Andrews Home Page

 

Instruction Documents Information Sheets

Motorcycle & Automotive Parts Catalog

Motorcycle Parts Retail Prices

Tech Question

About Us
 

TWIN 88: GEAR DRIVE CAMSHAFTS
 
Andrews Twin 88 camshafts are available with S & S gear drives. Engines with gear driven cams show a 4 hp gain over cams with chains. If less power is needed to turn the camshafts, more power gets to the rear wheel. Also, gear drive cams do not have chain tensioner shoes to wear out. When deciding what cam to use in your 88 engine, the most important consideration is the proper match between compression ratio and intake
cam duration. For best street performance, the static compression pressure should be around 175-180 PSI. Drag motors can handle still higher static pressures. Lower static pressure of 160 PSI are great for all around riding.
 
TOURING AND PERFORMANCE CAMS
      Duration Valve Lift @            
Part# Grind 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 21G 10/30 220 255 0.498 0.134 Stock Bolt-in 88 cam: more torque for all around riding with
  40/08 228 264 0.498 0.121   heavy bikes, intended for stock compression ratio and
21G cams run great with fuel injectors or carburetors!   pistons. Similar to #23 cam in EV80. (1700-4800 RPM).
288126G 26G 11/35 226 262 0.490 0.138 Stock Bolt-in cam for 88-95 inches - stock compression ratio.
  41/09 230 266 0.490 0.120   Great for two up touring, this cam will add torque and HP
26G cams run great with fuel injectors or carburetors!   at lower and middle RPM ranges. (1800-5200).  
288131G 31G 10/46 236 272 0.510 0.131 Stock Great cam for motors with 95+ inches and 10:1 CR.
  52/08 240 276 0.510 0.120   Lower TDC lift means easy installation. Similar to 37G
    but different timing. 2000-5800 RPM power range.
288137G 37G 18/38 236 272 0.510 0.174 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 0.510 0.148  
37G cams run great with fuel injectors or carburetors!  
288144G 44G 21/41 242 279 0.495 0.182 Stock For 88 or 95 inches and 9.5 C.R. or higher. Max torque
  49/17 246 283 0.495 0.158   and HP at mid and upper RPM (2300-5800).
288150G 50G 20/48 248 283 0.510 0.184 Stock Designed for easy installation in 95 inch motors with
  54/18 252 287 0.510 0.168   stock heads and 9.5 to 9.8 C.R. (2400 to 6000 RPM).
288155G 55G 22/46 248 283 0.550 0.197 Hi-lift Great cam for 95 inch engines with 9.8 to 10.2 C.R.
  52/20 252 292 0.550 0.181   Max HP - torque at mid and upper RPMs (2600-6200).
288160G 60G 24/56 260 296 0.560 0.205 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 0.560 0.205  
The following three cam grinds are available for gear drive systems only!
288167G 67G 24/48 252 287 0.570 0.209 Hi-lift Performance cams for 95-107+ inches, 10.0 to10.8 C.R. with high flow head setup. (2600-6400+ RPM).
  58/22 260 297 0.570 0.187  
288159G 59G 29/57 266 303 0.590 0.238 Hi-lift Great cam for 95-107+ inchers with 10:2 C.R. or
  63/27 270 307 0.590 0.218   Max torque and HP (2700-6500+ RPM).
288164G 64G 30/62 272 307 0.640 0.262 Hi-lift Big cams for modified 95-116+ inch motors running
  66/30 276 312 0.640 0.232   10:2 CR or higher. Heads must be set for .700 lift
              and modified for max air flow. (3000-6500+ RPM).
(*) Timing and duration listed for .053 cam lift.                
 

Copyright © 2006, All rights reserved.
Andrews Products, Inc.
431 Kingston Ct.
Mount Prospect, IL
60056

847 - 759 - 0190 phone
847 - 759 - 0848 fax

Terms and Conditions
Feedback