Anyone read it?
Personal experience inside a 727 ended in 1970 (727 B with factory reverse pattern full manual shift separator & transfer plates), so my memory is shaky.
The author quoted something like "600 ft/lbs is a huge load, and the torque converter doubles torque".
???
The stall ratio, typically 1.8 to 2.2:1 only exists for a few seconds (tenths in a fast car?) until the converter elements are all rotating, yes? Or is it more complicated?

I didn't think it gave any real useful info. Though the trans pictured was in need of repair, they talked like it was smoked. Then proceeded to use frictions in a street car that I don't feel are necessary in my 9.0 car, expensive. The worn parts they were worried about looked not all that terrible. Who is "Mr X"? Not impressed.
Doug

Hot Rod has become kind of like Playboy - You tell everybody you buy it for just the articles...... It’s been a long time since Hot Rod had any qualified editors or writers on staff – Just about every article is so poorly edited - it loses the important details on what was done and how to pass It on to the reader. The transmission article was just that pictures and little useful info.

Just came to the same realization recently after noticing the decline of quality content over the last couple years...I'll be canceling my subscription..

You must have missed my recent article in Hot Rod!

https://www.hotrod.com/articles/adding-h...ig-block-mopar/

No Andy I did not miss the article - but reading your posts here and then the article in Hot Rod I found the article lacking in detail and not up to your usual informative script - I really would be curios how much they edited your original submission

My articles usually don't get much editing, sometimes they catch a typo or add a comma or something but the content is never changed. The difference is that the articles have a short word limit and they are written for a general audience. Generally the tech content is in the captions rather than the text.

Didn't read the article but that's accurate, the torque input is multiplied by the stall ratio.

600ft/lbs is huge?

Even pretty mild street strokers will exceed that....... and a lot of the hotter street/strip stuff is closer to 700ft/lbs, with the bigger cube race builds over 800ft/lbs.

Here's something to think about auto vs manual- the auto's TC does multiply engine torque over 2x for the initial few tenths of a second, then it gradually settles down to a little over 1x before the shift. Even though that it only lasts for a couple tenths of a second, it's that initial torque spike that you have to build the rest of the drivetrain to handle with an automatic.

On the other hand a manual trans does carry more energy into the launch with higher launch rpm, but it's torque input/output is much more even over the 60' than an auto. Torque input from a manual is initially determined by the clutch's holding power (engine torque + inertia torque), but you lose that inertia torque when rpm drops far enough to synch with rising vehicle speed. At that sync point the clutch locks up and the engine starts to gain rpm, so torque input then drops to whatever the engine puts out at that particular rpm and accel rate.

...600ftlbs engine x 2 for the converter x 2.54 for 727 1st gear = 3048ftlbs on the hit. With a 3.55 gear that's 10820ftlbs at the tire, but that 2x hit only lasts for a few tenths of a second.
...600ftlb engine w/ 800ftlb clutch hit x 2.66 for 833 1st gear = 2128ftlbs on the hit. With a 4.10 gear that's 8724ftlbs at the tire, and that hit lasts until the clutch locks up, probably around 0.75sec or so.

The net result is that you can apply a higher average torque over your 60' with a manual, without exceeding available traction or strength of the rest of the drivetrain.

Now that we have the ability to manage the hit of a clutch, you might not really need those big tires or D60/9" upgrade

Grant