08-18-2009, 07:12 AM | #1 |
Drives: '18 5.7 RAM 1500 18' 1SS Join Date: Jun 2009
Location: CA
Posts: 156
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Piston to Valve Clearance?
Has any one run into any problems? About at what point would you have to swap out pistons? I know every cam setup is going to be a little different, just curious to see what does and does not work.
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08-18-2009, 11:53 AM | #2 |
HOOK'EM
Drives: 97 c1500/92 olds Join Date: Oct 2008
Location: Texas
Posts: 5,279
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good question but i don't think im gonna have that as a problem because i gotta keep it kinda streetable lol
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08-18-2009, 03:01 PM | #3 |
Any of this help?
Engine Mechanical Specifications (6.2L) Engine Type V8 Displacement 6.2L 376 CID Bore 103.241-103.259 mm 4.0065-4.0065 in Stroke 92.0 mm 3.622 in Compression Ratio 10.7:1 Firing Order 1-8-7-2-6-5-4-3 Spark Plug Gap 1.02 mm 0.04 in Block Camshaft Bearing Bore 1 and 5 Diameter 59.58-59.63 mm 2.345-2.347 in Camshaft Bearing Bore 2 and 4 Diameter 59.08-59.13 mm 2.325-2.327 in Camshaft Bearing Bore 3 Diameter 58.58-58.63 mm 2.306-2.308 in Crankshaft Main Bearing Bore Diameter 69.871-69.889 mm 2.75-2.751 in Crankshaft Main Bearing Bore Out-of-Round 0.006 mm 0.0002 in Cylinder Bore Diameter 103.241-103.259 mm 4.0065-4.0065 in Cylinder Head Deck Height - Measuring from the Centerline of Crankshaft to the Deck Face 234.57-234.82 mm 9.235-9.245 in Cylinder Head Deck Surface Flatness - Measured within a 152.4 mm (6.0 in) Area 0.11 mm 0.004 in Cylinder Head Deck Surface Flatness - Measuring the Overall Length of the Block Deck 0.22 mm 0.008 in Valve Lifter Bore Diameter 21.417-21.443 mm 0.843-0.844 in Camshaft Camshaft End Play 0.025-0.305 mm 0.001-0.012 in Camshaft Journal Diameter 54.99-55.04 mm 2.164-2.166 in Camshaft Journal Out-of-Round 0.025 mm 0.001 in Camshaft Lobe Lift - Intake 8.24 mm 0.324 in Camshaft Lobe Lift - Exhaust 7.77 mm 0.306 in Camshaft Runout - Measured at the Intermediate Journals 0.05 mm 0.002 in Connecting Rod Connecting Rod Bearing Clearance - Production 0.023-0.065 mm 0.0009-0.0025 in Connecting Rod Bearing Clearance - Service 0.023-0.076 mm 0.0009-0.003 in Connecting Rod Bore Diameter - Bearing End 56.505-56.525 mm 2.224-2.225 in Connecting Rod Bore Out-of-Round - Bearing End - Production 0.004-0.008 mm 0.00015-0.0003 in Connecting Rod Bore Out-of-Round - Bearing End - Service 0.004-0.008 mm 0.00015-0.0003 in Connecting Rod Side Clearance 0.11-0.51 mm 0.00433-0.02 in Crankshaft Connecting Rod Journal Diameter - Production 53.318-53.338 mm 2.0991-2.0999 in Connecting Rod Journal Diameter - Service 53.308 mm 2.0987 in Connecting Rod Journal Out-of-Round - Production 0.005 mm 0.0002 in Connecting Rod Journal Out-of-Round - Service 0.01 mm 0.0004 in Connecting Rod Journal Taper - Maximum for 1/2 of Journal Length - Production 0.005 mm 0.0002 in Connecting Rod Journal Taper - Maximum for 1/2 of Journal Length - Service 0.02 mm 0.00078 in Crankshaft End Play 0.04-0.2 mm 0.0015-0.0078 in Crankshaft Main Bearing Clearance - Production 0.02-0.052 mm 0.0008-0.0021 in Crankshaft Main Bearing Clearance - Service 0.02-0.065 mm 0.0008-0.0025 in Crankshaft Main Journal Diameter - Production 64.992-65.008 mm 2.558-2.559 in Crankshaft Main Journal Diameter - Service 64.992 mm 2.558 in Crankshaft Main Journal Out-of-Round - Production 0.003 mm 0.000118 in Crankshaft Main Journal Out-of-Round - Service 0.008 mm 0.0003 in Crankshaft Main Journal Taper - Production 0.01 mm 0.0004 in Crankshaft Main Journal Taper - Service 0.02 mm 0.00078 in Crankshaft Rear Flange Runout 0.05 mm 0.002 in Crankshaft Reluctor Ring Runout - Measured 1.0 mm (0.04 in) Below Tooth Diameter 0.7 mm 0.028 in Crankshaft Thrust Surface - Production 26.14-26.22 mm 1.029-1.0315 in Crankshaft Thrust Surface - Service 26.22 mm 1.0315 in Crankshaft Thrust Surface Runout 0.025 mm 0.001 in Cylinder Head Cylinder Head Height/Thickness - Measured from the Cylinder Head Deck to the Valve Rocker Arm Cover Seal Surface 120.2 mm 4.732 in Surface Flatness - Block Deck - Measured within a 152.4 mm (6.0 in) Area 0.08 mm 0.003 in Surface Flatness - Block Deck - Measuring the Overall Length of the Cylinder Head 0.1 mm 0.004 in Surface Flatness - Exhaust Manifold Deck 0.13 mm 0.005 in Surface Flatness - Intake Manifold Deck 0.08 mm 0.0031 in Valve Guide Installed Height - Measured from the Spring Seat Surface to the Top of the Guide 17.32 mm 0.682 in Intake Manifold Surface Flatness - Measured at Gasket Sealing