Smog pump delete ?s
Thread Starter
Rennlist Member
Joined: May 2003
Posts: 8,706
Likes: 153
From: Frankenmuth, Michigan
Smog pump delete ?s
Well, I'm ready to remove my smog pump, and I have a few questions:
What plumbing do I remove? Can I remove all the plumbing (smog pump related) shown in the pic below?
- Sean79 5spd wrote:
"Actually the only line that need to be capped is the small vacuum line that goes to the valve three way valve. The hose from the air pump to the metal pipe on top of the cam cover should be removed to avoid it getting caught in the AC compressoer. The balance of of this sytem right up to the check valves at the exhaust system can be left in place or removed, up to you."
Where is this small vacuum line Sean is referring to?
Note: since my car originally didn't have a smog pump, and one was added upon fedralization; it is possible the system is not stock.
Also, I have no CAT, never had one.
Thank in advance!
What plumbing do I remove? Can I remove all the plumbing (smog pump related) shown in the pic below?
- Sean79 5spd wrote:
"Actually the only line that need to be capped is the small vacuum line that goes to the valve three way valve. The hose from the air pump to the metal pipe on top of the cam cover should be removed to avoid it getting caught in the AC compressoer. The balance of of this sytem right up to the check valves at the exhaust system can be left in place or removed, up to you."
Where is this small vacuum line Sean is referring to?
Note: since my car originally didn't have a smog pump, and one was added upon fedralization; it is possible the system is not stock.
Also, I have no CAT, never had one.
Thank in advance!
928 Engine Re-Re-Rebuild Specialist
Rennlist Member
Rennlist Member
Joined: Oct 2001
Posts: 7,972
Likes: 34
From: Brighton, MI
Very good question, Jim, and one that I'd like to hear the answer for, too. I know that two other guys in the area have eliminated the smog pump recently after finally locating the right belt to just turn the fan (it's a belt from a lawnmower I believe). Cats are an endangered species 'round these parts. 
Addict
Rennlist Member
Rennlist Member
Joined: Jun 2001
Posts: 3,721
Likes: 149
From: Elk Grove, Ca
Jim, I can take a look tonight at my set-up for you. The 84 Euro S motor I installed came with a smog pump and related plumbing, however it isn't needed on the 1980 car the motor is in. 1980 didn't have a smog pump, so California doesn't require one to be there. I removed the pump, and basically just plugged up the tube/hose behind the cam tower....I think that is what you circled. I left all the plumbing back there in case the pump ever has to be re-installed. I think mine has a Ford 3-way vacuum valve that yours does not....it is located at the end of the pipe along the top of the cam tower...in your picture it would connect the pipe to the circled hose. I think I removed and saved all that stuff, I'll check later. I belive Sean would be referring to that kind of vacuum valve. Hope this can help. Let me know if you have any questions or need pics.
Rich
Rich
Addict
Rennlist Member
Rennlist Member
Joined: Jan 2003
Posts: 412
Likes: 0
From: Mayne Island, B.C. Canada
Jim, the vacuum line I was referring operates a valve which sits on the firewall end of the metal pipe running along the top of the cam cover. This pipe receives air from the air pump on one end. This air is then directed by the three way valve (based on vacuum condition) to either the air intake port at the exhaust or to the air cleaner. Basically all the plumbing can remain, including the small vacuum line.
928 Engine Re-Re-Rebuild Specialist
Rennlist Member
Rennlist Member
Joined: Oct 2001
Posts: 7,972
Likes: 34
From: Brighton, MI
This may be a silly question, but how hard is it to remove the smog pump? What stuff is in the way? My cats are long gone and the pump has been pushing air for no reason for about 6 months. It's time to eliminate it, but I've been too lazy to tackle removal yet.
Nordschleife Master
Joined: Jul 2003
Posts: 7,743
Likes: 78
From: Minneapolis
I've removed all of the plumbing from my Euro S. That leaves two holes on the back of the heads. I've used some hardware from the plumbing section of Home Despot to seal them but have realized that the holes are likely the same as on the front and am getting the "real" plugs.
I exchanged email with someone (damn synapses) who just left it all on and relied on the one-way valve to essentially seal the system. The vacuum line controls the air flow and is not providing signal.
So that leaves the pump. I recently disassembled mine and removed the pump flaps. Now it's just a belt tensioner.
I exchanged email with someone (damn synapses) who just left it all on and relied on the one-way valve to essentially seal the system. The vacuum line controls the air flow and is not providing signal.
So that leaves the pump. I recently disassembled mine and removed the pump flaps. Now it's just a belt tensioner.
Trending Topics
Inventor
Rennlist Member
Rennlist Member
Joined: Sep 2002
Posts: 10,219
Likes: 469
The air pump has only one long bolt and one short attaching it to the engine.
