Phate

iTrader: (2)

I just got my custom ground cam from Cam Motion and I plan on doing the heads and cam install next weekend...however, I have never degreed a cam and need to know what all of this stuff (on the paper that came with the cam) means:


Lobe size bc/ht IN: 1.535 EX: 1.535
Camshaft Data = 2 CRNK DEG
DURATION AT .05 IN
INTAKE - Rocker Ratio = 1.7
Lash 23 24 25 IN
EXHAUST - Rocker Ratio = 1.7
Lash 23 24 25 IN

INSTALL CAM ON * * below Cyl #1
Intake & Exhaust
LOBE SEPERATION = 116.2 CAM DEG
valve overlap = -19.2 CRANK DEG

INTAKE
valve open = -8 'BTDC
* CENTERLINE ----> 114.2 'ATDC
valve close = 41.2 'ABDC
DURATION ------> 213.2 CRANK DEG
lobe lift = .30543 IN.
VALVE LIFT ----> .51924 IN.
lobe area = 23.13 IN * DEG

EXHAUST
valve open = 44.4 'BBDC
* CENTERLINE ----> 118.2 'BTDC
valve close = -11.2 'ATDC
DURATION ------> 213.2 CRANK DEG
lobe lift = .30512 IN.
VALVE LIFT ----> .5187 IN.
lobe area = 23.13 IN * DEG


does this mean that I should degree the cam two degrees? If so, how do you degree a cam? Are there special tools that you need?

Thanks,

Scott

Plan B

Do you have a stock timing chain and sprocket set??? If so... straight up is the only option for you. <img src="gr_stretch.gif" border="0"> Or you can install one of these;



2 degree adjustments, but if the cam manufacturer say's straight up is best, then with this quality unit... it will land straight up! Good luck with a stock set up. <img src="gr_stretch.gif" border="0">

[ January 07, 2002: Message edited by: Plan B ]</p>

Phate

iTrader: (2)

I will be getting an adjustable timings chain if I need one to degree the cam, but I would like to have it ready.

Are those timing chains available now??? I was reading a thread earlier that people were having trouble with the adjustable timing chains...

Thanks,

Scott

TA_2001

Here is the standard dot to dot..

http://ls1info.com/article.php?sid=192&mode=&order=0

NVE THIS

iTrader: (1)

[quote]Originally posted by Plan B:
<strong>Do you have a stock timing chain and sprocket set??? If so... straight up is the only option for you. <img src="gr_stretch.gif" border="0"> Or you can install one of these;



2 degree adjustments, but if the cam manufacturer say's straight up is best, then with this quality unit... it will land straight up! Good luck with a stock set up. <img src="gr_stretch.gif" border="0">

[ January 07, 2002: Message edited by: Plan B ]</strong><hr></blockquote>


Hey, where can I get one of these babies?

Bryan

[ January 07, 2002: Message edited by: NVE THIS ]</p>

Phate

iTrader: (2)

Thanks for the info so far guys...so is there anyway to degree a cam with the stock timing chain, or do I definitely need an adjustable one? According to the data do I need to advance or retard this cam???

If I do need an adjustable one is the Rollmaster one the best one out there, or is the Comp Cams setup ok?

Scott

jmX

Most of the cams are designed to be installed straight up on the ls1...call whoever you bought it from and ask how it should be installed...whoever spec'd it out should know.

Degreeing a cam is a pita....hope your cam can just be installed straight up dot to dot

Raughammer

I "ALWAYS" degree the cams I install.

There is a good write up on my web page under the cam/head install link. (page 2)

Degreeing in your cam just means making sure the cam goes in as the manufacturer wants it to. All you're doing is making sure everything is "like it is supposed to be".

Now "advancing or retarding" your cam is actually changing the point of reference where your cam will be influencing the valve train.

To do that you will need either offset bushings or a timing chain sprocket that has different holes in it that will allow you to choose where you want it to be "zeroed" at.

Usually installing the cam straight up. i.e. "dot to dot" is sufficient.

Kilroy's 99 TA

The instructions I got with my cam says that Comp actually sets their cams up to be 4 degrees advanced dot-to-dot.