Specifically, how different is the relationship of the crank gear to the cam gear when installing a cam ground for the Aus engine in a US
engine.
I'm degreeing my cam. I'm using an adjustable crank gear set to fit a SBF that has been adapted to fit the US 250.
Initial settings had me starting w/ the dots on the cam gear/crank gear oriented in the straight up position. With that done, and after double checking the method I was using to degree the cam, I got a reading that the cam was in at a 101.25 degree C/L.
It's supposed to be 112.
The crank gear that comes with this set (and all of the adjustable SBF sets for that matter) only allow you to retard the cam 8 degrees. Which I did. Running the process again now yielded a 109.25 C/L.
Evidently, one of several things has happened:
1. We mis-oriented the cam/gear when we drilled it, and located the dowels 12 degrees off.
2. There is a slight difference in the relationship between SBF gear sets (1-2 degrees).
3. The cam grinder may have been slightly off (1-2 degrees).
4. Usage of a completely different gear set other than stock has to be accountable for at least a 1 degree discrepancy.
I'm saying all of this because IDK if there's something I'm missing here.
The process I'm following:
1. Find TDC w/ piston stop. Orient degree wheel to 0.
2. Install dial indicator. I'm using a 5" extension on my dial indicator, and I am doing this w/ the head off, referencing off of the solid, roller lifter.
3. Roll the engine over until maximum lift is achieved (in my case .316, cam card states .314.5)
4. Zero dial indicator.
5. Rotate engine counterclockwise .050 take reading from degree wheel.
6. Rotate engine clockwise until dial indicator again reads .050, take reading.
7. Add those two numbers, divide by 2, That should equal C/L.
The only thing I havent done was question why my lift at the cam was 1.5 degrees different than spec (cam has assembly lube on it)
I didn't take all of my measurements from a clockwise loading of the chain.
Maybe my dial indicator isn't exactly vertical??
All I know is I need another 3 degrees.
The crank gear has room left for a custom cut to create a 11 degree install point,..the problem is where to get that done.
engine.
I'm degreeing my cam. I'm using an adjustable crank gear set to fit a SBF that has been adapted to fit the US 250.
Initial settings had me starting w/ the dots on the cam gear/crank gear oriented in the straight up position. With that done, and after double checking the method I was using to degree the cam, I got a reading that the cam was in at a 101.25 degree C/L.
It's supposed to be 112.
The crank gear that comes with this set (and all of the adjustable SBF sets for that matter) only allow you to retard the cam 8 degrees. Which I did. Running the process again now yielded a 109.25 C/L.
Evidently, one of several things has happened:
1. We mis-oriented the cam/gear when we drilled it, and located the dowels 12 degrees off.
2. There is a slight difference in the relationship between SBF gear sets (1-2 degrees).
3. The cam grinder may have been slightly off (1-2 degrees).
4. Usage of a completely different gear set other than stock has to be accountable for at least a 1 degree discrepancy.
I'm saying all of this because IDK if there's something I'm missing here.
The process I'm following:
1. Find TDC w/ piston stop. Orient degree wheel to 0.
2. Install dial indicator. I'm using a 5" extension on my dial indicator, and I am doing this w/ the head off, referencing off of the solid, roller lifter.
3. Roll the engine over until maximum lift is achieved (in my case .316, cam card states .314.5)
4. Zero dial indicator.
5. Rotate engine counterclockwise .050 take reading from degree wheel.
6. Rotate engine clockwise until dial indicator again reads .050, take reading.
7. Add those two numbers, divide by 2, That should equal C/L.
The only thing I havent done was question why my lift at the cam was 1.5 degrees different than spec (cam has assembly lube on it)
I didn't take all of my measurements from a clockwise loading of the chain.
Maybe my dial indicator isn't exactly vertical??
All I know is I need another 3 degrees.
The crank gear has room left for a custom cut to create a 11 degree install point,..the problem is where to get that done.