Vacuum at idle?

[lime73]

Is anyone else using Mopar Performance cam#P4452993 Purple Shaft?   If so are you having problem getting good vacuum at idle?  i am only able to get about 10-12in at 900rpm idle.   If this is normal i am going to have to add a vacuum canister for power brakes.  Any thought on those??

[ireland383]

I'm running a Comp cams 275DEH with I think 482 lift and have 12 vac at idle with power brakes. No problems with the brakes. What Mopar cam is that? 484. Are you having trouble with your brakes?

[72cudamaan]

12 in should be plenty for brakes.

[Chryco Psycho]

That sounds about right for vacuum , is the timing set around 16* at idle ?

[74CudaDave]

Yup, I have that cam and that's about what I get at idle. Can you get your's to idle in gear lower than 1000 rpm?

[oldkimmer]

.................Thats about normal 4 that cam.................dont forget that factory cams only pulled 15-16 inches of vacc.............kim..........