Is a 12" 3,000 rpm stall possible? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-06-2011, 02:20 PM
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Is a 12" 3,000 rpm stall possible?

I was recommended by the gents on this board to run a +3k with my engine set up

406 sbc
Vortec heads, mild work
rpm intake
10:1 compression
comp 284xe cam
current 3.55 gears, working on 4.10 as per recommended

N E way I was shopping for a converter when a local buildshop suggested a CUSTOM 12" that was built to stall at 3k. They said it was only used for a few passes and then swapped out. They're assuring me it's a high stall converter. All of my reading and research has contradicted making a high stall out of a big cased converter Can someone shed a light on what may be @hand?

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Old 04-06-2011, 04:07 PM
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Hi
converter size limits the amount of torque it can safely handle. larger-diameter converters have bigger parts, thatís not always best. Large fins mean the fluid can exert more bending forces and result in failure. In stock form, bigger converters also allow more torque multiplication and lower potential stall speed, but the internals can handle only so much torque before parts start breaking. Reducing the diameter of the converter reduces its ability to multiply torque, puts less stress on the fins, and raises the stall speed. So small converters are generally better suited to high performance engines with higher rpm power bands.

Other internal tweaks such as fin angle and stator design can have enormous effects on the converterís fluid coupling which changes stall speed and torque multiplication. So itís possible to build a 2,600 stall or a 4,000 stall in the same 10" housing just by varying the internal design. Building a converter to achieve the right flash stall while maintaining around-town drive-ability takes a combination of proper stator design and fin angle in the correctly sized case. While it may be possible to build a 7,000 rpm 11" converter it wouldn't be very good, starting with an 8" converter housing would be a smarter choice.
It's best to contact a converter mfg & talk with them about what would be best for your application.
Rich
Hughes Performance
2244 W. McDowell
Phoenix
AZ 85009

Art Carr Transmission Co.
877/ART-CARR
artcarr.com


TCI Automotive
Ashland
MS
(662) 224-8972
www.tciauto.com>

JW Performance Transmissions
1826 Baldwin St.
Rockledge
FL 32955
(321) 632-6205
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Old 04-06-2011, 05:31 PM
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A 12" converter with 3000 stall will be very inefficient, loose and sloppy. It is possible to make one, but it will be a lot slower than a 3000 rpm stall made on a 10" core.

You won't find a good converter company even offereing such a 12" converter, they wouldn't even consider it. Richard pretty much explained it all in the above post.

I would avoid Art Carr Transmission Co, it is no longer owned by Art Carr and I have seen many complaints about them concerning quality and service on two other Racer boards. Art Carr himself is back in business, if you want his expertise, at California Performance Transmission (CPT).
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Old 04-06-2011, 06:17 PM
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larger converter better cooling

I was told the shop said by it being a physically larger converter, it holds more fluid for better cooling and the internals are suited for high-stall high torque this cam requires. I didn't see why a shop would try to pass that science by if it's just not physically probable thank you for your responses
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Old 04-06-2011, 06:48 PM
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it is my understanding that Art Carr in Texas closed the doors in February 2011.

I had not verified that
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Old 04-07-2011, 04:38 AM
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Quote:
Originally Posted by Crosley
it is my understanding that Art Carr in Texas closed the doors in February 2011.

I had not verified that
That's what I heard also. Someone on another Forum said they were auctioning everything.
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