BILLETSFI APPROVED FLEXPLATE
This is a must with the high torque Cummins in conjunction with
a better designed torque converter that can transfer the torque
with no slip. The flex plate is bolted to the crank shaft, then
the converter is bolted to flex plate. The torque from your
Cummins is transfered to the flex plate, from the flex plate
to the torque converter then to your input shaft in the trans.
With increased torque from the engine and no slip out of the
converter it can crack and/or rip the center out of a stock
Sun Coast billet flywheels are CNC machined from a forging
for strength and reliefs are machined out between the converter
mounting area and the crank flange to enable some flex. We
designed our flexible billet flywheel with the understanding
that it needs to flex but at the same time we added extra
thickness to prevent cracking. We started with a better quality
material and a better manufacturing process to make it stronger.
Our flexible flywheel made or exceeded all the new SFI specification
29.3 requirements for materials, mechanical properties, design
and rotational integrity.
SFI certified flywheel flex plate is required on drag racing
vehicles running 11.99 and quicker in the 1/4 mile and 7.49
and quicker in the 1/8 mile, or any vehicle exceeding 135mph.
It was changed in 2008 from the 29.1 SFI specification to
the SFI specification 29.3 for automatic transmission flex
plates for diesel applications. The new rules for the flexplate
requires that the material can not be a stamped metal as
many OEM and aftermarket flex plates are. To maintain the
SFI specification 29.3 requirements, the flex plate must
be replaced every three years