LT1 smog pump on gen 1 engine
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,876
Likes: 764
From: Sligo PA
LT1 smog pump on gen 1 engine
Okay so I'm trying to figure out a way to make a street legal supercharged 383. I'll be using a remote mount egr fitting. (It's kind of cool it lets you mount an egr on any engine.) So really the only thing I need to figure out is an A.I.R. pump. We have a visual inspection here in PA but not the sniffer test "yet". So my question is can I use an electric smog pump from an LT1 on an older style engine? And if someone could explain to me how the LT1 A.I.R. system works. I know it has valves that open at certain times but I don't know when or why.
Thanks
Thanks
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
the "valves" open much like the valves do on an L98; the difference being that the valves in this case is the electric pump itself.
What I don't know is if adding the LT1 electric pump would be acceptable on an older motor and still pass visual.
What I don't know is if adding the LT1 electric pump would be acceptable on an older motor and still pass visual.
Le Mans Master
Joined: May 2005
Posts: 7,362
Likes: 2,281
From: Central Maryland
I don't have the FSM here to look this up, but to the best of my recollection, the AIR system on the LT1 is triggered by the ECM at startup, runs for either a fixed time or until the system goes closed-loop (IIRC, it's a fixed time), then the voltage to the pump is removed, shutting it down.
You could probably approximate the performance of the LT1's system by connecting the pump's power feed to a timer circuit on your car.
Be well,
SJW
You could probably approximate the performance of the LT1's system by connecting the pump's power feed to a timer circuit on your car.
Be well,
SJW
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,876
Likes: 764
From: Sligo PA
Thanks for the replies. As far as the visual side of it goes I'm not sure either. I know in PA you can swap in a newer style engine and use all the new emissions stuff. This is a newer style block "one piece main" so I'm basically hoping on fast talking the mechanic. 
Also are there problems with letting the pump run all the time?
Also are there problems with letting the pump run all the time?
Le Mans Master
Joined: May 2005
Posts: 7,362
Likes: 2,281
From: Central Maryland
Originally Posted by Phobos84
Thanks for the replies. As far as the visual side of it goes I'm not sure either. I know in PA you can swap in a newer style engine and use all the new emissions stuff. This is a newer style block "one piece main" so I'm basically hoping on fast talking the mechanic.
Could be that what you're proposing is acceptable, thus no need to sweat it when you take the car to the proctologist. If you can get somebody in authority to give you written confirmation that it's legal, you're all set...
Be well,
SJW
Le Mans Master
Joined: May 2005
Posts: 7,362
Likes: 2,281
From: Central Maryland
Originally Posted by Phobos84
Also are there problems with letting the pump run all the time?
Be well,
SJW
