dgb wrote,
>I have adjusted everything. My emissions while in gear are excellent but
>as it sits and idles the car fails.
>
>Twin stromberg 150's on a 1725 in a SV
>The air leak is in the throttle shafts.
>
>They are rebuilt otherwise.
>
>Any suggestions ...for a quick pass.
What did the test fail for, HC, NO or CO, and what were your levels?
I am assuming you failed for CO as you should run lean from your throttle
shaft problem, and not fail for HC.
Setting the engine to 1100 RPM idle will help, as the engine will use more
air, and the ratio of throttled air to the shaft bypass air will increase.
Newer oxigenated fuels allow engines to produce less HCs, use this type
of fuel if you have a choice "only for the test".
Running a 10% mix "max" of dry methanol in otherwise pure gasoline will
yield
similar figures, but the CO2 level will be high. CO2 is not usually
used as a failing criteria, although it may be monitored by the equip.
Also make certain that your distributor timing is properly set, or 1 degree
retarded. This will make the least amount of NO and CO emmisions, while
not affecting HC emmisions. I'd tell you to retard the timing further, but
most states only allow a plus or minus 1 degree leeway on the actual setting
of your timing as seen by the inspector.
-6 BTDC with a 1000 to 1100 RPM idle would be your best bet, if nothing else
were done then that.
BTW, in what location are you located?
Jarrid Gross
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 10:55:19 CDT