Quote:
Originally Posted by Tom, F&L GoR
At higher RPMs the difference between the synchro ring and gear is greater, so it takes longer for them to come to the same speed and allow you to engage. In an old 833 4-speed, I roughed up the bronze cone surfaces and it engaged much more quickly, until, of course, it wore smooth again.
Consequently, a thinner fluid should provide more friction on the cone surfaces to allow quicker engagement, so you are on track there. I don't think that the amount of bearing surface comes into play, simply the inertia of the metal spinning parts. Typical auto transmission fluid is 8 cSt, or an SAE 20.
With a thinner fluid you will probably hear "neutral gear rattle" or more. One successful fix has been to modify the clutch pedal ratio to get more clutch departure. Any slight drag on the clutch during shifting will make shifting more difficult; changing the ratio is like pushing the pedal down farther without having to push it farther...
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Tom:
let me give another slant. I just did some very interesting research. I mapped the clutch slave cylinder and clutch travel. I also sliced the slave in half and took some interesting pictures. I will post these very soon.
What I was leading to, no matter how you change the clutch stroke, the slave is only going to travel so far. The slave only travels 1/2" when you depress the clutch.The at-rest position of the slave will vary depending on the variables in clutch system. As an example, when I took mine apart, the slave ram was 1/8" away from coming out of the inner bore, hence, losing all the oil. That starting position is dependent on:
1. The pressure plate finger position, in other words the distance forward of the transmission. This is dependent on the design of the pressure plate/disc assembly.
2. The clutch disc thickness. As the disk wears the fingers move towards the transmission.
3. The length of the throw-out bearing.
I will post all the findings and we can discourse some more. Let me throw this into the fray. I weighed three different clutch disks. They were:
a. 4.25 lbs
b. 8.1 lbs
c. 6.0 lbs
Which one do you think will shift better?