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Registered
Join Date: Aug 2005
Location: Colorado Springs
Posts: 78
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air injection system : "upgrades" ???
New owner here ('76 2.0 L). My car has the air injection system : a belt driven pump and hard tubes going to all 4 cylinder heads. I was considering upgrading this system by putting it in a cardboard box in my basement. My main beef with it is that it clutters up an already cluttered area, and I'm probably going to add an aftermarket EFI system w/ an O2 sensor (currently in a cardboard box in my basement).
Does running the engine without the air pump have any adverse effects on the engine ? (It seems like it shouldn't, but I don't want to count on this without asking around.) What is the best way to cap off the air injectors ? (c.f. Haynes book p. 59.) It looks like they are threaded and could just take a screw-on cap : anybody know what size ? As an alternative, can the injectors themselves be removed ? How are they fastened to the engine ? |
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08-15-2005, 09:17 AM
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Registered
Join Date: Nov 1998
Location: antioch, ca, usa
Posts: 1,082
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as long as you don't need the stuff for Smog checks, a cardboard box is a place for it
 the injectors screw into the heads, remove one and find a bolt that'll match the threads (10mm-1.0 I think???) No adverse effects of removing the smog stuff.... what kind of aftermarket EFI? I used to run a megasquirt, now I have a Link ECU.
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'73 914, 1.7, with Boxster transmission in the future? 
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08-15-2005, 10:52 AM
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Join Date: Jun 2003
Location: Fresno, CA
Posts: 7,769
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I don't think there will be any problem with removing the air injection pump (except for passing the smog test - if applicable).
The purpose of the air pump is to inject a shot of relatively cold air behind the exhaust valve. This in turn, causes a secondary explosion of unburned fuel and reduces final emissions out the tail pipe. Last edited by Tidybuoy; 08-17-2005 at 09:07 AM.. |
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08-15-2005, 02:50 PM
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Registered
Join Date: Aug 2005
Location: Colorado Springs
Posts: 78
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Mike,
The EFI is From Simple Digital Systems (SDS). I bought it years ago for another project. That project was never finished, so it's been sitting in a box. Don't think I'll do it right away (plenty of other little fixes to take care of...) Jeff |
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08-16-2005, 12:15 PM
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Registered
Join Date: Aug 2005
Location: Colorado Springs
Posts: 78
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Okay, got the octopus off my head(s). I left the injectors in place and plugged them w/ #10 stainless screws; don't know if they bit into metal or carbon buildup, but they seem to make a pretty firm seal.
Don't know exactly how much difference this made, 'cause I did several tweaks at once. But altogether, the car's definitely got more pep. |
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08-18-2005, 02:59 PM
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