Hi Steve, and Listers,
The convention is to put the oxygen sensor at the collector in order to get an
average reading of the mixture. However, as we talked about a little at SUNI,
the temperature may not be sufficient down there for the oxygen sensor to work
well except if you're doing sustained high-output runs. I think that either a
heated oxygen sensor or else wrapping the header primaries in that header-wrap
ceramic insulation, or both, would help the oxygen sensor to work.
My other car is an '85 Corolla GT-S with the 16-valve engine; the stock oxygen
sensor location is at the base of the cast-iron exhaust manifold. For a few
years I ran the car with a header, with the oxygen sensor located at the
collector, and I found that the gas mileage dropped about 10-15% with the header
installed, presumably due to the oxygen sensor not getting hot enough to give a
proper mixture indication. I certainly didn't change my driving style 10%.
Theo Smit
tsmit@home.com
tsmit@novatel.ca
B382002705
> -----Original Message-----
> From: Steve Wickland [SMTP:wickland@poseidontech.com]
> Sent: Thursday, August 05, 1999 12:05 PM
> To: tigers
> Subject: Jetting with an Oxygen Sensor
>
> Hello All,
> I read Gerard's page on Holley jetting and must say
> that it is a very well written piece. I really like the
> idea of using an oxygen sensor to get concrete
> feedback. I was wondering how many folks on
> the list have done this? Where did you put the
> O2 sensor if you have headers? It seems to me
> that I would have to use a sensor with a heater
> because it would be hard to get close enough to
> the exhaust valve.
>
> Steve W.
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