Are 347 & 393 strokers emissions legal??

Stang_ROTY · 05-07-2001, 08:58 PM

In about a month I'll be pulling up to the emissions dyno with a 393 stroker underneath a 93GT. I'm using BBK 2 1/2" Cats w/ BBK shorties, a smog pump, EFI w/ 30lb injectors & 70mm TB. Also, I plan on getting the test code tool for the computer and a chip to help the 30lb injectors run lean. I know it can be done in the magazines as proof is the emerald green cover car on a recent MM&FF issue. Has anyone had any first-hand experience passing strokers on emissions dynos? I figure if the 347 passes than there is no reason why the 393 wouldn't.

------------------
In progress for Spring:

93 GT less motor and tranny, 8 pt cage, chute,
Sothside Machine bars & Sub-frames, 3.73's
'69 393 stroker Edlebrock Performer heads, Performer RPM Upper & Lower Manifold..Crane Gold 1.6 Rollers..BBK 70MM TB & cats..30lb Injectors..Cartech Fuel System..

jimberg · 05-07-2001, 09:45 PM

By putting it on the dyno, I'm assuming that they test for NOx in MA, so I would suggest that you not run lean. Running lean means running hotter. Running hotter increases NOx emissions which may lead to failure. Just make sure your car is tuned up and timing is stock. Make sure that the EGR and air pump is working. Go in assuming you'll pass. I wouldn't invest a lot at this point in trying to pass. If you fail, figure out where you failed and fix it, but I wouldn't sweat it at this point.

Your plan to run it lean is a good example of fixing one thing and breaking another in anticipation of something that may not even be a problem. You may reduce CO and HC emissions but increase NOx emissions in the process.

Disregard this message if they condemn your car and impound it upon failure in MA. My state would just tell you what the likely problem is, have you fix it, and then test again. Fortunately we don't do testing anymore.

------------------
351W 89 Mustang GT Convertible

screaming_pas$enger88 · 05-08-2001, 11:21 AM

ive seen stuff from the parts store that "supposedly" helps you pass emissions. use some of that or some octane booster and give it a good run up and down the highway a few miles then bring it in. thats what my buddy did. his 88 has no cats and well over 200,000 miles on it and he passed. that was before our wonderfull new inpection though.....give it a try anyway and good luck!!!!!

------------------
AIM= OneQuickStang

DirtKing · 05-08-2001, 11:55 AM

go in on a hot day after letting the cats get good and hot. do not can on it before testing! putting 10 miles on in 4th gear at 60-65mpg should do the trick. try to pull in without waiting as your cats will cool down. the less idle time the better.

------------------
88LX notch, Speedpro EFI Procharged!

dinomite · 05-08-2001, 05:06 PM

DirtKing has a good point, make sure that the cats are good and hot when you go in. If you fail, pull an injector before you go back.

Stang_ROTY · 05-08-2001, 07:17 PM

Thanks alot for the tips guys! I appreciate the advice. I'll make sure she's good and hot before I bring her in. Any ideas where I could get a new smog pump? My Uncle has one from a 85 Crown Vic Police car but it's a little sticky. Also, I wasn't aware that running lean meant running hotter. I read that it meant that your air/fuel ratio was more air than fuel and vice versa for running rich. In MA they won't take the car for failing or anything like that. I actually read into the law and if I spend over $300 in "repairs" than there is a possibility that I can get a waiver for life. I can't imagine that I would be running high emissions with all brand new parts and a mild cam similar to E-303...but you never know.
Thanx again

------------------
In progress for Spring:

93 GT less motor and tranny, 8 pt cage, chute,
Sothside Machine bars & Sub-frames, 3.73's
'69 393 stroker Edlebrock Performer heads, Performer RPM Upper & Lower Manifold..Crane Gold 1.6 Rollers..BBK 70MM TB & cats..30lb Injectors..Cartech Fuel System..

jimberg · 05-08-2001, 08:18 PM

I was being a bit facetious about them taking the car. My point was that failure isn't a big deal so don't invest a lot of money trying to pass. Wait until you fail to do anything, and if you don't fail, you haven't wasted anything.

Yes, running lean generates more heat. This is why you can get more power running on the rich side. Since the combustion chamber temp is kept down, you can actually squeeze more air into the cylinder. Water injection does the same thing but without generating the extra HC in the exhaust.

Your best bet is to keep with the stock settings of the computer and don't try to tweak anything. The other tip about making sure your cats are hot before the test is a good one. Since it appears that you don't have an air pump, that could mean trouble. The cats need oxygen to catylize. Without it, they won't work as efficiently and could lead to failing the test. Get one from someplace like www.stangparts.com or even a local wrecker.

