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Old 09-27-2005, 07:01   #1 (permalink)
Bill Beyer
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Road Demon update

Well after waaay too much time spent trying to diagnose a wicked miss in the
429 which turned out to be a cracked distributor cap I finally got the BG
Road Demon installed. The biggest challenge was trying to figure out how to
get the kickdown linkage hooked up. Holley makes a pretty handy little $5
piece for extending the stock linkage rod which it turns out with a slight
modification makes a handy place to mount the return spring. The whole
kickdown setup was not one of Ford's better ideas and even tho' I bought the
model with the Ford kickdown linkage, it was still a major PITA. Overall I'm
pretty happy with the final setup although I'm gonna go get a different
spring on my next trip to my local partshaus.

The carb itself rocks! Absolutely instant power off throttle and extremely
smooth all the way through the powerband. It feels like a FI motor. I still
need to tweak the idle mixture a little, it's running fat but overall a very
nice piece. I was able to get the stock air cleaner fitted back on and the
only way you can tell once it's installed is if you bend down and peek under
the front and see the Demon which is cast into the end of the fuel bowl.

I had to run a new 12V wire from the fuse box thru the firewall to the
electric choke but a grommet and some convoluted tubing makes it a very
clean installation. I took the opportunity to clean up some of the wiring in
the engine compartment and added a quick disconnect in the 12V source to the
coil as a simple anti theft measure. It won't deter a dedicated scumbag but
I hope it will slow down the average garden variety dirtball.

--
TS#10


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Old 09-27-2005, 11:01   #2 (permalink)
one80out@hotmail.com
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Re: Road Demon update


Bill Beyer wrote:

I still
> need to tweak the idle mixture a little, it's running fat but overall a very
> nice piece. I was able to get the stock air cleaner fitted back on and the
> only way you can tell once it's installed is if you bend down and peek under
> the front and see the Demon which is cast into the end of the fuel bowl.


Why hide the Demon? The styling is a strong point, imo.

About the idle, I gave up on a 625 cfm Road Demon on my C code 289
after months of rejetting and float bowl adjustments -- yeah and idle
screw and curb idle too -- failed to lean out the idle to anything
close to acceptable. Admittedly it was too big a carb for a wimp 289,
by 150 cfm or so. But that was not the issue at idle; after all I was
too rich, not too lean.

Anyway, my two cents is that other posters on the VMF forum who had
this same problem had been offered a free fix of some sort by BG, as I
recall some kind of restrictor to install in the idle mixture surface.
The bad news is that these did not seem to cure the prob either.

But hey, we're talkin wimpy 289's and 302's -- or in one case a
Cleveland. So with a 429 your mileage may vary.

180 Out

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Old 09-27-2005, 12:01   #3 (permalink)
Bill Beyer
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Re: Road Demon update


<one80out@hotmail.com> wrote in message
news:1127839968.345262.317640@g44g2000cwa.googlegroups.com...
>
> Why hide the Demon? The styling is a strong point, imo.
>
> About the idle, I gave up on a 625 cfm Road Demon on my C code 289
> after months of rejetting and float bowl adjustments -- yeah and idle
> screw and curb idle too -- failed to lean out the idle to anything
> close to acceptable. Admittedly it was too big a carb for a wimp 289,
> by 150 cfm or so. But that was not the issue at idle; after all I was
> too rich, not too lean.
>
> Anyway, my two cents is that other posters on the VMF forum who had
> this same problem had been offered a free fix of some sort by BG, as I
> recall some kind of restrictor to install in the idle mixture surface.
> The bad news is that these did not seem to cure the prob either.
>
> But hey, we're talkin wimpy 289's and 302's -- or in one case a
> Cleveland. So with a 429 your mileage may vary.
>


I agree that the carb is a pretty piece of work but in order to fit under
the hood of a 70 XL I need a low profile air cleaner so no matter what I use
it's going to hide the carb unless I get one of those cheesy looking
triangular Edelbrock things. I initially went and got a new Moroso low
profile unit but it required some significant modification to clear the
choke lever. I also test fitted a small Holley unit but it was even taller
than the low profile Moroso. In the end I was able to fit the stock air
cleaner back on with a minimum of modification and it still has the original
429-4V decal on the top so I'm happy.

