modified tray for LS7 and LS9:
LS7 Teflon bladed crank scraper:
Our windage control items helped with the top performing LS engine in the 2013 Amsoil Engine Masters Challenge. http://www.popularhotrodding.com/enginemasters/1309_2013_amsoil_engine_masters_challenge_friday_coverage/viewall.html
engine scrapers and modified windage trays:
The tray shown is GM part number 12558189 which is the full length one.
There are multiple stock patterns that the same general modifications can be
The principal aims were to introduce a small amount of additional order to the
windage flow and to extract more entrained oil from the cloud. A divider was
used in the center to encourage the flow pattern to circulate in bays 1-2 and
3-4 rather than simply have chaotic flow over the third main. The louvers were
extended inward on the downstroke side and then had this element transition into
directional screening on the floor. This screening rises above the lowest
louver on the opposite side of the tray. This transforms the lowest louver
openings into drains (additional drain holes drilled as well). However, because
of the orientation of the screening openings (iterated small louvers) the total
amount of "louvered" area is greatly increased. The screening helps prevent oil
from bouncing back up after striking the interior tray surface and protects oil
that has passed through it and is then flowing out of the tray.
The uppermost upstroke louvers have been opened up a bit and the scraper serves
as a new and far closer edge to guide stripped oil into those openings and also
to reach in and disrupt the pressure differential of the windage cloud. The
scraper moves the windage tray approximately 1.5mm closer to the floor of the
Overall, this is an enhancement of the original design going beyond what is
possible with a single stamped piece of metal.
is thought that the destruction of these engines at high G's is mostly due to
oil migrating into the rotating assembly and being trapped by the windage tray
and the network of passages through and over the mains/webbing. It becomes
churned full of air before being ejected and this increased aeration is what
kills the bearings. Entrained air requires more time to be released than
simple foaming on the surface. The scraper and modified tray helps to more quickly extract
this oil while still allowing pumping exchanges between cylinders and bays.
The scraper and tray can be used independently of one another if desired.
Stroker and Teflon bladed versions of the scraper are available.
Important note: If you want
a tray to be modified for use in a stroker engine you must fit the
stock one to your rotating assembly and then send it to us.
The scraper is $69.95 (Teflon
$169.95) and the modified tray is $249.95 (no core required at this
Teflon bladed LS crank
Scraper specifically for the ZZ4 and ZZ430 crate motors from GM
L4: 2.2 liter / 134; 2.5 liter
engine (1988 block with gear on crank) $69.95