David,
Thanks! This is specifically the information I was looking for. Unfortunately
your picture didn't come out (I'm on a Sun workstation), but I have a pretty
good idea of where I should tap a vacuum hole. Since the dellorto, and weber
DCOE are virtually identical, your instructions should apply to my setup. I
just
want to make sure that I know exactly where the hole should be placed...
With the plate fully closed, should it be right up against the plate (on the
filter side), or out from it a few millimeters, or is it that critical?? For
this to work properly, I am under the impression that you want to have 'minimum
'vacuum when the throttle plate is fully closed, and have the vacuum increase
the moment the throttle starts to open. There is a hole where the 'choke' lets
in fuel, and I'm wondering if I can tap into that( since the choke never gets
used anyway),but I need to double check to see if that is in front or behind
the
throttle plate. Does that sound like a possibility??, or do you think I'm
better
off just drilling a new hole in the side of the throttle body?
Regards,
Bryan
>
>X-Unix-From: davidr@sunset.net Mon Aug 2 20:10:10 1999
>To: "Bryan Vandiver" <Bryan.Vandiver@eng.sun.com>, <dwramsey@worldnet.att.net>
>Cc: <spridgets@autox.team.net>
>Subject: Re: Timing the 1275 ?
>X-Priority: 3
>X-MSMail-Priority: Normal
>X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2314.1300
>
>This is kinda tough to explain, but I'll try. I have a 40DCOE Weber, and I
>used a very small drill bit to make a hole just to the aircleaner side of
>the throttle plate. I then used liquid solder to glue a vacuum nipple into
>the hole. It is positioned so that there is 0 vacuum at idle, and more as
>the throttle is opened. I a vacuum line up to this and watched on a vacuum
>gauge to make sure it was correct. Seems to work great. Maximum vacuum at
>cruising with no load, vacuum drops under heavy accelleration.
>
>____
> \
>__\__
> |
> drill hole and attatch vacuum line here.
>
>Hope this drawing makes it through e-mail
>
>David Riker
>74 Midget
>63 Falcon
>
>----- Original Message -----
>From: Bryan Vandiver <Bryan.Vandiver@Eng.Sun.COM>
>To: <Bryan.Vandiver@Eng.Sun.COM>; <dwramsey@worldnet.att.net>
>Cc: <spridgets@autox.team.net>
>Sent: Monday, August 02, 1999 12:59 PM
>Subject: Re: Timing the 1275 ?
>,
>> Does anyone out there have any info on modifying a side-draft, for vacuum
>> advance?? It seems like a a properly placed hole drilled through the carb
>body
>> would do the trick, but I don't want to do that unless I'm really sure
>about
>> what to do.
>> At this point I'm not really in the mood to spend a lot of $$ to buy a new
>> mechanical advance distributor. I've poured a lot of time and $$ into this
>> project so far, and it's getting harder for me to justify spending even
>more $$
>> at this point.
>>
>> Regards - Bryan
>>
>> >X-Unix-From: dwramsey@worldnet.att.net Fri Jul 30 21:31:02 1999
>> >X-MSMail-Priority: Normal
>> >X-Priority: 3
>> >To: "Bryan Vandiver" <Bryan.Vandiver@eng.sun.com>
>> >Cc: spridgets@autox.team.net
>> >MIME-Version: 1.0
>> >Subject: Re: Timing the 1275 ?
>> >X-MIME-Autoconverted: from quoted-printable to 8bit by
>triumph.cs.utah.edu id
>> WAA14964
>> >
>> >Bryan, If you used an "offset cam key" the timing mark on the "crank"
>doesn't
>> change. TDC is TDC for the piston not the cam and the piston is connected
>to
>> the crank not the cam. The key is to install the timing cover and crank
>pulley
>> while your dial indicator is still on #1 piston so you can mark TDC. Then
>if
>> you don't have and advance timing light you can also make marks at 10 and
>37
>> deg, I use different colors for each mark. Total advance should occur at
>4K rpm
>> and should be between 36 and 38 deg according to Vizard (as I recall the
>book
>> calls for 34 deg stock). Then you can "speed time" it at 4k and then
>check the
>> timing with a static light so you can R&R the distributor fast if you need
>to
>> later. If you don't have either a advance or regular dynamic light have
>someone
>> else speed time it and then go home and static time it and make your two
>marks
>> on top where you can see them, you can then repeat the setting whenever
>you
>> disturb the distributor. Did I mention that t!
>> >!
>> >!
>> >he points dwell affects the timing but the timing doesn't affect the
>dwell.
>> Thats another story, always check the dwell before the timing.
>> > Crash
>> >
>>
>
>
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