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seppuku rights activist
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Discussion Starter #1
Exactly what determines whether a cam will sound chopy or lopey?
 

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Overlap
 

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Discussion Starter #3
HRJ said:
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.
 

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Discussion Starter #5
HRJ said:
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?
 

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Discussion Starter #9
GTO_Scott said:
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.
 

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Discussion Starter #13
CoronaDee said:
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?
 

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Oh So Close
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SickmonGTO said:
I'll have something for your ass soon enough. :punch:

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...
 

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Discussion Starter #15
Pez_Candy said:
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. ;)
 

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Wooohooo
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SickmonGTO said:
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.
 

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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..
 

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Pez_Candy said:
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:
 

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Discussion Starter #19
BRN2ROLL said:
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
 

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Roflmao.
 
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