Air injection system removal (?)

I am in the process of removing mine as well, had a burn't valve and think the air injection "may" have contributed so I can get an exemption from licencing to remove so it is going.

I am not sure about the "air pump" you mention as far as I can see the system runs just on vacuum?

See: http://www.eurospares.co.uk/userImages/078/Large/078_008A.gif

Very good description on removal here: http://www.ferrarichat.com/forum/showthread.php?t=192646&highlight=348+thermostat&page=7

 

I've been wondering the same thing for the 96+ 355.

 

Hi All,
I initally my gut tells me to remove the system, weight savings, simplify the engine, ....... But then the voice of wisdom, or maybe many past screwups chimes in, Mr Ferrari put the air system there for good reason, or perhaps our EPA. The exhaust manifold issue is this air injection connection the way I understand it. I do not have one of these beauties in my garage yet, but I'm gonna be pulling the trigger soon. This forum contains much exchange regarding the manifold issue, I would like to hear some discussion of the removal of the air system.
Thanks all,
John G

 

Hi Christopher... I removed mine, because mine rattled a lot and sounded bad. It also added to a messy look to the engine compartment, and also partly covered up the engine. It didn't weigh much, though... just a couple pounds. As far as I'm concerned, the only reason NOT to remove it, is if you have emissions inspections, in which an inspector may see you have your exhaust ports plugged, which may cause them to fail your inspection. For my '92 348 here in Phoenix area, that's not a problem any longer. You are correct that this system only works for a few minutes while the car is warming up. Then it shuts off. Eliminating it eliminates lots of clutter, and lots of vacuum tubing and associated vacuum leak potenial!!

Mine doesn't have an air pump... it's a "surge" system, that apparently counts on differences in intake and exhaust pressure cycles to cause air to flow from the intake to the exhaust. There seem to be some 348s that have pumps, but I'm not sure which years, or how many.

I removed the whole system including vacuum lines. I left the vacuum solenoids (1 on left of induction system and 1 on right by the oil filter), which were bolted on by induction bolts. I didn't want to risk an induction gasket leak, so that's why I didn't remove those bolts to remove the solenoids.

I only found one good source for plugs to plug the exhaust ports on the heads. Hydraulic Fittings Co, 215-744-2828, Philly, P/N 9030M-16X1.5 Metric Plug. They do have a website, but I can't find it at the moment. They are not cheap, but after a lot of searching were about the only good option I could find. They also have a nice land that fits the standard crush washers just right

At first, I just removed the vacuum reservoir, but decided to reinstall it. So my vacuum lines are as follows:

- Line from induction port to vacuum reservoir.
- Line from vacuum reservoir to the solenoid under the induction system for the compensation valve at the front of the induction system.
- Line from the solenoid to the compensation valve.

That's it! See pic of exhaust port plugs below:

Also - be careful under the induction system to make sure your hoses are clear of the throttle cable. This could saw through a vacuum line. I saw this and had to shorten the last vacuum line to the valve which was coming close to the cable.
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My system was set up like the inset drawing, not like the main drawing, but I didn't have any trouble removing the air injection manifolds/tubing without removing the manifolds. But I removed the exhaust manifolds anyway to replace the gaskets and install new nuts, clean the manifolds, and allow easier access for other engine and frame cleaning that I did.

Your picture is actually the on/off valve (1 each side) that allow air to pass to the air manifolds. When the solenoids are activated by the ECUs, (1 each side), the solenoids pass vacuum to those valves to open them to allow air to flow to the manifolds. There are also check valves in the system to prevent exhaust gas backflowing into the induction system. I recommend removing everything except for 3 things.... the black plastic vacuum reservoir mounted on the frame, the solenoid mounted under the induction system used to activate the compensation valve on the front of the induction system, and the compensation valve itself.

I removed everything else, and installed new vacuum tubing, as I mentioned in my previous post. Make sure you remember which port on the reservoir has the vacuum line going to the induction port, and the other will then go to the solenoid under the induction system. If you hook up the reservoir backwards, the reservoir will not work right... I tested it off the car by just pulling a vacuum with my mouth. I forgot that there is a port on the air filter box, but I'll just plug that when I install it. I haven't started my engine yet, but I'm convinced this will work just fine.

 

Reviving a dead thread here but I wanted to ask for clarification on this:

"I recommend removing everything except for 3 things.... the black plastic vacuum reservoir mounted on the frame, the solenoid mounted under the induction system used to activate the compensation valve on the front of the induction system, and the compensation valve itself."

Can you please specify which part numbers in the diagram you're describing so there is no misinterpretation?

 

From what I can gather, you're saying to remove everything except for the black plastic vacuum reservoir mounted on the frame, 12, and 13, and the vacuum hose running in between them. I imagine it's just a matter of capping off all the remaining unused ports after that?

 

I'm removing the air injection off mine as well. Does anyone know the cap size that will fit on the F355 header?

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M24x1.5

read from post 25 onwards (or the whole thread, if you like)

https://www.ferrarichat.com/forum/threads/secondary-air-delete.637752/