Can you fill the tank with your portable pump?

On Sat, Oct 24, 2009 at 11:53 AM, Max Wellhouse <dimwittedmoose@cfu.net>wrote:

> I want to test my combustion chambers for percentage leak down and
> have a gauge tool on the way to accomplish that.  My question is
> whether I have to have a real air compressor to do the testing?  I
> have  a air tank I can take to a gas stationand fill it to 120 psi
> safely,and am wondering if that is adequate?  Might have to make more
> than one trip to finish all 4 cylinders, but my only other
> alternative is to use an electrical tire pump from Campbell Hausfield
> and try to fill the combustion chamber that way. Since the pistons
> will be at top dead center, I would think that the volume of air
> needed would be minimal; like under 200ccs, but I could be
> wrong.  Probably not a bad idea to lock the crank too.  Will report
> findings when the job is done.
>
> Thanks
>
> DM&FS
>