Vacuum filter direction?
02-28-2019, 04:13 PM
#1
Burning Brakes
Thread Starter
Vacuum filter direction?
Hi all!
needed to replace the white vacuum check filter that comes directly off the carburetor and goes to the vacuum lights on a 1969.
What direction does it need to face-meaning what flow of vacuum do u want open and closed?
so which way do we want to PREVENT flow...back towards the engine?
thanks!
needed to replace the white vacuum check filter that comes directly off the carburetor and goes to the vacuum lights on a 1969.
What direction does it need to face-meaning what flow of vacuum do u want open and closed?
so which way do we want to PREVENT flow...back towards the engine?
thanks!
02-28-2019, 04:54 PM
#2
Race Director
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Engine pulls vacuum so it has to allow flow TO the engine
M
BTW, the check valve is the 3 pipe one (single to the engine) and the filter is the white plastic one, doesn't matter the direction IIRC
M
M
BTW, the check valve is the 3 pipe one (single to the engine) and the filter is the white plastic one, doesn't matter the direction IIRC
M
Last edited by Mooser; 02-28-2019 at 04:56 PM.
02-28-2019, 11:10 PM
#3
Burning Brakes
Thread Starter
Hey Moosser!!! Thanks as always!
lit is the Plastic piece. So allow flow TO the engine. Stopping from going away from engine. (One way open TO engine). I believe I got it.
BTW. If we are not being purists. I found a black DORMAn. #47170. $5. Not original look. But the black looks better.
lit is the Plastic piece. So allow flow TO the engine. Stopping from going away from engine. (One way open TO engine). I believe I got it.
BTW. If we are not being purists. I found a black DORMAn. #47170. $5. Not original look. But the black looks better.
03-01-2019, 07:28 AM
#4
Dr. Detroit
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As a note....be weary of aftermarket check valves, I bought a new one from a Big Box Vette outlet and it is like it is partially blocked.....lets very little vacuum through.
Jebby
Jebby
03-01-2019, 01:33 PM
#6
Le Mans Master
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Hey Moosser!!! Thanks as always!
lit is the Plastic piece. So allow flow TO the engine. Stopping from going away from engine. (One way open TO engine). I believe I got it.
BTW. If we are not being purists. I found a black DORMAn. #47170. $5. Not original look. But the black looks better.
lit is the Plastic piece. So allow flow TO the engine. Stopping from going away from engine. (One way open TO engine). I believe I got it.
BTW. If we are not being purists. I found a black DORMAn. #47170. $5. Not original look. But the black looks better.
03-01-2019, 04:51 PM
#7
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Just so we're all on the same page
Check valve on the left, single tube to the engine, (on the other side, one tube to the reservoir and the other to the headlight switch)
Filter on the right, doesn't have a direction, works either way
M
Check valve on the left, single tube to the engine, (on the other side, one tube to the reservoir and the other to the headlight switch)
Filter on the right, doesn't have a direction, works either way
M
03-01-2019, 04:52 PM
#8
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Last edited by Mooser; 03-01-2019 at 04:53 PM.
03-02-2019, 04:37 PM
#9
Burning Brakes
Thread Starter
A filter? So what does it do then...? (Besides acts as a. Filter).
mine broke open. So I have 2 pieces. No clue if there is something inside. All I get when I go WOT is 2 pieces~ it just pops apart. If there was something in there. It isn’t anymore.
mine broke open. So I have 2 pieces. No clue if there is something inside. All I get when I go WOT is 2 pieces~ it just pops apart. If there was something in there. It isn’t anymore.
03-02-2019, 04:39 PM
#10
Burning Brakes
Thread Starter
Also. I thought the vacuum built up and was stored In The reservoir. ?
thanks!
btw. It is a 468 w big cam. So no real vacuum anyway.
thanks!
btw. It is a 468 w big cam. So no real vacuum anyway.
03-02-2019, 04:46 PM
#11
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The filter is just there so no debris (rust, etc) from the rest of the system (headlight actuators, valves, tank, etc), doesn't get sucked into the engine, those vac ports lead to the combustion chambers.
The engine is always pulling vacuum (what it can anyway) and the reservoir just give it enough volume (or lack of volume...) to activate the headlights etc otherwise they would be really slow as the engine tried to draw all that "air" out of the actuators a little at a time. Same like the brake booster reservoir, needs a bunch of volume at once
M
The engine is always pulling vacuum (what it can anyway) and the reservoir just give it enough volume (or lack of volume...) to activate the headlights etc otherwise they would be really slow as the engine tried to draw all that "air" out of the actuators a little at a time. Same like the brake booster reservoir, needs a bunch of volume at once
M
03-02-2019, 04:48 PM
#12
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Oh, and also lets you lower the lights after you shut the car off... or should be enough stored (un-stored?) for it to close them
M
M
03-03-2019, 10:03 AM
#13
Burning Brakes
Thread Starter
Thanks! Yeah I have barely any vacuum w the big cam.
Bc I don’t produce any vacuum. For brake booster, I installed a bandit vacuuum pump. Works like a dream.
So so it is just a filter. Thanks!
Bc I don’t produce any vacuum. For brake booster, I installed a bandit vacuuum pump. Works like a dream.
So so it is just a filter. Thanks!
