Cummins 5.9L Cams

Colt Cams is proud to introduce our latest grinds for the Cummins 5.9L B series engine! We've worked long and hard to develop these great new profiles. We've dyno'ed some 50 different combinations of durations, lobe separation and installed centerlines to come up with the ultimate cam for your Cummins 5.9. We have a large quantity of new cast billets in stock ready for you! Our 5.9L Cummins cams are available in 6 stages. We are always willing to customize alternative grinds as well.

 

 

 

 

Stage 1: DISCONTINUED The best grind for fuel economy and bottom end torque! - Straight drop in

  • No clearance issues or springs required
  • Lobe separation, higher lift and longer duration, improves air flow by approximately 30%
  • Reduces turbo lag, faster spool up
  • Greatly improved throttle response
  • Approximately 25% reduction in smoke
  • 100 – 150° EGT drop
  • 1 – 3 MPG increased fuel economy on average
  • RPM: Idle – 2700
  • Write-up in Diesel Power Magazine

Stage 2: This is very similar to stage 1 but with a longer duration and lift on the exhaust side for engines with a slight restriction—or if you just want a little more exhaust flow.

  • RPM: Idle – 3000

Stage 3: Nicknamed the "BIG STICK". It has gained the most popularity. This cam delivers the strongest mid-range torque and H.P possible, but still has good bottom end and drivability. No mods are required, but we do recommend a set of springs.
  • Average 2 – 3 MPG increase
  • 30 – 35 % smoke decrease
  • Approximately 200° EGT drop
  • Good to 4000 rpm

At the bottom of this page are the specs for the stock and performance grinds. The secret to the outstanding performance of these cams is their ramp velocity and acceleration.

Key in this position retards cam. 
Reference only.
Colt Cams are all ground to exact C/L’s
for best Results and piston clearance.

Click on images for a larger view 
       
 Note: Detail to 
fillet radius.
Optional retainer plate.
(All cams tapped to accept
this on new billets.)
Comparison of lobe
widths to Colt Cams.
 Comparison of semi
finished chill cast billet
and finished cam.

 
Cummins 5.9 and 4BT Cam Specs
   
Duration
Cam
Lift
Lobe
Sep
ROCKER RATIOS:
12V - 1.75/1 INT/EXH
24V - INT 1.5/1 EXH 1.4/1
Prof. I.D.#   @ .050 ADV.
  INT.
159°
 
0.235
102.0
Stock 2nd Generation 12V 1994-1998.5
  EXH.
204°
 
0.263
 
 
  INT.
159°
 
0.235
 
107.5
Stock 2nd Generation 24V 1998.5-2002
  EXH.
206°
 
0.297
 
 
  INT.
163°
 
0.237
98.5
Stock 24V C.R. 2003-2007
  EXH.
191°
 
0.299
 
 
Stage 1 INT.
175°
 
0.251
103.0
Hi Torque, bottom end fuel economy cam.
 C.332.S EXH.
206°
 
0.297
 
DISCONTINUED
Stage 2 INT.
175°
 
0.251
104.0
New torquer cam. Better exhaust flow and better fuel economy.
 C.341.S EXH.
210°
 
0.307
 
$325.00 USD (regrind price).
Stage 3 INT.
181°
 
0.280
106.0
"The Big Stick". Our most popular drop in cam. Best for all round' power.
 C.343.S EXH.
210°
 
0.307
 
$375.00 USD (regrind price), $599.00 USD new cast billet.
Stage 4 INT.
181°
 
0.280
107.5
Straight drop in, good to 4400 rpm.
C.346.S EXH.
218°
 
0.323
 
$649.00 USD, new cast billet.
Stage 5 INT.
199°
 
0.296
108
Valve clearance required, good to 5000 rpm.
C.349.S EXH.
218°
 
0.323
 
$699.00 USD, new cast billet.
Stage 6 INT.
228°
 
0.329
108.5
Valve clearance required. Full race / sled pull, good to 6000 rpm.
C.784.S EXH.
244°
 
0.338
 
$849.00 USD, new cast billet.

NOTE: ALL THESE GRINDS ARE RUN ON THE 4BT AS WELL. The cost is approximately
$60.00 USD less on re-grinds and new cast billets compared to the 6 cylinder.

NOW AVALIABLE: COLT CAM'S OWN LINE OF NEW TAPPETS, ONLY $160.00 USD A SET!


Valve lash all grinds: INT: .010" EXH .020" cold.

  • Follow Cummins installation instructions, use adequate amounts of assembly lube.
  • Retainer torque 44 ft lbs – use red loctite.
  • When using our retainer, clearance is required on C.R.
  • Always use new or re-crowned lifters! The cost for us to re-crown yours is $75.00 USD.
  • IMPORTANT NOTES:
    • C.R. cams cannot grind to stage 3, only to 1 and 2. You must use 24V 2nd core or new cast billet cams for anything over stage 2 grinds.
    • When using our new Big Stick Cast Billets, use 2nd gen. 24V lifters only. (From 1998.5 – 2002, use Cummins Part #3942565.)
    • If using C.R. lifters with larger head, (also heavier) make sure it clears the fuel pump lobe on # 5cyl., especially on the 12V engines. C.R. blocks are ok but you should still check. If your gear is not pressed on all the way, the lifters could touch.

CAUTION! IF USING AFTER MARKET CONNECTING RODS,
EXTRA CLEARANCE MAY BE REQUIRED ON CAM CORE!


When sending us your camshaft(s), 
please remove the gear(s) before shipping, and
we highly recommend not to ship your camshaft in tubes!
 

BREAK IN PROCEDURE
  • Cam Lube on all lobes, lifter faces and oil pump gears.
  • Oil all bearing journals and lifter barrels.
  • Always turn engine over by hand before starting, check for clearances and proper timing location. 
  • Fire up to 1800 – 2000 rpm. for 18 – 20 minutes. 

Note: Most oil companies have taken out a percentage of additives that are meant for anti-scuffing for break in on flat tappet cams, so please ask your local auto parts professional for the best zinc additive they have and add it to your oil before you fire up your engine for the first time. (We prefer ZDD Plus.)