[Spridgets] Weber Conversion

[derf]

My biggest dislike with the side draft Webers was the lack of a good vacuum
source for the dizzy.  They are good carbs, though.
Forgot to mention that I tinkered with some Dellortos, too.  I don't
remember there being much difference but I didn't race or dyno anything.


On Thu, Apr 26, 2018 at 7:31 AM, Ron Soave via Spridgets <
spridgets at autox.team.net> wrote:

> To be clear,, I use both. My street Bugeye and street Midget (bone stock)
> use SUs at the moment. My race car uses both as things dictate. The
> throttle shafts wear quickly on the SUs under race conditions, and they are
> more susceptible to fuel frothing in the float bowls, which is a pain. My
> last dyno runs were 3 weeks ago, and I eeked out 3 more hp with the weber.
> Last year, slightly HIGHER compression ratio, I got 2 more with the SUs.
> They are both great carbs when set up right. My weber was bought from the
> late great Skip at Shadetree motors in 1997. It is used pretty severely and
> is as new. You can’t kill ‘em.
>
> 28 and 30 mm chokes — I use 36 mm chokes on street, 40mm on race. Brake
> specific fuel consumption showed less than those numbers clamped
> performance. Your results may vary, and that’s the fun of it. I LOVE the
> Weber sound (sometimes), and have a set of triples on the TR6 I am getting
> around to restoring.
>
> Ron Soave
>
> > On Apr 26, 2018, at 5:44 AM, Mark J Bradakis via Spridgets <
> spridgets at autox.team.net> wrote:
> >
> >> On 04/25/2018 06:51 AM, John Farley via Spridgets wrote:
> >> Hi folks.  I am toying with the idea of going to a Weber carb in place
> of the
> >> HS 2s in my Bugeye.  The engine is a pretty much stock 1275 (1302).  I
> am thinking about a 40 DCOE or 45 DCOE?  Any words of wisdom from the group
> relative to the type, tuning tips, etc.?
> >> Thanks,
> >> John F.
> >
> > A lot of people swap out their old, dirty, worn out SUs for a brand new
> shiny Weber.  And they see major improvement in performance.  If they
> swapped out a dirty, old worn out Weber for brand new shiny SUs  they would
> probably see a major improvement in performance as well.
> >
> > Properly maintained and adjusted SUs work quite well.  But if you want
> to spend the money for the wow factor, stick with a 40 DCOE. 45 is too big,
> needs to be really choked down for a 1275.  A 40 with 28 - 30 mm chokes
> will work with a standard exhaust.  What you stuff in has to be matched
> with what you let out.  A nice LCB header will complement the increased
> breathability of the Weber.
> >
> > Too bad I didn't keep notes, back 10, 12 years ago when I was working at
> Bailey's we had a customer with a 1275 Bugeye who was very happy with the
> configuration of the 40 DCOE I set up for him. At 4200 hundred feet above
> sea level the optimal jetting will be a bit different than at sea level.
> Still have a little plastic tackle box out in the garage that has maybe
> $1000 - $1500 of precisely machined brass bits in it.
> >
> > mjb.
> >
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