Could any one here make a class in how the ferrari make that high and nice sound from the engine, not the V12 60 Valv. I say the V8 or the old V6 I6 they made sound like music for my.
This sound don´t come only for the 4 small pipes they have OR YES.
There is any way to reproduce this sound in a Lt1 engine.
The B&B triflow in their web have a vette sound, this sound very high but was a Ls1 not like a ferrari but very nice sound.

 

advanced tech? Umm... No, & grammer? Umm.. no LOL.

 

As far as my understanding goes, the Ferrari V8s us a flat plane crankshaft (180º) and that is a big factor in their higher pitched sound.
There was an article in Design News magazine bout five years ago on "Why Indy cars sound the way they do". I remember alot of talk on the flat plane crank and bank-to-bank firing schemes.

All that aside, I'm sure Ferrari spends a great deal of time in exhaust design..... trying to achieve that characteristic sound.

-Mindgame

 

Agreed.

I have a Corsa Touring catback on my C5. The sound vs. the Indy Pace Car edition is very different. Yeah, it's more like the "ripping canvas" sound of a Ferrari, but quieter.

A lot of the tuning is cancelling out the frequencies you don't want and leaving in the ones you want. IMO, the Ferrari sound has more of the higher frequencies and fewer of the lower "pushrod V8" frequencies. I suppose one could do a sound analysis of the Ferrari exhaust, then configure a SBC exhaust to emit the same frequencies. If you combine or mix the exhaust perhaps the flat crank sound isn't as important. Most flat crank or 180 degree headers on 2-plane crank V8s have two outlets without a mixing box (single muffler).

Corsa's tuning method is like a closed organ pipe: each pipe or chamber in the muffler cancels a given frequency based on the closed pipe's length. This can be done with pipes attached to the exhaust collector, or as Corsa does it, by partitions in the muffler making various length channels. The concept isn't new. It was used in the 60's.

 

I don't think we have any limits on grammar (or spelling ). Not everyone who posts here has English as a primary language. The are welcome to post.

 

Yes, poor grammar and spelling is tolerable but those people who miss keys....... should be burned at the stake.



-Mindgame

 

grammar

I love it!

 

I designed an inline muffler once for a school project. I didn't get to do to much testing with it, but you can also do inlines in a similar way. Change length of chamber, chamber diameter and then put them in different stages, ie go from small dia./short to a larger dia./long and so on. I ended the tube with supertrapp baffles to try and divert the sound away from where I knew the db mic was going to be placed. Would have worked but we ran out of time to fine tune it before the competition. Open without the supertrapp baffels ='d very loud right behind the car, with baffles it was pretty quite, step to the side and it got a little louder.

There are so many variables to mess with in an exhaust system to make it sound different/louder/quiter/appear to be quiet...that it could take you years to nail down a particular sound.

I think harley spent a lot of exhasust r&d time getting that german engine in the V-rod to sound as close to a standard V-Twin as possible given the radical change in engine design.

 

Thanks for the reply’s.
And yes English is not my primary language, I like to write here because are a very respectful forum and the best in advance tech, and in this way I can practice have fun and learn from people who want to share his knowledge to any one to have a question.
May this is not advance question but here is the place were you get the answers from people like Mindgame OldSStroker Injuneer and others expert.
So back to the post l read in some place, the Harley Davidson sound is copyright l don’t know if this is true but may they work in the exhaust like Ferrari do.
So is all relate to the exhaust and could be the little and thin pipes they used.

 

I dont know the howtos or whys, but a freind of mine went from Flowmasters to Magneflow mufflers on his 2000 GT mustang and the tone increased by several octaves. The higher pitch was night to day to the flowmaster. As a note the mufflers were within an inch of each other, so internal chambering and baffling had to be the culprit.

 

Well said Injuneer.

 

OldStroker makes a good point in regards to noise cancellation. By employing reactive and active noise cancellation (wave superposition), you could design an exhaust system which emits those desired frequencies.
The sound, to a great degree, is "tunable".

Take care

 

Ughhh..... Guilty as charged.

 

Hey.... wait a minute! Shouldn't that be "...... poor grammar and spelling are tolerable...... "



Somebody ought to try and control this thread...........

 

One of the reasons for the Harley sound is the uneven firing order, sometimes described as a "poTAto-poTAto-poTAto" sound.

Yes, a lot of time is spent by Ferrari making their distinct exhaust sound. As many people have discovered when they change their exhaust systems, getting a pleasing sound without having annoying resonances at some rpms while improving power is challenging. Often those resonances show up from about 1500-3000 rpm, right in the cruising range for most cars.

One of the things you can accomplish with "organ pipe tuning" or RSC (Reflective Sound Cancellation) as Corsa calls it, is very quiet exhaust when the flow is low like during part-throttle cruise, and then more noise at high flow, high power, high rpm operation. That's my kind of exhaust. Here's a link to Corsa's explanation.

CORSA RSC explained

Corsa does the tuning inside the muffler, but you could build your own LT1 system by welding "branches" onto your straight-through exhaust pipes and adjusting their length to tune the sound to what you like. (Ferrari?). The branches could be a lot smaller in diameter than the exhaust pipes, say 1-3/4 inches, and can join at 90 degrees because there is no flow in them, just sound waves bouncing back and forth. In fact, one of the Corsa mufflers has two 90 degree "branches" which disappear into a case. The tuning branches can have tight bends to fit them in the chassis.

If you try this, you probably want to consider an H-pipe if you plan true duals, or do all the tuning after the Y. Remember you won't need any muffler cases, so a true dual over-the-axle system may fit fairly well. You could also adapt a 3-1/2 inch single system with the muffler completely eliminated.

There may be some advantage to locating the "branches" at high pressure nodes along the exhaust pipe, but that is not necessarily mandatory.

Yeah, I've seen this done a long time ago by an OEM. The only production use was as resonators in the tailpipes, I believe. Corsa "resurrected" the concept. Good for them. I hope they gave credit to the engineer who did a lot of the pioneering work on it.

Good luck Farc, and don't worry about the grammar police.