CP-CARRILLO CATALOG

SECTION S-S Design & Engineering PISTON FEATURES cont. R1.225 1.245

5.33 .210 2.46 .097 4.45 .175

Z

R1.225 FORGINGS AND BILLETS X-FORGINGS 1.055 1.160 1.335

1

U but include an additional rib to strengthen the deck of the piston and pin bosses. These too allow the use of shorter wristpins which promotes reduced wrist pin deflection. The box structure actually creates a “box” around the small end of the connecting rod. These pistons are not always lighter, but are typically stronger than traditional round style pistons and typical X-Forgings. I BOX STYLE FORGING Box type pistons also have their pin bosses moved inward toward the center of the piston, ROUND FORGINGS The most common type of forgings and have the side relief machined into the piston versus having it forged. Since machining the side relief takes place, it allows flexibility for different styles depending on the application and final weight of the design. The bottom band can be left on for use of buttons, or it can be machined off to remove weight or help large stroke engines that come out of the cylinder at BDC. H

X-Forgings are designed to minimize friction and reduce weight without compromising strength. They have the side of the piston forged and their pin bosses moved inward toward the center, allowing the use of a shorter wristpin. With the use of different strut angles and bracing, an X-Forging is configured by adjusting the weight balance between high and low stress areas.

90°

U same material as the forgings. This approach gives us the ability to create any geometry desired and is often used when a forging is not available for a H BILLET A billet is made from a bare aluminum cylinder (extruded bar stock) and is the 3.18 .125

32 R1.260

I given application, or they can be chosen for prototyping before a new forging design is released. Although we have many forgings, sometimes preference is still a billet, as it is a free-form process ensuring a perfectly matched result every time. We offer several different finishes on our billets and the price is determined accordingly. Depending on what tools can be used, how many edge breaks / rounded corners are preferred and tool step over on the program – all determine spindle time. We are also able to place the center of gravity in “X” and “Y” at the center point of the piston when feasible and create a balanced piston for tighter piston to cylinder head clearances. Shot peening is always an option on a billet and when done, it makes the fully machined underside appear very similar to a piston on a forging. 5.09 .200 3.99 R.157 13.72 .540 0.8660 0.891

0.120

B

C

6.86 .270

33.02 R1.300

8.13 .320

COATINGS HARD ANODIZE

.439 .430

SKIRT COAT / MOLY DRY FILM COATING The application of molybdenum to the piston skirt, used to reduce friction between the piston and the cylinder during engine operation. It also helps during cold start ups and high temperature operation where a substandard oil barrier on the

15.39 .606

.492 MIN Anodizing the piston reduces wear and material transfer. Anodizing can be done to the entire piston or a selective area depending on its usage. Anodizing the entire piston has been shown to be very durable in drag racing applications, but some pistons require only the ring groove(s) anodized in order to lessen the chance of micro-welding the ring to the aluminum groove. CERAMIC CROWN COATING 21.59±0.025 10.80 .425 .850±.001 B SECTION A-A EXHAUST 0.156 8° R0.830

20.17 .794

cylinder wall could exist. OIL SHED COATING

33.02 R1.300

33.85 1.333

33.34 R1.313 Applied to the underside of the piston, this coating reduces the reciprocating mass by repelling oil from internal moving parts.

61.47

2.420

67.69

This coating reflects heat into the combustion chamber and away from the piston crown, while lowering piston temperatures for increased part life. The engine can experience improved combustion and performance as a result of heat being reflected back into the fuel charge.

D D

C C

E E

A A

A WPC TREATMENT WPC is a treatment that enhances the surface to reduce friction by firing ultra fine particles

A

.450 REF

.006 P.D. A

.090 ±.010 the structure and creating a harder more durable final product. Its unique micro-dimple formation pattern greatly reduces friction and helps retain oil. .962 .937 .100 ±.010 32 .003 A 11.81 towards the surface of a piston or wristpin at very high speeds. The thermal discharge permanently changes the surface, strengthening .465 1.400 ±.010 32

SECTION H-H Consult your CP-Carrillo Tech Associate before deciding on which feature or coating works best for you.

A

.355 ±.005

30°

45°

.430 ±.010

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