Software Newsletter #10 - November 15, 2000
1. Holley HP 950 Alcohol Carbs
New Quay 4-Link Dragster
3. FREE Software Download
4. REAL World Technical Support
5. New Digital Altimeter
-- Holley HP 950 Alcohol Carbs --
I've been building my own 4150 alcohol carbs for a few years now, and
it is refreshing to see that Holley is finally catching up. The HP carbs
are pretty good out of the box, but still won't work (at all!) on a
drag car without some modification. I've done a few of these carbs for
some of my friends, so I thought it was time to purchase one of my own
to see if any advances have been made.
First I would like to say again that a mechanical fuel pump is not necessary.
Fuel volume is fuel volume, period. A simple flow test will reveal whether
your current fuel system is capable of delivering the proper volume
of fuel. The best method to test flow, is to take off the fuel bowls
and put each one into an empty fuel jug with the hoses still attached.
This way you are testing actual fuel flow, through the regulators and
needle and seats. Run your fuel pump for 15 seconds and then measure
the amount of fuel in both containers. If each container has a half
gallon of fuel ( a total of 1 gallon), then your fuel system is adequate,
providing that your fuel cell is located in front of the fuel pump.
In this location, G-Force will actually help your fuel delivery. In
the past, I have used the BG-280 pump, though now I am testing the BG-400
Holley still ships these carbs with power valves. The only reason I
can think of for doing this is that the circle track market is larger.
A power valve simply cannot be used in the back bowl of a drag race
application. A recent check of the Barry Grant catalog stills shows
that BG says that the only way to use a carb with a power valve is to
mount the carb sideways on the manifold. Maybe ten years ago, Barry!
Simply remove the power valves from both metering blocks and replace
them with plugs, Holley part #26-36. You must increase the total jet
area accordingly. Holley is using a .120 PVCR (Power Valve Channel Restriction)
in these metering blocks, an area of .011310. The carb is shipped with
a .144 jet which has an area of .016277. So, the total jet area is .027587
or about a .188 jet size. Holley always jets these carbs rich, so be
prepared to lean the thing out quite a bit, but it is better to be safe
that sorry. So, plug both power valves an install .188 jets at all four
corners to start. You also must have jet extensions in the rear bowl.
Holley now ships this carb with a notched float for this purpose. Either
use the Holley extended jets or the Moroso extension part# 65441 and
use the notched float. I recommend using two (2) bowl extensions to
increase the amount of bowl capacity. I use Moroso's, part# 65221 on
both bowls. DO NOT install the foam that is packaged with this extension!
Give the secondary idle screw about a half of a turn in more to start.
You want to have both throttle plates open about the same amount at
idle. If you don't do this, you will end up with the primary throttle
plates opened so far, that you will uncover the transfer slot, and the
carb will run too lean at idle. You can check this by monitoring your
EGT. It should idle around 450 to 550 degrees. If the exhaust temperature
is hotter than this, the engine will build too much heat at idle. After
you get it running, remove the carb and check the clearance of the primary
and secondary throttle plates. If the primary is still open too far,
open the secondary a little more and back off of the primary the same
amount. That is all there is to it!
I took mine out to test it and it was running out of fuel. A total disassembly
showed that somehow, Holley had installed three (3) float springs in
the secondary bowl instead of one! No float drop there! So we will have
to go back tomorrow night and try it again. I'll keep you informed.
-- New Quay 4-Link Dragster --
Well, we finally bit the bullet and bought a 4-link dragster. Now
all the tracks will be ground smooth for sure! Anyway, this is a really
nice car. We put a little 433 big block in it and went to Cecil County
to test it. I can't understand why everyone says that you can't get
a light with a 4-link car. Really! I put .015 in the box and the very
first light out of the trailer was a .399! So, we tried it again and
went .400. Jeez, lets try it again. So we did and went .398! So we went
to Atco and put .020 in the box and out of the trailer went .406. Okay,
so you probably think we are leaving at a high RPM. Guess what? Every
run was made with a 4800 RPM chip! After looking at the DataMaster computer
graphs, we took a stab at a throttle stop factor, set the stop and went
8.880 on the very first throttle stopped run. Killer car!
And now I can say what everyone else has been telling me for years.
WHAT BUMPS? That's right, every track is as smooth as glass. This car
rides like a Cadillac! I can't say much for the big block. It dropped
a valve on the 7th pass! I guess there is a learning curve there. Yesterday,
we dropped the small block in the car because they don't eat valves!
We'll test the small block combo tomorrow.
-- FREE Software Download --
Our DataMaster Analyzer software, Version 2.0, is available to you as
a FREE download on our web site. You don't need a data recorder to test
the software and see exactly what a DataMaster Sportsman Computer does
better than any other data logger system in the world! If you have any
older version of this software, download this as a FREE update.
-- REAL World Technical Support --
With Family Software, you'll get better technical support than anywhere
on the planet. Why? Because, I design and program all of Family Software's
products and I use them all on my own very competitive Super Comp dragster.
All of my 30+ years of experience and knowledge is available to you
and our other customers. Try to find that kind of information at any
one of our competitors. You won't be able to, I guarantee it! Family
Software cares about the racer and his/her success as a racer. The other
companies just want your money!
-- New Digital Altimeter/Barometer --
We also have in stock, the best electronic altimeter that I have ever
seen. It has a resolution of just one (1) foot. We had previously sold
a unit that had a resolution of three (3) feet and we thought that was
good! The new unit is just $149.95. You just can't beat that! To read
the specs on this unit, just go to the Products page on our web site
and click on Digital Altimeter.
-- Toll Free Ordering --
We also have a new Toll Free Order line to save you even more money!
If you're placing an order by phone, call 877-497-0992. If you need
information or technical help, call 610-497-5561.
-- Secure Ordering --
You can safely order directly from our web site. All of your information
and it is posted on the web site. Our company has now been registered
with the Public Eye. You can check our ratings by clicking on the Public
Eye link on our Home Page or Order Form.
have questions or topics that you would like to see covered in this
newsletter, please Email them to me. Or,
start a new topic on the bulletin board located on our web site. I'll
be glad to join in.
Family Software - Drag Racing Computers and Software
http://www.iFamilySoftware.com - 610.497.5561(Voice/Fax)
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