i have no vacuum!

tomst9

Founding Member

Jun 17, 2002

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Bethlehem Pa

Apr 12, 2004

#1

• Apr 12, 2004

• #1

ever since i put my cam in, my brakes haven' worked very well, especially at idle. I threw a vac. guage on today and when the car is fully warmed up i got 8 in.hg of vac. Is that ok. What should it be?. I checked all my vac. lines, but i didn't find any leaks. I know that with the cam i will lose vacuum, but my cam isn' that extreme to lose my power brakes.
thanks
tom

 

dastang2

Active Member

Dec 11, 2003

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tx

Apr 12, 2004

#2

• Apr 12, 2004

• #2

summit sells a vacuum canister with a gauge on it.

 

tomst9

Founding Member

Jun 17, 2002

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Bethlehem Pa

Apr 12, 2004

#3

• Apr 12, 2004

• #3

ttt

 

I

Idwitheld-1`

New Member

Nov 30, 2003

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Portland Oregon

Apr 12, 2004

#4

• Apr 12, 2004

• #4

I have a stock motor and stock cam....had the gauge on today and I have 18 In/Hg hot at idle (900rpm).

Not sure if this helps you....

 

dastang2

Active Member

Dec 11, 2003

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Apr 12, 2004

#5

• Apr 12, 2004

• #5

aftermarket cams lose vacuum but when you had the vacuum gauge on it did it read steady or what.

 

tomst9

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Jun 17, 2002

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Bethlehem Pa

Apr 13, 2004

#6

• Apr 13, 2004

• #6

yes it was steady. I tried playing with the idle some but in order to get 15in.hg i had to have it idle at 1500rpms.

 

dastang2

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Dec 11, 2003

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Apr 13, 2004

#7

• Apr 13, 2004

• #7

if it was steady then i believe it is fine for that cam but i don't really know. i have a real lopey cam and it has plenty of vacuum.

 

blown5.0

Founding Member

Sep 7, 1999

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Central NJ

Apr 13, 2004

#8

• Apr 13, 2004

• #8

sounds normal to me. why do you need 15"hg?. if you list the cam specs I can say whether or not 8" is normal, probably is. is the car an auto or stick?

 

tomst9

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Jun 17, 2002

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Bethlehem Pa

Apr 13, 2004

#9

• Apr 13, 2004

• #9

its an auto

 

blown5.0

Founding Member

Sep 7, 1999

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Central NJ

Apr 14, 2004

#10

• Apr 14, 2004

• #10

thats real low vacuum for an auto, hope you have at least a 2500 stall convertor in it, or its going to be a real dog. you still didnt list the cam specs?

 

tomst9

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Jun 17, 2002

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Bethlehem Pa

Apr 14, 2004

#11

• Apr 14, 2004

• #11

i'm going to a five-speed in the summer and its not that big of a dog off the line anyway. Cam specs are in the sig. 516in/531ex, 217in/226ex
thanks
tom

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Apr 15, 2004

#12

• Apr 15, 2004

• #12

Tom, just a thought, but have you checked the brake booster? if the vac is decent, and you have no assist, then i would look at that possibility.
or run a vac canister as someone mentioned. good luck.

 

tomst9

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Jun 17, 2002

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Bethlehem Pa

Apr 17, 2004

#13

• Apr 17, 2004

• #13

how can i check the booster?
thanks for the replies,
tom

 

dastang2

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Dec 11, 2003

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tx

Apr 17, 2004

#14

• Apr 17, 2004

• #14

well when you push the brakes does it sound like a loud vacuum leak or are your brakes hard to push

 

tomst9

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Jun 17, 2002

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Bethlehem Pa

Apr 18, 2004

#15

• Apr 18, 2004

• #15

i do hear a loud vacuum sound

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Apr 19, 2004

#16

• Apr 19, 2004

• #16

tomst9 said:

how can i check the booster?
thanks for the replies,
tom

Click to expand...

i would try to check it like a FPR. put some vac on it with a miti vac, etc, and see if it holds steady or bleeds off. im not sure exactly how a booster works, but that is my best guess on how one could test it.
good luck, Tom.

 

PrimerdFury

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Feb 26, 2003

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Fountain Hills, Arizona

Apr 19, 2004

#17

• Apr 19, 2004

• #17

I just have an E-cam and have always had a low vacuum problem. That coupled with a leak in the break booster (denoted by the "loud vacuum sound") forced me to finally do something about my brakes not working well since the cam install. To solve the problem I replaced the brake booster and installed a vucuum reservoir canister thing and haven't had any problems since. Good luck