Converter Problem/Question

[Mark Yacavone]

There's only a few things that can go wrong with a converter. Most of them are very noticable.
If the sprag doesn't hold or slips off the line ,stall speed will decrease dramatically.
If the sprag slips downtrack ,it won't do it consistently, so the numbers in the middle will vary.
If a pilot thrust bearing goes away, it will increase the clearance between the pump and the turbine and the stall and trap RPM will most likely increase.
Same for broken fins , but you'd have to have more than one or two broken.
In the last three cases mentioned , you'd have metal everywhere in the trans and the whole deal wouldn't last long.
My guess: The converter is not your problem.

[7820]

In my case it was the converter and Mark figured out for me. I had all sorts of poblems at the Pontiac Heaven Race at Speedworld. Thought it was ignition related.....changed everything. Talked to Mark and he nailed it.....rolled the sprag. Took it out when I got home and yep......rolled the sprag. No longer have a sprag of that type...I now have a mechanical diode.

When I launched the car it would slowly accelerate. Instead of running 9.0's at 150 I was running 10.80's at 146.

Thanks for the help Mark.

[Mark Yacavone]

Originally Posted by 7820

In my case it was the converter and Mark figured out for me. I had all sorts of poblems at the Pontiac Heaven Race at Speedworld. Thought it was ignition related.....changed everything. Talked to Mark and he nailed it.....rolled the sprag. Took it out when I got home and yep......rolled the sprag. No longer have a sprag of that type...I now have a mechanical diode.

When I launched the car it would slowly accelerate. Instead of running 9.0's at 150 I was running 10.80's at 146.

Thanks for the help Mark.

You're welcome, and that's why we have a m/d in Alex Kadar's 455 GTO . Man, those 455's are tough on roller sprags.