Comp cams xe268h for 318
first of all dartfreak get away from comp for any hyd shorter than HE275 there are much better choices
I would not use the comp XE268 I do not like to give up area under the curve
however comp does show the .006 timing on their individual cam webpages- however sometimes they show the .050 and call it .006
always check 180 + Intake open + intake close should add up to the intake .006 duration if it adds up to the .050 duration - well what's not to like or WTF
other vendors with .006 specs should give the same intake close at the same duration and lca or you can calculate from there
low compression LA motor I'd try and keep the intake closed to earlier than 56 @.006 problem with the XE256 is lack of lift/ area
(compare with a OHCam motor where they can get good lift with short duration- size of the lifter makes a big difference)
understand what nm is trying to say
AJ the Hughes/ Engle were .008 most likely .006 now
This all gets to what works for the generic Mopar hot-rodder. Comp's data and the Wallace tool(s) are the easiest way for newcomers to tackle the DCR computation. (IF the static CR is well known, which is another Wallace tool.)
This gets to a point in the cam specs that helps Comp.... they PUBLISH the ICA clearly in their website literature. Who else does that? So when someone such as DartFreak starts to learn this, they ask the same question as in post #230: where do you get the ICA? With no cam card in-hand, and no ICA listed in the published literature for Howards, Lunati, Crane, Hughes, Racer Brown, etc., Comp becomes the easy de-facto website to go to. No surprise then that DF looks at Comp's cams. Yeah, it may not be the best choice for other reasons, but making it easy is what Comp does better than any other MFR.
Cam specs are confusing for most newcomers. Computing the ICA from LSA and advertised duration is another step of learning. AJ lays it all out in post #236, but I can see many despairing at the thought of pulling out a calculator. It needs to be in an app to get folks to adopt this thinking more.
The DCR tool that I like does the ICA computation for you in a simple visual tool, including static CR computation. But then, like for the case shown by DF's situation with no PC, it is not directly available as an app for a Smartphone. (I have not tried to run it on mine but it looks like it might work.)
DF, have you tried that download and running the tool that I linked, on your Smartphone?