Thanks for the tip on the experience you had. This is a 725 cfm unit and
it's what's recommended by BG for this size motor so we'll just have to wait
& see. The biggest problem right now is at cold start. After it warms up the
idle is a little rough but not unacceptable. I'm sure it will get worse once
the plugs start loading up.

--
TS#10


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Old 09-27-2005, 14:01   #4 (permalink)
Big Al
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Re: Road Demon update


"Bill Beyer" <bill_beyer@excite.cXoYmZ> wrote in message
news:TJ6dnZYkx4mKD6TeRVn-pA@comcast.com...
>
> I agree that the carb is a pretty piece of work but in order to fit under
> the hood of a 70 XL I need a low profile air cleaner so no matter what I
> use
> it's going to hide the carb unless I get one of those cheesy looking
> triangular Edelbrock things.


Which are pure garbage. Have one around here off one of my OT cars. I could
easily be persuaded to send it your way.

Al #35


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Old 09-27-2005, 15:01   #5 (permalink)
Bill Beyer
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Posts: n/a
Re: Road Demon update


"Big Al" <nospamsal1@qwest.net> wrote in message
news:w2i_e.30$FF4.1086@news.uswest.net...
>
> "Bill Beyer" <bill_beyer@excite.cXoYmZ> wrote in message
> news:TJ6dnZYkx4mKD6TeRVn-pA@comcast.com...
> >
> > I agree that the carb is a pretty piece of work but in order to fit

under
> > the hood of a 70 XL I need a low profile air cleaner so no matter what I
> > use
> > it's going to hide the carb unless I get one of those cheesy looking
> > triangular Edelbrock things.

>
> Which are pure garbage. Have one around here off one of my OT cars. I

could
> easily be persuaded to send it your way.
>
> Al #35


That's OK Al....I have enough junk in my garage. The stock one is working
just fine.

--
TS#10


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Old 10-01-2005, 13:01   #6 (permalink)
Bill Beyer
Guest
 
Posts: n/a
Re: Road Demon update


<one80out@hotmail.com> wrote in message
news:1127839968.345262.317640@g44g2000cwa.googlegroups.com...
>
> Bill Beyer wrote:
>
> I still
> > need to tweak the idle mixture a little, it's running fat but overall a

very
> > nice piece. I was able to get the stock air cleaner fitted back on and

the
> > only way you can tell once it's installed is if you bend down and peek

under
> > the front and see the Demon which is cast into the end of the fuel bowl.

>
> Why hide the Demon? The styling is a strong point, imo.
>
> About the idle, I gave up on a 625 cfm Road Demon on my C code 289
> after months of rejetting and float bowl adjustments -- yeah and idle
> screw and curb idle too -- failed to lean out the idle to anything
> close to acceptable. Admittedly it was too big a carb for a wimp 289,
> by 150 cfm or so. But that was not the issue at idle; after all I was
> too rich, not too lean.
>
> Anyway, my two cents is that other posters on the VMF forum who had
> this same problem had been offered a free fix of some sort by BG, as I
> recall some kind of restrictor to install in the idle mixture surface.
> The bad news is that these did not seem to cure the prob either.
>
> But hey, we're talkin wimpy 289's and 302's -- or in one case a
> Cleveland. So with a 429 your mileage may vary.
>
> 180 Out


Well after lowering the float levels significantly and a few laps around the
carb adjusting the mixture screws I think I've got it dialed in pretty well.
The idle is noticeably smoother but there's absolutely no stumble off idle.
It took about 1/2 to 3/4 of a turn on the front screws and about a half a
turn on the rears. Both float levels were pretty high from the factory and
took a significant amount of lowering.

I gotta say this carb really woke up this motor. We had our first
significant rain in a month here last night and this beast is a little scary
to drive when the oil starts coming up outta the asphalt. It took extremely
judicious application of the loud pedal to keep the front & rear from
swapping ends. I wasn't driving with an egg under the gas pedal, I was
driving with a soap bubble under there. At 1 point I was doing about 25-30
MPH, I pulled out to pass a car and when I gave it some juice the tires just
lit up without even downshifting. Hadta be a pretty impressive sight to see
that big ol' Galaxie about half sideways comin' down the road.

Speaking of handling I put a set of KYB Gas-A-Just shocks on it this week as
well and they were definitely a good investment. Two thumbs up for these
pieces.

--
TS#10


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