Andrews Products Catalogue
Knuckle Engine Camshafts
1936–1947
As amazing as it sounds, there are lots of Knuckle engines still going strong. Knuckles have been around for almost 80 years! How many other motorcycles can make this kind of a claim for long life and durability?
Old Knuckles Run Forever!
Duration Valve Lift @
Part# Grind Timing(*)
.053 .020 Lift
TDC Springs Application
212965
N
13/41 44/16 27/55 55/27 35/63 63/35
234 270 240 276 262 308 262 308 278 318 278 318
.348 .348 .370 .370 .368 .368
.089 .105 .130 .130 .156 .156
Stock
Stock Knuckle replacement cam. For stock motors and restoring an older classic engine, this is the cam to use. Bolt-in Knuckle performance cam for stock motors, smooth idle, strong pull to 6000 RPM. Knuckle equivalent of “B” cam. Knuckle performance cam for stroked motors; strong pull to 6000 RPM. This is the Knuckle equivalent of a “C” cam.
212970
S
Stock
212980
K
Stock
Knuckle cam bearings are ground to .8115 to fit stock bushings. * Timing listed at .053 cam lift.
New Cams For UL-80 Big Twins (1937–1948)
Four new cam gears as shown: Andrews UL-80 cam gears are similar to original stock parts, but the lobes have been rede- signed using modern computer cam design and smoothing techniques. � � � � � � � � � � � � � � � � � � � � Part# 214380
UL-80 Cam Bushing Inner Diameters
Cam #
Cover bushing ID
Case bushing ID
#1 #2 #3 #4
�7805
�6860 �6860 �6860 �6860
1�1235
�6860 �6860
Valve lift = .375 inches; rocker ratio = 1 to 1 Duration = 212 degrees @ .053 tappet lift
Timing checking fixture for UL-80 cams
Cam inspection– Adcole 911 gage
13
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