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

1

R1.225 DOUBLE PIN OILERS Double Pin Oilers (opposed to single pin oilers), in conjunction with our annular reservoir, can add twice the amount of oil from the cylinder wall to the wristpin bore. This is a standard option on any piston that receives forced pin oiling. 1.055

U RADIUS VALVE RELIEFS A Radius valve relief is created by using a form tool (or done in a 3D fashion) to roll the edge of the valve relief. Often times we generate radii from valve relief to valve relief (see VR Sweep) as well and this is used to improve flame travel and cross flow in the combustion chamber during the overlap stroke. VR SWEEP Swept valve reliefs relieve fuel puddling and shrouded valves for a better fuel curve and allow the engines operation to improve during the overlap stroke. I 3.18 .125 32 R1.260 TULIP POCKET(S) Valve reliefs that have a protrusion in the center of the valve pocket to match the underhead shape of the valves. This helps when max compression is the goal. H 90° 33.02 R1.300 Used to maximize quench while eliminating possible hot spots that promote detonation, radius domes also allow the piston to yield better flame travel. 33.85 1.333 .439 .430 Special engineering and manufacturing processes that matches the piston crown precisely to the cylinder head to get max compression when needed. This can also be used to regenerate a hand massaged piston crown on the CNC for ease of duplication. RADIUS DOMES 3.99 R.157 13.72 .540 8.13 .320 KELLERED DOME/ 3D CROWN MACHINING 1.335 PLUNGE POCKET(S) Valve reliefs that are machined in a plunged or circular fashion, designed to leave a boundary around the perimeter to achieve higher compression. 33.02 R1.300

1.160

BROACHES Broaches are horizontal slots in the pin bore designed to allow oil to enter between the wristpin and pin bore. Broaches are also used

H to accommodate the wristpin shape under compression, as it can become somewhat oval and needs room in order to alleviate galling. PIN FITTING The pin bore is precision honed to attain an exact

U pin clearance. Depending on the application clearances typically range from .0003 to as much as .003 between the wristpin and bore.

5.09 .200

I

C have better flame travel than a dome piston. Flame travel on dome pistons can be improved with “fire slots” and / or a combustion trough. PLUG RELIEFS AND FIRE SLOTS Various machined slots and reliefs that are used to promote clearance for the spark plug. The plug relief is generally a plunged ball end mill, where the fire slot is a trough in the piston that helps move the spark towards the exhaust side of the chamber. CLIP CUTS Additional cuts that are on the edge of the piston (generally near the valve reliefs) and used to deburr or un-shroud the valves while still on the CNC machine. STRAIGHT CUTS Cuts that are used to create the deck surface on a piston. These are generally used on 4 valve pistons and the compression height is generated from this cut. SLANT CUTS Cuts that are used over the valve reliefs in order to un-shroud the area around the valve. B B SECTION A-A EXHAUST 0.156 8° R0.830 SECTION H-H COMBUSTION TROUGH A term used to describe a feature on the piston crown between the intake and exhaust. Ignited air / fuel mixture on flat top and dish pistons typically

0.891

0.8660

0.120

6.86 .270

15.39 .606

20.17 .794

.492 MIN

33.34 R1.313

21.59±0.025 10.80 .425

61.47

.850±.001

2.420

67.69

D D

C C

.090 ±.010 LATERAL GASPORTS Lateral gas ports are horizontal slots in the top of the top ring groove and they provide a passage for combustion pressure to get behind and above the top ring, increasing ring seal with reduced radial rings. Lateral gasports are often used over the vertical option when carbon build up (which could clog vertical gasports) may be an issue. 1.400 ±.010 .450 REF .962 .937 .100 ±.010 32 .003 A A 11.81 .465 A E E

A A

A

.006 P.D. A

32

.355 ±.005

30°

45°

.430 ±.010

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