Scooby sound
31 January 2003, 10:00 AM
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Just wondered if there was a reason why the Scoob engine/exhaust sounds so distinctive (and good).
I can't see why the boxer layout should do it. Do the two banks go all the way to the back of the exhaust, seperately?
I can't see why the boxer layout should do it. Do the two banks go all the way to the back of the exhaust, seperately?
31 January 2003, 12:26 PM
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Those that answered 'flat 4' - what is the technical reason why this would sound different from an in-line 4?
I have to say that I haven't looked at the exhaust primaries. If they are different lengths, surely this is sub-optimal from the pov of performance(?)
I have to say that I haven't looked at the exhaust primaries. If they are different lengths, surely this is sub-optimal from the pov of performance(?)
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31 January 2003, 01:10 PM
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I thought the noise was due to the petrol/air exploding in the cylinders...........dont tell me after all these years of believing this,that I am wrong 
31 January 2003, 01:18 PM
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Yep, the primaries are different lengths which is sub-optimal. In a flat four the downpipe has to come down one side or the other, which means two cylinders are further from the downpipe than the other two.
BTW yoza, the fuel/air mixture doesn't "explode", it "burns rapidly". Explosion implies that the flame front is supersonic.
BTW yoza, the fuel/air mixture doesn't "explode", it "burns rapidly". Explosion implies that the flame front is supersonic.
31 January 2003, 01:46 PM
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Yes,the burble is a performance hit. The new MY03 scoobs have equal length manifold whatnots, I believe, to maximise the performance, at the loss of the burble.
Or so I read. Could be wrong.
Or so I read. Could be wrong.
31 January 2003, 03:28 PM
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The new ones still burble, or at least the STI does. It's a more grown up refined burble though.
I think I might have read that turbos work best on pulsed air, hence that might be why the unequal length manifold was on originally.
I think I might have read that turbos work best on pulsed air, hence that might be why the unequal length manifold was on originally.
31 January 2003, 08:41 PM
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Recent evo magazine article mentioned new IHI twin scroll turbos that spool up quicker at the expense of the burble on new scoobs. I believe the new Jap ones can have them as an option but UK ones havent got them yet. My memory might not be great though, ahem.
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