So, what makes the v8 noise?
Discussion
Its something i've often wondered, why do v8's have the cool idle noise, i always thought it was down to the firing order, but about an hour ago i read, that they changed the firing order between the ls1 and the ls2.
And how do flat plane cranks like in the ajp engines or ferrari engines differ?
ta
And how do flat plane cranks like in the ajp engines or ferrari engines differ?
ta
AFAIK it's to do with induction and exhaust resonance due to unequal length inlet and exhaust tracts, as well as firing order. 4-pot inline engines tend to be 'symmetrical' in those respects and sound comparitively 'flat'.
V8 flat-plane crank engines run with different relative piston positions compared to a conventional 'V', giving different gas resonance effects and a different sound.
V8 flat-plane crank engines run with different relative piston positions compared to a conventional 'V', giving different gas resonance effects and a different sound.
Edited by speedtwelve on Tuesday 23 October 19:56
No no no.
It's the vangerlons.
They only live in V8 engines. When the engine is running, they are stimulated into their mating phase. The "V8 noise" is just the vangerlons calling to each other. As the engine is revved up, the vangerlons become more excited and horny.
Of course, vangerlons ony have a short life cycle and need to mate often.
Poor vangerlons.
It's the vangerlons.
They only live in V8 engines. When the engine is running, they are stimulated into their mating phase. The "V8 noise" is just the vangerlons calling to each other. As the engine is revved up, the vangerlons become more excited and horny.
Of course, vangerlons ony have a short life cycle and need to mate often.
Poor vangerlons.
i was kinda thinking that some of the cylinders fire on their own, and some fire, two at a time, and flat plane crank v8's have the all the cylinders going off at seperate times, hense engines like ferrari engines sounding like 4pots at twice the revs. regular v8's with a cross plane crankshafts never sound particularly high pitched, making me think they cant have many more exhaust pulses, (if you get me) than a 4 pot?
bigfatnick said:
i was kinda thinking that some of the cylinders fire on their own, and some fire, two at a time, and flat plane crank v8's have the all the cylinders going off at seperate times, hense engines like ferrari engines sounding like 4pots at twice the revs. regular v8's with a cross plane crankshafts never sound particularly high pitched, making me think they cant have many more exhaust pulses, (if you get me) than a 4 pot?
A bit of infor here http://www.autozine.org/technical_school/engine/sm... on V8's, but not sure it explains the sound. I like the 'vangerlon' theory (see above). 
Brink said:
No no no.
It's the vangerlons.
They only live in V8 engines. When the engine is running, they are stimulated into their mating phase. The "V8 noise" is just the vangerlons calling to each other. As the engine is revved up, the vangerlons become more excited and horny.
Of course, vangerlons ony have a short life cycle and need to mate often.
Poor vangerlons.
It's the vangerlons.
They only live in V8 engines. When the engine is running, they are stimulated into their mating phase. The "V8 noise" is just the vangerlons calling to each other. As the engine is revved up, the vangerlons become more excited and horny.
Of course, vangerlons ony have a short life cycle and need to mate often.
Poor vangerlons.
Brink said:
No no no.
It's the vangerlons.
They only live in V8 engines. When the engine is running, they are stimulated into their mating phase. The "V8 noise" is just the vangerlons calling to each other. As the engine is revved up, the vangerlons become more excited and horny.
Of course, vangerlons ony have a short life cycle and need to mate often.
Poor vangerlons.
It's the vangerlons.
They only live in V8 engines. When the engine is running, they are stimulated into their mating phase. The "V8 noise" is just the vangerlons calling to each other. As the engine is revved up, the vangerlons become more excited and horny.
Of course, vangerlons ony have a short life cycle and need to mate often.
Poor vangerlons.
best theory so farFlat plane crank 90deg V8s sound like 2x4-cylinders because (so far as I know) they fire 2 cylinders together:
e.g. (obviously the cylinder numbering system isn't exactly right and I can't be bothered to work it out at this hour, but you get the idea)
1+5 together
3+7 together
2+6 together
4+8 together
An AJP with non-90deg angle will fire something like:
1
5
3
7
2
6
4
8
A cross-plane 90-deg crank will fire something like:
1
5
3
7
2
6
4
8
e.g. (obviously the cylinder numbering system isn't exactly right and I can't be bothered to work it out at this hour, but you get the idea)
1+5 together
3+7 together
2+6 together
4+8 together
An AJP with non-90deg angle will fire something like:
1
5
3
7
2
6
4
8
A cross-plane 90-deg crank will fire something like:
1
5
3
7
2
6
4
8
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