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**Magnus** · 12-09-2002, 11:50 AM

Wow, EXCELLENT POST!!!

I don't think you'd want such a radical cam.. as your low end torque would suffer quite a bit. Many people with big cams complain low end suffers quite a bit and you have to get up into the RPM's before you have your power.. and low end suffers dramatically.

You'd want more of a TQ cam and not much of an HP cam. How you would achieve that I'm not really sure. I'm going to have to think about this one... [img]smile.gif[/img]

Good post.

**pgriffith** · 12-09-2002, 01:03 PM

I really dont think I would go with something too radical. Everytime you put on lots of duration it moves the peak HP and TQ pretty far up in the RPM's. I would think something like a 206/206 112lsa might work. Keep it somewhat mild.

If you want I will sale you my cam its small but makes good mid range power.

196/196 .496/.496 115lsa 111ic. $75 for you.

**Dominic** · 12-09-2002, 04:12 PM

I agree pgriff, the 206 would beef it up nicely with relatively no lowend loss.

**THUPERMAN** · 12-09-2002, 05:09 PM

XE 212/206 .520 / .538 113 lsa

Make sure you have headers, and wait until Zooomer comes out with his new ported intakes before you get that.

T

[ December 09, 2002: Message edited by: THUPERMAN ]

**pgriffith** · 12-09-2002, 05:20 PM

<blockquote>quote:<hr>Originally posted by THUPERMAN:
XE 212/206 .520 / .538 113 lsa

Make sure you have headers, and wait until Zooomer comes out with his new ported intakes before you get that.

T

[ December 09, 2002: Message edited by: THUPERMAN ]<hr></blockquote>

I dont like that cam at all. its way too much lift. He says he wants something to run on near stock valvetrain. This cam will need new springs and modification to the head to make them work. Plus its alot of duration and lift to be making good low end power. Think smaller.

**Wicked 3800 V6** · 12-09-2002, 05:38 PM

I wouldn't particularly mind changing valvetrain (meaning springs and pushrods? or spr / push / rock?) if it's cheap.

My question still stands -- what cam specs do you change to increase torque (on a 3800)?

Seems like the offers so far are what appear to be "mild" cams. I guess that the "radical" cams all involve long durations, and I'm inferring that long duration = more hp at sky-high rpms. Should I go for less duration? LOL ... Mild increase in duration (205-210ish, not 215-220ish) and a smaller lobe sep? What about lift? (max it out to .500?)

Guess I'm trying to write the book: More lift = this, more duration intake = this, etc... (3800 specific where possible, and I'll go search for general info).

Very glad I could impress you all with a good post, hehe.

Edit: Damn, please don't tell me I'm already as good as I'm gonna get low end.

-Rob

[ December 09, 2002: Message edited by: Wicked 3800 V6 ]

**pgriffith** · 12-09-2002, 05:49 PM

<blockquote>quote:<hr>Originally posted by Wicked 3800 V6:

My question still stands -- what cam specs do you change to increase torque (on a 3800)?

Guess I'm trying to write the book: More lift = this, more duration intake = this, etc... (3800 specific where possible, and I'll go search for general info).

-Rob

[ December 09, 2002: Message edited by: Wicked 3800 V6 ]<hr></blockquote>

I think we all want to know exactly that but to be honest I dont think anyone from this board knows exactly what works. Not alot of us have cams and we are still expirementing and learning from each others cams.

I think we have found that a large duration cam will peak very high in the RPM and will sacrafice low end power.

I would still recomend somthing like:
206/206 .512/.512@1.6 rocker 112lsa 4 degrees advance. I think that should work for better low-mid range power. Im sure the car will still peak HP above 4,500 but it will still be alot stronger in the low-mid range compared to stock cam.

**Wicked 3800 V6** · 12-09-2002, 06:06 PM

From a website ... (http://www.co.jyu.fi/~rax/lobe.htm , not work friendly if you explore non-automotive)
Varying Lobe Separation Angle

/-------------------------------------------------------------------------\
| Tighten | Widen |
|-------------------------------------------------------------------------|
| Moves Torque to Lower RPM | Raise Torque to Higher RPM |
| Increases Maximum Torque | Reduces Maximum Torque |
| Narrow Powerband | Broadens Power Band |
| Builds Higher Cylinder Pressure | Reduce Maximum Cylinder Pressure |
| Increase Chance of Engine Knock | Decrease Chance of Engine Knock |
| Increase Cranking Compression | Decrease Cranking Compression |
| Increase Efective Compression | Decrease Efective Compression |
| Idle Vacuum is Reduced | Idle Vacuum is Increased |
| Idle Quality Suffers | Idle Quality Improves |
| Open Valve-Overlap Increases | Open Valve-Overlap Decreases |
| Closed Valve-Overlap Increases | Closed Valve-Overlap Decreases |
| Natural EGR Efect Increases | Natural EGR Efect is Reduced |
| Decreases Piston-to-Valve Clerance | Increases Piston-to-Valve Clerance |
\-------------------------------------------------------------------------/

Lobe Separation Angle
/-----------------------------------\
| Above 114 Deg. = Extremely Wide |
| 114-112 Deg. = Wide |
| 112-110 Deg. = Moderately Wide |
| 110-108 Deg. = Moderate |
| 108-106 Deg. = Moderately Tight |
| 106-104 Deg. = Tight |
| Below 104 Deg. = Extremely Tight |
\-----------------------------------/

Despite all that just above, it seems like 112 is a reasonable limit if I want to idle with the clutch in in traffic with the A/C on.

LS1.com had a good discussion on this a while back, but their damn server load thing is preventing me from finding it. I'll look later and post here.

That 206/206 sounds good ... any reason to split?

[ December 09, 2002: Message edited by: Wicked 3800 V6 ]

**pgriffith** · 12-09-2002, 06:16 PM

Remember a 112LSA on a 206 cam is going to have less overlap than a 112lsa on a larger cam. So 112lsa on that cam is not too agressive and it should idle fine.

**THUPERMAN** · 12-09-2002, 06:26 PM

<blockquote>quote:<hr>Originally posted by pgriffith:

I dont like that cam at all. its way too much lift. He says he wants something to run on near stock valvetrain. This cam will need new springs and modification to the head to make them work. Plus its alot of duration and lift to be making good low end power. Think smaller.<hr></blockquote>

Okay, great, that's your opinion.

Wicked, define your RPM range specifically and I'll adjust that cam if necessary.

T

**pgriffith** · 12-09-2002, 06:36 PM

"On the courses I'm mainly around 2k - 4.5k RPM"

**THUPERMAN** · 12-09-2002, 10:05 PM

<blockquote>quote:<hr>Originally posted by THUPERMAN:
XE 212/206 .520 / .538 113 lsa

Make sure you have headers, and wait until Zooomer comes out with his new ported intakes before you get that.

T

<hr></blockquote>

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