Do they run a fan into the front of the car to simulate road conditions?
Most dynotesting you see on the TV they have a giant fan to simulate the
air flow and keep overheating from happening. Fresh oil change helps
emission testing for me.
Dave
Glen Byrns wrote:
>Gerard,
>
>Overheating will definitely raise the NO component of the exhaust. Anything
>that lowers the combustion temperature will reduce the NOx output. Problem
>is that they have to "warm the car up to operating temperature" before
>performing the checks. An ethanol rich fuel should help, anything you can
>think of to lower the compression ratio will help the NO, but hurt the
>hydrocarbon emissions. If your cat conv. is in good shape, you could handle
>the additional HCs created as you try to drop the NO. They are supposed to
>verify that the timing is "in range", so that rules out the old trick of
>retarding the timing for the day of test and putting it right back when you
>get home. You should, however, be sure that it is set at the lowest
>allowable amount of advance when you are tested. I took a class on all this
>stuff 30 years ago, but now three of my four cars are EXEMPT. I may switch
>the Austin over to bituminous coal just for a giggle.
>
>Glen
>
>
>
>>Well, time for my biennial SMOG check here in Kalifornia. If you
>>don't already know, last year they implemented a dyno into the
>>process and added NO gasses to the test. All my other reading were
>>extremely low, but I failed on NO (PPM) max at 15 MPH is 791 and I
>>read 965, at 25, max is 730 and I read 908. The odd thing is my car
>>overheated in the process (which it has not done in two years, ever,
>>and I'm wondering of that could cause the problem. If not, does
>>anyone know what needs to be corrected to drop this number?
>>
>>Thanks for any help.
>>
>>Gerard
>>--
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