Why would a Enzo XX sound so different... - Ferrari Life
 
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post #1 of 9 Old 05-11-2013, 06:31 AM Thread Starter
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Why would a Enzo XX sound so different...

than a Enzo Ferrari? what is it exactly that makes such a big difference?

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post #2 of 9 Old 05-11-2013, 08:28 AM
 
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Pablo,

I would image it has a lot to do with the exhaust. I also am under the impression that the XX revs higher than the Enzo. But that's just one mans opinion. I could be wrong I have been before.
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post #3 of 9 Old 05-12-2013, 08:35 AM
 
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Different (open) exhaust & longer duration camshafts. Enzo peak power at 7800rpm, FXX at 8500rpm & FXX Evo at 9500rpm.
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post #4 of 9 Old 05-12-2013, 09:10 AM Thread Starter
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Quote:
Originally Posted by C311 View Post
Different (open) exhaust & longer duration camshafts. Enzo peak power at 7800rpm, FXX at 8500rpm & FXX Evo at 9500rpm.
And you think that is the basic reason why it sounds so much nicer?

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post #5 of 9 Old 05-12-2013, 10:15 AM
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Consider that the FXX is a racing car so basically it doesn not need silencer...

"Engines are like women: you have to know how to touch them in the most sensitive parts."
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post #6 of 9 Old 05-12-2013, 11:07 AM Thread Starter
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Quote:
Originally Posted by Sw4n View Post
Consider that the FXX is a racing car so basically it doesn not need silencer...
So the Enzo has a silencer?

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post #7 of 9 Old 05-12-2013, 12:13 PM
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As far as I know every road car must have muffler in order to reduce the noise, according to dB limit established by law. So also Enzo must have some kind of silencer. For example I also own a 1996 Royal Enfield 350cc. If I run it without silencer is as noisy as hell, unbelievable... Far more noisy than my GT4. And it is just a 20hp monocylinder 350cc!!
Race cars follow different and less strict rules (but also circuits has noise limit) so the exhaust system is more open and so noisier.

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post #8 of 9 Old 05-13-2013, 02:00 AM
 
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The legal noise limit for modern road cars is 74dB at 50 kmh in 2:nd and 3:rd gear. Cars must be silenced to 75% of the peak hp. Example: Enzo peak at 7800 rpm so it must be quiet up to 5850 rpm. Above that rpm the exhaust system valves can open and bypass the silencers. The main reason for the valves is to keep silencer temperatures down and to avoid setting the car on fire after some hard driving. More aggressive camshafts make more power but also more noisy engine and also increase emissions. Enzo have 27.5 rpm controlled advance on the intake camshafts and 25 rpm controlled retard on exhaust camshafts to max out available power, low to high rpm and to manage emissions and also noise. Camshafts are adjusted by a separate oil pressure system, powered by an oil pump at the end of the left intake camshaft, controlled by Engine Control Units and activated (power on-off) by electric solenioid valves. FXX dont need to be road legal so noise and emissions are not an issue. Simply speaking, the FXX engine have much in common with the "A1GP by Ferrari" engine (8 cyl x 1.5 = 12 cyl)
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post #9 of 9 Old 05-13-2013, 02:37 AM Thread Starter
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Quote:
Originally Posted by C311 View Post
The legal noise limit for modern road cars is 74dB at 50 kmh in 2:nd and 3:rd gear. Cars must be silenced to 75% of the peak hp. Example: Enzo peak at 7800 rpm so it must be quiet up to 5850 rpm. Above that rpm the exhaust system valves can open and bypass the silencers. The main reason for the valves is to keep silencer temperatures down and to avoid setting the car on fire after some hard driving. More aggressive camshafts make more power but also more noisy engine and also increase emissions. Enzo have 27.5 rpm controlled advance on the intake camshafts and 25 rpm controlled retard on exhaust camshafts to max out available power, low to high rpm and to manage emissions and also noise. Camshafts are adjusted by a separate oil pressure system, powered by an oil pump at the end of the left intake camshaft, controlled by Engine Control Units and activated (power on-off) by electric solenioid valves. FXX dont need to be road legal so noise and emissions are not an issue. Simply speaking, the FXX engine have much in common with the "A1GP by Ferrari" engine (8 cyl x 1.5 = 12 cyl)
Thanx Thomas , very nice explanation!!!

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