[Sicky]

Exactly what determines whether a cam will sound chopy or lopey?

 

[HRJ]

Overlap

 

[Sicky]

Overlap

Sorry for the N00b questions, but I've been researching this and cannot find a clear cut answer to a few questions.

In a nutshell, if I'm looking at a cam's specs, how and what do I use to calculate the overlap? Or is it simply the larger the duration, the larger the overlap?

Bascially what I am getting at is that I've always liked the sound of a lopey cam as opposed to choppy, but I don't want to sacrifice a lesser powerband for the sake of sound.

 

[HRJ]

Ohhhh, I totally misread your question.

Look here: http://www.ls1tech.com/forums/showthread.php?t=327734

 

[Sicky]

Ohhhh, I totally misread your question.

Look here: http://www.ls1tech.com/forums/showthread.php?t=327734

I've been looking at that one.

So take the S-Cam for example:
238/242 608/612 115LSA

Is this correct:

238/242 - Intake/Exhaust Duration
608/612 - Intake/Exhaust Valve Lift

And of course the 115 lobe separation angle.

What would the overlap of this cam be?

 

[MacDogg]

why worry about something you ain't getting, punk!

 

[Sicky]

why worry about something you ain't getting, punk!

I'll have something for your ass soon enough. unch:

 

[GTO_Scott]

You need to know the intake and exhaust timing events to determine the overlap.

 

[Sicky]

You need to know the intake and exhaust timing events to determine the overlap.

Now we're getting somewhere! Thanks Scott.

Anyone have the S-Cam cam card? HPE site has been down for most of the day.

 

[bigdisplay442]

read this..
http://www.hotrod.com/techarticles/proper_camshaft_selection/

 

[CoronaDee]

Now we're getting somewhere! Thanks Scott.

Anyone have the S-Cam cam card? HPE site has been down for most of the day.

As you requested.

 

[Sicky]

read this..
http://www.hotrod.com/techarticles/proper_camshaft_selection/

Good article...thanks.

So, I gather that the C-cam has more of a lopey sound than the S-cam, which is due to it's tighter LSA and smaller duration?

 

[Sicky]

As you requested.

Thanks CD.

It looks like, according to the card, the valve lift is 605/610...so why are the specs 608/612?

 

[Pez_Candy]

I'll have something for your ass soon enough. unch:

Um... I'm not a mechanic by any means, but if you put the cam there; then you really won't see much of an improvement in your car. However, MacDogg will have the sweetest sounding farts in Texas...

 

[Sicky]

Um... I'm not a mechanic by any means, but if you put the cam there; then you really won't see much of an improvement in your car. However, MacDogg will have the sweetest sounding farts in Texas...

And will finally pass an emissions sniffer.

 

[Baaa]

Good article...thanks.

So, I gather that the C-cam has more of a lopey sound than the S-cam, which is due to it's tighter LSA and smaller duration?

It does have a shorter duration and tighter LSA but listening to them side by side, they sound the same to me. Lopey as all get out in the LS2. Choppy/lopey in an LS1 due to smaller cubes and lower compression.

 

[HTRDLNCN]

compresion,airflow of heads,fuel and ignition timing will all change the
sound...Richen it up at idle and it will get a burbly/softer sound,,lean it out and it gets crisper/crackly ,,playing with ignition timing as well. Rpm it idles while in gear at a light will definately change the sound. Bring it down so it barely idles and it will sound like a top fueler, bring it up and it evens out,etc,etc..

 

[BRN2ROLL]

Um... I'm not a mechanic by any means, but if you put the cam there; then you really won't see much of an improvement in your car. However, MacDogg will have the sweetest sounding farts in Texas...

LOL. I thought he was waiting for his viagra to kick in...lmao.:stickpoke :judge: :gr_jest:

 

[Sicky]

LOL. I thought he was waiting for his viagra to kick in...lmao.:stickpoke :judge: :gr_jest:

Cialis beeitch. Know your role. When you see these ugly fookers all the time, you need a little "pick me up". :fawkdance

 

[BRN2ROLL]

Roflmao.