separate on-site, clean, indoor storage for at least 10 customer vehicles. As well as a huge range of used, new, remanufactured and reconditioned Lotus parts – it must be the largest 900 series Lotus parts stockist in the world – Mike also indulges himself with some serious research and development work, including regular use of his on-site Schenck dynamometer, and has numerous contacts capable of engineering specialist engine parts to his exact requirements. A recent project has been the design and production of a Lotus cylinder head, machined from solid, with greatly impro�ed flow capabilities achie�ed b� a better combustion chamber as well as port design and angle which produces significantl� impro�ed tor�ue and power throughout the rev range, even compared to con�entionall� modified standard heads which are also available. As well as the Lotus applications this also suits the Vauxhall block, so increasing its desirability even further. After experiencing problems and delays with sourcing bespoke crankshafts from several prominent specialists, Mike made contact with Five-Pen Engineering, only a mile away in Long Itchington. This traditional specialist engineering company has since been employed to machine counterweighted crankshafts and fl�wheels �rom billet, as well as man� other useful components made to order. The long-stroke crank conversion is a Lotusbits speciality, inherent in the 2.5-litre engine upgrade that has been proven in their rally cars. Lotusbits also offers a set of 2.0-litre pistons or 2.2 ultralight pistons. Both sets come with lightweight conrods with smaller pins and longer rod length, which improves conrod angularity to allow the engine to rev higher, up to 9000 rpm. The weight saving is quite considerable, with the lightweight piston and rod assembly tipping the scales at just 1.07 kg, compared to 1.75 kg for the standard components. ** ** ** ** ** ** ** ** *** RTA43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43X84 84 84 84 84 84 84 84 84 84 84 84 *** no no no no no no no no no no no no no no now with ge ge ge ge ge ge ge ge ge ge ge ge ge ge ge ge ge ge ge ge gen 2 billet he he he he he he he he head flowing ng ng ng ng ng ng ng ng ng ng ng ng ng ng ng ng ng ng ng ng 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 208 cfm-3 deg on on on on on on on on on on on on on on on on on on on on on ignition EngP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gP gPwr EngTrq 50 10 10 100 15 15 15 15 15 150 20 20 200 25 25 250 30 30 300 25 25 2500 30 30 3000 35 35 35 35 35 3500 40 40 40 40 40 4000 45 45 45 45 45 4500 50 50 50 50 50 5000 55 55 55 55 55 5500 60 60 60 60 60 6000 65 65 65 65 65 6500 70 70 70 70 70 7000 75 75 75 75 75 7500 80 80 80 80 80 8000 85 85 85 85 85 85 85 85 85 85 85 8500 STP Correc ec ec ec ec ected Fly whee ee eel Power vs vs vs. RPM RTA TA TA TA TA TA T 43 43 43X 43X 43 43 43X 43X 43X 43 43 43X 43 84 84 84 X84 X84 X84 X84 X84 X, RTA TA TA TA TA TA T 43X 3X 3X 3X 3X 3X 3 6 X6 X6 X6 X6 X6 X 5, 15:40:00 V n™ yn yn yn yn yn nDyn in in in in in ow Win lo lo lo lo lo Flo rF rF rF rF rF perF up up up up up Sup 20 / 2 / 2 / 2 / 2 / 2 03 / 11 / 2 EngS gS gS gS gS gSpd RPM RTA43X 3X 3X84 RTA43X 3X 3X65 LEFT & ABOVE: �s tested on the in-house Schenc� dyno� the �otusbits machined �rom solid cylinder head signi�cantly improves torque and power throughout the rev range. BELOW: Machined from solid cylinder head greatly improves flow capability� even when compared to conventionally modi�ed standard heads. BELOW: Conveniently local, Five-Pen Engineering has been engaged to machine counterweighted longstro�e cran�sha�ts and flywheels �rom billet.... P