How to get the crisp V8-sound
06-05-2017, 08:16 PM
#21
Burning Brakes
Your L48 is a low compression engine. They sound kind of dull. High compression engines sound a lot crisper especially with the right cam and ignition timing. I think that is what you are referring to not hearing out of yours. A built engine would sound good through your exhaust.
Mike
Mike
This. Unless you up the compression ratio and cam, you will not get that crisp exhaust note.
same as the C3 systems
06-05-2017, 09:18 PM
#23
Race Director
My '03 was OK with Borla Stingers and a Magnaflow X pipe.
My '06 GTO with no mufflers didn't drone.
X/H pipes don't eliminate drone but they mellow/smooth it out.
06-05-2017, 10:44 PM
#24
Race Director
I have 2.5 on my C4 worked / roller 383 dual exhaust - below 70 mph the drone is real bad. I have a Hooker Comp headers, CROSSOVER PIPE AND leading brand dual pipes & dual mufflers .
I will have to do my 71 as the exhaust is original and starting to fail.
Has anyone used GIBSON mufflers - they claim no drone..
Would like to get an opinion, as I drive the car everywhere and enjoy the radio.
I will have to do my 71 as the exhaust is original and starting to fail.
Has anyone used GIBSON mufflers - they claim no drone..
Would like to get an opinion, as I drive the car everywhere and enjoy the radio.
Last edited by BLUE1972; 06-05-2017 at 10:48 PM.
06-05-2017, 10:46 PM
#25
Tech Contributor
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I have had a Y pipe on my '69 for years. It can still cause drone in the bodywork. I eliminated about 90% of the drone by adding an H pipe crossover right behind the header collectors where the crossover effectiveness is highest.
06-06-2017, 07:44 AM
#26
Drifting
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C3 of Year Finalist (track prepared) 2019
Engine makes a huge difference, compression and cam. I thought my twin 2.5" Magnaflow exhaust with X pipe sounded pretty dull until I stuck a high compression longish duration cam stroker engine in front of it. I have no drone whatsoever, fairly quiet on the highway, but a nice bark when you open it up.
Last edited by Metalhead140; 06-06-2017 at 07:48 AM.
06-06-2017, 08:41 AM
#28
Team Owner
OK I'll jump in, too. My higher compression (9.8) heads and cam made a noticeable difference in sound. I'm running CC duals, no cat and Magnaflow mufflers. And my experience with an H pipe is that it gave the idle a little deeper tone and did indeed get rid of some of the raspiness when you stick your foot in it.
06-06-2017, 10:12 AM
#29
Yup. A really crisp sounding engine requires more cam and compression combined with headers and a free-flowing exhaust. H-pipes will have more rasp. X-pipes will sound smoother. Chambered mufflers will have more rasp/cackle than straight-though designs. Even stainless steel exhaust systems sound different than mild steel. It's the complete engine/exhaust package that produces the sound everyone loves.
06-06-2017, 10:49 AM
#30
Drifting
I have a stock L48 in my 1976 Corvette. The exhaust is stock ram horn manifolds, but the rest has been modified to 2,5" dual exhaust w/ cat converter removed and magnaflow mufflers.
I am satisfied with the performance of the car, but I would like a more crisp V8 sound. Is that at all possible with a stock engine? Will it help me to install a set of headers? Or do I need to modify the engine?
If so what do I need to do? I want to modify as little as possible, as the engine runs great, and if it aint broken....
Appreciate any good advice
I am satisfied with the performance of the car, but I would like a more crisp V8 sound. Is that at all possible with a stock engine? Will it help me to install a set of headers? Or do I need to modify the engine?
If so what do I need to do? I want to modify as little as possible, as the engine runs great, and if it aint broken....
Appreciate any good advice
06-06-2017, 01:56 PM
#31
Melting Slicks
Closing the intake valve earlier and opening the exhaust valve earlier also will make a little crisper pop out of the exhaust. Opening the exhaust earlier on a lower rpm stock engine is not necessarily the best for performance though. The bottom end picked up from the early closing intake would be lost to some extent to the early opening exhaust.
Mike
06-07-2017, 09:29 AM
#32
Drifting
Closing the intake valve earlier and opening the exhaust valve earlier also will make a little crisper pop out of the exhaust. Opening the exhaust earlier on a lower rpm stock engine is not necessarily the best for performance though. The bottom end picked up from the early closing intake would be lost to some extent to the early opening exhaust.
Mike
Mike
06-07-2017, 12:33 PM
#33
Melting Slicks
Piston speed sets the demand, heads are the potential, cam is the brain that makes it all work. I look what the combination needs to do to achieve what the customer wants to do. If a head is capable of filling a cylinder quickly based on the demand, there is no point in keeping the valve open longer and wasting time.
Mike
06-07-2017, 12:59 PM
#34
Drifting
Mufflers cause the drone, i have Spintech mufflers on my car it droned so much it was louder than the wind noise with the windows down at 70mph. I replaced everything from the headers back with 2.5" stainless w/ x-pipe and dynomax vt mufflers, it removed so much drone I could hear the aftermarket gears whining where I couldn't before.
06-07-2017, 05:11 PM
#35
IMO, low compression N/A street engines never sound crisp to me regardless of cam timing. Although the old 9:1 Busch Series (?) motors sounded pretty good! Nothing crackles like a 14:1 compression motor. They just sound like money.
06-07-2017, 10:43 PM
#36
Le Mans Master
Rather than creating something with more bark than bite, I'd focus on the latter and let the former take care of itself. JMO
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Metalhead140 (06-08-2017)
06-08-2017, 08:19 AM
#37
Drifting
06-08-2017, 01:25 PM
#38
Melting Slicks
That would be my course of action too, but the he said he wanted to do as little as possible. I guess there are those who care about the sound more than the performance. Comp's line of Thumper cams are a testament to that. I don't get it myself, but different strokes for different folks.
Mike
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TheSkunkWorks (06-09-2017)
06-08-2017, 01:28 PM
#39
Team Owner
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St. Jude Donor '05
those cams sound horrible I dont get it; plenty that sound good and actually work
when you are moving more air through the motor youll get "that sound"
when you are moving more air through the motor youll get "that sound"
Last edited by cv67; 06-08-2017 at 01:30 PM.
06-08-2017, 01:49 PM
#40
Melting Slicks
Mike
Last edited by v2racing; 06-08-2017 at 01:50 PM.