The pipe and bypass valve shown in the first picture can come out. Make sure to plug the airbox connection.
I would not count on the one-way valve to seal, it probably leaks if original.
Once the air pump is removed, and if you do not have cats, but do have air injection into the exhaust, you can run a hose from the oil fill cap to the one-way valve and have a crank vent!
The pipe and bypass valve shown in the first picture can come out. Make sure to plug the airbox connection.
I would not count on the one-way valve to seal, it probably leaks if original.
Once the air pump is removed, and if you do not have cats, but do have air injection into the exhaust, you can run a hose from the oil fill cap to the one-way valve and have a crank vent!
Rennlist Stories
The Best Porsche Posts for Porsche Enthusiasts
Every Era of 911 Owner Explained in One Sentence
Verdad Gallardo
Thinking of Buying a Porsche? Do These 10 Things First
Joe Kucinski
Pixar Pals Turned Into 1-of-1 Porsches!
Michael S. Palmer
Theon Goes Full Carbon Fiber With Stunning New Build
Verdad Gallardo
Genius Porsche-Themed Gifts That'll Make Any Dad or Grad Smile
Joe Kucinski
10 Used Porsches Are Selling for Way Too Cheap
Joe Kucinski
Tuner Is Converting Porsche 911s Into Shooting Brakes
Verdad Gallardo
This Coachbuilt Creation Is A Modern Take on the Legendary Porsche 917
Verdad Gallardo
Is This Convertible Cayenne A Steal, Or A Returnless Investment?
Verdad Gallardo
Thread Starter
Rennlist Member
Joined: May 2003
Posts: 8,706
Likes: 153
From: Frankenmuth, Michigan
Well, I removed the smog pump, and related plumbing. Pretty straight-forward. Thanks everyone for the tips.
GlenL, have you ordered those caps for the back? Do you have a p/n?
Mark K, you mentioned to cap of the btm of the airbox. Is it possible to just run a hose from the airbox straight to the piping at the rear of the cam towers?
Sean, I found and plugged that small line.
When I started Chewy... btw, it is amazing how smooth it sounds without the viscous fan running (been deleted). I checked the air pressure (by touch) of the pipe at the rear of the cam tower. There didn't to be any +/- pressure. Seemed neutral. Car was running smoothly. Tho, I will plug it ...or route it to the airbox? (I'm referring to the hose labled "A" in my first pic)
Btw, does anyone need an air pump (rotated freely, w/o noise)?
Thanks for all your help!!
GlenL, have you ordered those caps for the back? Do you have a p/n?
Mark K, you mentioned to cap of the btm of the airbox. Is it possible to just run a hose from the airbox straight to the piping at the rear of the cam towers?
Sean, I found and plugged that small line.
When I started Chewy... btw, it is amazing how smooth it sounds without the viscous fan running (been deleted). I checked the air pressure (by touch) of the pipe at the rear of the cam tower. There didn't to be any +/- pressure. Seemed neutral. Car was running smoothly. Tho, I will plug it ...or route it to the airbox? (I'm referring to the hose labled "A" in my first pic)
Btw, does anyone need an air pump (rotated freely, w/o noise)?
Thanks for all your help!!
Nordschleife Master
Joined: Jul 2003
Posts: 7,743
Likes: 78
From: Minneapolis
Jim,
I ordered those caps from my favorite Anaheim-based retailer yesterday: P/N900 219 004 02 at $3 apiece.
There is a sealing ring for them too: P/N 900 123 018 30 at $3.80 apiece
I chose to not order the crush rings. I've got a fair collection of rings but may put on some sealant or put them in without anything.
I ordered those caps from my favorite Anaheim-based retailer yesterday: P/N900 219 004 02 at $3 apiece.
There is a sealing ring for them too: P/N 900 123 018 30 at $3.80 apiece
I chose to not order the crush rings. I've got a fair collection of rings but may put on some sealant or put them in without anything.
Addict
Rennlist Member
Rennlist Member
Joined: Oct 2003
Posts: 1,527
Likes: 1
From: N NJ
borland wrote:
What's the life of a catalytic converter without a smog pump installed?
Not very long. The function of the air pump is to pump additional air to the cat converter in order to increase the burning process and heat up the cat. With a cat never at operating temp, it will clog. So remove air pump, remove cat converter == HP!
You'll be amazed how much less heat enters the cabin and engine compartment when the converter is gone.
What's the life of a catalytic converter without a smog pump installed?
Not very long. The function of the air pump is to pump additional air to the cat converter in order to increase the burning process and heat up the cat. With a cat never at operating temp, it will clog. So remove air pump, remove cat converter == HP!
You'll be amazed how much less heat enters the cabin and engine compartment when the converter is gone.
