502z28

No kidding. Is this physically/stoichemically possible, using dual cats., air pump, a minimizing the carb size or using a EFI ramjet 502 for a BBC application in a IROC?

five7kid

iTrader: (14)

If they open the hood, forget it.

Otherwise, you can probably get it to pass sniffer if you do things along the line of what you say.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
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ATOMonkey

It depends if they are measureing parts per million or grams per mile. If it's ppm then you have a shot. If it's grams per mile I wouldn't be very optomistic. If you lean it out too much to get HC and CO down your NOx will get too high. You could lower compression and lean the enine out and that could possibly pass emissions with a really tiny carb on it. The whole goal is to get the mixture to burn completely, but cool and slow.

[This message has been edited by ATOMonkey (edited November 21, 2001).]

Joshua Leslie

Also you can dump a couple gallons of alcohol in with a full tank of gas...it burns much cleaner.

FstBrd6point3

I understand the whole engine size thing, but my brother has a f*rd 302, and he bombed emissions cuz his third cat was hollowed out. . . so the next week he turned his timing WAAAAY down, and put as much restriction on the intake as he could and he passed with flying colors. . we are from CT where they do parts per million. . it is worth a try

AlkyIROC

As long as the air fuel mixture is burning properly, any size engine can pass an emissions test.

Retard the timing a bit will help. Also put in a 195 thermostat to make it run hotter. A hot engine will have lower emissions.

A good tune up with new plugs etc should also be done.

The air pump only lowers emissions when the engine is warming up by pumping clean air into the exhaust. After the engine is warm, the air pump is just extra baggage.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block (times are for the current engine)

Best ET on a time slip: 11.447 altitude corrected to 10.99
Best MPH on a time slip: 119.42 altitude corrected to 124.86
Altitude corrected rear wheel HP: 493
Best 60 foot: 1.586

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Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

G92Joe

Assuming constant chamber size, would alum heads help with emissions?

Blue502

Depending upon your state, you may be able to do like I did and register your car as a special interest vehicle. In my case it is a permanent registration and I am emissions equipment exempt.

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IROCnRoll.com
'86 Camaro Sport Coupe and '88 IROC

Mkos1980

iTrader: (8)

An EFI 502 like the ram jet with cats smog pump and in good tune will pass fine.

G92Joe

Are there any limitations to registering as a special interest vehicle (i.e.: annual mileage limit, etc.)?

Blue502

Here in Oregon the driving limitation for special interest plates is that the vehicle only be used for shows, parades, club activities, and such. No mileage requirement. Also here the car must be 25 years old or certified as a special interest vehicle by an approved agent. I am sure that every state is different, and some states may not even have a program like this. But I do like the fact that it allows me to do basically any modification to my car that I want, and still be totally legal.