Can someone explain to me the attraction of a lumpy cam?

[IronFreak]

because racecar?







I love the sound of a large overlap cam. A properly built high performance engine is a symphony to my ears at idle, revving and full song. I do have favorite cylinder counts and crank shapes.

Go to a Top Fuel event and listen to a top fuel car warm up in the pits. If your soul doesn't stir when they switch over from alcohol to nitro, you might not have one.

I was going to reference top fuel as well. I remember my first time in the pits, 13 years old, heartland park in KS. Standing right behind the dragster, they cranked that monster over and my balls dropped, I had become a man. They switched to nitro and I could feel the oxygen getting sucked out of my own lungs, the pounding of those cylinder about crushed my chest cavity.

I'll never forget that experience. Overlapping lopey ass cams are the songbird of HP, embrace it!

#Merica!

[LJ851]

because racecar?







I love the sound of a large overlap cam. A properly built high performance engine is a symphony to my ears at idle, revving and full song. I do have favorite cylinder counts and crank shapes.

Go to a Top Fuel event and listen to a top fuel car warm up in the pits. If your soul doesn't stir when they switch over from alcohol to nitro, you might not have one.

[phreshkid]

I ran an aggressive cam in the ol' m10 for the 1600 and it was slightly lopey. I loved it. It really woke that engine up over 3k rpms. That car really moved.

[Rc 415]

I love choppy cams and v8's

[BlackbirdM3]

I hate the sound of V8s, especially american ones. They sound like motor boats. I run a huge cam, lots of lift, overlap and duration on the datsun and it idles pretty smoothly. I must say that a well tuned straight 6 with a big cam and good exhaust is one of the best sounds ever. Smooth like ripping silk.

Will

[varg]

It's not just the murrican muscle boys, OP. Even the honda kids, who hate muscle like nobody else, are getting in on the action.


I have to admit, I find a perfect sewing machine idle is kind of boring to the ears, I like how high compression engines with aggressive cams idle. Sure you can tune most of the lope out by making it rich and increasing idle speed, but where's the fun in that?

[ForcedFirebird]

Alot of big cams can be tuned to idle decently well I think. I think it can sound good, but after raising the idle up from this its has a bit better driveability.

Tune has a huge amount to do with the sound. I have actually messed with idle tunes and made people's m20's sound like a v8 muscle car. Here's a video of my old m20 with a stock cam and lopy idle tune...



The video in the OP sounds almost as if the cam was installed and it's using stock maps.

[TheTacoMan]

Alot of big cams can be tuned to idle decently well I think. I think it can sound good, but after raising the idle up from this its has a bit better driveability.

[z31maniac]

The sound has more to do with firing order and degrees of rotation between firings, their V8's fire at every 90 degrees.

Shhhhh, let the adults talk.

[ForcedFirebird]

The sound has more to do with firing order and degrees of rotation between firings, their V8's fire at every 90 degrees.

It has more to do with the lack of vacuum and large overlap as mentioned above. A radical cam in a 6cyl still lopes like that.

[goarmy]

The sound has more to do with firing order and degrees of rotation between firings, their V8's fire at every 90 degrees.

[IronFreak]

^Brother from another mother.

[Exodus_2pt0]

It's dat overlap. Kills idle but makes it scream up top.

Buddy had a ls2 GTO with the ms4 cam. That car pulled like a huge turbo 4 banger. It has zero torque but once you hit 4k hold on tight.

A lopey idle that isn't caused by a misfire is one of the best boner makers out there.

[BobombETA]

Sounds good on an inline 6 too ;)

[flyboyx]

its all bout that rev bout that rev NO IDLE

lol