TWIN 88: GEAR DRIVE CAMSHAFTS     (See Bottom of Page for Chain Drive Camshafts

Andrews Twin 88 camshafts are available with S & S gear drives. Engines with gear driven cams show gains of 4 hp over cams with chains. If less power is needed to run the camshafts, more power gets to the rear wheel. For all out drag motors, there is another advantage: With gear drive cams, very high lift cams can be used without interference between front and rear cam lobes. With the gear drive cams, lobe angles are different so lobe interference cannot occur. The gear drives are so smooth that ball bearings are used on both camshafts instead of a rear roller bearing. Also, gear drive cams do not have chain tensioner shoes to wear out.
 
TOURING AND PERFORMANCE CAMS
 

TEC  #

Grind   Duration   Valve Lift @              
Part# Timing(*) 0.053 0.020 Lift TDC   Springs Application  
Stock cam data for both carbureted engines and injected engines is listed on the TWIN 88: Chain Drive Cams and Kits page.
288121G 84081 21G 10/30 220 255 0.498 0.134 Stock Springs
            Bolt in cam first introduced in 2000,
  40/08 228 264 0.498 0.121 more torque for all around riding with
   ratio  stock comp. heavy bikes.
21G cams run great with fuel injectors or carburetors! Similar to #23 cam for EV80. (1700-5200 RPM).
288126G 84082 26G 11/35 226 262 0.490 0.129 Stock Springs
Bolt-in cam for lower RPM torque,
FLT, etc. For two up touring,
            this cam will add Torque and HP
  41/09 230 266 0.490 0.112  at lower and middle speed ranges.
26G cams run great with fuel injectors or carburetors! (1800-5500 RPM)
288137G 84083 37G 18/38 236 272 0.510 0.174 Stock Springs
Twin 88s with this cam grind show
  46/14 240 276 0.510 0.148 80+ rear wheel HP. Smooth idle, broad
torque band. Same grind as TW37b
37G cams run great with fuel injectors or carburetors! but w/gear drive. (2200-5800 RPM).
288144G 84084 44G 21/41 242 279 0.495 0.182
Stock Springs
For 88 or 95 inches and 9.25 C.R.
  49/17 246 283 0.495 0.158 or higher. Maxtorque and HP at mid and
upper RPM (2400-6000+)
288150G 84086 50G 20/48 248 283 0.510 0.184 Stock Springs Designed in '99
for easy installation  n 95 inch motors
  54/18 252 287 0.510 0.168 with 9.25 C.R. and stock heads.
(2500 to 6000 RPM).
288155G 84085 55G 22/46 248 283 0.550 0.197 Hi-lift Springs Great cam for 95 inch engines 
with 9.5 C.R. Max HP
  52/20 252 292 0.550 0.181 and torque at mid and
 upper RPM (2600-6300 RPM).
288167G 84087 67G 24/48 252 287 0.570 0.209 Hi-lift Springs New on '03. Performance cam;
95-103 inches. 10.25 C.R. and
heads set
  58/22 260 297 0.570 0.187  up for high flow (2800-6500+ RPM)
288160G 84090 60G 24/56 260 296 0.560 0.205 Hi-lift Springs
For a well prepped 95-103 in, 100 HP+
  58/22 260 296 0.560 0.205 is within reach. Max torque and
HP range is (2700-6500+ RPM)
288159G 84089 59G 29/57 266 303 0.590 0.238 Hi-lift Springs
Great cam for gear drive
 95+ inchers with
10:1 C.R. or higher. Max torque
  63/27 270 307 0.590 0.218  and HP (2400-6500+ RPM).
288164G 84091 64G 30/62 272 307 0.640 0.262 Hi-lift Springs

High lift cams for modified 95-116 inch motors

running 10:1 CR or higher. Heads must be
  66/30 276 312 0.640 0.232 set for .700 lift and modified for max air flow.
 (3000-6500+ RPM).
 
