Inline 4 Cylinder Engine for 1:6 scale Honda Civic model Based on Inline 4 Engine design by Alex Zorko (www.nicjasno.com) Files: Engine.mpd - All inclusive MLCAD file, does not require additional .ldr files. Engine.ldr - Complete engine, requires Engine_Block.ldr and Head.ldr Engine_Block.ldr - Engine block Head.ldr - Cylinder Head Notes: The Ldraw files do not include the tubing, chain, or certain modified parts. The tubing is identical to Alex's inline 4, the chain however is only 33 links in length. The modified axle pins are still required to secure the camshaft guides, the connecting rods should still be cut down to 1x4 instead of 1x5, the valves still require being cut down, and the 16z clutch gear is still glued to the bushing. The odd shape of the transmission side is to connect to the transmission in my model, and does not need to be maintained. Major Changes from Alex's design: The original change was to reduce the height of the engine which was prohibitive when placed upright in the model. I attempted with little success to mount the engine at an angle, but decided against it. The height was reduced by eliminating the topmost anchors. Their removal was supplemented by the cam pieces that are attached between the valves and cylinders. This change saved 2 studs clearance, and (to my knowledge) does not affect the operation of the engine. The next change that was required was to mount the engine with the head facing in the opposite direction, but maintain the direction of rotation. This was facilitated by moving the chain to opposite side of the engine, and modifying the camshafts to fit the new effective rotation and orientation. Rotating the crankshaft the opposite direction to maintain the overall rotational direction required driving the lower camshaft instead of the upper one, resulting in a shorter chain which also has less extra slack. With the chain next to the camshaft gears, I was able to place 3 and 10 length axles back to back, meeting in the 16z gear, to achieve the driving camshaft, also the driven camshaft is driven almost directly from the chain instead of through an entire camshaft resulting in slightly improved timing.