SMOG TEST
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Joined: Aug 2000
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From: PacNW
SMOG TEST
>I AM FOLLOWING THE HOT ROD MAGAZINE BUILD UP FOR MY RANCHERO
>WHAT WILL I NEED TO GET THIS THINK TO PASS SMOG WITH NEW
>CATS.
Please don't post in all caps. It's very hard to read and it makes it seem like you're yelling.
In order to pass CA emissions it'll have to pass both the visual and "sniffer" tests. You'll notice in the Hot Rod article that they used the stock 2V carb and put on high flow cats because the engine they built was going into a CA vehicle. Just plan on putting all of the emissions equipment back on the vehicle before you take it to be tested.
>WHAT WILL I NEED TO GET THIS THINK TO PASS SMOG WITH NEW
>CATS.
Please don't post in all caps. It's very hard to read and it makes it seem like you're yelling.
In order to pass CA emissions it'll have to pass both the visual and "sniffer" tests. You'll notice in the Hot Rod article that they used the stock 2V carb and put on high flow cats because the engine they built was going into a CA vehicle. Just plan on putting all of the emissions equipment back on the vehicle before you take it to be tested.
Posting Guru
Joined: Jun 2002
Posts: 1,099
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SMOG TEST
I have a 3 page article titled "How to pass a smog test"
I can attach it to an email if you're interested.
Also see,
http://smogsite.com/ectheory.html
http://autorepair.about.com/library/glossary/bldef-168.htm?iam=howstuffworks_SKD&terms=emission+contr ols
I can attach it to an email if you're interested.
Also see,
http://smogsite.com/ectheory.html
http://autorepair.about.com/library/glossary/bldef-168.htm?iam=howstuffworks_SKD&terms=emission+contr ols
Posting Guru
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SMOG TEST
OK, I sent dustinleavitt2000 a couple articles for smog tests but I have a problem with one of the statements made in the 3 page article.
"High-octane fuels and octane boosters may also help a car run cleaner."
I was under the impression that any octane higher than what the engine needs will burn slower and produce higher emissions.
"High-octane fuels and octane boosters may also help a car run cleaner."
I was under the impression that any octane higher than what the engine needs will burn slower and produce higher emissions.
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Posting Guru
Joined: Aug 2000
Posts: 1,127
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From: (near) Denver USA
SMOG TEST
Brian,
High octane fuels do not burn "slower" than low octane fuels. That is a misconception. The high octane fuel is more resistant to spontaneous autoignition (i.e., non-spark-induced detonation) than low octane fuel. Once ignited normally by a spark, the high octane fuel burns at about the same rate as lower octane fuel.
The most common octane enhancers used by oil companies now are the same chemicals used to make oxygenated fuels -- particularly alcohols like methanol and ethanol. Both of those will reduce the CO emissions some, but they have to be present in large quantities (10% or more by volume) to have more than a marginal effect.
High octane fuels do not burn "slower" than low octane fuels. That is a misconception. The high octane fuel is more resistant to spontaneous autoignition (i.e., non-spark-induced detonation) than low octane fuel. Once ignited normally by a spark, the high octane fuel burns at about the same rate as lower octane fuel.
The most common octane enhancers used by oil companies now are the same chemicals used to make oxygenated fuels -- particularly alcohols like methanol and ethanol. Both of those will reduce the CO emissions some, but they have to be present in large quantities (10% or more by volume) to have more than a marginal effect.
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Posting Guru
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SMOG TEST
Does that mean this article is wrong?
http://chemistry.about.com/library/weekly/aabyb100401.htm
Origin of the 'Higher Octane is Better' Concept
The premature ignition made a sound that came to be known as 'engine knock.' When this happened, people would change to the higher octane/slower burning gasoline to resist the premature burn, thus minimizing the knock.
Regular Unleaded Gasoline
All octane grades of all brands of gasoline contain engine cleaning detergent additives to protect against engine deposit build-up. In fact, using a gasoline with too high of an octane rating may cause damage to the emissions system.
http://chemistry.about.com/library/weekly/aabyb100401.htm
Origin of the 'Higher Octane is Better' Concept
The premature ignition made a sound that came to be known as 'engine knock.' When this happened, people would change to the higher octane/slower burning gasoline to resist the premature burn, thus minimizing the knock.
Regular Unleaded Gasoline
All octane grades of all brands of gasoline contain engine cleaning detergent additives to protect against engine deposit build-up. In fact, using a gasoline with too high of an octane rating may cause damage to the emissions system.
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Joined: Aug 2000
Posts: 1,127
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From: (near) Denver USA
SMOG TEST
[updated:LAST EDITED ON 20-Nov-02 AT 04:41 PM (EST)]Brian,
The article you linked on about.com is grossly over-simplified in its explanation of octane and knock (pinging), and in that over-simplification, yes, it is wrong. Unfortunately, it is further riddled with other inaccuracies as well.
Here's an example:
"A carburetor in need of adjustment could cause too much fuel to be mixed with the air ... The excess gas soaked into carbon deposits and caused a premature ignition of the gasoline from the heat of the engine cylinder."
I don't know where they got this idea. With every engine that I've worked on, enriching the mixture has the opposite effect; it reduces pinging.
You can find a much better (more detailed and accurate) explanation of octane and pinging if you follow one of the links at the bottom of that page:
http://www.seansa4page.com/resource/octane.html
Follow the subsequent link to the complete article text at this URL:
http://www.faqs.org/faqs/autos/gasoline-faq/part1/
Here's some relevant content from section 6.3:
"Antiknock ability is _not_ substantially related to ... flame speed of the conventionally ignited mixture.... Although flame speed does play a minor part, there are many other factors that are far more important. ( such as compression ratio, stoichiometry, combustion chamber shape, chemical structure of the fuel, presence of antiknock additives, number and position of spark plugs, turbulence etc.) Flame speed does not correlate with octane."
The article you linked on about.com is grossly over-simplified in its explanation of octane and knock (pinging), and in that over-simplification, yes, it is wrong. Unfortunately, it is further riddled with other inaccuracies as well.
Here's an example:
"A carburetor in need of adjustment could cause too much fuel to be mixed with the air ... The excess gas soaked into carbon deposits and caused a premature ignition of the gasoline from the heat of the engine cylinder."
I don't know where they got this idea. With every engine that I've worked on, enriching the mixture has the opposite effect; it reduces pinging.
You can find a much better (more detailed and accurate) explanation of octane and pinging if you follow one of the links at the bottom of that page:
http://www.seansa4page.com/resource/octane.html
Follow the subsequent link to the complete article text at this URL:
http://www.faqs.org/faqs/autos/gasoline-faq/part1/
Here's some relevant content from section 6.3:
"Antiknock ability is _not_ substantially related to ... flame speed of the conventionally ignited mixture.... Although flame speed does play a minor part, there are many other factors that are far more important. ( such as compression ratio, stoichiometry, combustion chamber shape, chemical structure of the fuel, presence of antiknock additives, number and position of spark plugs, turbulence etc.) Flame speed does not correlate with octane."
