Page 274 - 2017 Racecar Engineering Circle Track Parts and Accessories Catalog

CTR DETROIT TRUETRAC
CTR (Circle Track Racing) Differentials are engineered Truetrac’s proven helical gear design eliminates
exclusively for left turn racing. CTR provides 100% friction plates, cones and springs for maintenance
traction to the left rear wheel and differential action to free traction. Power transfer is so smooth, it literally goes
the right rear wheel. Ideally suited to late models, dirt unnoticed by the driver. Proven design, low cost and effec-
modifieds or sprints, the CTR allows the driver to stay tive performance make the Truetrac limited slip differential the ideal choice for
on the gas longer, enter the turns deeper and get back on a wide variety of vehicles.
the gas sooner for higher exit speeds. Axle Axle
Axle Axle Part No. Description Dia. Spline Ratios
Part No. Description Dia. Spline Ratios DET911A319 GM 7.5", 10-Bolt, 1975-89 1.16" 26 3.23-Up
DETR18703A CTR, Ford 9" 1.32" 31 All Exc. 2.72 DET911A415 GM 7.5", 10-Bolt, 1975-89 1.16" 26 3.08-Down
DET912A317 GM 7.5"/7.6", 10-Bolt, 1988-05 1.20" 28 3.23-Up
DET913A481 GM 8.5", 10-Bolt, 1988-96 1.32" 30 2.73-5.13
DET912A587 Ford 9", 1957-79 1.20" 28 All
EATON POSI DET913A586 Ford 9", 1957-79 1.32" 31 All Exc. 2.72
Automatic, limited slip units with carbon friction
clutches and forged gears consistently and reliably DETROIT LOCKER
deliver equal power to both wheels. Units are rebuildable. DET187SL17B
Axle The Detroit Locker, engineered for 1976-87 Ford
Part No. Description Axle Dia. Spline Ratios 9" rears with 31-spline axles, maximizes traction by
DET19557-010 GM 8.5", 10-Bolt Car, 1971-89 1.20" 28 2.73-Up
DET19559-010 GM 8.5", 10-Bolt Car, 1988-96 1.32" 30 2.73-Up delivering 100% of the power available to both drive wheels.
DET19603-010 GM 8.2", 10-Bolt Car, 1964-72 – 28 3.08-Up Engineered to keep both wheels in a constant drive mode, differen-
DET19663-010 GM 7.5", 10-Bolt, 1975-89 1.16" 26 3.23-Up tial has the ability to automatically allow wheel speed differentiation
when required.
NOTE: Compatible with all ring and pinion ratios except 2.72.

FORGED PISTONS
Diamond Pistons are forged from high strength 2618 or 4032 alloys, and are fully CNC-machined to deliver superior fit, finish and sizing. Pistons are sold in sets
of eight, complete with premium 8620 steel wrist pins and round wire type locks. Diamond also offers custom pistons, available by special order. Please ask one of
our sales persons for a custom piston order form, if desired.
Comp. Comp. Top 2nd Oil
Part No. Description Bore Stroke Rod Height Ratio Ring Ring Ring
Small Block Chevy
DIA11040-8* Racelite Flat Top 4.030" 3.480" 5.700" 1.550" 10.2:1 .043" .043" 3mm
DIA11052-8* Racelite Flat Top 4.030" 3.480" 6.000" 1.250" 10.2:1 .043" .043" 3mm
DIA11938-8 † Race Dome 4.155" 4.000" 6.000" 1.000" 14.6:1 .043" .043" 3mm
* SB Chevy compression ratios based upon a 62cc combustion chamber.
† SB Chevy compression ratios based upon a 64cc combustion chamber.

CHAMBER MOLD KIT DIA03-2000
Kit aids the custom piston process by allowing the reproduction of an existing combustion chamber, eliminating the need
to ship a cylinder head. Easy to use kit takes only minutes to complete and includes two part epoxy, mixing sticks, rubber
gloves, spark plug hole plug and complete instructions.

LOGAN MOUNCE MARK SCHAEFER
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