Chevy 5.7 Liter Conversion - To Smog/Air Pump or No? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 08-15-2009, 04:29 PM Thread Starter
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Chevy 5.7 Liter Conversion - To Smog/Air Pump or No?

Greetings and thanks in advance.

I poster this on the Pirate site in the Chevy forum but wanted to throw this on the Jeepster site too.

I have transplanted a 5.7 liter V8 from a 1988 Chevrolet Suburban to my 1968 Jeepster. I converted it to a single serpentine belt, minus the air/smog pump. Everything else is stock. All new single exhaust with a new catalytic converter.

From the reading and searching I have done on the air/smog pump it indicates to me that the primary role of the smog pump is during start-up when the engine and cat are heating up to improve the efficiency of the cat. I have read some comments that without the pump the cat can become clogged. I have also read that new generation cats are much more efficient than old generations and I would assume the 1988 Suburban falls into the "old cat" category. My Jeepster does not require smog inspection.

Is the above accurate or inaccurate?

Pros/Cons to the smog/air pump?

If no air pump, any idea what size plugs for the exhaust manifolds and where to get them ?

Thanks.

Jeepsternut
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post #2 of (permalink) Old 08-17-2009, 09:50 PM
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why do you want to run a smog pump or converter? Does your state require it for that old of a vehicle?
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post #3 of (permalink) Old 08-18-2009, 01:01 PM
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from what i understand you should be fine with removing the smog pump.

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post #4 of (permalink) Old 08-29-2009, 01:04 AM Thread Starter
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Hi. The vehicle is in California. No smog required but I am very interested in keeping the fumes to a minimum so I had a cat installed with the new exhaust. I was concerned that the 5.7 from a 1988 Chevrolet Suburban, which had a smog pump, would ruin the cat. But upon further feedback and research, I decided to skip the pump.

I removed the stainess air pump tubing and welded the threaded ends up to make a plug.

pictures posted To Smog/Air Pump or No? - Pirate4x4.Com Bulletin Board
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post #5 of (permalink) Old 08-29-2009, 02:20 AM
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Hi Duane:

Long time. I'm running a new GM HT383E with '99 Yukon EFI and no pump or cat. I hope your floorboard temp doesn't get out of hand with the cat. Sure wish we could buy those space shuttle tiles cheap to keep the heat out, as the heat shields available from places like Summit aren't as good as I'd like. Pics look good.

Tim
'66 Jeepster Commando w/GM HT383E/4L60E/Atlas II/D-60F & D-70R
'70 Wagoneer w/Buick 350 V-8
'73 J4000 w/GM L31/700R4/NP-205/D-44F/GM 14 Bolt
http://jonesys.com/project_detail.php?id=170
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post #6 of (permalink) Old 08-29-2009, 08:44 PM Thread Starter
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Long time indeed.

Havent driven it yet so unknown how bad the floor temp will be. The floor used to get pretty warm with the v6/th400.. The Jeepster is in pieces since I stripped it down for paint. Slowly putting it back together.

I should post some pics of the paint work and engine install/placement.

Duane

1968 Jeepster, Ford 9, Dana 44, 5.89's, ARB's, 35's, RamseyPTO, 4xDisk-Hydroassist PB. In Process SBC350, 700R4
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