2 replies to this topic

[Jordie]

By AC Dodd

http://p211.ezboard....opicID=51.topic

Aftermarket Cams

First off is the excellent Swiftune SW5 road cam, these figures are based on my observations based on 2 new examples I measured about 2 years ago. The figures are to be read as average of the 2,

Checking height: 0.016" @ lobe

Timing: (Intake): 16/48 (Exhaust): 52/12

Nominal lobe lift: (Intake): 0.281" (Exhaust): 0.281"

Duration (Intake): 244 (Exhaust): 244

Lobe centre angle (Intake): 106 (Exhaust): 110

Lobe separation angle: 108

Lift on overlap: 0.036"

Accuracy: Good


The next in the Swiftune family is the SW10, which is basically a real hot road cam like a 286 but with better emissions and suited to road use where wear characteristics are more important than outright performance.

b]Checking height:[/b] 0.016" @ lobe

Timing: (Intake): 34/66 (Exhaust): 70/30

Nominal lobe lift: (Intake): 0.291" (Exhaust): 0.291"

Duration (Intake): 280 (Exhaust): 280

Lobe centre angle (Intake): 106 (Exhaust): 110

Lobe separation angle: 108

Lift on overlap: 0.070"

Accuracy: Good


Next is the much under used Kent 246 a nice all round road cam that has a little more bite than the SW5, these figures are based on kents own specs, plus with my own additions looking at 1 cam.

Checking height: 0.016" @ lobe

Timing: (Intake): 18/54 (Exhaust): 54/18

Nominal lobe lift: (Intake): 0.285" (Exhaust): 0.285"

Duration (Intake): 252 (Exhaust): 252

Lobe centre angle (Intake): 108 (Exhaust): 108

Lobe separation angle: 108

Lift on overlap: 0.048"

Accuracy: Good



Next is the Kent 266 a nice all round road cam, these figures are based on kents own specs, plus with my own additions.

Checking height: 0.016" @ lobe

Timing: (Intake): 24/56 (Exhaust): 61/29

Nominal lobe lift: (Intake): 0.263" (Exhaust): 0.268"

Duration (Intake): 260 (Exhaust): 270

Lobe centre angle (Intake): 106 (Exhaust): 106

Lobe separation angle: 106

Lift on overlap: 0.054"

Accuracy: Average



Here is the Kent 276;

Checking height: 0.016" @ lobe

Timing: (Intake): 29/61 (Exhaust): 66/34

Nominal lobe lift: (Intake): 0.293" (Exhaust): 0.315"

Duration (Intake): 270 (Exhaust): 280

Lobe centre angle (Intake): 106 (Exhaust): 106

Lobe separation angle: 106

Lift on overlap: 0.078"

Accuracy: Below Average



Here is the 286;

Checking height: 0.016" @ lobe

Timing: (Intake): 34/66 (Exhaust): 71/39

Nominal lobe lift: (Intake): 0.315" (Exhaust): 0.324"

Duration (Intake): 280 (Exhaust): 290

Lobe centre angle (Intake): 106 (Exhaust): 106

Lobe separation angle: 106

Lift on overlap: 0.088"

Accuracy: Below Average


The Kent 296;

Checking height: 0.016" @ lobe

Timing: (Intake): 39/71 (Exhaust): 76/44

Nominal lobe lift: (Intake): 0.324" (Exhaust): 0.340"

Duration (Intake): 290 (Exhaust): 300

Lobe centre angle (Intake): 106 (Exhaust): 106

Lobe separation angle: 106

Lift on overlap: 0.112"

Accuracy: Average



Kents Version of the good old 649;

Checking height: 0.016" @ lobe

Timing: (Intake): 43/64 (Exhaust): 61/40

Nominal lobe lift: (Intake): 0.323" (Exhaust): 0.323"

Duration (Intake): 287 (Exhaust): 281

Lobe centre angle (Intake): 100.5 (Exhaust): 100.5

Lobe separation angle: 100.5

Lift on overlap: 0.110"

Accuracy: Average



Piper's BP300. These figures are based soley on the average of 3 cylinders checked in my jig.


Checking height: 0.016" @ lobe

Timing: (Intake): 47/75 (Exhaust): 75/47

Nominal lobe lift: (Intake): 0.315" (Exhaust): 0.315"

Duration (Intake): 302 (Exhaust): 302

Lobe centre angle (Intake): 104 (Exhaust): 104

Lobe separation angle: 104

Lift on overlap: 0.125"

Accuracy: Good



The Morspeed phase 2 (Fast road) Based on 1 example only;

Checking height: 0.016" @ lobe

Timing: (Intake): 20/52 (Exhaust): 56/16

Nominal lobe lift: (Intake): 0.305" (Exhaust): 0.298"

Duration (Intake): 252 (Exhaust): 252

Lobe centre angle (Intake): 106 (Exhaust): 110

Lobe separation angle: 108

Lift on overlap: 0.048"

Accuracy: Good


The Morspeed phase 3 (trackday cam) Based on 1 example only;

Checking height: 0.016" @ lobe

Timing: (Intake): 27/63 (Exhaust): 63/27

Nominal lobe lift: (Intake): 0.315" (Exhaust): 0.311"

Duration (Intake): 270 (Exhaust): 270

Lobe centre angle (Intake): 108 (Exhaust): 108

Lobe separation angle: 108

Lift on overlap: 0.065"

Accuracy: Good



Keith Calvers (not his own I know) , RE13 Based on 1 example only;

Checking height: 0.016" @ lobe

Timing: (Intake): 34.5/61.5 (Exhaust): 63.5/32.5

Nominal lobe lift: (Intake): 0.290" (Exhaust): 0.290"

Duration (Intake): 276 (Exhaust): 276

Lobe centre angle (Intake): 103.5 (Exhaust): 105.5

Lobe separation angle: 104.5

Lift on overlap: 0.085"

Accuracy: Good



Ok, a little differnt this time, but a very good cam company none the less, this is a B646 from NEWMAN cams Based on 1 example only;

Checking height: 0.016" @ lobe

Timing: (Intake): 14/58 (Exhaust): 51/21

Nominal lobe lift: (Intake): 0.302" (Exhaust): 0.298"

Duration (Intake): 252 (Exhaust): 252

Lobe centre angle (Intake): 112 (Exhaust): 105

Lobe separation angle: 108.5

Lift on overlap: 0.047"

Accuracy: Good

[ministox man]

The Kent 246 is also a high torque cam designed for the ORC Ministox that I race so i think it would be a good hillclimb cam being a high torque camshaft

My power + torque figures illustrate how torquey this cam is (bare in mind i have to run a restrictor plate between the carb and manifold that has an 18mm hole in it)
36.1 bhp and 50.4 lb/s of torque

It also gives good power as my car is the most powerful at the track i race at (not boasting or anything)

[mike.]

Thought i'd add this great cam info list - So it doesn't get lost again

http://www.edhodson....o/Mini Cams.xls