Twin 88: Gear Drive Camshafts (1999-2006 except '06 Dyna)

Andrews "G" series cams are designed for S & S gears for all Twin 88 engines from '99 through 2006 (except 2006 DynaGlides). Tests show a 4 HP gain over chain drive engines. With less power needed to run camshafts, more power gets to the rear wheel. Gear drive cams do not have chain tensioner shoes to wear out. When deciding what cam is best for your engine the most important consideration is a proper match of compression ratio and intake cam duration. For best street performance, static compression ratio should be around 175-180 PSI. Drag motors can handle still higher static pressures. Static pressures of 160 PSI are great for all-around riding. An explanation of static compression pressure appears in our catalog.

Stock cam data for both carbureted engines and injected engines is listed on the 88 Chain Drive Cams page.

Part #

 Grind

Timing(*)

Duration

Valve
Lift

Lift @
TDC

 Springs Application
.053 .020
288112G 12G 02/34 216 256 .474 .088 Stock Bolt-in cam with similar specs to stock '06 Dyna cams. Slight power increase - no retuning necessary.
37/05 220 259 .474 .110
288121G 21G 10/30 220 255 .498 .134 Stock Bolt-in 88 cam: more torque for all-around riding with heavy bikes; intended for stock compression ratios and pistons. Similar to #23 cam in EV80. (1700-4800 RPM).
40/08 228 264 .498 .121

21G cams run great with fuel injectors or carburetors!
288126G 26G 11/35 226 262 .490 .138 Stock Bolt-in cam for 88-95 inches - stock compression ratio. Great for two-up touring, this cam will add torque and HP at lower and middle RPM ranges. (1800-5200 RPM).
41/09 230 266 .490 .120

26G cams run great with fuel injectors or carburetors!
288131G 31G 10/46 236 272 .510 .131 Stock Great cam for motors with 95+ inches and 10:1 CR. Lower TDC lift means easy installation. Similar to 37G but different timing. 2000-5800 RPM power range.
52/08 240 276 .510 .120
288132G 32G 10/46 236 272 .570 .131 Hi-lift Hi-lift version of 31G. Much more power thru RPM range with 10:1+ CR. (2800-5800 RPM).
52/08 240 276 .570 .120
288137G 37G 18/38 236 272 .510 .174 Stock Hot street cams for 88 or 95 inches. 80+ rear wheel HP possible with well-tuned 88 motor; more with 95. Smooth idle, broad torque (2200-5600 RPM). Stock to 9.5 CR.
46/14 240 276 .510 .148

37G cams run great with fuel injectors or carburetors!
288144G 44G 21/41 242 279 .495 .182 Stock For 88 or 95 inches and 9.5:1 CR or higher. Max torque and HP at mid and upper RPM (2300-5800).
49/17 246 283 .495 .158
288150G 50G 20/48 248 283 .510 .184 Stock Designed for easy installation in 95 inch motors with stock heads and 9.5 to 9.8 CR. (2400-6000 RPM).
54/18 252 287 .510 .168
288155G 55G 22/46 248 283 .550 .197 Hi-lift Great cam for 95 inch engines with 9.8 to 10.2 CR. Max HP and torque at mid and upper RPMs (2600-6200).
52/20 252 292 .550 .181
288160G 60G 24/56 260 296 .560 .205 Hi-lift For well-prepped 95-103 inchers with 10.0 to 10.5 CR, 100+ HP is within reach. (2700-6500+ RPM).
58/22 260 296 .560 .205
The following three cam grinds are available for gear drive systems only!
288167G 67G 24/48 252 287 .570 .209 Hi-lift Performance cams for 95-107+ inches, 10.0 to 10.8 CR with high flow head setup. (2600-6400+ RPM).
58/22 260 297 .570 .187
288159G 59G 29/57 266 303 .590 .238 Hi-lift Great cam for 95-107+ inchers with 10.2 CR or higher. Max torque and HP (2700-6500+ RPM).
63/27 270 307 .590 .218
288164G 64G 30/62 272 307 .640 .262 Hi-lift Big cams for modified 95-116+ inch motors running 10.2 CR or higher. Heads must be set for .700 lift and modified for maximum air flow. (3000-6500+ RPM).
66/30 276 312 .640 .232
(*) Timing and duration listed for .053 cam lift.

ANDREWS PRODUCTS, INC.
431 Kingston Ct., Mt. Prospect, IL 60056
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