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[T3] Dual Carburetors


>>From: Curt Dilday <cdilday@mail.win.org>
>>To: "'oofacts@earthlink.net'" <oofacts@earthlink.net>
>>Subject: RE: [T3] Dual Carburetors
>>Date: Thu, 13 Aug 1998 15:58:08 -0500
>>MIME-Version: 1.0
>>X-MIME-Autoconverted: from quoted-printable to 8bit by
>>stork.prod.itd.earthlink.net id OAA02066
>>Status: U
>>
>>Engine #: U 5022570  (this is definite. I checked it three times)
>>>What year is the car?  Is the fan correct on it?  Is it an automatic or
>>>manual transmission?
>>
>>Distributor #. I finally managed to read the number under the left distrib
>>clamp from under the car. Again, This is definite.
>>Saw This: 0 231170 093 Above this number, not a Bosch #, but: JFU
>>>That is a type 4 distributor, from a 74 1800 automatic bus.  This
>>>distributor has a total advance of probably 36 degrees.  Fine for a type
>>>4 motor but it will destroy a 1600.  If it has a dual vacuum canister
>>>(two hose connections), and the VW # is 021-905-205S, you should get a
>>>different distributor.  I've been trying various vacuum distributor
>>>combinations in my 'back with Weber 34 ict's for some time, so far
>>>nothing's worked as well as a plain old Bosch 009 with Compufire
>>>ignition.  The problem I've been running into is too much vacuum
>>>resulting in too much advance, and it's unsteady at that.  Plus it runs
>>>about 100 degrees hotter with a vacuum distributor.  I haven't tried a
>>>late model beetle vac yet but that's next on the agenda when I can find
>>>one.   I expect that won't work either, but whatthehell.
>>
>>If you have any questions about the distrib. see the Distributor Questions
>>thread on the link. Its all about me and my distributor, and my distributor
>>is not stock.
>>Sorry, I missed all that.  You time the distributor by the distributor,
>>not by the year of the engine.  Muir's type 3 timing information is wrong
>>and the Bentley contradicts itself.  The trick is to ignore what the
>>books say and time it for a total advance of 30 degrees at 3500rpm and
>>let the idle fall where it will.  To do that you need to decipher the
>>timing marks on your fan and make new ones for 20 and 30 degrees.  I did
>>this by finding the 0 and 10 degree marks, cutting a piece of paper the
>>same length as the space between the two marks, then leapfrogging the
>>paper from 10 to 20 and making a mark with a dot of white paint, then
>>doing it again to go to 30.  Then you put your timing gun on, run up the
>>motor till the distributor stops advancing, time it to the 30 mark and
>>there you are.  You can try this with the distributor you've got, I bet
>>the initial timing falls somewhere near 0 if you have the vac advance
>>connected.  If it runs well it might be ok to keep it, but the advance
>>curve will still be wrong and you'll probably run too hot as a result.
>>Personally, I wouldn't keep it.
>>
>>Just tell me, what SHOULD I be idling at?
>>850 rpm?
>>>850-900 is about right for a manual tranny in neutral.  Same for an
>>>automatic, but that's with the transmission in drive, not neutral.
>>
>>Back to my "stories"
>>Curt
>>
>
>


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