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Compression Ratio CalculationFormula to determine Compression Ratio.7854 x the number of cylinders x stroke x bore x bore = Total Cubic Inches(Total Cu. In.)__________________________ ÷ # cyl. =_________________________________ (Cu. In. per cyl.)(Cu. In. per cyl.)________________________ x 16.387 =___________________________________(cc per cyl.)_____________________________________ Gasket thickness+____________________________________ Deck thickness=____________________________________ Total.7854 x the number of cylinders x stroke (gasket + deck total) x bore x bore = Total Cubic Inches(Total Cu. In.)__________________________ ÷ the number of cylinders = (Cu. In. per cyl.)(Cu. In. per cyl.)________________________ x 16.387 = (cc per cyl.)_____________________________________ cc of gasket + deck_____________________________________ cc of combustion chamber-____________________________________ cc of dome+____________________________________ cc of valve reliefs or reverse dome_____________________________________ Total assembly volume_____________________________________ Assembly volume_____________________________________ Cyl. volume_____________________________________ TotalAssembly volume, plus cylinder volume, divided by assembly volume = Compression ratioImportant DimensionsAxial RingWidthPiston OrientationReplacement pistons for 8-cylinderChevy & Chrysler motorsDeck Clearance(Measured at TDC)Radial RingWidthTech InfoRod LengthCompressionHeight• Cylinders 1, 4, 5 & 8 are right pistons and haveintake Valve Pockets on right side.• Cylinders 2, 3, 6 & 7 are left pistons and haveintake Valve Pockets on left side.• 90 0 V-6 Chevy motors require 2 left and 4 rightpistons.Block Height93
Boring & Honing InstructionsAdherence to proper boring and honing procedure is essential to overallring performance. To ensure that the bore finish will retain an oil film, it isvital that the guidelines listed below are followed for cast iron bores.• Install and torque main bearing caps• Use torque plates. This simulates the distortion that occurs when thecylinder head is mounted to the block. (hint: After boring and honing, leavethe torque plates in place and fit/gap the piston rings to their respectivecylinders.)• Allow for a minimum of .003" excess material for use as honing stock.• Intermediate hone to within .0005" of finished size with #220-#280 gritstones. (With diamond stones use #280-#400 grit.)• Finish hone with #400 grit stone or higher. (Use #600 grit diamond stone.If using hand operated equipment, set drill speed between 200-450 rpm.)• Finish with an appropriate stone or tool to achieve desired plateau finish(see below).Surface FinishSunnen ® Stoner Grit Approx.CK ® & CV ® Size µRaEHU-412 .....150. ......47-52EHN-512 .....220. ......40-48JHU-525 .....220. ......30-36JHU-623 .....280. ......20-25JHU-818 .....400. ...... 7-14C30-C03-81. ..600. .......3-5SAE SpecificationsCast Iron / Moly-Filled Moly-FilledCK & CV 220 Grit 280 Grit 400 Grit70 Grit to -.003" ....70 Grit to -.003" ....70 Grit to -.003"220 Grit to size. ....220 Grit to -.001" ...220 Grit to -.0015"280 Grit to size. ...280 Grit to -.0005"400 Grit to sizeWhy a Plateau Finish?Plateau honing is the popular name for the process that replicates thecylinder bore surface finish normally produced by the rings after they haveworn down the surface peaks during "break in". This technique producesflat areas or plateaus (Rk) on the cylinder wall after finish honing by usinga very fine grit stone or a PHT type brush tool to remove the peaks (Rpk)from the surface. This lowers the overall roughness average (Ra) whilemaintaining valley depth (Rvk) in the cross-hatch pattern of the cylinderwall. A high Rvk value is very desirable for oil retention qualities and willsubstantially reduce "break in" time and increase ring life.Ra (Roughness Average) = Used to describe surface roughness as anaverage between the peaks and valleys that exist in a finish over a specifiedarea, usually micro inches.Example of Plateau FinishingOriginal Bore Size..............4.000"Oversize.............................0.030"Finish Size..........................4.030"SurfaceFinish µRaRough-to-size...................4.0250"................. 75-98First Finish.........................4.0290"................. 30-36Second Finish...................4.0295"..................20-25Third Finish.......................4.0300"...................7-14Rpk (Peaks) = Average peak height.Rvk (Valleys) = Average valley depth.Cross Hatch = The pattern of intersecting parallel lines left after finishhoning operations are completed. The smaller the intersecting angle, thelarger the area (Rk) between the hone marks.Cross Hatch PatternMaintaining the proper cross hatch angle is important for two reasons; 1. Oilretention on the cylinder wall and 2. The rate of ring rotation. Excessivelyshallow cross hatch angles can hinder or slow down the necessary ringrotation that allows dissipation of heat. It can also leave too much oil on thecylinder wall allowing the rings to skate over the surface leading to excess oilconsumption. Too steep of a cross hatch angle may not provide adequateoil retention and can result in dry starts and premature ring wear. A steeppattern angle can also create excessive ring rotation that will acceleratering and piston ring groove wear.How to Measure Cross Hatch Angle) 20-25degrees94
Page 2: Don't see whatya need?See pg. 5Pins
Page 6 and 7: Diametric Pin ChartPart # OD Length
Page 9: Diametric Ring ChartBore Size(In.)B
Page 12 and 13: Bore Size(In.)Bore Size(MM)Ring Wid
Page 14 and 15: Ring Compression SleevesPart Number

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