Cams timing and all that

[Carl Summers]

Robert Humphris wrote:
> 
> Some while back someone wrote that advancing cam timing improved low end
> response.
> 
> Now I know that this will result in loss at high end, probably peak
> torque will move down the rev range please could someone confirm this?
> 
> The crux of the matter is this:  I am gonna run my engine at 7.5:1 as I
> want to run silly ammounts of boost.  To help eliminate lag, I was
> thinking of running a whole load of ignition advance, and advancing the
> cam to give me a tractable ammount of low end off boost.  No I know that
> a gain in one area comes with a fall in another... so what pit fall am I
> going to get here?
> Is the engine going to get upset with the cam timing and refuse to rev
> above a certain level? or is there something I just cannot see yet?
> 
> Rob Humphris

Hi Rob,
    Generally,(lots of variables) advancing a camshaft 4 degrees moves
the peak torque rpm down 300-400 rpm and depending on your torque slope
this could make some difference on how quickly you start your aspirated
increase in VE....If this is for a car you plan to get groceries
in,,,keep in mind a cam with less exhaust duration than intake and 112LC
installed on 108 intake LC(4 degrees advanced) helps spool the turbo
faster as the slight amount of less duration gives the turbo a high
velocity pulse at low engine speeds...HTH's
-Carl Summers