Some interesting results... - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #16 of 22 (permalink) Old 04-21-2007, 07:06 PM Thread Starter
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Some interesting results...

Just another couple of comments I thought I would pass on -

Tubulator steels - apparently the holes in these steels are there to airate the oil as it passes over the plates. The more airation, the less drag.

Pack clearance - decreasing the plate clearance from 0.008" to 0.004" increases the "drag" by 70%.... and thats at only 1500rpm.

Increasing pack clearance - means a harder shift. Ours shifts so soft you barely feel it. I have done a "log" on our 2/3 shift and it shows the total time taken is around 1/4 of sec and definitely no flair?

Servo release - times can be "tuned" by changing to a heavier/lighter spring.

Take out of it what you will.....

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post #17 of 22 (permalink) Old 04-21-2007, 07:44 PM
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Some interesting results...

When a customer of mine wants a transmission that will be used more for the track than anything else I put in .010" per friction. It doesn't last as long but we proved that it was worth .2 seconds in the quarter with 500 HP. They shift hard but then at that HP range it had better shift hard.
Any bluing of the steels is probably not due to clearance issues, I agree with that assessment. There is more wrong than clearance problems. The only time I see blued steels is when the pressure goes away and the clutches slip. Warped valve bodies, pumps cavitating (I saw this in a tranny that was built commecially) when a deep pan is combined with a stock filter/pick-up and broken regulator springs can all cause pressure loss without apparent symptoms.
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post #18 of 22 (permalink) Old 04-21-2007, 08:52 PM Thread Starter
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Some interesting results...

Quote:
On 2007-04-21 19:44, PaulS1950 wrote:
The only time I see blued steels is when the pressure goes away and the clutches slip. Warped valve bodies, pumps cavitating (I saw this in a tranny that was built commecially) when a deep pan is combined with a stock filter/pick-up and broken regulator springs can all cause pressure loss without apparent symptoms.
Paul
Yes, I have seen this as well. When we added the pressure logger to the trans, we found we were loosing the pressure at the end of the 1/4 rather than during. What fluid was left in the pan was obviously running to the front of it and exposing the pickup. Something to watch for....
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post #19 of 22 (permalink) Old 04-21-2007, 09:05 PM
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Some interesting results...

Ok ,what about this? We hear about centrifugal apply of the high/reverse clutch at high rpm's. Some drill a small hole in the drum to apparently stop that happening. Would too little clearance cause the drag then?
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post #20 of 22 (permalink) Old 04-21-2007, 09:20 PM Thread Starter
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Some interesting results...

If it does happen, its only going to be in 1st, its not spinning in 2nd so no centrifugal force and is engaged in top gear.
There already is a small open hole in the piston to help stop this....whether its enough is open to discusion.
I think too little clearance in that situation may mean its starting to physically drag the pack if it is applying.... The steels and frictions are travelling opposite to each other in 1st as well which will also increase drag. If you wade into that tech paper, the drag loss is definitely rpm dependant....if they are travelling in opposite directions, that would effectively double the rpm and increase the drag significantly??
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post #21 of 22 (permalink) Old 04-23-2007, 07:33 AM
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Some interesting results...

Quote:
On 2007-04-19 09:26, clevelandstyle wrote:
Never burned a clutch or steel. I grind my own steels down to .060" and they have worked well now for 2 seasons.
Clevelandsylte, how due you grind your own steels? On a surface grinder?

Troy
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post #22 of 22 (permalink) Old 04-23-2007, 01:55 PM
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Some interesting results...

Yes. A surface grinder. It's an automatic grinder and I set it to take very small cuts to keep warpage down. It takes all day to cut a set the way I do it, but I just set it up and leave it to run while I'm doing something else. You can't rush it.

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