[DeTomaso] Demon Carb Feedback Wanted

Wed May 7 12:38:02 EDT 2008

I finally made a decision on a new carb and ordered one from Quick Fuel
Technology
to specs they devised from a laundry list of questions regarding the motor,
use, etc.

It should be here in a week or so ( they are built to order ) and I'll
report as soon as it is installed.  It will use the same linkage, lines etc.
( the Demon required all new stuff ) and it does have an electrical choke so
my warm up issues should be cured as well.

Thanks to all who offered input and advice.

Michael in Savannah

I will of course do another series for the website (
www.michaelspantera.com) on R & R the carb, etc.

On Tue, May 6, 2008 at 1:34 PM, Daniel C Jones <daniel.c.jones2 at gmail.com>
wrote:

> > Any users of this thing out there?
>
> Demon carbs seem to suffer from quality control problems.  Lots of
> stories of people unable to get new Demon carbs to behave.  When they
> disassemble them, the float bowls have shop grit in them.  That said,
> I've driven Demon equipped engines similar to yours that ran great.
>
> >From the photo I don't see an electric choke, so how's that work?
>
> The idle circuit and accelerator pump are sufficiently rich that you can
> usually get it to fire without a choke, at least in moderate weather.
> You'll have to pedal the carb to keep it running, though.  If you go with
> a carb without a choke, make sure you get a multi-strike capacitive
> discharge
> ignition (MSD-6AL, Mallory Hyfire, etc.).  With your engine, you should
> have one of those anyway.
>
> > the electric choke seems to work up to the point of "make me feather the
> > throttle until I hate it" until the car warms up.
>
> Demon makes carbs without choke horn, with choke horns but without choke
> plates and with choke horns and choke plates.  Sounds like you want one
> with a choke horn and the optional choke plate.  Be aware Demon carbs flow
> more than their CFM rating (i.e., a 750 Race Demon would flow more than a
> traditional 4150/4160 750 Holley).  Holley HP series carbs also flow more
> than their ratings.
>
> > My car had an Edelbrock carb when I bought it.  I think it was the
> 650cfm
> > model.  I didn't check.  It ran okay, but when I changed the heads and
> cam,
> > it ran like crap.  I didn't want to learn a new carburetor, so I
> switched
> > to a Holley 650dp.
>
> This is pretty typical when asking for carb user experience.  Most don't
> take the time to fine tune them for their application.  One will get lucky
> and have it be close enough for his application and will praise the carb.
> Another will have it run lousy and will knock the same carb when a few
> days
> of tuning with a wide band O2 sensor would have had the carb running
> great.
>
> > I considered Demon, and while they're probably built better than Holleys
> > they don't share that many parts - so if you need jets, power valves,
> etc.,
> > you have to order them - probably not a big deal.
>
> This is not true.  Jets, power valves, squirters etc. are all
> interchangeable
> with Holley.
>
> > OK, Any feedback on Edelbrock 800 series?
>
> It's just a larger CFM version of the 750 CFM AFB.  AFB's are very
> reliable
> carbs and are easier to tune than Holleys but generally make less power
> for the same CFM rating.  They are also less adaptable to large cam
> overlap.
> Another carb worth looking into is the Quick Fuel Technology Holley clone.
> QFT carbs are made of aluminum (lighter), accept the usual Holley tuning
> parts and have provisions that allow you to change the power valve channel
> restrictions and idle and high-speed air bleeds for fine tuning.
>
> Dan Jones
>  _______________________________________________
>
> Detomaso Forum Managed by POCA
>
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
>
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso
>

-- 
Michael L. Shortt
Savannah, Georgia
www.michaelshortt.com
michael at michaelshortt.com
912-232-9390

This email is protected by the Electronic Communications Privacy
Act, 18 U.S.C. Sec. 2510-2521, is confidential and may be legally
privileged. If you are not the intended recipient, you are hereby notified
that any retention, dissemination, distribution or copying of this
communication is strictly prohibited. Please reply to the sender that you
have received this message in error, then delete it. Thank you