TWIN CAM FORUMS
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Twin Cam 88; 88B¤ Twin Cam 96; 96¤ Introduced 1999 on Dyna and Touring models; 2000 on Softails¤. 2007 on all models. Displacement 1450 cc (88 cu in) 1573 cc (96 cu in) Oil pump
Internal, connected directly to drive shaft; more efficient, maintains higher pressure and larger volume. Internal, connected directly to drive shaft; more efficient, maintains higher pressure and larger volume. Cams One per cylinder, each with 2 lobes; allows better push rod alignment with rocker arms. One per cylinder, each with 2 lobes; allows better push rod alignment with rocker arms. Cam Drive Silent chain with spring-loaded tensioners*; many riders have installed aftermarket gear driven cams to increase timing accuracy and eliminate cam shoe tensioners. Silent chain with hydraulic tensioners*; fewer riders have installed aftermarket gear driven cams to increase timing accuracy and prevent cam shoe tensioner failure. Bore & Stroke Bore: 3.75 inch
Stroke: 4.00 inchBore: 3.75 inch
Stroke: 4.38 inchCompression Ratio 9.0:1 9.2:1 Transmission 5-speed transmission casing is attached directly to the engine for Dyna & Touring models; not mated on Softail models. 6-speed transmission casing (6th gear reduces engine rpm by 11% @ highway speeds) attached directly to engine for Dyna & Touring models; not mated on Softail models. Quieter helical cut gears in ratios designed to better match the engines torque curve. Oil Tank Below & behind the transmission assembly for Dyna & Touring models; above & behind for Softail models. Below & behind the transmission assembly for Dyna & Touring models; above & behind for Softail models. Fuel Delivery Carb early, then EFI exclusively on later models. EFI Only. Combustion Chamber Commonly referred to as "bathtub" shape, 85cc size provides more efficient combustion and higher compression. Commonly referred to as "bathtub" shape, provides more efficient combustion and higher compression. Sparkfire Dual coils w/12mm sparkplugs. Dual coils w/12mm sparkplugs. Engine Cooling STILL air-cooled. 50% more fin area and an oil jet spraying the bottom of the pistons gives additional cooling capability. STILL air-cooled. Increased cooling fin area and an oil jet spraying the bottom of the pistons gives additional cooling capability. ¤ Twin Cam "B" designed specifically for Softails as engines are mounted directly to frame. Design elements include a block change to accommodate counter balancers.
* Hydraulic tensioners introduced on Dyna line in 2006 and released to all others in 2007.
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