| Author | Message | ||
| '75 308 GT4 (Peter)
|
14.7:1 is called the "Stoichiometric Ratio" and is the ratio where all of the fuel is burned with all of the avaliable air. | ||
| William Masterson (Veloce)
|
I have an 81 2 valve injected and from what I understand the 83QV has the same system - that is without the lamba feedback loop. Is that so? If so - it should be easy to get your car to pass the carbon monoxide portion of the test without an air pump just be leaning the fuel mixture. I don't know what the other test was that they performed it may or may not improve as well with the co adjustment depending on what it was. I have a chart from a book on internal combusion engines which translates air fuel ratios into the percentabe of carbon monoxide and other fuel combusion by-products - it is as follows: Fuel Ratio CO 11 to 1 = 9.14% 12 to 1 = 6.65% 13 to 1 = 4.31% 14 to 1 = 2.09% 15 to 1 = 0.99% 16 to 1 = 0.68% The optimal ratio is considered 14.7 to 1 as far as all emissions is concerned because while co decreases as the mixture leans other byproducts increase. Your car appears to be running a little rich. The air fuel mixture is adjustable on the K jetronic with the use of a long "T handled" allen wrench. There is a small plug which covers an access hole which needs to be removed (and replaced) to do the job. I believe it is showen in the owners manual. It is not hard to do but you do need an accurate air fuel meter. You can always richen it back up after the test but be careful as I understand that running too rich a mixture is a cause of fire with the cats in place as they get hotter, the richer the mixture. Bill | ||
| Randy Ines (Raines)
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You mean they don't pay Ferrari mechanics $1,000 an hour?  Mayberry, R.F.D., Here I come. | ||
| Paul Sloan (Sloan83qv)
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Did they offer you any KY jelly when they gave you that price? I would always try the back woods of NC. | ||
| Randy Ines (Raines)
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Interesting, regarding GM anti-smog parts. Anyway, just brought in to a shop in Raleigh- "Krause & England". They said a lot of stuff was taken off, including mounting parts for air-pump. Nonetheless, it would run me 10 grand to put together. He said my best bet was to find an inspection friendly station in the back woods of NC. Thoughts? | ||
| Warren E. Smith (Magoo)
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Good Tip Paul, I thought that pump looked familiar. | ||
| Paul Sloan (Sloan83qv)
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All anti-smog parts are made by General Motors, the air pump comes from a buick(81 buick Regal)and is availible at any parts house along with the EGR valve. Nick can get you aftermarket cats that will fit. Hope you have the Air pump mounting brackets. | ||
| Warren E. Smith (Magoo)
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RANDY, Do you need cats also? | ||
| Warren E. Smith (Magoo)
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Randy, Check with Nick Scianna at 360-332-7779. If anybodys got one used it will be Nick. | ||
| Randy Ines (Raines)
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David, Failed emissions. Mechanic had me rev up to 2500 rpms and test. Did a visual as well and stated that air-pump & EGR were missing. He couldn't locate cats but passed them anyway. Mechanic said it was blowing 4% carbon monoxide and should be at 1.2%. Also some 400 parts per million, and should be 220 (not sure what). Regardless, I'll have to get these parts and install fast. Any idea on how much this will run me? | ||
| david handa (Davehanda)
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Randy, Is this the "visual" test you failed or actual emission test? The car should pass w/o the airpump connected. Dave | ||
| Randy Ines (Raines)
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Just failed the emissions for NC. If nobody's using their air-pumps and EGRs (especially you Floridians), let me know. I need one in exactly 30 days or face a huge fine. | ||
| Paul Sloan (Sloan83qv)
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83 qv's were the last to use air pumps, 84 and 85 went to a "lamda" type system. | ||
| Herbert Edward Gault (Irfgt)
|
There are two ways to accomplish the air injection. First, by a belt or electrical driven pump and second by what is called Pulse Air Injection. The first type does rob the engine of a few H.P. to run the pump. The second type uses the negative exhaust pressure created in the exhaust manifold to draw in the extra air to complete the combustion of the unburned fuel in the exhaust manifold. It has no real effect on engine power so it's removal would be of no advantage power wise. I believe that 83 and up 308's use the second type system. It is easy to tell. There will or will not be a pump driven off the rear camshaft. | ||
| Steve Magnusson (91tr)
|
Sam -- Unfortunately, I don't know the corresponding air injection design details of the QVs (but I have a vague recollection, from either the FList or maybe one of Tony P.�s FORZA �Shoptalk� columns, that QV air injection evolved significantly from '83 to �85 so the details could be year dependent). There might be some description of the air injection system in the OM, or if you can get the SPC you could probably see if there are any undesirable "obstructions" (e.g., nozzles) anywhere or not. 308QV Owners/Pilota please speak-up! | ||
| Sam NYCFERRARIS (Sam)
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Steve, Any idea if same info/approach applies to air injection on QV's ? | ||
| Steve Magnusson (91tr)
|
I�ve got to agree that removing the cats from a later 308-2V without getting the air injector nozzles out of the cylinder head exhaust ports is a little wacky. Here are the links to jpegs of the related FML article and the original design for anyone interested (sorry Peter -- I still prefer the low hex head): Air Injector Plug design: http://albums.photopoint.com/j/View?u=972829&a=8468088&p=52453107 Page 1: http://albums.photopoint.com/j/View?u=972829&a=8468088&p=52453110 Page 2: http://albums.photopoint.com/j/View?u=972829&a=8468088&p=52453111 Page 3: http://albums.photopoint.com/j/View?u=972829&a=8468088&p=52453112 | ||
| Sam NYCFERRARIS (Sam)
|
You will be inundated with requests so I am placing my order right now...these are the air pump equivilent of test pipes... | ||
| '75 308 GT4 (Peter)
|
The emissions system was removed from my car during the previous ownership. Although they left the air-injectors/manifold still in (and did a pretty horrible job of doing that I might say). One of the items on my engine rebuild were to remove the injectors and plug up the holes. Steve Magnusson here sent me all the info and drawings for the plugs. I had a machinist friend of mine make them for me. Unfortunately Scott, you posted this too late, as I had a second set made and I've sold them already! Here's what mine look like:   | ||
| Warren E. Smith (Magoo)
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So what to worry? If you don't want it on your car take it off. What I mentioned are the only drawbacks. | ||
| Warren E. Smith (Magoo)
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Yeah, Doesn't your AIR pump make a funny noise? I'm sure it does. Just remove the belt and you will see. That's what I refer to as a coffee grinder noise. | ||
| Scott Gold (Scotttgold)
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Coffee grinder noise? | ||
| Scott Gold (Scotttgold)
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No emissions!!!!! YE HAWW!!!! God bless Florida, land where the Horses run unbridled! | ||
| Warren E. Smith (Magoo)
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Also Scott, Removing it probably will affect your emissions test if it is required in your area. | ||
| Warren E. Smith (Magoo)
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Scott, the only problem I see with that is that without the air from the AIR pump the pipes that feed each cylinder at the exhaust deteriorate quicker. Exhaust backs up in them and burns them out. Gaining more horsepower, I don't think so, because that pump doesn't offer that much resistance. But the coffee grinder noise is another thing. Also you probably will notice a richer smell from the exhaust without it. Herb. give me some help here I think I'm correct in my statements. | ||
| Scott Gold (Scotttgold)
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I've been seeing a lot of engine pictures on the web of other 80-82 308 GTSi's without the Air Injection system Is this possible? It looks as if they have taken out the air pump. Is this really necessary? If it gives my car more HP then I'll do it in a second! |