427 SBF

89 Fox 427 said:
This doesn't make any sense to me. I'll have to investigate. My cam gear only has one dot, and my small brain can't understand how adjusting the tooth position of the crank sprocket would effect that valve events that much? Im not physically moving the crank more than a few degrees when using a different keyway
Click to expand...
When you degree the cam you will understand it better. Read it over a few times.
As far as the timing marks on the cam gear I've never saw that either. Any I've had just had multiple keyways on the crank sprocket or the vernier style which moves the cam sprocket
 
For some cams they make a bushing for the cam sprocket. You drill out the hole for the pin larger, and use a bushing with an offset to move the cam gear around.

Anyway, just plop her in there and degree it and see where you are at. Most incorrect cam installs is due to the timing set being made incorrectly. But from time to time the cam can be ground incorrectly.
 
89 Fox 427 said:
It would appear to me that the dot has the keyway in center of tooth.

The square has the tooth behind the keyway (advancing valve events?)

The triangle has the tooth forward of the keyway (retarding valve events?)

Click to expand...
So the square is making you rotate the crank forward to line up to the dot on the cam. So where is the cam in relation to the piston ? Is it "behind" more than 0 or "ahead" ? Are the valve events (opening and closing) happening sooner or later in the cycle ?
 
Mike Beck said:
For some cams they make a bushing for the cam sprocket. You drill out the hole for the pin larger, and use a bushing with an offset to move the cam gear around.

Anyway, just plop her in there and degree it and see where you are at. Most incorrect cam installs is due to the timing set being made incorrectly. But from time to time the cam can be ground incorrectly.
Click to expand...
Thats for chev. The sbf just has a single center bolt, not 3
But they make adjustable timing gears for the cam, without extra keyways on the crank sprocket. Cloyes makes one that uses the fuel eccentric, rollmaster has a vernier style, basically an inner and outer cam sprocket that bolts together and is adjustable
 
Mike Beck said:
For some cams they make a bushing for the cam sprocket. You drill out the hole for the pin larger, and use a bushing with an offset to move the cam gear around.

Anyway, just plop her in there and degree it and see where you are at. Most incorrect cam installs is due to the timing set being made incorrectly. But from time to time the cam can be ground incorrectly.
Click to expand...

Yeah, fuck it, I wouldn't give it another second of thought.
Degree it and you'll find out what's going on and if it doesn't seem right we'll talk about it.

EDIT: And by "talk about it" we'll argue about everything including why you should have a Cleveland. :p
 
Steve439 said:
Yeah, fuck it, I wouldn't give it another second of thought.
Degree it and you'll find out what's going on and if it doesn't seem right we'll talk about it.

EDIT: And by "talk about it" we'll argue about everything including why you should have a Cleveland. :p
Click to expand...
so if he puts it on 0 and gets 113° icl and the cam guy recommended 2° advance and fox doesn't want rpm what would you suggest he do. Or should he put it in on plus 2 and see what icl he gets ?
 
I'm going to assemble with the triangle lined up with the dot. Without it sitting in front of me it seems that would mean I'd back the piston btdc and the teeth would drop in the sprocket, therefore advancing it.. I think..
 
Next dumb thought, how far in the pan do you want the oil pickup tube to sit? I need to buy a new one.

Previously it sat 8.25 inches below the pan mounting surface on the block.
 
89 Fox 427 said:
I'm going to assemble with the triangle lined up with the dot. Without it sitting in front of me it seems that would mean I'd back the piston btdc and the teeth would drop in the sprocket, therefore advancing it.. I think..
Click to expand...
Yes, the triangle advances, not the square. I was trying to get you to think it through to help understand valve events. I believe you were thinking of the "crank" being advanced with the square
 
BOSS#1540 said:
so if he puts it on 0 and gets 113° icl and the cam guy recommended 2° advance and fox doesn't want rpm what would you suggest he do. Or should he put it in on plus 2 and see what icl he gets ?
Click to expand...

89 Fox 427 said:
I'm going to assemble with the triangle lined up with the dot. Without it sitting in front of me it seems that would mean I'd back the piston btdc and the teeth would drop in the sprocket, therefore advancing it.. I think..
Click to expand...

I won't give advice... but if I was doing this I would line it up dot to dot to start with.
 
89 Fox 427 said:
I'm going to assemble with the triangle lined up with the dot. Without it sitting in front of me it seems that would mean I'd back the piston btdc and the teeth would drop in the sprocket, therefore advancing it.. I think..
Click to expand...
So, what icl # do you expect to see with the triangle?
 
You must log in or register to reply here.
Back
Top