 emission failure - add cat ?, lets say ... |
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| jimkelly |
 Apr 20 2009, 03:24 PM
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Delaware USA  Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region  |
you fabbed up a set of he's thru a cat and then thru a muffler.
hypothetical - if the exhaust read 700 HC & 7.00 CO - what woud it read with cat? jim Attached image(s) 
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| drive-ability |
Apr 20 2009, 05:31 PM
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Senior Member Group: Members Posts: 1,169 Joined: 18-March 05 From: Orange County, California Member No.: 3,782 |
Oops read the post first
I would lean out the idle system just a bit and retard the timing. That should lower the CO a bit and keep the HC from climbing. Its all a crap shot. Adding a cat would get you to pass ether way... IMO ... |
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| Cap'n Krusty |
Apr 20 2009, 05:38 PM
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
QUOTE(drive-ability @ Apr 20 2009, 04:31 PM)  Looking at those readings I would retard the timing a bunch and you should be OK. HST, I'm assuming you didn't have the timing checked during the test , thus won't be flagged for moving it around a bit.. I had a Ca. test and repair (emission testing) license for 25 years and did see reductions in HC when installing new cats, true its not as effective but does reduce the number. I think moving the timing (ATDC) would do it.. And what's he gonna do about the CO? If he gets the CO down to below the limit for a '72, it's reasonable to assume the HCs will fall as well ................. Besides, the timing is specified, and if he doesn't fall within a degree or 2 of the specification, it's gonna fail. The Cap'n |
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| drive-ability |
Apr 20 2009, 05:51 PM
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#4
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Senior Member Group: Members Posts: 1,169 Joined: 18-March 05 From: Orange County, California Member No.: 3,782 |
QUOTE(Cap'n Krusty @ Apr 20 2009, 04:38 PM) QUOTE(drive-ability @ Apr 20 2009, 04:31 PM) Looking at those readings I would retard the timing a bunch and you should be OK. HST, I'm assuming you didn't have the timing checked during the test , thus won't be flagged for moving it around a bit.. I had a Ca. test and repair (emission testing) license for 25 years and did see reductions in HC when installing new cats, true its not as effective but does reduce the number. I think moving the timing (ATDC) would do it.. And what's he gonna do about the CO? If he gets the CO down to below the limit for a '72, it's reasonable to assume the HCs will fall as well ................. Besides, the timing is specified, and if he doesn't fall within a degree or 2 of the specification, it's gonna fail. The Cap'n It all depends on the testing criteria and If he check the timing. Lots of guys say they did and don't |
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Posts in this topic
jimkelly emission failure - add cat ? Apr 20 2009, 03:24 PM
Cap'n Krusty The cat is unlikely to get the CO down, but it wou... Apr 20 2009, 04:25 PM orange914 i'd expect the high h.c.'s are high due to... Apr 20 2009, 05:59 PM
Drums66 the air cooled engines i've smogged have to be... Apr 21 2009, 01:39 PM john rogers I see you are in Milton DE, just south of where I ... Apr 20 2009, 06:24 PM type47 This is for your V8 powered 914, right?
Antique t... Apr 21 2009, 06:50 AM jimkelly delaware is 1968 and older : (
looks like i need ... Apr 21 2009, 09:20 AM drive-ability
delaware is 1968 and older : (
looks like i need... Apr 21 2009, 10:32 AM type47
subaru power would be better for the environment... Apr 21 2009, 11:09 AM Cap'n Krusty Or you could just do a tuneup ....................... Apr 21 2009, 09:31 AM jimkelly a tune up - i am not looking for a common sense so... Apr 21 2009, 06:02 PM Cap'n Krusty
a tune up - i am not looking for a common sense s... Apr 24 2009, 01:57 PM charliew Or go to fi. even tb fi. you probably wouldn't... Apr 21 2009, 10:14 AM type2man If you're looking to pass a smog test, disconn... Apr 21 2009, 06:27 PM jcd914 I know I am jumping in late on this but I don... Apr 24 2009, 12:33 AM r_towle Jim....alcohol...in the car, not you.
Less than a ... Apr 24 2009, 06:34 AM DBCooper Uh oh, you just revealed The Secret. Ignore that ... Apr 24 2009, 06:58 AM r_towle Yes the fill up is key...you gotta dillute it fast... Apr 24 2009, 08:45 AM Dr. Roger hey jim,
find a friend with an infra-red meter (s... Apr 24 2009, 12:46 PM |
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