how to get that choppy sound...

[ScottMH]

am i correct that the camshaft has alot with producing a nice rough idle with the choppy exhaust? i really want a agressive idle tone and rumble. so does it have more to do with the lift, or the degress, or the centerline? or does it not have much to do with the cam at all?

[Musicman]

Pulling a couple of plug wires will give you a rough idle and a choppy exhaust    but I recommend an aggressive cam if your looking for performance 

[Purple440]

A tighter LSA will help with that, but if you're not setup right you'll lose performance. 

[OttawaCharger]

Comp Cams just come out with the Thumpr series camshafts.  They're supposed to give you that classic sound but I haven't seen any reviews on them yet. 

[mikesbbody]

Comp Cams just come out with the Thumpr series camshafts.  They're supposed to give you that classic sound but I haven't seen any reviews on them yet. 

I think the thumpr series are only availible for small blocks but i could be mistaken. you can download the sound from comp cam's website I wasnt all that impressed with it to be honest.

[Musicman]

You by a cam based it's performance characteristics, not for the way it makes your car sound... 

[Purple440]

You by a cam based it's performance characteristics, not for the way it makes your car sound... 

Listen to this wise man 

[firefighter3931]

You by a cam based it's performance characteristics, not for the way it makes your car sound... 

Listen to this wise man 

Idle "sound" is the last thing i consider when picking out a cam profile.....it's inconsequential (to me).



Ron

[ScottMH]

or you buy it for both...

[Purple440]

or you buy it for both...

No way, you buy a cam for your performance requirements based on your build, not sound.  If it happens to be "lumpy" at idle and matches your build then congratulations.  I'm living proof that picking the right cam can make or break your engine performance given the drive train.

[max]

i always use a tight LSA, like something in the 108 degree line and then install it in the engine with a 4 or 5 degree advance and they have always had a really nice sound plus great bottom end power.

[Ghoste]

Choose it based on performance and no other criteria and the rough idle will follow on it's own.

[Steve P.]

potato-potato-potato-potato-potato..............................   

[Mefirst]

Back when my 440 was still breathing, at idle it sounded like low, off key "Romp-pomp-ti-di, Romp-pomp-ti-di, Romp-pomp-ti-di..." At high RPMs it sounded more or less like "WROOOOOOOOAAAAAAAAAAAAHHHHHHHHHHHHHH"

/Tom

[Rolling_Thunder]

go 312*/312* duration on a 106 LSA     

[Purple440]

go 312*/312* duration on a 106 LSA     

Holy monkey!

[Chryco Psycho]

go 312*/312* duration on a 106 LSA     

That will work , I hope you can tune a carb though , it wont idle on anything less than the main circuit & no power under 3000 RPM ... but hey sound is everything right 

[0X01B8]

this might do it    --->  http://www.vroombox.com/vroombox/

[Duey]

this might do it    --->  http://www.vroombox.com/vroombox/

I like the "Vesp Scooter" option... 

[Foreman72]

just wanted to bring this back out...

get timing gears instead of a chain...

but this probably won't help anyone

[Mefirst]

.

[greenpigs]

Ask a tech at comp cams or some other manufactor and tell them what you want.

[Duey]

104* centers would do it! 

[c00nhunterjoe]

a gear drive will give you the "blower" sound to the untrained ear. wont change the idle lope at all.  my 292 cam makes great low end power, but really comes alive at 2500-3000. it idles great and i can start the car by reaching through the window and hitting the key. it putts around town at 1000 rpm with ease and has no hesitation taking off from lights or in city driving. all this with the crazy "lope" idle that this guy wanted in the begining. driveability is all about putting the right combo together and tuning it just right. if i had to do it all over again i would change the profile to idle as smooth as possible to get the max power yet sound stock.... ie- sleeper. my car is no sleeper as you cant mistake the sound of it. one of these days i will get the wife in the car with the camera to get some updated videos as the ones i have are without any tune-up, i just got the car going after sitting for several years and they are all on a blown tranny.......... she's a whole different machine now.

http://www.youtube.com/watch?v=mL2-43vYDYs

[Foreman72]

a gear drive will give you the "blower" sound to the untrained ear. wont change the idle lope at all.  my 292 cam makes great low end power, but really comes alive at 2500-3000. it idles great and i can start the car by reaching through the window and hitting the key. it putts around town at 1000 rpm with ease and has no hesitation taking off from lights or in city driving. all this with the crazy "lope" idle that this guy wanted in the begining. driveability is all about putting the right combo together and tuning it just right. if i had to do it all over again i would change the profile to idle as smooth as possible to get the max power yet sound stock.... ie- sleeper. my car is no sleeper as you cant mistake the sound of it. one of these days i will get the wife in the car with the camera to get some updated videos as the ones i have are without any tune-up, i just got the car going after sitting for several years and they are all on a blown tranny.......... she's a whole different machine now.

http://www.youtube.com/watch?v=mL2-43vYDYs

aha...i just saw choppy sound and figured i throw in...but its all good

[starai73racing]

comp cams definetly did good with their thumper cam sieries. i to like the rough idle and my thumper cam makes the car sit and shake at the stoplights!

[Ghoste]

Isn't it ironic that most of the guys with the really fast street driven cars are trying to find ways to make the idle smoother?

[c00nhunterjoe]

oh dont get me wrong, i love my idle and i have no issues with it. just saying it would be neat to have a 0 power loss but have a purring idle

[Steve P.]

Hahaha.... I agree, but I think the closest you can come to zero power loss and purring idle is an electric car. Oddly though, I like the idea of an electric car... I saw one on one of the science channels that was damn fast and did not spin the tires out of the hole... I was impressed...  Still need a recording of a rumble or something though.. 

[skip68]

    Electric motors are VERY powerful. 

[Rob R]

This is only the third time in 30 plus years that I've heard this question asked...