Vacuum readings

[RoadRacer]

How much vacuum does a well running engine pull at 60mph, steady throttle, not accelerating.

Thanks in advance for the help.

 

[Loeryder]

at idle -19 to -20 is normal.

Under throttle its going to vary quite a bit so its safer to compare readings at idle.

 

[sy1907]

I'd say from -11 to -7. It really depends, plus it's been a while since i've looked at the vacuum gauge. I'm perdy sure this is close though. Why, how much are you pulling?

 

[psmvchaser]

I just added a brand new set of silicone vacuum lines and I have about -16 to -17.

 

[kwick6]

 

[Loeryder]

Pictures say a thousand words...

If you're not at least -15 -17 you've got a leak.

Unless of course you have some cam and intake mods that would dramatically effect your vac at idle.

 

[Jimmy]

I have the ATR cam and port matched intakes,my vacuum is rock solid -20

 

[sy1907]

idle, yeah -20, but kwick, that's what you show at 60mph? If so, then i guess it's been toooo long since i've driven a fully functional truck that fast. Come to think of it, it's been at least 7 months.....

 

[fivetodrive]

Shoot I guess I have a leak. I only have about 11 at idle.

Thanks for the thread.

 

[kwick6]

idle, yeah -20, but kwick, that's what you show at 60mph? If so, then i guess it's been toooo long since i've driven a fully functional truck that fast. Come to think of it, it's been at least 7 months.....

oh no, thats idle.

never really look at it when I'm cruising at 60mph.

 

[TyGuyJeff]

I get 20 at idle, and about 17 at 60mph (roghly).

Jeff

 

[RoadRacer]

At idle I show 19", but at a steady throttle 60mph it is only 8". This is a stock truck, no engine or turbo mods of any kind.

Thanks for the reponses.

Bill.