Mixture question

[jdbubb at verizon.net (Dan Bubb)]

It's long been my understanding that adjusting the mixture on CIS
mostly affects idle and has less and less of an effect as the fuel
metering plate moves higher.
At least that's what my engineering sense tells me.
So.....that means you'll have virtually no effect on cruising or WOT
mixture if you're idle mixture is in the range where the engine will
actually idle.
Anyway, I'd set the idle a tad rich from stoichiometric. Most engines
like to idle a little on the rich side.
But, I am curious if adjusting the idle has any effect on cruise or
WOT AFRs?????
Dan
who would have responded long ago if I'd have noticed your original
post and WB-O2 content ;^)


From: "Brian McGarvey" <bmcgarvey@gmail.com>
Sent: Monday, May 22, 2006 9:43 PM
Subject: Re: Mixture question


Because I didnt know all the facts.. You said 8v @ 10.1:1 compression I
immedialty assumed non-stock or 2.0l aba. I can confirm the small 8v
(1.7EN) CIS-Lambda will run an 11:1
2.0L aba -- although not well the JH CIS fuel dizzy and armature works much
better doesnt knock at WOT... or hot days.

But the basic thought was VW in the 70's and 80's was worried about long
lasting cars and pretty good fuel mileage. so running lean at load would be
seemingly a bad idea. I was assuming you were not getting enough fuel at
load...

and since your running CIS ( no lambda correction ) and knock box ( ign
retard on knock) you are running a non-factory option setup. IIRC...

Rich at idle + stoich else is ok. afaik...

see you in a couple days..
Bigmac


On 5/21/06, C Boyko <roccit_53@scirocco.cs.uoguelph.ca> wrote:
>
> On 7:17:22 pm 05/21/06 "Brian McGarvey" <bmcgarvey@gmail.com> wrote:
> > Cathy,
> > Check your fuel pressure..or you may need to upgrade to larger FIs or
> > a bigger fuel dizzy..
> > bigmac
> >
> ?????? It's a 1.8 dizzy, and the engine's a 1.8. And pressure's wonderful,
> top of the spec. (new pump). But I want to dial in the mix, and wondered
> if
> rich at idle's okay if it's at stioch otherwise. Vaccuum changes at idle,
> so I'd assume mix does also. I haven't touched the mixture screw on the
> dizzy at all at this point. So, why are you suggesting an equipment issue
> here? Just curious, I'm sure there's room to richen it, I doubt it's
> topped
> out or anything.
> cathy
>
>
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