[Roadsters] OT: daily driver smog check results, suggestions for next year

[Bubba]

Don't forget a clean air filter!

Bob Winslade
1966-1600 Missy
1967-1600 Bender


----- Original Message ----- 
From: "Stephen Wan" <steve at olsonarchitect.com>
To: "O'Farrell, Fergus" <Fergus.OFarrell at ngc.com>; 
<datsun-roadsters at autox.team.net>
Sent: Wednesday, April 23, 2008 12:20 PM
Subject: Re: [Roadsters] OT: daily driver smog check results, suggestions 
for next year


> Fergus,
> HC and NO are usually inversely related.  If one goes up, the other goes
> down.
> High HC is usually caused by running rich.  High NO is usually caused by
> high combustion temperatures; advanced timing, running lean, etc.
> This suggests that you are not getting a complete burn. Especially when it
> cleans up at higher RPM's when timing isn't as crucial.
> I'd change the plugs, cap and rotor and check the wires before your next
> smog check.
>
> Steve
> 70' 1600
>
> ----- Original Message ----- 
> From: "O'Farrell, Fergus" <Fergus.OFarrell at ngc.com>
> To: <datsun-roadsters at autox.team.net>
> Sent: Wednesday, April 23, 2008 7:54 AM
> Subject: [Roadsters] OT: daily driver smog check results,suggestions for
> next year
>
>
>> Okay engine exhaust gas experts, I took my car in for a CA smog check
>> yesterday (meaning they put it on a dyno and run it at 15mph and 25mph),
>> and figured it'd pass no problem, so while I due religious regular
>> maintenance, it does have 102k miles and I haven't changed the plugs in
>> 3 years or so. (~45k miles)
>> Brand new air filter.    Toyota Tacoma 3.4L V-6 (5GZFE engine, from
>> memory), auto trans, 2wd, 4 door (like that makes a difference).
>>
>> So here is what I got for results:  (it passed, but a few were "by a
>> hair", see below)
>>
>> 15mph, 1729 rpm:   %CO2:  15.0,  %02: 0.0
>> 25mph,  1751 rpm:  %CO2:  15.1,  %02:  0.0
>>
>> And the 3 tested (pass/fail) readings
>> Measured------- Average for Passing Vehicles----------Max Allowed
>>
>> HC (ppm):
>> 15mph:    47------4-------51  (**)
>> 25mph:   19-------4-------35
>> CO (%):
>> 15mph:  0.14-----0.00------0.65
>> 25mph: 0.02------0.01------0.79
>> NO (ppm):
>> 15mph:  510-------18-------512  (**)
>> 25mph:  168-------16-------765
>>
>> The two with asterisks are the ones I am most concerned about.  Any
>> suggestions on what to do for next test (reg for 2010)?
>>
>> Note: on a sideline, on the recent Iron Bottom, I met someone who was
>> driving a '79 stock midget, and when I asked him about smog, he said
>> he'd get "the new additive from CRC that nearly guarantees passing
>> numbers".  He intimated it was like "solvent in a can", not sure, never
>> heard of it, but thought I would throw it out there as an idea /
>> research opportunity for those who have one "on the edge".
>>
>> Thanks for the help, looking forward to seeing y'all in Solvang,
>> Fergus O, 69 2000, HB, CA
> ________________________________________
> Support Team.Net  http://www.team.net/donate.html
>
> You are subscribed as bubwin at mts.net
>
> Datsun-roadsters mailing list
>
> http://www.team.net/archive
>
> http://autox.team.net/mailman/listinfo/datsun-roadsters