Originally Posted by blis
Hmm... I get the principles.. dont quite get the method... Ultimately the Clutch will throw the shoe (Clutch GAP + END PLAY ) before fully engaged.
Please correct me if wrong.. and I probably am..
The ENDPLAY is the amount of gap required to let the clutch free spin when not engaged.
The CLUTCH GAP is there to allow for heat to expand and the aggressiveness of the throw as the clutch spring will have more resistance the further it throws.
Think of it this way:
is the distance the clutch shoe
travels before engaging.
is the distance the clutch bell
travels before engaging.
Let's forget about endplay and talk clutch gap for now. When you set the clutch gap, you take the inner bearing and the shims off and measure the up and down play the bell has. Since the shoe will be travelling outside as the engine revs, you are effectively measuring the distance the shoe will be moving before engagement.
Let's say you just set the value to 0.7mm. So, now you got both
the clutch gap and the endplay at 0.7mm (Endplay is currently at 0.7mm since the bell has to move that amount).
Why not run the car like this? Well, if the bell has to travel 0.7mm outside for engagement, it will be slamming
itself against the thrust bearing every time the clutch engages. As you know this isn't exactly healthy for the bearing. Ok, then why not set the value to something like 0.1mm in the first place? Sure, had we set the gap to something like 0.1mm, the bell only has to travel 0.1mm and won't prematurely wear out the bearing. But now you have a car that bogs severely since now the shoe
also can't travel more than 0.1mm. Since the shoe can't gain enough angular momentum to transfer to the bell during the time it travels 0.1mm, the car bogs.
So what we want to do here is keep the clutch gap at 0.4-0.8mm so the car doesn't bog, while keeping the endplay value at <0.1mm so the bearing doesn't wear out
Now you take the bell off and add the inner bearing & shims under the bell. Since you are moving only the bell
outside, the clutch gap stays the same, while the distance the bell has to travel decreases
. Ideally that distance should be <0.1mm.
Now you have a car that neither bogs nor eats bearings
. If the car doesn't launch the way you want it to, try experimenting with the clutch gap but leave the endplay at <0.1mm. And yes every time you adjust the clutch gap, you have to re-adjust the endplay as well.
Did that make any sense at all? I don't even know what I just wrote..