V8 Noise variants
Discussion
Codswallop said:
Cylinder firing order and crank design have a very large part to play as well. Sounds like you prefer the sound of flat plane crank cars (typically Fezzas, AJP V8 TVR etc). Much prefer the traditional off beat V8 rumble myself.
Yeah, flat plane or cross plane. The latter is usually the more thumpy, off beat variety. The former the high pitched screamers. They are much closer to basically having two 4 pots going at it which is why I tend not to really like the sound of flat plane V8 like you might get in a Ferrari. I think if it werent for the exhausts, it would just be a horrible piercing noise, much like the V8's in F1. They were loud to the point of pain and not even remotely tuneful unlike the operatic V12's and creamy V10's.NASCAR V8's and the like are equally just noise, but there is something deeper there. There is a sense of untamed power. When they go past you don't just hear them, you feel them in your chest. They can literally remove your breath for a moment!
http://www.autozine.org/technical_school/engine/sm...
That is a good site for explaining how different engines are arranged. Page 4 is the V8s
Cross planes tend to be lazier sounding/revving because of the befier counter weights needed. They also have end-to-end vibration where flat planes tend to suffer, like I4's, second order vibrations caused by non-sinusoidal piston motion.Edited by Otispunkmeyer on Friday 1st January 21:41
289 small block in FiA spec in the Cobra or even a GT350 sounded wonderful, that cross between traditional Yank V8 but with 4 x IDA Webers for induction giving it a 'harder' edge.
https://www.youtube.com/watch?v=I85lay7s1NU
However, the sound of proper 426 Hemi or any other old school big V8 is just music to my ears.
These revvy modern high flat plane crank V8's leave me quite cold most of the time.
https://www.youtube.com/watch?v=I85lay7s1NU
However, the sound of proper 426 Hemi or any other old school big V8 is just music to my ears.
These revvy modern high flat plane crank V8's leave me quite cold most of the time.
PanzerCommander said:
The drag strip is the place to go for a good sounding V8.
FIA finals, nothing like a pair of blown 10,000hp top fuel cars side by side.
Indeed, though you don't so much hear these things as feel them crush the wind out of your chest and distort your vision as they blast past! Makes F1 appear more like the buzz of an annoying house fly that can't aim for the wide open window!FIA finals, nothing like a pair of blown 10,000hp top fuel cars side by side.
A flat plane crank V8 does indeed sound like a 4 cyl bike at 1500 rpm, or a Fiat X1-9, because as Kiwi explained they are essentially 2 x 4 cyl engines joined at the hip. With a conventional manifold a flat plane crank gives more top end poser at the expense of low end torque, a cross plane the reverse, because of the power pulses and the way this affects the exhaust back pressure and the engine's ability to breathe. Of course if you can be bothered to build the explosion in the spaghetti factory that is the racing V8 manifold then all things are possible.
lostkiwi said:
kapiteinlangzaam said:
vournikas said:
I do think that some cross-plane V8's can "howl"; have a listen to this GT40 at full chat :
https://www.youtube.com/watch?v=KEGUwvBG3rQ
That is one of the best V8 tunes: a low-rev burble and a high-end howl. Bloody lovely.
Without watching the video, likely fitted with an X-pipe. https://www.youtube.com/watch?v=KEGUwvBG3rQ
That is one of the best V8 tunes: a low-rev burble and a high-end howl. Bloody lovely.
Makes a traditional cross plane crank scream at high revs by balancing the exhaust flows.
The classic V8 noise is the sort of thundering bellow you get from a race tuned smallblock Chevy found in Lola T70s and most F5000 cars . Standing at start line at Donington a couple of years ago as six T70s thundered away was heaven . Few roadgoing V8s are memorable aurally- AMG and Audi RS stuff(and Aston Martin and Jaguar) is certainly loud but it's all a bit contrived and 'look at me ' exhibitionist , if not as daft as the godawful noise Ferrari V8s have been making for so many years. They sound like wannabe 2006 F1 cars with a chainsaw buzz and no character at all . For proper V8 noise I prefer the sound of a DFV (in the flat plane category ) and just about anything with a bloody great Yank V8 at a dragstrip - they make the Ferrari's weedy buzz sound anaemic .
Flat plane vs cross plane. The engine in Maserati GT is derived from that in Ferrari F430. Compare sounds on this. http://youtu.be/1qmVeQQZTMA
As has been said, the off-beat rumble of a yank V8 comes from the cross plain crank and the un-even (RLLRLRRL) firing order.
In a similar way to how an Subaru Impreza can loose it's typical boxer sound when an equal length exhaust manifold is fitted. The exhaust pulses on a V8 can be reorganised with manifold design to swap over the "wrong" cylinders. Somthing like this:
The offbeat flip-flop between the banks is also why V8s that join into a single exhaust and tailpipe don't sound quite the same as those with a full twin system because you loose the seperation of the pulses. X-pipes and H-pipes have a similar effect as they allow opposite pulses to mix.
In a similar way to how an Subaru Impreza can loose it's typical boxer sound when an equal length exhaust manifold is fitted. The exhaust pulses on a V8 can be reorganised with manifold design to swap over the "wrong" cylinders. Somthing like this:
The offbeat flip-flop between the banks is also why V8s that join into a single exhaust and tailpipe don't sound quite the same as those with a full twin system because you loose the seperation of the pulses. X-pipes and H-pipes have a similar effect as they allow opposite pulses to mix.
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