[DeTomaso] Holley Carb jet extension-stalls on braking

Art Stephens artstephens at verizon.net
Tue Jul 28 15:09:34 EDT 2009


Clay,
     The 330 number is at the flywheel and with the old more optimistic 
ratings.  330 minus the 20 % for drive train loss equals 264 HP at the 
wheels.  Sounds like a good running stock engine!

Art



----- Original Message ----- 
From: "clay willmott" <claywillmott at hotmail.com>
To: <charlesmccall at gmail.com>; "Pantera Forum" <detomaso at realbig.com>
Sent: Tuesday, July 28, 2009 11:59 AM
Subject: Re: [DeTomaso] Holley Carb jet extension-stalls on braking


>
> My engine is rebuilt and I was told had 480 HP where I bought it which was 
> a total fallacy.
> It had around 270 HP on Chasis Dyno recently thus I assume it is "roughly" 
> stock.  A 71 pushbutton should have 330 hp as I recall.
>
> I was shocked today when holley told me I had a 800 cfm also.
>
>
>
>> From: charlesmccall at gmail.com
>> To: claywillmott at hotmail.com; detomaso at realbig.com
>> Subject: RE: [DeTomaso] Holley Carb jet extension-stalls on braking
>> Date: Tue, 28 Jul 2009 19:37:31 +0200
>>
>> Hi Clay,
>>
>> This was talked about last month or so, and my take on the discussion:
>>
>> 1) Some people have gotten lucky with jet extensions and/or tubes to 
>> reduce
>> the problem. But numerous people have had no luck despite adjusting 
>> floats
>> up/down/sideways or adding tubing. In any case, the car stalls from too 
>> MUCH
>> fuel, not from fuel starvation (it sloshes out of the float bowls) so you
>> should adjust the level down, if anything, not up.
>> 2) The root cause of the problem is having an intake designed for a front
>> engined car, which tilts the car. I have yet to hear from anyone who has
>> milled their intake flat who has continued to have this problem after 
>> doing
>> so. More work, but it appears to be more effective.
>> 3) My old ´72 Pantera used to stall under hard braking, but my '85 does 
>> not,
>> for whatever reason, either with the stock (from DeTomaso) Holley 
>> Dominator
>> intake, or the current Weiand intake.
>> 4) Something else that caught my attention - is your engine what you 
>> would
>> describe as "extreme"? If not, then conventional wisdom says your carb is
>> huge for a 351 cubic inch Cleveland. Common sizes are 600cfm, 650, up to
>> 750, but very few people run larger, especially with a stock engine.
>> Something to think about.
>>
>> Good luck!
>>
>> Charles McCall
>> 1985 DeTomaso Pantera GT5-S #9375
>> "Raising Pantera Awareness Across Europe"
>> http://www.poca.com/index.php/gallery/?g2_itemId=2323
>>
>> -----Mensaje original-----
>> De: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] En
>> nombre de clay willmott
>> Enviado el: martes, 28 de julio de 2009 19:22
>> Para: List Pantera
>> Asunto: [DeTomaso] Holley Carb jet extension-stalls on braking
>>
>>
>> I recall a thread on the 351 C not being level and tilts forward which 
>> may
>> cause the car to stall in some cases with hard braking.
>> A few people suggested a type of venturi or tube apparatus to run from 
>> the
>> front to back of the carb as I recall.
>> My car does this of course.  It will die if you really mash the brakes 
>> right
>> as you come to a complete stop.  It does Not do it with accelerating.
>>
>> I called Holley to order one of these and the tech person who was very 
>> nice
>> and seemed to know an awful lot said I would need Jet extensions 
>> #122-5000
>> which are 8 bucks.
>>
>> Questions:
>>
>> Can I try to have someone reset the float higher to stop stalling on
>> braking?
>>
>> Do I actually need those venturi pipe things or the jet extensions above?
>>
>> Do I have to remove the carb?
>>
>> A local shop told me if I bring it in they can try to adjust it then put 
>> it
>> on the dyno??
>>
>> I am not sure if my carb needs rebuilding or anything it is about 6 yrs 
>> old
>> and is a Holley 4150 with 800CFM double pump with manual choke and
>> mechanical secondary according to tech today when I gave him the stamped 
>> #
>> on my carb.
>>
>> Thanks
>>
>> CW
>>
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