2006-sportcomp1.pdf

JE Pistons opened its doors for business in

1947 with one simple objective, to supply the racing

community with the highest quality pistons and

components available in the marketplace. Although

times, people and equipment have changed, our

objectives and goals have remained constant.

Today, JE is the largest manufacturer of custom

forged racing pistons in the world. Offering the

shortest lead times in the industry and a 98%

order ﬁll rate, JE is the deﬁnitive source for

all of your high performance needs.

The JE complex in Huntington Beach, California encompasses over 60,000 square feet of the most modern performance piston manufacturing

equipment in the industry. JE’s implementation of the most advanced CNC machining technologies available, with over 75 state of the art CNC

machines in operation, emphasizes our commitment to deliver the highest quality pistons, pins, rings and components available today. Industry

leading processes like Ultra Crown®‚ a digital three-dimensional piston crown machining process, and Ultra Groove®‚ a machining operation that

provides unprecedented ﬂatness of ring grooves (tolerances to within 60 millionths of an inch), are some examples of that commitment.

Our fully staffed, climate controlled QC (Quality Control) department utilizes the latest equipment to ensure the highest quality pistons available

anywhere. F.E.A. (Finite Element Analysis), which predicts the thermal and structural stresses a piston will experience before it goes into service,

enables JE to test and race simulate our product before it ever sees a racetrack. Furthermore, the lessons we learn through our involvement in

racing series like NASCAR, IRL, NHRA and many others, translate directly into the high quality, precision custom and shelf parts that we offer to

you, our customer.

Our investment in technology and equipment is an investment in our future as well as our customers’.

We preserve that investment by remaining committed to the philosophy of our founders;

JE Pistons will always provide superior parts . . . developed through extensive research . . .

employing the latest high-tech manufacturing procedures and quality controls.

NOTICE: Due to the nature of performance applications, all JE Products are sold without any expressed warranty or any implied warranty of merchantability or ﬁtness for a particular purpose. JE Pistons shall not, under any circumstances,

be liable for any special, incidental or consequential damages, including, but not limited to, damages or loss of other property or equipment, loss of proﬁts or revenue, cost of purchased or replacement goods, or claims of customers of the

purchaser which may arise and/or result from the sale, installation or use of these parts. JE Pistons reserves the

previously manufactured.

All parts shipped F.O.B. Huntington Beach, California • All parts are not legal for sale on pollution controlled motor vehicles • All trademarks, names or logos are property of their respective companies.

JE PISTONS

TEL: 714-898-9763

FAX: 714-893-8297

CATALOG #CAS16

THE FACILITY

SALES & MANUFACTURING

Our customer service, sales and manufacturing are housed in

2 of the 3 modern buildings in the JE Complex. JE’s staff of

sales technicians and customer service support personnel

all share the same passion, racing. This is why JE offers the

highest quality professional and technical support for all

your piston and component needs. JE Pistons’ manufacturing

department is the largest, most modern facility for forged

performance piston manufacturing in the industry. JE has

over 75 late-model CNC machining and turning centers.

Our pistons are manufactured with CNC machines utilizing

“no set-up” technology. As a result of our advanced tooling

and ﬁxturing technologies, JE is able to provide the industry’s

shortest lead-times while maintaining the most consistent,

tightest tolerances in the piston industry. JE offers the highest

quality piston available today.

TECHNOLOGY CENTER

Our new Technology Center offers some of the most advanced piston

design and analysis technology in the industry. We maintain the most

modern climate controlled clean room inspection facility to assure

unrivaled quality assurance. This center includes equipment such as

Zeiss Prismo S-ACC CMM, Federal Formscan tester, Mahr-Federal form

tester, Taylor Hobson Proﬁlometer, Zeiss Metallograph, Ricardo’s ring

pack simulation code and the latest in non-linear FEA Code.

DISTRIBUTION CENTER

& WAREHOUSE

The completion of Building #3, a brand new warehouse and distribution

center in October of 2002 strengthened JE’s position as the undisputed

leader in the performance piston industry. Offering the most complete

line of shelf pistons, rings and pins available, over 6000 different part

numbers, and a 98% order ﬁll rate, JE has the product you want when

you want it.

