viewsonic

Bore Size: 4.000
Piston Stroke Length: 3.622
Piston Dome Volume: 0
Piston Deck Clearance" -.007
(Those should be the numbers for a stock ls2 bottom end. Correct me if I am wrong.)
Combustion Chamber Volume In CCs: 58
Head Gasket Bore Diameter: 4.030
Compressed Head Gasket Thickness: 0.045



What is the SCR?

ChevPower

iTrader: (8)

12.33 is what i came up with

PREDATOR-Z

Yeah aproximately 12.33 (actualy a little less)

viewsonic

Sweet thanks guys!

Thats the number I got too... Just making sure I was doing it right.


Now I need to get my cam card so I can figure out what the DCR will be exactly.

viewsonic

Anyone know where I can get one?

I googled... but only found ones you have to pay for...

jrp

iTrader: (16)

https://ls1tech.com/forums/advanced-engineering-tech/394937-updated-valve-event-dcr-scr-header-length-spreadsheet.html

exSSer

This is the one I used because I don't have Excell.

http://www.kb-silvolite.com/calc.php?action=comp[URL=http://]

viewsonic

Hmm I am doing somin worng...

I am getting the correct SCR (12.3) but the DCR is messed up. (I am getting like a 10.4 DCR... I have never calculated DCR before... so this is probably why I am off.)

Cylinder Head Volume (cc) 58
Piston Head Volume (cc) 0
Gasket Thickness (in.) .045
Gasket Bore (in.) 4.030
Cylinder Bore Diameter (in.) 4.000
Deck Clearance (in.) -.007
Rod Length (in.) 6.098 (Thats a guess?)

Cam info:
-------------------------------Intake-----Exhaust
Valve adjustment:--------------.000"------.000"
Lobe Lift:----------------------.370"------.370"
Gross valve lift 1.70 ratio:-------.629"-----.629"
Duration @ .050" tappet Lift:----243*------247*

Lobe seperation 112*

reccommended Intake cernterline 108*

specs at 108* intake centerline:

Valve timing at--------------------Open-------------------Close
.050" tappet Lift:----------Intake: 13.5* BTDC------------49.5 ABDC
--------------------------Exhaust: 59.5* BBDC-----------7.5* ATDC

specs at 108* intake centerline:

Valve timing at--------------------Open-------------------Close
.050" tappet Lift:----------Intake: 11.5* BTDC------------51.5 ABDC
--------------------------Exhaust: 57.5* BBDC-----------9.5* ATDC

SuperSporttruck

iTrader: (2)

what is this motor ? A stock 6.0L ? And you need the duration at .006

viewsonic

Yup.

Stock bottom end LS2

jrp

iTrader: (16)

you've got to use seat timing not .050"

viewsonic

How do I do this?

The info above is the only info I got.

jrp

iTrader: (16)

what lobes are these? does the cam card state .006*?

viewsonic

Cam card does not state .006*

viewsonic

I bought everything from flowtech, (pushrods, heads, cam) so Ed was able to callculate my DCR... I just wanted to be able to do it myslef.

Anywho.

This is what he told me:

12.3:1 SCR
8.75:1 DCR

This will be run on 93 octane. Wathca think?

jrp

iTrader: (16)

hmm, my FTI cam card had .006 and .050* duration. ask Ed for the seat timing if you'd like to calculate DCR yourself. he uses the whole comp catalog at his disposal so there's no telling what lobes he used.

my SCR was 12.03 and DCR 8.5 to be run on 91 oct. but the combo never saw the light.

slowride

iTrader: (3)

Comp has all the cam grinds listed in a pdf file if you look on the website. They tell the .006" timing in deg. If you know what style it is (xe, xer, etc) or the grind # you can figure it out.


Edit my bad the Comp website doesn't ofer the .006" numbers. I used J-rods spreadsheet to figure out the .006" numbers.

viewsonic

This help?

MSGHUFF

iTrader: (7)

This sheet has the lobe data : DCR Calc

pianoprodigy

iTrader: (1)

Yep, my calculator will lookup the lobes provided you enter the proper duration and lift as it is listed in Comp's catalog. Look at the tab titled lobe source if you can't get it to lookup the values properly.