[DeTomaso] IDA Webers - Power Enrichment

wkooiman at earthlink.net wkooiman at earthlink.net
Wed Jul 25 20:54:20 EDT 2007


Thanks.  As usual, your info is great.

-----Original Message-----
>From: Daniel C Jones <daniel.c.jones2 at gmail.com>
>Sent: Jul 25, 2007 10:19 AM
>To: detomaso at realbig.com
>Subject: Re: [DeTomaso] IDA Webers - Power Enrichment
>
>> But I would respectfully dispute that a Cleveland will run out of breath
>> at 5500 rpm with Webers, as the factory Group 4's will show. Patrick Hals'
>> "Andy Warhol" car is weber equipped (I just checked my photos), and happily
>> pulls to his 6500 rpm rev-limiter. His last dyno sheet showed roughly 550
>> crankshaft horsepower.
>
>Vizard's testing of 48 IDA's was that they start to become restrictive
>above 480 HP.  That doesn't mean they won't make 550 HP, only that you'd
>make more power with with a larger size.
>
>> How far did you get with the dual Autolite inlines?  I see them mounted
>> on the 351C, and even in the Pantera engine compartment, but did you
>> start it up?  Tune it?  Drive it?
>
>You are looking at two different set-ups.  The ones installed on the red
>Pantera belong to Richard Openshaw.  I'm not sure of the status of his
>car.  The ones mounted on the Offy tunnel ram base belong to someone else
>who is loanng them to me to put on my white Pantera.  The carbs have been
>rebuilt.  Just need to work through the linkage and air cleaner issues.
>I also know of a 351C-powered Cobra replica running the inline Autolites
>and he likes them very much.
>
>> Which carburetors had the idle circuit?  The -A's or the -B's?
>
>The difference between the -A's and  -B's is the throttle bore size and
>CFM rating.  Part number DOZX 9510-A used 1 11/16" throttle bores and was
>rated at 850 CFM and was meant to be mounted as a single carb on a plenum
>intake.  Part number DOZX 9510-B used 2 1/4" throttle bores and was rated
>at 1400 CFM and was meant to be mounted on an independent runner manifold.
>Later versions were equipped with idle circuits.
>
>> And finally, if you had to choose between Webers or dual Autolite inlines,
>> which would you choose - assuming you'd be driving it mostly on the street,
>> plus the occasional track time?
>
>I've not run the Autolites yet so I can't really compare but Webers are
>more readily available and set up properly can work very well.  I drove
>Durango Dave's Kirkham FIA Cobra replica with 48 IDA's and it ran very
>well.
>
>Kaase mentioned Dyno Don used Autolite inlines for drag racing once
>and they worked well, after having the bugs worked out.
>
>I have an old magazine article on induction testing on a 351C.
>Various intakes and carbs incluidng tunnel ram 2x4 barrel and
>Autolite inlines were tested by Ak Miller.  Here's what it had
>to say:
>
>"The ninth test was the best. A pair of 2 1/4-inch throttle
>bore Autolite In-Lines were attached to the engine by way
>of a specially fabricated intake manifold. Seven-and-a-half
>inch-tall velocity stacks were slipped over the inlets, though
>Ak advises that stacks half that height should be used for
>better torque and sustained horsepower. Anyway, the torque
>peaked out at 4800 rpm, and the corrected. reading was 376
>lbs.-ft. It pulled evenly all the way up to its peak point,
>and horsepower was identical to the dual-four setup (398 at
>6600 rpm). But the difference was low-speed idling, and the
>dual Autolite system would properly idle at 600 rpm. Low
>speed operation was very good and termed fantastic by Ak
>in comparison to the dual-four inlet."
>
>Dan Jones
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