Vacuum / Boost?

I just finished my rebuilt motor again the last time I noticed 10 psig. of vacuum on my Auto meter Boost / vacuum gauge. This time setting at idle it reads 21 psig of vacuum. During normal driving it maintains 10 psig. of vacuum.

Is that normal?

Reason for rebuild was 3 blown piston rings 3-bad pistons, 3 bad valves and guides. We also repaired the passenger side head which had 3 lobes where the spark plugs come through that were melted about 20% .

Suavy

 

Thats exactly what I see.....well ...almost exactly.

 

Do you have a built motor also?
I have port and polished heads & intake and 1MM over sized valves.


Thanks for the info

Suavy

 

Nope sorry.....stock block with the esxception of Manley rods....not that, that would effect anything. I see around 10 at cruising and about 21-23 at idle.

 

Thanks for the info.


Suavy

 

that about what i see on my built motor.

I see anywhere from 19-21 idle and about 10 going down the highway.

 

I see about the same also.But just for g.p. the boost gauge reads boost in psig it reads vac. in in.hg which is inches of mercury.Now what its equivilent to as far as psig im not really sure i havent had the chance to check that out yet.But yeah,i see about 10inhg at cruise then when i let off i see about 21-20 inhg.

mike
02 true blue
jdm enhanced
6#,chip,filter,full length exhaust,
throttle body,heat x-changer,&
traction devices
11.98@112(so far)

 

That is pretty close to what I see and I have the above. Except the intake and heads aren't polished.

 

Thanks for the info. It's cool to have my truck runing again! I'm driving it like a frigging grand ma right now! I haven't even broke the tires loose yet!

 

I'm sure you thought of this, but if you put it on a mustang dyno they can similate a 1/4 mile run, shiftng through the gears and sucha and monitor the engine at specific speeds and RPM's.

Food for thought.

 

BTW:
park that thing, there is salt on the roads!