COMP461
Comp Diesel Sponsor
Just so you all know the specs on this cam , because I'm sure it on its way to my competitors by now.
240 221 116 .400 intake lobe .380 exhaust lobe
These cams are very aggressive.
Installed in at 120 as a starting point the intake closes at 60 degrees after bottom dead center.
I don't design cams by these numbers but rather by each timing point.
I open the exhaust in a good place to affect blow down, and thump the charger. With a 2.6 it should not need much thumping if you run the correct exhaust housing.
I shut the exhaust at around TDC , I open the intake around TDC or just a little after , this cam has -3 negative overlap
Now to the part that really counts. When to close the intake valve
It’s hard work and requires a lot of thought and dyno time to fugure out where to close the intake to move the most amount of air before the piston come up and the chamber goes from negative pressure to positive pressure
If I advance 10 degrees to the end of the event and change nothing else, then the LSA ( lobe separation angle) changes by a quarter of this , and ILC ( intake lobe centerline) changes by half of this .
All the other number stays the same
One other factor, is that the number we are talking about are number at .050 my cams are very aggressive and the .200 lift number are a lot bigger than others lobes of similar number.
Same on my street grinds. My base street intake lobe is 184 2 .050. Others advertise bigger, but in reality they are just bigger at .050, not .200 where air flow is really moving
240 221 116 .400 intake lobe .380 exhaust lobe
These cams are very aggressive.
Installed in at 120 as a starting point the intake closes at 60 degrees after bottom dead center.
I don't design cams by these numbers but rather by each timing point.
I open the exhaust in a good place to affect blow down, and thump the charger. With a 2.6 it should not need much thumping if you run the correct exhaust housing.
I shut the exhaust at around TDC , I open the intake around TDC or just a little after , this cam has -3 negative overlap
Now to the part that really counts. When to close the intake valve
It’s hard work and requires a lot of thought and dyno time to fugure out where to close the intake to move the most amount of air before the piston come up and the chamber goes from negative pressure to positive pressure
If I advance 10 degrees to the end of the event and change nothing else, then the LSA ( lobe separation angle) changes by a quarter of this , and ILC ( intake lobe centerline) changes by half of this .
All the other number stays the same
One other factor, is that the number we are talking about are number at .050 my cams are very aggressive and the .200 lift number are a lot bigger than others lobes of similar number.
Same on my street grinds. My base street intake lobe is 184 2 .050. Others advertise bigger, but in reality they are just bigger at .050, not .200 where air flow is really moving