1. My passat 1.9 pd diesel does a similar thing, for a similar reason. I think these burbling noises are rev- specific, as you suggest. My former M54 straight 6 engine that @Sunny Jimnow owns is interesting; it is creamy smooth at idle and lower revs but gains a noticeable burble as you get to high revs, presumably due to the interaction of the timing / distance of the pulses with the 3to1 headers per bank. I think there's something similar going on with your V12 but opposite way around?
  2. To be fair, whether or not I can get a suitable audio sample it's really fascinating in its own right. I'll definitely be pouring over it and trying to understand what's going on! Thanks, lots of details. Much appreciated 👍
  3. I'll have a go but I think i need audio only recordings at the specific rpms of 1000, 2000 and 4000 to be useful, and pointed towards to exhaust tip... I'll see if I can get anything useful anyway. Thanks!
  4. Yes. You can't scavenge exhaust gasses with uneven headers or in the v8 with a crossplane crank, though as soon as you add forced induction you don't need the exhaust scavenging to draw the exhaust out of the cylinder as the inlet is under increased pressure so you can get big power gains by charging.
  5. OK, any recordings you may want to make please do. I would recommend placing your phone underneath the exhaust or out of the way of the turbulence, revving your engine to 1000 rpm and holding, then 2000 rpm and holding then, if possible, 4000rpm and holding. Hold only so revs stay at the desired revs for a few seconds. Then send me clips, I'll cut and compare then l'll try to learn this spectrum analysis and waterfall stuff, but if anyone wants to contribute expertise (any knowledge is more than mine) or time I'll share all data.
  6. This channel is awesome! Much time was lost spent doing research last night. He uses a slightly different pitch of click for different cylinder banks and successfully re-creates a lot of the engine sounds. Maybe the length and position of header tunes the note on a car...? More is to be learned.
  7. I'd love that thanks. Out of interest, I thought diesels always had direct injection even it was mechanical for most of history, as the injection is the event that times and initiated combustion? Anyway, I'd love samples. Thanks 😊
  8. As far as I know so far the headers play a big role in separating the two banks and essentially preventing an even hum from occurring, instead the pulses get a bit squashed together to create a rough splutter, even if the actual engine firing evenly.
  9. If you wanted to chip in and help that would be good, I'm not very good with the tech! Yes I'm using Audacity because it's all a folk muso and a live jazz bassist needs... 😅
  10. It won't as it ought to be on 240° firing! It ought to sound sweet and growly.
  11. Phone is sophistimacated enough for now. Position it beneath the tip of the exhaust on something but not in the draught, get in and rev and hold at 1000, then 2000, then maybe 4000 then I can really get nerdy.
  12. No because you turned up in a steam cloud, unless you are suggesting some quantum eraser kind of effect with your coolant pipe and my phone. Allow me to suggest that's unlikely...😋 But yes on the rev up to 1000 rpm or so it came out clean. N/a Crossplane V8s are always going to suffer from uneven fuelling etc due to uneven exhaust scavenging. I'd like to get more samples with more understanding of what I'm doing 😁
  13. It sounds clean, it may well be useful. Tomorrow... For now though, I have a clean sample from @mat_the_cat and mine with times and good peaks... They both work out at about 36 peaks per second. Interesting.
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