Steve Wickland wrote:
>
> 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.
Thanks for the compliment!
As for sensor placement, since we are only using the sensor as a visual
guide, it doesn't need to be hot all the time...if it cools off, you
just lose your reading, and get it back as soon as you get under way
again.
The photo of the sensor installation on the page is after the header
collector on my 4 cylinder Pinto. Even that far back, it only cools off
if you shut the engine off.
The reason for heated sensors is to prevent a feedback car from going
open loop, hence full rich on the computer output.
I don't recommend heated sensors because of the extra wiring involved,
and their increased cost.
As far as wrapping headers, ask anyone who's had to buy a new set of
headers after trying this...my brother wrapped the headers on his 454
Chevy pickup, and they lasted two months. The wrap traps heat and
moisture and just corrodes regular headers almost immediately.
I recommend putting the sensor after your headers in th exhaust pipe,
since the exhaust pipes are cheaper, and often can be dropped down for
easier welding.
Gerard
65 MkI
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