PISTON TERMINOLOGY

JE VS. SRP

DOME HEIGHT

VALVE RELIEF

TOP LAND

TOP RING GROOVE

2ND LAND

2ND RING GROOVE

3RD LAND

OIL RING GROOVE

PISTON DECK

STD OIL DRAIN BACK

SPLIT OIL DRAIN BACK

JE designs are speciﬁ cally engineered

for extreme applications up to, and

including, professional competition.

In this environment, the higher

compression ratios, highest boost or heavy

nitrous usage necessitate the higher tensile strength

2618 aluminum alloy, other features are listed below.

• Application speciﬁ c forgings for an optimized,

uniform crown thickness

• Contact reduction groove to minimize frictional drag

• Accumulator groove for increased top ring stability

and sealing

• CNC-machined side relief with lower support band for

additional skirt strength

• Honed pin bores, double pressure fed pin oilers & wire

locks included

SRP Pistons are designed for street/strip

applications utilizing many compression ratio

combinations compatible with pump gas as

well as moderate turbo boost and nitrous oxide.

SRP sport compact pistons are forged from

4032 low-expansion aluminum alloy for smooth

and quiet operation.

applications utilizing many compression ratio

SIDE RELIEF

(FOR FULL ROUND PISTONS)

WRIST PIN HOLE/

PIN DIAMETER

LOCK GROOVE

PICK LOCK GROOVE

(AVAILABLE FOR WIRE LOCKS)

well as moderate turbo boost and nitrous oxide.

FORCED PIN OILER

(CENTERED OR SPLIT)

SINGLE OR DOUBLE

4032 low-expansion aluminum alloy for smooth

SKIRT

BOTTOM BAND

• Honed pin bores with single, pressure fed pin oiler

• More economical because of forged side reliefs

(reduces machining time) and thicker ring lands to

accommodate a wider variety of applications

• Double Spiro locks included

SLIPPER AREA

(COUNTER WEIGHT CLEARANCE)

TANG

VALVE LOCATION TERMINOLOGY

PISTON TO WALL CLEARANCE

EXH.

VALVE

STOP

Centerline Out is measured to

where a 90º valve relief cutter

would meet the deck to the

piston center line

< >

4032 ALLOY PISTONS

Bore Range Min. Clearance

Sport Compact 2.500 to 3.625 .0022 to .0028

Sport Compact 3.626 to 3.999 .0025 to .0035

EXHAUST

CENTERLINE

OUT EXHAUST

VALVE RELIEF

INTAKE VALVE

RELIEF

PIN C

4032 ADDITIONAL CLEARANCE GUIDE LINES

Drag Race +.0010 - .0020

Turbo/Nitrous +.0005 - .0010

Road Race +.0005 - .0010

PHYSICAL PROPERTIES OF 2618

Nominal Density 2.81 g/cc .100 lb/in3

PHYSICAL PROPERTIES OF 4032

Nominal Density 2.68 g/cc .097 lb/in3

INTAKE

CENTERLINE

OUT

< >

INTAKE

VALVE

STOP

2618 ALLOY PISTONS

Bore Range Min. Clearance

Sport Compact 2.500 - 3.625 .0025 - .0035

Sport Compact 3.626 - 3.999 .0030 - .0040

MECHANICAL PROPERTIES OF 2618

Tensile Strength, Ultimate 440 MPa 64,000 psi

Tensile Strength, Yield 370 MPa 54,000 psi

Modulus of Elasticity 74 GPa 10,400 psi

Fatigue Endurance Limit 125 MPa 18,000 psi

MECHANICAL PROPERTIES OF 4032

Tensile Strength, Ultimate 380 MPa 55,000 psi

Tensile Strength, Yield 315 MPa 46,000 psi

Modulus of Elasticity 79 GPa 11,400 psi

Fatigue Endurance Limit 110 MPa 16,000 psi

VALVE POCKET DEPTH MEASURED VERTICALLY

FROM THE PISTON DECK TO THE DEEPEST PART

OF THE VALVE RELIEF RADIUS

2618 ADDITIONAL CLEARANCE GUIDE LINES

Drag Race +.0010 - .0020

Forced Induction/Nitrous +.0015 - .0025

Road Race +.0015 - .0020

Filled block +.0015 - .0025

VALVE ANGLE

COMPRESSION

HEIGHT/

DISTANCE

COEFFICIENT OF THERMAL EXPANSION

2618 aluminum expands approximately 15% more than 4032 aluminum, thus the 2618’s initial piston-to-wall clearance has to be 15% greater.