Surfaces and Measured Within a 200 mm (7.87 in) Area that Includes 2 Runner Port Openings 0.3 mm 0.118 in Lubrication System Oil Capacity - with Filter 5.2 liters 5.5 quarts Oil Capacity - without Filter 4.7 liters 5.0 quarts Oil Capacity - with Filter - RPO KPS 5.7 liters 6.0 quarts Oil Pressure - Minimum - Hot 41 kPa at 1,000 engine RPM 124 kPa at 2,000 engine RPM 165 kPa at 4,000 engine RPM 6 psig at 1,000 engine RPM 18 psig at 2,000 engine RPM 24 psig at 4,000 engine RPM Oil Pan Front Cover Alignment - at Oil Pan Surface 0.0-0.5 mm 0.0-0.02 in Crankshaft Rear Oil Seal Housing Alignment - at Oil Pan Surface 0.0-0.5 mm 0.0-0.02 in Oil Pan Alignment - to Rear of Engine Block at Transmission Bell Housing Mounting Surface 0.0-0.1 mm 0.0-0.004 in Piston Rings Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Production 0.23-0.44 mm 0.009-0.017 in Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Service 0.23-0.5 mm 0.009-0.0196 in Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Production 0.44-0.7 mm 0.017-0.027 in Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Service 0.44-0.76 mm 0.0173-0.03 in Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Production 0.18-0.75 mm 0.007-0.029 in Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Service 0.18-0.81 mm 0.007-0.032 in Piston Ring to Groove Clearance - First Compression Ring - Production 0.04-0.085 mm 0.00157-0.00335 in Piston Ring to Groove Clearance - First Compression Ring - Service 0.04-0.085 mm 0.00157-0.00335 in Piston Ring to Groove Clearance - Second Compression Ring - Production 0.04-0.078 mm 0.00157-0.0031 in Piston Ring to Groove Clearance - Second Compression Ring - Service 0.04-0.078 mm 0.00157-0.0031 in Piston Ring to Groove Clearance - Oil Control Ring - Production 0.012-0.2 mm 0.0005-0.0078 in Piston Ring to Groove Clearance - Oil Control Ring - Service 0.012-0.2 mm 0.0005-0.0078 in Pistons and Pins Pin - Piston Pin Clearance to Piston Pin Bore - Production 0.002-0.01 mm 0.0008-0.0004 in Pin - Piston Pin Clearance to Piston Pin Bore - Service 0.002-0.015 mm 0.0008-0.0006 in Pin - Piston Pin Diameter 23.952-23.955 mm 0.943-0.943 in Pin - Piston Pin Fit in Connecting Rod Bore - Production 0.007-0.02 mm 0.00027-0.00078 in Pin - Piston Pin Fit in Connecting Rod Bore - Service 0.007-0.0022 mm 0.00027-0.00086 in Piston - Piston Diameter - Measured Over Skirt Coating 103.235-103.258 mm 4.064-4.065 in Piston - Piston to Bore Clearance - Production -0.036 to +0.016 mm -0.0014 to +0.0006 in Piston - Piston to Bore Clearance - Service Limit with Skirt Coating Worn Off 0.71 mm 0.0028 in Valve System Valves - Valve Face Angle 45 degrees Valves - Valve Face Width 1.25 mm 0.05 in Valves - Valve Lash Net Lash - No Adjustment Valves - Valve Lift - Intake 13.97 mm 0.55 in Valves - Valve Lift - Exhaust 13.22 mm 0.52 in Valves - Valve Seat Angle 46 degrees Valves - Valve Seat Runout 0.05 mm 0.002 in Valves - Valve Seat Width - Exhaust 1.78 mm 0.07 in Valves - Seat Width - Intake 1.02 mm 0.04 in Valves - Valve Stem Diameter - Production 7.955-7.976 mm 0.313-0.314 in Valves - Valve Stem Diameter - Service 7.95 mm 0.313 in Valves - Valve Stem-to-Guide Clearance - Production - Intake 0.025-0.066 mm 0.001-0.0026 in Valves - Valve Stem-to-Guide Clearance - Service - Intake 0.093 mm 0.0037 in Valves - Valve Stem-to-Guide Clearance - Production - Exhaust 0.025-0.066 mm 0.001-0.0026 in Valves - Valve Stem-to-Guide Clearance - Service - Exhaust 0.093 mm 0.0037 in Rocker Arms - Valve Rocker Arm Ratio 1.70:1 Valve Springs - Valve Spring Free Length 52.9 mm 2.08 in Valve Springs - Valve Spring Installed Height 45.75 mm 1.8 in Valve Springs - Valve Spring Load - Closed 400 N at 45.75 mm 90 lb at 1.8 in Valve Springs - Valve Spring Load - Open 1175 N at 33.05 mm 264 lb at 1.30 in - SK
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08-18-2009, 07:26 PM | #4 | |||
Truth Enforcer
Drives: anything I can get my hands on Join Date: Sep 2006
Location: anywhere and everywhere
Posts: 22,797
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Quote:
there are plenty of cam manufacturers working on the LS3 and L99 that will be able to tell you if you need to change your pistons, however, unless you go with a pure donkey-di@# race cam, you shouldnt have a problem with valve/piston clearance. that being said, the L99 and its VVT does require a little bit of finesse with the cams available for it as well as the tuning of the VVT to eliminate valve/piston contact. but I wouldnt worry about the clearance unless you are going with a truly radical cam setup.
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