------------------
351W 89 Mustang GT Convertible

05-07-2001, 08:58 PM	#1
Stang_ROTY Registered Member Join Date: Feb 2001 Location: Berkshire County - Massachusetts Posts: 735	Are 347 & 393 strokers emissions legal?? In about a month I'll be pulling up to the emissions dyno with a 393 stroker underneath a 93GT. I'm using BBK 2 1/2" Cats w/ BBK shorties, a smog pump, EFI w/ 30lb injectors & 70mm TB. Also, I plan on getting the test code tool for the computer and a chip to help the 30lb injectors run lean. I know it can be done in the magazines as proof is the emerald green cover car on a recent MM&FF issue. Has anyone had any first-hand experience passing strokers on emissions dynos? I figure if the 347 passes than there is no reason why the 393 wouldn't. ------------------ In progress for Spring: 93 GT less motor and tranny, 8 pt cage, chute, Sothside Machine bars & Sub-frames, 3.73's '69 393 stroker Edlebrock Performer heads, Performer RPM Upper & Lower Manifold..Crane Gold 1.6 Rollers..BBK 70MM TB & cats..30lb Injectors..Cartech Fuel System..

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05-07-2001, 09:45 PM	#2
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	By putting it on the dyno, I'm assuming that they test for NOx in MA, so I would suggest that you not run lean. Running lean means running hotter. Running hotter increases NOx emissions which may lead to failure. Just make sure your car is tuned up and timing is stock. Make sure that the EGR and air pump is working. Go in assuming you'll pass. I wouldn't invest a lot at this point in trying to pass. If you fail, figure out where you failed and fix it, but I wouldn't sweat it at this point. Your plan to run it lean is a good example of fixing one thing and breaking another in anticipation of something that may not even be a problem. You may reduce CO and HC emissions but increase NOx emissions in the process. Disregard this message if they condemn your car and impound it upon failure in MA. My state would just tell you what the likely problem is, have you fix it, and then test again. Fortunately we don't do testing anymore. ------------------ 351W 89 Mustang GT Convertible

05-08-2001, 11:21 AM	#3
screaming_pas$enger88 Registered Member Join Date: Apr 2001 Location: Massachusetts Posts: 35	ive seen stuff from the parts store that "supposedly" helps you pass emissions. use some of that or some octane booster and give it a good run up and down the highway a few miles then bring it in. thats what my buddy did. his 88 has no cats and well over 200,000 miles on it and he passed. that was before our wonderfull new inpection though.....give it a try anyway and good luck!!!!! ------------------ AIM= OneQuickStang

05-08-2001, 11:55 AM	#4
DirtKing Registered Member Join Date: Feb 1999 Location: brooklyn center,mn,USA Posts: 169	go in on a hot day after letting the cats get good and hot. do not can on it before testing! putting 10 miles on in 4th gear at 60-65mpg should do the trick. try to pull in without waiting as your cats will cool down. the less idle time the better. ------------------ 88LX notch, Speedpro EFI Procharged!

05-08-2001, 05:06 PM	#5
dinomite The Dude Join Date: Feb 2001 Location: Arlington, VA Posts: 1,262	DirtKing has a good point, make sure that the cats are good and hot when you go in. If you fail, pull an injector before you go back.

05-08-2001, 07:17 PM	#6
Stang_ROTY Registered Member Join Date: Feb 2001 Location: Berkshire County - Massachusetts Posts: 735	Thanks alot for the tips guys! I appreciate the advice. I'll make sure she's good and hot before I bring her in. Any ideas where I could get a new smog pump? My Uncle has one from a 85 Crown Vic Police car but it's a little sticky. Also, I wasn't aware that running lean meant running hotter. I read that it meant that your air/fuel ratio was more air than fuel and vice versa for running rich. In MA they won't take the car for failing or anything like that. I actually read into the law and if I spend over $300 in "repairs" than there is a possibility that I can get a waiver for life. I can't imagine that I would be running high emissions with all brand new parts and a mild cam similar to E-303...but you never know. Thanx again ------------------ In progress for Spring: 93 GT less motor and tranny, 8 pt cage, chute, Sothside Machine bars & Sub-frames, 3.73's '69 393 stroker Edlebrock Performer heads, Performer RPM Upper & Lower Manifold..Crane Gold 1.6 Rollers..BBK 70MM TB & cats..30lb Injectors..Cartech Fuel System..

05-08-2001, 08:18 PM	#7
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	I was being a bit facetious about them taking the car. My point was that failure isn't a big deal so don't invest a lot of money trying to pass. Wait until you fail to do anything, and if you don't fail, you haven't wasted anything. Yes, running lean generates more heat. This is why you can get more power running on the rich side. Since the combustion chamber temp is kept down, you can actually squeeze more air into the cylinder. Water injection does the same thing but without generating the extra HC in the exhaust. Your best bet is to keep with the stock settings of the computer and don't try to tweak anything. The other tip about making sure your cats are hot before the test is a good one. Since it appears that you don't have an air pump, that could mean trouble. The cats need oxygen to catylize. Without it, they won't work as efficiently and could lead to failing the test. Get one from someplace like www.stangparts.com or even a local wrecker. ------------------ 351W 89 Mustang GT Convertible