General
A Overhead Camshaft engine is an internal combustion engine with the camshaft placed in the cylinder head.
The NSU Ultramax camshaft drive operates with 2 push rods, which rotate on eccentric disks.
Details you can find here:
https://www.printables.com/model/272096-nsu-ultramax-camshaft-drive
This model has a total engine capacity of 60 cc.
Choise between an open and closed design of the cylinder head.
Dimensions: 185 x 103 x 173 mm.
Weight: 0.36 kg.
Printing and Assembly
I printed the model on a PRUSA Mini, with PLA+ filament, layer height 0.2 mm.
The parts should be printed on a smooth build plate, not textured.
If possible, avoid elephant foot.
I use Hard Plastic Glue where necessary.
For 3D views, use .stl files 00… 01... 02… 03… 04… 05… .
Printing and assembly in alphabetical order, A1 → J1.
Instructions for printing and assembly is available for many .stl files.
Post-processing
As always with mechanical models, be sure all moving parts run smoothly.
I use files, sandpaper and sharp hobby knifes. A few drops of motor oil may help too.
Pay special attention to seams on bearings and axles.
Maybe you need a 5 mm drill to widen the four valve guides in the cylinder head.
Metal parts
Eight M4 x 25 mm allen bolts are needed to join the cylinder heads to the cylinders.
Eight coil springs are needed as valve springs, 10 mm width x 15 mm height. Wire thickness 0.6 or 0.7 mm (AliExpress).
Valve timing
Initial valve timing can be executed when glueing "G1 - Base Plate Ultramax" to the cylinder.
Updates
19-9-2022 : Cam lift reduced from 3.5 mm to 2 mm. For a smoother run, especially when using strong valve springs.
OHC V60 Ultramax Engine
by Bootjevaarder · original on Printables ↗
Hobby & Makers / Automotive
♥ 1.2k⬇ 1.4k🖨 8 prints
Print profiles
A2 - Crank Pin.stl
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B3 - Dowels Crankcase.stl
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A4 - Crank Cheek.stl
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A3 - Piston Rods.stl
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A1 - Crank Cheek.stl
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C2 - Wrist Pins.stl
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C1 - Pistons.stl
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D1 - Cylinders.stl
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E2 - Spark Plug.stl
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05 - 3D VIEW Crankshaft Pistons.stl
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D2 - Dowels Crankcase-Cylinders.stl
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01 - 3D VIEW NSU Ultramax Cam Drive.stl
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04 - 3D VIEW Crankcase Cylinders.stl
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B1 - Crankcase 1.stl
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B2 - Crankcase 2.stl
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B4 - Crankshaft Bearings.stl
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B5 - Crankshaft Gears.stl
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03 - Ultramax Eccentric Disks Alignment.stl
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I2 - Power Tool Adapter.stl
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F5 - Valve Caps.stl
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F6 - Rocker Axles.stl
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F4 - Rockers.stl
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G1 - Base Plate Ultramax.stl
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G3 - Bearing Base Plate.stl
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G4 G7 - Eccentric Disks.stl
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G8 - Driven Gear.stl
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G9 - Axle Camshaft.stl
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G10 & G11 - Eccentric Disks.stl
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G12 - Bearing Base Plate.stl
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G13 - End stop Axle Camshaft.stl
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H1 - Exhausts.stl
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00 - 3D VIEW Cylinder Head.stlDEFAULT
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H2 - Throttle Bodies.stl
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I3- Crankshaft End Stop.stl
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02 - EXPLODED VIEW NSU Ultramax Camshaft Drive.stl
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G5 & G6 -Push Rods.stl
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J1 - Stand.stl
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I1 - Cranked Handle.stl
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G2 - Axle Driven Gear.stl
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F7 - Valves.stl
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F2.1 Cams- Cylinder 1.stl
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F2.2 Cams - Cylinder 2.stl
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E1.2 - Cylinder Head - Closed.stl
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E1.1 - Cylinder Head - Open.stl
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F3 - Camshaft Spacer.stl
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F1 - Camshaft Axle.stl
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