Andrews Catalogue 2020

1936–’47

Knuckle Engine Camshafts

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 .089 .105 .130 .130 .156 .156

Springs Application

212965

N

13/41 44/16 27/55 55/27 35/63 63/35

234 240 262 262 278 278

270 276 308 308 318 318

.348 .348 .370 .370 .368 .368

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–’48)

Four new cam gears as shown: Andrews UL-80 cam gears are similar to original stock parts, but the lobes have been re- designed using modern computer cam design and smoothing techniques. Cams For UL-80 Big Twins (1937–’48) �������������������Part #214380

UL-80 Cam Bushing Inner Diameters

Cam #

Cover bushing ID

Case bushing ID

#1 #2 #3 #4

.7805 1.1235 .6860 .6860

.6860 .6860 .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

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