Open Air Cleaner Install on 305 TBI
#1
Open Air Cleaner Install on 305 TBI
This subject has been brought up before, whether or not there are any benefits to changing out the factory air cleaner. I just finished installing the new air cleaner on my 91 RS. The TBI unit is basically a glorified computer controlled, fuel injected carburetor, without the conventional carb. attributes, so tricking it out the "old school" way is easy to do. I needed a new cleaner element anyway, so I decided to go all the way. I did notice a slight boost in performance off the line, but it's more noticeable when dropping it down into passing gear. Not only does the new one look a lot better (I like going for good looks as well as functionality), but you also get a nice throaty "carburetor" sound from under the hood. Sucking in hotter under-hood air might be a little concern, so I left the factory air inlet horn in place to bring in fresh air while cruising. I already had put in a 180 stat, and am also going to make my cooling fan turn on sooner. All in all, I feel the good definitely outweighs the bad with this modification, and I'm pleased with the results.
Here you can see the factory spacer ring that the stock air cleaner base sets on.
Just by simply removing the spacer, you can see how much it opens up air-flow access to
the TBI.
Here is the old air cleaner base in it's stock position. It really makes no sense to me to put a spacer ring on
the TBI unit, and then need to use a drastic drop-down base to compensate for the spacer to allow for hood
clearance. Basically, it's jacked up one way, and dropped back down another way. The incoming air has to go
through a restrictive horn, then up and over the raised center portion of the base, over that raised flange,
and past the two large injector pods to make it's way down the TBI's throat.
Here is the new "flat style" air cleaner base with the spacer ring removed. You can see how
the flow of air has a much easier and straighter path. And there is still plenty of clearance
between the bottom of the air cleaner base and the throttle linkage and distributor.
Close-up shot of the stock base.
Close-up shot of the new base...HUGE difference!
Here you can see the factory spacer ring that the stock air cleaner base sets on.
Just by simply removing the spacer, you can see how much it opens up air-flow access to
the TBI.
Here is the old air cleaner base in it's stock position. It really makes no sense to me to put a spacer ring on
the TBI unit, and then need to use a drastic drop-down base to compensate for the spacer to allow for hood
clearance. Basically, it's jacked up one way, and dropped back down another way. The incoming air has to go
through a restrictive horn, then up and over the raised center portion of the base, over that raised flange,
and past the two large injector pods to make it's way down the TBI's throat.
Here is the new "flat style" air cleaner base with the spacer ring removed. You can see how
the flow of air has a much easier and straighter path. And there is still plenty of clearance
between the bottom of the air cleaner base and the throttle linkage and distributor.
Close-up shot of the stock base.
Close-up shot of the new base...HUGE difference!
Last edited by Camaro 69; 03-19-2012 at 10:14 PM.
#3
RE: Installed a Free Flow Open Air Cleaner 305 TBI
ORIGINAL: 74454bb
nice work... didn't know you had a 3rd gen, next step a 3" K&N and fiberglass cowl hood.
nice work... didn't know you had a 3rd gen, next step a 3" K&N and fiberglass cowl hood.
#6
RE: Installed a Free Flow Open Air Cleaner 305 TBI
I did the same thing by installing an open element intake and I think it was the best thing to do. I like the more throaty noise plus the sucking noise is also cool. And as a bonus mine is only 10" so it cleared up some space in there for me to work. I hated having to take my damned intake pan off everytime I wanted to do something.
#9
Ah okay, yeah that makes sense, thanks I'll get myself a edelbrock chrome breather from advanced, it will go well with my chrome edelbrock air cleaner that I have on there ^.^ I know most people like to retro fit their throttle bodies to fit the single style center hole, I actually drilled 2 holes to maintain the original two hole air cleaner look,
http://s59.photobucket.com/albums/g2...100_2325-1.jpg
There's a picture of mine. I bought the black/red bow tie and closed it up just using a nut and bolt. When I drop the spacer ring I'll put up a picture since I'll be using a taller element to compensate for the space lost by the spacer ring. Thanks for the swift reply by the way!
http://s59.photobucket.com/albums/g2...100_2325-1.jpg
There's a picture of mine. I bought the black/red bow tie and closed it up just using a nut and bolt. When I drop the spacer ring I'll put up a picture since I'll be using a taller element to compensate for the space lost by the spacer ring. Thanks for the swift reply by the way!
#10
Forgive me for reviving a month-old thread, but I'm thinking I might like to do this with my 1991 RS and I have a question. I'm really new to anything dealing with engines, so please bear with me.
I noticed in the stock setup that there is a piece of flexible tubing coming from the exhaust manifold to the air intake path, and there's (I think) a valve to control weather exhaust is being recirculated or not. It's somewhat visible in your forth picture. Did you just cap it off and disconnect the valve? Any adverse effects of doing that? I'd go see for myself, but I'm at school and I left the Camaro at home for the winter.
I noticed in the stock setup that there is a piece of flexible tubing coming from the exhaust manifold to the air intake path, and there's (I think) a valve to control weather exhaust is being recirculated or not. It's somewhat visible in your forth picture. Did you just cap it off and disconnect the valve? Any adverse effects of doing that? I'd go see for myself, but I'm at school and I left the Camaro at home for the winter.
Last edited by Dylan; 02-06-2010 at 09:10 PM.