SCREAMIN' PRO RACING PARTS EAGLE® - Harley-Davidson

TITAnIuM SST PISTOn rInGS
many Screamin’ Eagle ® Twin cam pistons feature the
latest, state-of-the-art Stainless Steel Twist (SST) piston
ring technology. Designed for long life, low ware, and
improved compression and oil control, Screamin’ Eagle
pistons with SST rings feature:
PISTon cuT aWay
1
1
2
3
Top compression ring – The asymmetrical barrel-faced
ring is shaped to twist toward the piston crown to improve
sealing in the ring groove. The titanium nitride stainless
steel construction provides an exceptionally hard wearsurface
that can’t delaminate like traditional chrome or
moly coatings, and the thin ring quickly conforms to the
bore to maximize compression.
Second ring – The hook-shaped Napier face of the cast
iron second compression ring is designed to efficiently
remove excess oil from the cylinder walls, reducing detonation
and carbon build-up in the combustion chamber.
oil rings – Three-piece nitride stainless oil ring rails work
in conjunction with the Napier second ring to reduce oil
consumption and blow-by. The low-tension F-Type design
reduces frictional loading, and is ideal for use in engines
with high scavenging volume oil pumps.
2
3
Displacement
95 c.I.
Piston Type
cylinder head/Piston combination compression ratio chart
Original Equipment
and CNC-Ported
Factory Cylinder Heads Kompressor Heads CNC Ported MVA Hurricane Heads
SE cast Big Bore Flat-Top Pistons P/N 22851-99a 9.4:1 10:1 N.a. N.a.
SE cast High-compression Pistons for stock Tc 88 ®
heads only P/N 22661-99a
10.25:1 N.a. N.a. N.a.
SE Forged High-compression Pistons P/N 22868-00a 9.6:1 10.5:1 N.a. N.a.
96 c.I. Original Equipment 9.2:1 10.3:1 N.a. N.a.
103 c.I.
110 c.I.
SE cast Flat-Top Stroker Pistons P/N 21966-07 10:1 10.5:1 N.a. N.a.
SE Forged Flat-Top Stroker Pistons P/N 22942-00a 10:1 10.5:1 9:1 N.a.
SE Forged High-compression Pistons for stock
Tc 96 heads or kompressor Heads
P/N 22144-08B
SE Forged Stroker Pistons for cVO 110 or cNc
Ported mVa Heads P/N 22137-08B
SE Forged race High-compression Pistons for
cVO 110 or cNc Ported mVa Heads P/N 21928-08a
10.5:1 11:1 N.a. N.a.
N.a. N.a. 10.5:1 N.a.
N.a. N.a. 11.1 N.a.
Original Equipment (cVO) 9.3:1 N.a. 9.3:1 N.a.
SE Forged High-compression Pistons for cVO 110 or
cNc Ported mVa Heads P/N 22502-07
N.a. N.a. 10.5:1 N.a.
113 c.I.
SE Forged High-compression Pistons for cVO 110 or
cNc Ported mVa Heads P/N 22571-07B
SE Forged race High-compression Pistons for
cVO 110 or cNc Ported mVa Heads P/N 21915-08a
N.a. N.a. 10.5:1 N.a.
N.a. N.a. 11.1 N.a.
120 c.I.
SE Pro Twin cam Forged Piston kit for 4-5/8" Stroke
P/N 22574-10
SE Pro Twin cam Forged Piston kit for 4-5/8" Stroke
P/N 21900001
“n.A.” denotes not applicable – these combinations are not recommended.
N.a. N.a. 10.5:1 10.5:1
N.a. N.a. 12.1 12:1
Displacement calculation:
π x r 2 x stroke x 2 cylinders
Where π = 3.14, and r = (bore diameter/2)
NOTE: High-compression Piston applications require installation of
appropriate compression release in cylinder heads.
cylInDEr hEaDS & PISTonS 75
TWIn CAM MODeLS