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Crank Trigger Shells


Flying Magnet style shell



AEM Infinity style shell
ATI now offers a custom crank trigger shell eliminating an additional pulley being bolted to your damper. ATI can place any number of magnets in the outer shell at whatever degree marks you wish. These crank trigger shells will work with “Flying Magnet” pick ups and other trigger sources. When placing your order, please have the desired quantity and location of magnets ready.


OD
Damper Style
Bolt Pattern
Part No.
Price
8.5"
3 RING
CHEVY
916380TR
$175.00
7.5"
2 RING
CHEVY
916960TR
$145.00
7.5"
3 RING
CHEVY
916680TR
$145.00
7.5"
2 RING - 4 MAGNETS STARTING AT 60°
CHEVY
916880TR-60
$145.00
7.5"
2 RING - 4 MAGNETS STARTING AT 55°
CHEVY
916880TR-55
$145.00
7.5"
2 RING - 4 MAGNETS STARTING AT 50°
CHEVY
916880TR-50
$145.00
6.7"
3 RING
CHEVY
916730TR
$145.00
6.7"
2 RING
CHEVY
916880TR
$145.00
8.5"
3 RING
FORD 4 BOLT
916384TR
$175.00
7.5"
3 RING
FORD 4 BOLT
916909TR
$145.00
6.7"
3 RING
FORD 4 BOLT
916915TR
$145.00
8.5"
3 RING
CHRYSLER
916383TR
$175.00
7.5"
2 RING
CHRYSLER
916611TR
$145.00
7.5"
3 RING
CHRYSLER
916612TR
$145.00
6.7"
3 RING
CHRYSLER
916694TR
$145.00
6.7"
2 RING
CHRYSLER
916697TR
$145.00
7.5"
AEM - 3 RING
916360-10AEM
$200.00
7.5"
AEM - 3 RING - 6-RIB
916364CSAEM
$225.00
6.7"
AEM - 3 RING
916711-10AEM
$200.00
6.7"
AEM - 3 RING - 6-RIB
916731CSAEM
$225.00
Pricing reflects cost added to new damper.

Note:
Cost is $250 if ordered as an outer shell only or as an option added to an existing damper. AEM trigger shells WITH 6 rib serpentine drives are a $275 option.

Additional charges:
5-8 magnets
9-16 magnets
17+ magnets
$50
$100
$150

6" shells hold a maximum of 16 magnets.
7" shells hold a maximum of 24.
8" shells hold a maximum of 28.


Trigger Shell Magnet Placement

In order to build a trigger shell correctly, the customer will need to provide the placement of the first magnet. This is NOT the degree of timing they want to run but rather the number at which the pick-up is pointing to when the TDC pointer is at the firing degree.

If the customer wants to run 32° of timing, they would rotate the engine to put the 32° mark at the TDC pointer. Then move the pick-up to the center of its travel (so they will have room for adjustment either way) and indicate the number the pick-up is pointing to. That will be the placement of the first magnet. So, when the magnet comes around and meets the pick-up, the engine will fire at 32°.

Most EFI set ups require the 1st magnet to be between 50° and 60°. This so they have the full travel within the timing map. In these cases, the customer will need to rotate the engine to the specified number, lets say 55°, so 55° is at the TDC pointer, now they must tell you what number the pick-up is pointing at and that is where we put the 1st magnet.
You may find that many are similar. This is due to most people using the commonly available pick-up brackets and running similar total timing numbers. We even offer three stocking trigger shells for Chevrolet based on the most commonly requested marks.
 
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