This difference is most noticeable during a cold engine start. When cold, the 2618 piston can rock back and forth producing a slight noise until

the aluminum expands. Both types of aluminum have approximately the same clearances once the pistons have expanded and the engine is

running at operating temperatures.

GAGE POINT

.500” STD

(.275 WHEN SPECIFIED)

COMPRESSION HEIGHT

.020

COEFFICIENT OF THERMAL EXPANSION FOR 2618

Temperature Range Average Coefﬁ cient

ºC ºF µm/m • K µin/in • ºF

-50 to 20 -58 to 68 20.6 11.4

20 to 100 68 to 212 22.3 12.4

20 to 200 68 to 392 23.2 12.9

20 to 300 68 to 572 24.1 13.4

COEFFICIENT OF THERMAL EXPANSION FOR 4032

Temperature Range Average Coefﬁ cient

ºC ºF µm/m • K µin/in • ºF

-50 to 20 -58 to 68 18.0 10.0

20 to 100 68 to 212 19.5 10.8

20 to 200 68 to 392 20.2 11.2

20 to 300 68 to 572 21.0 11.7

8.347

5.433

1.175

3.437

CRANK C L

1.7 1 85

8.347

1.7185

5.433

0.020

1.175

EXAMPLE: BLOCK

HEIGHT

1/2

STROKE

ROD

LENGTH

BLOCK DECK

CLEARANCE

COMPRESSION

HEIGHT/DISTANCE

applications utilizing many compression ratio

combinations compatible with pump gas as

CUSTOM PISTONS

CUSTOM OPTIONS

TO ORDER CUSTOM PISTONS, PLEASE USE THE CUSTOM PISTON ORDER FORM LOCATED IN THE

BACK OF THIS CATALOG OR ON OUR WEBSITE WWW.JEPISTONS.COM

STANDARD CUSTOM

PISTON FEATURES

• Fully CNC Machined Piston for Consistent Quality

• Precision Machined CNC Ring Grooves for Better Sealing

• 2618 High-Strength, Low-Silicon Aluminum Alloy

• Diamond Turned Skirts

• Radiused Valve Reliefs

• Single Forced Pin Oilers

• Machined Side Reliefs on Full Round Forgings

• Pick Lock Grooves (for use with wire locks)

• Lock Grooves Machined for Carbon Steel Spiro

Locks (other options available)

VERTICAL GAS PORTS

CONTACT

REDUCTION

GROOVES

CUSTOM FEATURE CODES

LATERAL GAS PORTS

DOUBLE PIN

OILERS

CODE DESCRIPTION

PF Honed Pin Bore (Pin Fitting)

CD Contact Reduction Grooves

AG Accumulator Groove

LG Lateral Gas Ports (10*)

VG Vertical Gas Ports

VL Vertical & Lateral Gas Ports

UG Ultra Groove

UP Ultra Groove with Lateral Gas Ports (10*)

UV Ultra Groove with Vertical Gas Ports

DP Double Pin Oilers

BO 4 Bottom Pin Oilers

PV Plunged Valve Reliefs

TV Tulip Valve Pockets

NS Notch Skirt

OP Offset Pin

* 10 Gas Ports Standard, Additional

Gas Ports Incur an Extra Charge

ACCUMULATOR GROOVE

PIN FITTING

OIL SQUIRT NOTCH

CHAMFER PIN BOSS BOTTOM OILERS

OPTIONS SHOWN FOR

ILLUSTRATION PURPOSES ONLY

ULTRA DOME

SPIN BOSS WINDOW MILL

UNDER CROWN MILLING

CUSTOM PISTON

MOTOR/STYLE CODES

Code Description

(UD) Ultra Crown Dome (UC) Ultra Crown Inverted Dome:

The Ultra Crown machining process allows incredibly precise dome to cylinder

head tolerances. By mapping the exact shape of a piston or cylinder head,

optimum compression and quench characteristics can be achieved.

(CD) Contact Reduction Grooves:

The purpose of machining these grooves is to reduce the amount of

contact area against the cylinder wall when the piston “rocks over”.

