Post your vacuum at an idle

2bav8

Founding Member

Nov 30, 1998

2,511

1

47

Mesa, AZ

Feb 26, 2004

#1

• Feb 26, 2004

• #1

Got a kick out of everyone's idle RPMs.
Just curious what vacuum everyone is pulling.

I manage 7" at 900 RPM

 

mustang70

Founding Member

Nov 15, 2001

2,445

2

48

San Diego

Feb 26, 2004

#2

• Feb 26, 2004

• #2

Ummm.....I think it was around 18" last time I checked.

 

I

INDSKYS

New Member

May 24, 2003

245

0

0

CALIFORNIA

Feb 27, 2004

#3

• Feb 27, 2004

• #3

18 To 22

 

hungrymonkey

White by Birth, Trash By Choice

Founding Member

Nov 29, 1999

3,077

12

108

Oregon.

Feb 27, 2004

#4

• Feb 27, 2004

• #4

before the motor blew in my truck. it was 16-17 mmhg.

 

crushnut

New Member

Apr 27, 2003

870

0

0

Oregon

Feb 27, 2004

#5

• Feb 27, 2004

• #5

19 to 20

 

1

10secgoal

Active Member

Dec 1, 2003

2,801

3

49

San Diego

Feb 27, 2004

#6

• Feb 27, 2004

• #6

10-11in.

 

2nd Mustang

Founding Member

Feb 24, 2002

2,488

0

46

Southern California

Feb 27, 2004

#7

• Feb 27, 2004

• #7

12 at 1000 rpm idle.

 

O

Ozsum67

Too much thin air

Founding Member

Jan 6, 2002

5,152

0

0

Eastern Colorado

Feb 27, 2004

#8

• Feb 27, 2004

• #8

20" and a rock steady needle at 4200' in elevation, which translates to 24"+ at sea level.

 

pabear89

Active Member

Apr 15, 2003

2,126

0

46

High in the Hills of So Ca with the Voices in My H

Feb 27, 2004

#9

• Feb 27, 2004

• #9

15 in at idle

 

blown65

Founding Member

Jul 7, 1999

1,938

4

39

Queen Creek Arizona

Feb 27, 2004

#10

• Feb 27, 2004

• #10

9" at 1500 rpm idle.

 

69 302/351c

Founding Member

May 29, 2001

1,147

0

36

Walkertown NC, originally Western Mass

Feb 27, 2004

#11

• Feb 27, 2004

• #11

18 " at idle on both cars at about 800 rpm.

 

M

my66coupe

Founding Member

Apr 30, 2002

1,134

0

36

Arizona fountain hills

Feb 27, 2004

#12

• Feb 27, 2004

• #12

15 at idle, on my old engine. A engine will make worse vacumm with a larger cam correct? This makes it difficult to tune, I assume.

Mike

 

crushnut

New Member

Apr 27, 2003

870

0

0

Oregon

Feb 27, 2004

#13

• Feb 27, 2004

• #13

my66coupe said:

15 at idle, on my old engine. A engine will make worse vacumm with a larger cam correct? This makes it difficult to tune, I assume.

Mike

Click to expand...

Correct

 

M

my66coupe

Founding Member

Apr 30, 2002

1,134

0

36

Arizona fountain hills

Feb 27, 2004

#14

• Feb 27, 2004

• #14

Sorry to go off topic for a bit, but when you set your timing, it is correct to set it to where you get the largest amount of vacumm at a idle?

Mike

 

L

Lswhat

New Member

Feb 9, 2004

126

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0

Orlando

Feb 27, 2004

#15

• Feb 27, 2004

• #15

20

 

W

wickedmach1

New Member

Apr 8, 2003

376

0

0

Austin, TX

Feb 27, 2004

#16

• Feb 27, 2004

• #16

What is a safe number for vacuum if you are using power disc brakes on front and drums on rear for my 70 Mustang? Don't care to use a vacuum pump?

 

12sec67

Active Member

Oct 6, 2003

1,301

1

36

San Diego, Ca

Feb 27, 2004

#17

• Feb 27, 2004

• #17

18 at 1000 rpms

 

6

67GTA-FB429

Member

Dec 15, 2003

777

0

16

Tri-Cities, Wa

Feb 27, 2004

#18

• Feb 27, 2004

• #18

just played with mine today....

12 at idle, and lumpy (see cam specs)

 

2nd Mustang

Founding Member

Feb 24, 2002

2,488

0

46

Southern California

Feb 27, 2004

#19

• Feb 27, 2004

• #19

wickedmach1 said:

What is a safe number for vacuum if you are using power disc brakes on front and drums on rear for my 70 Mustang? Don't care to use a vacuum pump?

Click to expand...

I have a mild hyd roller cam and with 12 in. of vacuum, my power front discs and rear drums work just fine. Actually those darn Kelsey-Hayes 4 piston calipers on front are really grabby, even with only 12 in. of vacuum. I think I read somewhere that less than 12 in. would be a problem on power brakes, but not sure of the minimum vacuum needed.

 

ashford

Member

Dec 19, 2003

485

0

16

fargo ND

Feb 28, 2004

#20

• Feb 28, 2004

• #20

16 on 289 in falcon
8 on 302 in capri