Outer Gears & Cam Gears Gear Drive Installation Kit

 

Complete kit of all four cam drive gears with installation bolts. Crank and Cam Drive Gears   Gasket and bearings shown are necessary to complete the installation of gear drive camshafts.
TEC # Gear Drive Installation Kit Andrews
TEC # Crank and Cam Drive Gears Andrews
84094 288908 84096 288901
 

Outer Drive Gears

 

This kit includes the crankshaft and cam drive gears for a gear drive installation. Both bolts for the gears are also included.
TEC # Description Andrews
84095 Outer Drive Gears 288903
 
TWIN 88 PUSHRODS, SPRINGS and COLLARS

 

Twin 88 pushrods are available with EZ-install ends or standard adjustable tips. Both types are made in anodized aluminum or chrome moly steel. EZ-install pushrods can be installed without removing gas tanks or rocker boxes. If you are installing bolt-in cams, this is a big plus!   Spring Kit includes (4 inner and 4 outer springs)For valve lifts up to .560. Installation does not require head machining. High lift springs and collars makes installing big cams a lot easier.
TEC # Description Andrews
84283 High Lift Spring Kit  294150
TEC # Description Andrews Titanium upper spring collars Designed to fit all Twin 88 engines. Provides .050" more spring travel than stock collars. Collars are stronger and 50% lighter than stock collars.
84032 Standard Aluminum 292388
84032 Standard Chrome moly 292288
84030 EZ-install Aluminum 292188 84288 Titanium upper spring collars 293110
84031 EZ-install Chrome moly 292088
 
TWIN 88 CAM DRIVE SPROCKET KITS
Andrews heat treated steel cam drive sprockets fit all 2000 and later rear camshafts (with involute splines). Kit includes three spacer shims and one grade 8 bolt and hardened washer. New sprockets can be set up to the same length specs as original stock sprockets. If you're into performance riding with a Twin 88 engine, steel sprockets are a must even with stock camshafts
 
 Shown above from left to right:
TEC # Description Andrews
84002 34 tooth splined cam sprocket kit: 288015
84001 17 tooth steel crank sprocket:  288020
84000 34 tooth steel keyed cam sprocket kit (with square key drive; '99 style):  288010
 
 
TWIN 88: CHAIN DRIVE CAMSHAFTS  
Want more power from your new 88 engine? Andrews Products has seven proven Twin 88 grinds for 2004 to get you there. More HP and torque for stock or modified engines is within easy reach. All cam grinds listed are designed for use with stock H/D hydraulic lifters.For any bolt in cam grind, EZ-install pushrods do not require removal of gas tanks or rocker boxes for installation.

TEC #

Grind            Duration Valve Lift @  
Part# Timing(*) 0.053 0.020 Lift TDC Springs
288121 84008 TW21 10/30 220 255 0.498 0.134 Stock
  40/08 228 264 0.498 0.121  

TW21 cams run great with fuel injectors or carburetors!

 
288126 84010 TW26a 11/35 226 262 0.490 0.129 Stock
  41/09 230 266 0.490 0.112  

TW26 cams run great with fuel injectors or carburetors!

 
288137 84015 TW37b 18/38 236 272 0.510 0.174 Stock
  46/14 240 276 0.510 0.148  

TW37 cams run great with fuel injectors or carburetors!

 
288131 84012 TW31s 10/46 236 272 0.510 0.131 Stock
  52/08 240 276 0.510 0.120  
             
288144 84018 TW44 21/41 242 279 0.495 0.182 Stock
  49/17 246 283 0.495 0.158  
             
288150 84020 TW50 20/48 248 283 0.510 0.184 Stock
  54/18 252 287 0.510 0.168  
288155 84023 TW55 22/46 248 283 0.550 0.197 Hi-lift
  52/20 252 292 0.550 0.181  
             
288160 84025 TW60a 24/56 260 296 0.560 0.205 Hi-lift
  58/22 260 296 0.560 0.205