[Diy_efi] Re: Was 1.3l TBI project, now ITB

[John Smith]

Carbs really are not hard to tune at all, easier than EFI even. The trouble 
comes from trying to tune one without a dyno and wideband O2. In the pre-efi 
days, tuning was done by making runs at the drag strip. You jet the carb 
rich and then lean it out until the sparkplugs have tan deposits on them.
If you know what the problem is and what fuel circuit in the carb is 
responsible, it's easy to fix. Just in case anyone is wondering, a good 
carburetor will hold its settings indefinitely; they do not simply go "out 
of tune" by themselves.

Oh yeah, I found an opto interrupter from a photocopier to use as my crank 
trigger for the 555 EFI. I might even go whole-hog with the 10hp Briggs and 
fab up a pressurized oil system. From what I understand, high rpm and high 
power will make a stock Briggs rod go south in a hurry since the slinger 
oiling is adequate at best.

>Message: 4
>Date: Thu, 26 Jan 2006 00:32:09 -0500
>From: "Lee M. Lemoine" <llemoine at gmail.com>
>Subject: Re: [Diy_efi] Re: Was 1.3l TBI project, now ITB
>To: diy_efi at diy-efi.org
>Message-ID:
>	<bedc2dea0601252132l70dcd874gec6acb27e54cc4d8 at mail.gmail.com>
>Content-Type: text/plain; charset="iso-8859-1"
>
>It's funny, my dad has a 262 slant six in one of his trucks..  asked me to
>do a tune on the carb.  I have no friggin clue how to do that.  Yet i've
>done all kinds of EFI stuff, gone as far as making my own crank triggers by
>modifying junkyard parts, etc etc.   yet...  i couldn't tell you how to 
>tune
>a carbeurator.  It's quite interesting.  I guess i'm just part of that 'new
>generation'  that understands fuel injection as a whole, but all that
>'analogue' technology still baffles me.
>
>I'd be the one who'd actually build and use the 555 timer IC type fuel
>injection on my weedwhacker before i'd actually figure out how to fix the
>stupid carbeurator on it.