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Normal? vacuum numbers? (What does yours push?)

  • Thread starter Thread starter FastGT94
  • Start date Start date Aug 10, 2004

FastGT94

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Nov 20, 2003
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NW Burbs, IL
Aug 10, 2004
#1
  • Aug 10, 2004
  • #1
Greetings!

I just got done replacing practically every gasket on the engine with the exception of the head gaskets since my car was running lean on the dyno and couldn't be corrected with more fuel / less timing.

Before I go and spend even more $$ on a dyno tune only to have it tell me that I'm running lean again, what kind of vacuum numbers do your cars give out?

Mine has between 11-12 (Needle moves a bit) at idle (~700 RPM's) My cam is similar in size to a X-303 with a little less lift on the exhaust side but more duration on the exhaust (split reverse duration). Ed tells me that the cam should push around 13-15 and that I need to start checking hoses. (all the hoses are connected and fine with no cracks...)

My only two areas that I even think could have a problem is the upper to lower gasket since the egr tube was like a 32nd of an inch too long but I had figured that tightening the bolts on the upper would crush it down (made it out of soft copper tubing). Also, I noticed that, with a bit of force, I can turn the neck on the valve cover, since this is a place that also has vacuum, wouldn't this be a potential leak of at least a pound? Do either of these sound like they need attention?

If anyone with an aftermarket cam could take the time to quickly hook up a vacuum gauge and give me some readings, I'd really appreciate it.

If my numbers are indeed low, where else can I look besides the upper to lower gasket and the Valve Cover neck? Can a blown Head Gasket make a vacuum leak?

Thanks for the help! I'm hoping to finally have the car running and trouble free REAL soon!!
 

RacEoHolic330

I like to dress like a pretty girl
15 Year Member
Mar 4, 2003
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Allentown, PA
Aug 10, 2004
#2
  • Aug 10, 2004
  • #2
I've got a b-31 cam with .544/.544 lift and 218/228 duration and I push about 14-15 at 800 idle. One way to tell if there is a leak is to rev the engine and if the vac needle moves up towards 0 and back down really quick, you don't have a vac leak. Also, take the car out for a drive and press the brake pedal down a bunch of times. If the braking quality gets worse and worse and the pedal gets harder and harder to push, you have a leak. Check ALL the vacuum lines, especially if they are the vulerable stock plastic lines.
 

FastGT94

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Nov 20, 2003
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NW Burbs, IL
Aug 10, 2004
#3
  • Aug 10, 2004
  • #3
ttt
 

stockhatch

Founding Member
Oct 9, 2001
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polar sloth country
Aug 10, 2004
#4
  • Aug 10, 2004
  • #4
I pulled 11 inches with my E-303.

AC
 

FastGT94

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Nov 20, 2003
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NW Burbs, IL
Aug 11, 2004
#5
  • Aug 11, 2004
  • #5
Did your needle hold completely still at 11 or move around just a tad? (Say between 10.5-11.5?) Mine moves just a bit, but doesn't necessarially jump, just kind of "hovers" in the vicinity of 11 but never stays completely in one spot.

Thanks AC.
 

stockhatch

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Aug 11, 2004
#6
  • Aug 11, 2004
  • #6
Yeah, it may have moved just a tad as the idle was relatively choppy. Maybe like you said, from 10.5-11.5.

AC
 

FastGT94

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Nov 20, 2003
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NW Burbs, IL
Aug 11, 2004
#7
  • Aug 11, 2004
  • #7
Thanks!
 

stockhatch

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polar sloth country
Aug 11, 2004
#8
  • Aug 11, 2004
  • #8
Have you tried the old "spray with carb cleaner while its running" tecnique? Hope you get it nailed down.

AC
 

FastGT94

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NW Burbs, IL
Aug 11, 2004
#9
  • Aug 11, 2004
  • #9
Did that as well as the propane method. Since I re-did all the gaskets and checked every hose, I'm confident there is no leak. I'm going to check once more tonight and then I'm done checking for that BS
 
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