Dynosim and Cam Data

This is a very old post and I really need to do a video or something on entering the data. Maybe in the next few months I'll try and do that.

The earlier version of this page was overly complex and had one or two errors on intake centerline and lobe center angle and so the page was due for an update with the new version of DynoSim. DynoSim was originally Dyno2000 and was Desktop Dyno before that. The newest version of the program is the best and the Virtual Engine Masters version even better still. It gives you an engine masters score which can be used to optimize a HP or TQ range. There are six pieces of data you will need to enter any cam into DynoSim:

Intake Duration
Exhaust Duration

Lobe Seperation Angle
Intake Centerline

Intake Lift
Exhaust Lift

You'll also need to know if the cam is measured old-school seat-to-seat method, or the more modern .050 method. Most manufactured give data for both. On the comp cam card above, look at the bottom of the card to find the Duration at .050 and you will see that it is 232 and 240. The old-school measurement is at the top and is 282 and 290. Use 050 if you can to be consistant. The lobe seperation angle is 112 degrees and that is at the bottom as well. Now if a cam is installed "straight up" then it has an intake centerline of 112 as well. Most are not and the recommended intake centerline on this cam is 108 degrees and this is also in the bottom paragraph. You enter this data just like this...

On the crane card you have to make one calculation...and that is the lobe seperation angle. On this card, again go to the bottom and you will see the stats at 050. The duration in this case is 246 and 254. The lift is in the third paragraph at the top and is .579 and .598. The intake angle is in the same spot as the duration and it is 108. Crane does not give us the lobe seperation angle, instead they give us the exhaust angle of 112 and so we divide the two to get 110 as the seperation angle. This is how this data is entered: And that is how to enter cam data into DynoSim. The big catch is the intake centerline. One more thing to note is the Lifter Acceleration Rate...let DynoSim estimate this.