What kind of cam is he running?

[Rosco347]

Just curious, but what kind of a cam would be used here to produce that kind of sound? My buddy has an e-cam in his 5.0 and when he get's on it, the rpms don't come up that fast.

example

Someone told me it's because it's a flat tappet cam vs. hydro roller. I would think it's duration or LSA.

 

[Rosco347]

anybody?

 

[XXBULLETSXX]

Dude I have no idea....but I want it too! Ya Baby Ya!!!!

 

[my66coupe]

With my stock cam, and my headman longtubes, open no mufflers, I can replicate that sound.........Soo ya judging by the clip I say its more of open pipe combo to acheive that sound.

 

[RaSMG]

those are solid cammed high compression racing engines, probably running on 110 octane and with no exhaust.

 

[ron67fb]

I think you're hearing all three cars in that video, with no mufflers even. You'd have a hard time replicating that sound on your own

The fast revs most likely come from lightened engine components; an aluminum flywheel for example.

 

[ddonaca351]

The speed at which an engine comes up through the rpm range is determined by power output (horsepower is a measurement of how quickly an engine can perform a given amount of work) and by gearing, not by the exhaust (other than its impact on the power output).

Dave-

 

[65ShelbyClone]

I'm with the others; really high compression, lighweight rotating assembly, and a really tall cam. I also doubt there is much in the way of exhaust.

 

[ron67fb]

The speed at which an engine comes up through the rpm range is determined by power output (horsepower is a measurement of how quickly an engine can perform a given amount of work) and by gearing, not by the exhaust (other than its impact on the power output).

Dave-

I believe he was talking about how fast it revved up in neutral, not under acceleration, since the cars in the video were on their way to their parking spots.

 

[Rosco347]

Yeap, that's what I was referring too.

 

[brianj5600]

A powerful motor will gain revs faster in neutral too. Big cam and lots of compression is all you need.

 

[Route666]

Yeh baby that's the "on the edge of self-destruction" high compression ratio beast machine sound I mentioned in another thread. High comp and big cam = nasty.

 

[ddonaca351]

I believe he was talking about how fast it revved up in neutral, not under acceleration, since the cars in the video were on their way to their parking spots.

Damn work firewall....

The same principal holds true.... the motor in neutral is trying to overcome the weight of its rotating assy. The more power the motor makes, the quicker (or crisper as I like to say) it will be. In the case of race motors they usually run the lightest of everything that they can get (and still live) cuz this frees up power. The motor is using up less of its power trying to overcome its own internal weight. ect.... so on.... but you get the idea.

DD