How much does porting affect vacume
04-23-02, 02:13 PM
#1
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How much does porting affect vacume
I'm curious how much the different types of port affect vacume. Does your vacume get lower the bigger the ports become???
Is there anything else that can affect vacume besides a port, a leak, or a bad seal???
What kind of vacume are people pulling with ported engines and how ported is it (if you know)?
Thanks,
STEPHEN
Is there anything else that can affect vacume besides a port, a leak, or a bad seal???
What kind of vacume are people pulling with ported engines and how ported is it (if you know)?
Thanks,
STEPHEN
04-23-02, 05:36 PM
#2
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Typical stock port - 18" to 20" of vacuum
Mild streetport - 18" to 14" of vacuum
Wild streetport - 16" to 12" of vacuum
Bridgeport - 14" to 10" of vacuum
PP - 12" to under 10" of vacuum
Bigger the port, lower the vacuum...
http://fc3s-pro.com/TECH/PORT/porting.html
-Ted
Mild streetport - 18" to 14" of vacuum
Wild streetport - 16" to 12" of vacuum
Bridgeport - 14" to 10" of vacuum
PP - 12" to under 10" of vacuum
Bigger the port, lower the vacuum...
http://fc3s-pro.com/TECH/PORT/porting.html
-Ted
04-23-02, 06:17 PM
#3
Banned. I got OWNED!!!
My street port pulls around 12 to 13" of vacume.
If you have a little hose blown off the plenum you will notice a higher than normal idle with a lower than normal vacume as well.
If you have a little hose blown off the plenum you will notice a higher than normal idle with a lower than normal vacume as well.
04-23-02, 10:48 PM
#4
Hey, where did my $$$ go?
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ok, I was just making sure. I've got a pretty agressive streetport that pulls around 12-13 also. Just wanted to make sure I was ok
lol
STEPHEN
lol
STEPHEN
04-24-02, 02:03 AM
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That motor properly broken in yet?  I find that the idle vacuum doesn't really start stabilizing until after 5,000 miles after a rebuild!  Maybe my rebuilds take too long to break in! 
-Ted
-Ted
04-24-02, 09:01 AM
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Originally posted by RETed
That motor properly broken in yet?  I find that the idle vacuum doesn't really start stabilizing until after 5,000 miles after a rebuild!  Maybe my rebuilds take too long to break in!
-Ted
That motor properly broken in yet?  I find that the idle vacuum doesn't really start stabilizing until after 5,000 miles after a rebuild!  Maybe my rebuilds take too long to break in!
-Ted
I dont have quite that many miles on it yet. I probably have about 3000 on it now. Maybe after another couple thousand the vacume will increase if thats been the case. I wasnt aware of that.
Hopefully its not just your rebuild
STEPHEN
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04-24-02, 05:58 PM
#10
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Originally posted by SPOautos
Can tuning affect the amt of vacume you pull???
If so how?
Can tuning affect the amt of vacume you pull???
If so how?
We found that out by accident while tuning on Haltechs.
A 13B-REW streetport was barely registering 10" of vacuum when we had the ignition timing WAY off by about 30°!  Getting the ignition timing back to TDC brought it back to about 14"...
We thought it was weird!
-Ted
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