Webster Engine - Bill of Materials : Sheet1
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Webster Engine - Bill of Materials and Required Tools
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This bill of materials is based on the engine and plans in the link below. Sheet references are to the plans linked to below. This list is believed to be complete, but is not gauranteed to be free of errors. Required screws and springs have been color-flagged for easy reference.
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Site for original Webster engine:http://home.comcast.net/~webster_engines/
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Link to plans (PDF format):http://home.comcast.net/~webster_engines/Plans.zip
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No.SheetDescriptionMaterialQtySize (inches)Comment
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12Base plateAluminum alloy14.938 x 8.125 x .375 (3/8")
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23Side frameAluminum alloy12.5 x 5.625 x .313 (5/16")
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33Crankshaft supportAluminum alloy12.125 x 2.5 x .313 (5/16")
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43Screws
46-32 x 3/4, flathead
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54CylinderCast iron or 12L14 Steel11.5 diam. x 2.5 L
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64Cylinder head frameAluminum alloy12.75 x 1.5 x .75
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74Screws44-40 x 1, flatheadFor cylinder head
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84Screws26-32 x 5/8, flatheadTo attach frame
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94Screws44-40 x .9, flatheadTo attach valve block
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105FlywheelCast iron or CRS13.750 diam. x 1.125Can use any heavy metal (e.g. dumb-bell)
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115Crankshaft - shaftCRS10.5 diam. x 3.5Make crankshaft in 3 pieces and silver solder
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125Crankshaft - crankCRS11.25 x .5 x .219Larger if balanced
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135Crankshaft - pinCRS1.281 diam. x ~.6
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145Crankshaft spacerCRS1.5 diam. x ~.218
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155Main bearingbearing bronze2.563 diam. x ~.4
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166Piston6061-T6 aluminum1.873 diam. x 1
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176Oil tubebrass1.094 diam. x .188
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187Connecting rod6061-T6 aluminum1~3.6 x .563 x .313
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197Wrist pindrill rod1
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207Wrist pin bushingbearing bronze1.250 diam. x .313
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217Con rod bushingbearing bronze1.375 diam. x .313
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228Rocker armCRS (optional case harden)14.329 x .219 x .313
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238Rocker arm springspring steel1~3.1 x .281 x .010
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248Rocker arm washerbrass1.250 diam. x .015
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258Rocker arm spacerCRS1.250 diam. x ~.105
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268Screw, Tappet#4-40 SS screw14-40 x 3/8", hex headTap bolt with hex head
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278Cam shaftdrill rod1.250 diam. x .938
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288Exhaust camCRS (case harden)1.712 diam. x .185
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299Spur Gear - Berg P32S28-24SS132 Diametral Pitch; 20 Pressure Angle; 24 Teeth; 3/4" Pitch Diameter; 3/16" Face Width; 1/4" Nominal; 303 Stainless Steel (~$30)
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309Spur Gear - Berg P32S28-48SS132 Diametral Pitch; 20 Pressure Angle; 48 Teeth; 1-1/2" Pitch Diameter; 3/16" Face Width; 1/4" Nominal; 303 Stainless Steel (~$38)
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319Cam gear washerCRS2.5 diam. x .063
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329Ignition camCRS1.688 (11/16) diam. x .375
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3310Valve blockAluminum alloy11 x .625 x .25
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3410Intake valve blockAluminum alloy11 x .625 x .25
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3510Exhaust valve blockAluminum alloy11 x .625 x .25
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3611Valve guideBronze/brass2.375 diam. x .625
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3711Spring, intake valvemusic wire10.013
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3811Spring, exhaust valvemusic wire10.022
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3911Valvedrill rod2.250 diam. x 1
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4011Valve retainersteel2.250 diam. x .094
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4111Retainer pindrill rod, music wire, etc.2~.040 diam. x .25
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4211Screws42-56 x .75, flatheadFor valve block assembly
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4312Venturibrass1.375 (3/8) diam. x ~1.2
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4412N.V. Blockbrass1.188 (3/16) diam. x .375
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4512N.V. Seatbrass1.188 diam. x .532
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4612Needle valve knobbrass1.250 diam. x .188
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4712Screw, needle valve2-56 x .75 screw12-56 x .75 screw, socket head
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4812Springmusic wire10.013
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4913Head gasketcopper, teflon, or auto gasket11.50 diam. x 0.015May not be needed but use to be on safe side.
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5013Exhaust pipeAluminum, brass, or steel1.375 (3/8) diam x 2.250
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5113Con rod keeperbrass or steel10.5 diam. x 0.015
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5213Crank oiler cupbrass2.375 diam. x ~.5
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5313Crank pin grease cup body5/16" hex brass15/16" hex x ~.5
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5413Crank pin grease cup capbrass1.375 (3/8) x .325
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5514Cylinder oiler bodybrass or aluminum1.750 diam. x ~1.2
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5614Screw, cylinder oiler valve14-40 x 1.125, socket head
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5714Cylinder oiler springmusic wire10.020
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5814RC carb adapterbrass or aluminum1Needed if using a carburetor instead of venturi
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5921shoulder screw1/8" x 3/8"#4-40 Commercial, 0.124" Shoulder Dia., 0.375" Shoulder LG., 303 Stainless Steel
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6021piston ringsgrey iron, fine grained cast iron23/32" X .875"optionally, use an o-ring
Purchase from Otto Gas Engine Works:
http://www.pistonrings.net/rangcast.htm
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6121roll pin0.093 x 5/8"2
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6221cotter pin1/16" x 1/2"1
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Other Items:
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Carburetor (optional)Carb from O.S. max .12 CZ radio control car engine with bore of .166" and RPM range of 1,000 - 5,000.
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NGK CM-6 spark plug
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12 V car coil
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12 V car battery
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fuel tank and connecting line
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fuelcamping lantern fuel, methanol, gas/oil
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ignition points
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ignition condenser
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spark plug wire
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Tools needed:
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11.094 ream (3/32")
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8.125 ream (1/8")
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6,7.188 ream (3/16")
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3.250 ream
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7.281 ream (9/32")
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5,9.313 ream (5/16")
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8.375 ream (3/8")
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3.500 ream
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10,12#2-56 tap
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3,4,6,8,14#4-40 tap
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3,4#6-32 tap
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3,5#8-32
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4#10-32 tap
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4tap 10mm x 1mm for NGK CM6 spark plug
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10.375 (3/8") counterbore
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11#60 drillNeeded to drill hole in valve rod - easy to break, consider getting a spare
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