smog pump for a vacum pump
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smog pump for a vacum pump
johndickjr on August 5th 2011, 8:31 am
anyone ever use a smog pump as a vacuum pump? is there any advantages on using a vacuum pump on a factory spec 429 short block
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Re: smog pump for a vacum pump
dfree383 on August 5th 2011, 8:32 am
IMO probably not worth the agrivation on a build like yours.
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Re: smog pump for a vacum pump
johndickjr on August 5th 2011, 8:38 am
that's what i was looking for...would it be worth anything to hook up a header vac system and just use the vacm off the headers..they kit is around 50.00dfree383 wrote:IMO probably not worth the agrivation on a build like yours.
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Re: smog pump for a vacum pump
dfree383 on August 5th 2011, 8:43 am
The header Vac stuff is decent IMO.
Make sure the breathersare in the front of the valve covers and watch what valva covers your use. depending on what hood and how you have the motor mounted you may have clearance issues
Make sure the breathersare in the front of the valve covers and watch what valva covers your use. depending on what hood and how you have the motor mounted you may have clearance issues
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Re: smog pump for a vacum pump
johndickjr on August 5th 2011, 8:49 am
valve cover i got form a member here.ford racing motorsport alum ...they had either a header vac system or a pump on them, they already have holes for breather drilled into the front of each onedfree383 wrote:The header Vac stuff is decent IMO.
Make sure the breathersare in the front of the valve covers and watch what valve covers your use. depending on what hood and how you have the motor mounted you may have clearance issues
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Re: smog pump for a vacum pump
BigDave65 on August 5th 2011, 1:17 pm
dfree383 wrote:The header Vac stuff is decent IMO.
Make sure the breathersare in the front of the valve covers and watch what valva covers your use. depending on what hood and how you have the motor mounted you may have clearance issues
Does it really matter if they are in the front or not? Never heard that before. I don't think I could put mine in the front anyway, they barely clear with both to the back.
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Re: smog pump for a vacum pump
richter69 on August 5th 2011, 1:38 pm
honestly the header evac deals can be more trouble than they are worth, even when set up with the good valves and stuff we never saw more than 1"-2"'s, and if a valve sticks shut or both now you wave pressure blowing all the oil past the seals, or worse case you get one stuck open and possible blow the covers off of it lol.
The factory smog pumps can and do work, but for the effort and no longer than they live its also not worth it IMO.
If a guy needs an evac for ring seal a race pump is the way to go, if to remove moisture with alky etc then the electric deals work good.
If you just need a vent a good baffled breather on each cover or better yet a large hose connecting each one to a puke tank with a filter is best.
This is based on my experiences with them in the past.
The factory smog pumps can and do work, but for the effort and no longer than they live its also not worth it IMO.
If a guy needs an evac for ring seal a race pump is the way to go, if to remove moisture with alky etc then the electric deals work good.
If you just need a vent a good baffled breather on each cover or better yet a large hose connecting each one to a puke tank with a filter is best.
This is based on my experiences with them in the past.
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Re: smog pump for a vacum pump
whatbumper on August 5th 2011, 1:42 pm
richter69 wrote:honestly the header evac deals can be more trouble than they are worth, even when set up with the good valves and stuff we never saw more than 1"-2"'s, and if a valve sticks shut or both now you wave pressure blowing all the oil past the seals, or worse case you get one stuck open and possible blow the covers off of it lol.
The factory smog pumps can and do work, but for the effort and no longer than they live its also not worth it IMO.
If a guy needs an evac for ring seal a race pump is the way to go, if to remove moisture with alky etc then the electric deals work good.
If you just need a vent a good baffled breather on each cover or better yet a large hose connecting each one to a puke tank with a filter is best.
This is based on my experiences with them in the past.
I agree
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Re: smog pump for a vacum pump
dfree383 on August 5th 2011, 2:42 pm
BigDave65 wrote:dfree383 wrote:The header Vac stuff is decent IMO.
Make sure the breathersare in the front of the valve covers and watch what valva covers your use. depending on what hood and how you have the motor mounted you may have clearance issues
Does it really matter if they are in the front or not? Never heard that before. I don't think I could put mine in the front anyway, they barely clear with both to the back.
Yes it matters, iif you put them in the back they will pick-up oil on hard acceleration.
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Re: smog pump for a vacum pump
BigDave65 on August 5th 2011, 3:19 pm
OK, that makes sense, never thought about that. I do get a little oil from around the breathers, but I don't have room to put them in the front.
Around here we used to do what we called "a Rutherford County thing", one of the early drag racing hero's around here used to take a tube sock and cut the toe out of it, roll it up and place it around the breather to keep oil from leaking past (BBC). Seemed we only saw that on our local cars.
Around here we used to do what we called "a Rutherford County thing", one of the early drag racing hero's around here used to take a tube sock and cut the toe out of it, roll it up and place it around the breather to keep oil from leaking past (BBC). Seemed we only saw that on our local cars.
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Re: smog pump for a vacum pump
the Coug on August 5th 2011, 3:28 pm
dfree383 wrote:BigDave65 wrote:dfree383 wrote:The header Vac stuff is decent IMO.
Make sure the breathersare in the front of the valve covers and watch what valva covers your use. depending on what hood and how you have the motor mounted you may have clearance issues
Does it really matter if they are in the front or not? Never heard that before. I don't think I could put mine in the front anyway, they barely clear with both to the back.
Yes it matters, iif you put them in the back they will pick-up oil on hard acceleration.
If you have that much oil under accelleration you have way more problems than that!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Re: smog pump for a vacum pump
johndickjr on August 5th 2011, 4:21 pm
dont really need it, valve covers i got hav the holes cut in the on the front on the ends where they had a pump plumed in,,..guess i will just plug it or put breather there..
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Re: smog pump for a vacum pump
rmcomprandy on August 7th 2011, 6:37 pm
Pro Stockers and all other MAJOR class type drag race cars who could use a crank-case vacuum pump in the beginning of drag race vacuum pumps, began using a belt driven FORD truck, 3 vane, 23 cubic inch SMOG PUMP.
I have personally supercharged a Chevette with a 1600 cc, 4 cylinder engine using two automotive 21 cubic inch, 2 vane smog pumps.
The carbon vanes have their RPM limitations so, the drive ratio must be controlled but, it is NOT a waste.
I have personally supercharged a Chevette with a 1600 cc, 4 cylinder engine using two automotive 21 cubic inch, 2 vane smog pumps.
The carbon vanes have their RPM limitations so, the drive ratio must be controlled but, it is NOT a waste.
Last edited by rmcomprandy on August 8th 2011, 9:04 am; edited 2 times in total (Reason for editing : I got the engine cc's wrong the first time)
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Re: smog pump for a vacum pump
69F100 on August 7th 2011, 7:39 pm
I run a electric smog pump off a 99 comaro after running on alky I can leave it running after I shut the engine down to help pull some of the moister build up out.It also works better on mine than just the header evac system my max rpm is set at 6500.Just my 2 cents
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