Variable Length Intake Manifold

myminifactory

Supporting Free Design Competition Product Design VARIABLE MANIFOLD Description Entry Category: Product Design Inspired by my University dissertation (separate file) for improving the efficiency of older carburettor fuelled vehicles, specifically a Triumph Spitfire 1500, by converting it to electronic fuel injection with a variable length intake manifold. The design has been revised to comply with support-free constraints. It can be adapted to various applications dependent on requirements and size constraints, with calculations included in the attached dissertation to design your own version based on your own vehicle. Purchased Parts List: • 2 x 75mm ID bearings to seal rotary and static components (e.g. from: http://simplybearings.co.uk/shop/p170303/6215ZZ+Budget+Metal+Shielded+Deep+Groove+Ball+Bearing+75x130x25mm/product_info.html) • 1 x 42mm ID bearing to allow the manifold to rotate while keeping the throttle body in position (e.g. from: http://simplybearings.co.uk/shop/p150426/F16048+Rubber+Sealed+Double+Row+Wheel+Bearing+42x82x36mm/product_info.html) • 4 x M2x10mm Socket head screw caps and washers to mount the stepper motor. • Stepper Motor; using RPM output signal (processed through something like a Raspberry Pi) to determine the manifold position, ensuring the right length for given RPM to maximize efficiency. (e.g. from: http://uk.rs-online.com/web/p/stepper-motors/5350338/) All printed parts are assembled together and glued where necessary (i.e. Static Tube to Static Piece, all Variable Components together). Gear is attached to motor through the motor mount piece and meshed with the end piece of the variable section. A bit of calibration would be needed but should only need to be done once if the program returns to start position when the engine is switched off. The parts are printed using either Acetal, Polyethylene or Polypropylene materials to resist ethanol content within modern fuels.