Hey guys, just installing my new crower stage 3's in a built b17 head, and have the cam degree card in front of me, but was wondering if you could help me out w/ how it converts to the settings on the cam gears I have. I'm rockin the skunk2 cam gears. Here's how the timing card reads:

INTAKE: Opens 35.5BTDC
Closes 47.5ABDC

EXHAUST: Opens 51.5 BBDC
Closes 23.5ATDC

LOBE SEPARATION: 100deg.

Thanks guys, I really appreciate it.

 

Does the timing tag say @ 0.050 lift?

You will need to

1. put a degree wheel on the motor,
2. find TDC on no. 1 cylinder,
3. set a pointer (peice of coat hanger) to TDC on the degree wheel where you found the motor to be at TDC,
4. set your valve lash to zero,
6. lock vtec
5. and put dial indicator on a the retainer in the same axis as the valve
6. read off the degrees of the degree wheel at 0.050 opening/closing for the in/ex cams.

Your numbers will be a lil different than the card due to stacking of tolerances in the motor and that most timing cards are done on a cam fixture and not the engine. What is important is getting the Lobe center that the manufacturer tells you to run.

Intake Lobe center = (duration / 2) - opening number (if in. valve opens before TDC usually does)

Exhaust Lobe center = (duration / 2) - closing number (if ex. valve closes after TDC)


Intake duration = 35.5 +180 + 47.5 = 263
Lobe Center = (263 / 2) - 35.5 = 96.

Exhaust duration = 51.5 + 180 + 23.5 = 255
Lobe Center = (255 / 2) - 23.5 = 104

Lobe Seperatin = (96 + 104 )/ 2 = 100


Modified by Rocket at 11:02 PM 5/31/2005

 

you are going to need a degree wheel....

IMO forgo that, put both cams at '0' (assuming '0' is TDC for first cyl aka static timing is correct) and tune...

confirm this with Brian Crower-

brian@crower.com

 

Actually, we don't happen to have a degree wheel here. I was hoping to have some way to convert those numbers to -1/+1 etc. on the cam gears themselves. Anyone know what it would read on the cams?