Contact reduction also serves to disrupt the ﬂ ame travel into the crevice

area thus helping to reduce detonation.

SPORT COMPACT

(4 & 6 CYLINDER)

SPORT COMPACT

(8 CYLINDER)

102-2-2 Flat Top 2-Valve

102-2-4 Flat Top 4-Valve

102-3-2 Dish 2-Valve

102-3-4 Dish 4-Valve

102-1-2 Dome 2-Valve

102-1-4 Dome 4-Valve

MILLING OPTIONS

PB Plunge Bosses (Interior or Exterior)

SB Spin Boss

CB Chamfer Pin Boss

MC Mill Under Crown

MB Mill Pin Boss Width

WM Mill Skirt or Window Mill

FM Cavity Milling

SE Skirt Register

MU 3D Under Crown

101-2-2 Flat Top 2-Valve

101-2-4 Flat Top 4-Valve

101-3-2 Dish 2-Valve

101-3-4 Dish 4-Valve

101-1-2 Dome 2-Valve

101-1-4 Dome 4-Valve

(MU) 3D Under Crown Milling:

The Under Crown machining process allows for uniform deck thickness,

therefore creating a lighter and more durable piston.

(AG) Accumulator Grooves:

An accumulator groove is machined into the land between the top and

second ring. It provides additional volume where residual combustion

gases that have “blown by” the top ring can collect. This additional volume

helps to reduce pressure between the top & second ring, thus aiding in top

ring seal and minimizing ring ﬂ utter.

(VG) Vertical Gas Ports:

Vertical holes in the deck of the piston, allows combustion pressure to

directly enter behind the top ring on the power stroke, thus pressurizing

the area behind the top ring for greater ring to cylinder wall seal. During

the rest of the cycle, the ring has normal tension for reduced friction.

(Most commonly used for drag race applications).

(DP) Double Pin Oilers:

Double Pin Oilers deliver twice the amount of oil to the wrist pin as

compared to the standard single pin oiler.

CUSTOM PISTON

ORDER EXAMPLE

To calculate custom piston pricing, determine the motor type

(Honda, Mitsubishi, etc), piston style (ﬂ at top, dome, dish, or

inverted dome), and which custom piston options you require.

(LG) Lateral Gas Ports:

This process mills slots into the top of the top ring groove and provides a

pathway for combustion pressure to get behind the top ring. This process

helps to increase ring seal and is most common in circle track applications.

(UG) Ultra Groove:

Ultra Groove is a special ring groove machining process that provides near

perfect groove ﬂ atness and surface ﬁ nish. Tolerances are held to millionths

of an inch.

ULTRA CROWN

US One-Time Engineering Fee

UD Machining per Piston Dome

UC Machining per Piston Inverted Dome

(PF) Pin Fitting:

The pin bore is precision honed to attain an exact pin clearance. Clearances

typically range from .0003 to .0010 between the wrist pin and pin bore.

(NS) Notch Skirt:

Notching can be done on pistons for motors with oil squirters, or to avoid

contact between pistons and/or pistons and crankshaft.

DESCRIPTION CODE PRICE

Honda Flat Top 101-2-4 $X.XX

Pin Fit PF $X.XX

Contact Reduction CD $X.XX

Ultra Groove UG $X.XX

Vertical & Lateral Gas Ports VL $X.XX

Double Pin Oiling DP $X.XX

FORGED SIDE RELIEF

FS FSR - Forged Side Relief

FE FSR - external bracing and cavities

FC FSR - external and internal bracing and cavities

(PB) Plunge Boss and (CB) Chamfer Pin Boss:

Machining process that removes additional material for added weight savings.

(BO) Bottom Oilers:

This process machines one or two holes into the bottom of the pin boss to

assist in splash pin lubrication.

(SB) Spin Boss and (WM) Window Milling:

In certain applications window milling will remove a signiﬁ cant amount of

weight from the skirt of the piston while maintaining its strength and integrity.

Spin Boss refers to machining on the bottom of the pin boss, which removes

weight where it is not needed for strength.

(TV) Tulip Valve Pockets:

Most commonly used on Hemi and motorcycle engines, this process leaves a

raised area on plunged valve pockets to achieve maximum compression.

Code Description

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