Hi Daniel.
It wasn't Patrick that has the air/fuel ratio monitor. Its me!
The kit came from CB Performance products. Here is a url that may take you
directly there:
http://www.cbperformance.com/catalog.asp?ProductID=598
If not, go to the search box on the main page and enter "ratio". Go down the
list to Carbs and Accessories and Air/Fuel Ratio Monitor.
If you are running headers, the sensor has to go after the point where the tubes
join into one.
Vic Whitmore
76 Spitfire
Thornhill, Ontario
http://www.vicwhit.com
Daniel L Parrott wrote:
>
> Patrick, I am intrigued by the oxygen sensor and fuel/air ratio meters.
> What sensors did you use and where did you mount them?
>
> -----Original Message-----
> From: owner-spitfires@autox.team.net
> [mailto:owner-spitfires@autox.team.net]On Behalf Of Vic Whitmore
> Sent: Tuesday, May 08, 2001 11:55 AM
> To: Bowen, Patrick
> Cc: Spitfires Maillist; pettisw@ms.nidcd.nih.gov
> Subject: Re: Weber DVG venting the crankcase
>
> Drawbacks? None that I know of yet. I took the car out for a "spirited"
> drive
> last night and as I alluded to in the email, the performance was noticeably
> better. Part of this would be attributed to the Weber DGV, part to the
> porting
> and polishing, and part to the new exhaust. If you wanted to see if there
> was a
> performance difference due to the PCV, you could just remove and plug the
> line
> to the manifold and test drive it. Of course, you would have to tolerate the
> oil
> mess while doing it. I doubt you would find any difference as there is
> really
> not that much draw from the crankcase compared to what is coming in through
> the
> carb throat.
>
> The drilling and tapping was pretty straight forward. Since the manifold was
> aluminum, it was easy to work on. I don't advise doing in on the car as the
> metal bits from drilling and tapping will fall into the intake passage. NBD,
> as
> you can vacuum them out if you have to do it this way, though.
>
> As to the PCV valve, I don't recall the specific car but it was a small 4
> cylinder type, probably a Nissan. I just looked through the display at my
> local
> Canadian Tire store and picked one that suited my needs. I'll look for the
> package tonight and let you know which car is was designed for. Maybe I'll
> pull
> the valve out and take a photo of it for the web site too.
>
> As a side note to everyone, you may have noted that I have an aluminum valve
> cover. It has a vented cap on it. Although things seem to be running fine, I
> intend to plug the small vent (about 1/8") as it could lean out the fuel
> mixture.
>
> There were many unknowns in my project as to how everything would work in
> the
> end. I wanted to remove some of the doubts and have some empirical
> measurement
> to base any actions on. So as part of my project, I have installed an oxygen
> sensor and fuel/air ratio meter. Now I can see exactly how things are going
> as I
> drive. At idle, the mixture is rich (good). Cruising at 50 mph runs fairly
> lean
> (good economy). Under acceleration, the mixture goes rich (good
> performance). I
> am amazed (amused?) at how much variation there is in the mixture ratio
> accross
> the driving conditions. It isn't cut and dry 14.7:1 all the time. Trying to
> get
> a steady reading under one condition is difficult unless you can find a long
> flat road for testing. I'll be monitoring this to see if any jetting changes
> are
> required, but it looks good so far.
>
> Vic W.
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