[DeTomaso] Holley Carb jet extension-stalls on braking

[Tomas Gunnarsson]

Paul,

It's not fixed. I've not wanted to experiment with secondary fuel level unless I can monitor AFR. I rarely brake that hard on the street going that slow and on the track it's not a problem as I never come anywhere close to a complete stop so the engine keeps running anyway.

Tomas

----- Original Message ----- 
From: "Paul - Home" <thedrol at pobox.com>
To: "'List Pantera'" <detomaso at realbig.com>
Sent: Tuesday, July 28, 2009 8:14 PM
Subject: Re: [DeTomaso] Holley Carb jet extension-stalls on braking


> So what did you do to fix it (assuming that it is now fixed)?
> 
> Paul
> #9270
> 
> Tomas Gunnarsson wrote:
>> I had my intake milled flat and it did nothing for stalling with all other adjustments the same.
>> 
>> Tomas
>> 
>> ----- Original Message ----- 
>> From: "Charles McCall" <charlesmccall at gmail.com>
>> To: "'clay willmott'" <claywillmott at hotmail.com>; "'List Pantera'" <detomaso at realbig.com>
>> Sent: Tuesday, July 28, 2009 7:37 PM
>> Subject: Re: [DeTomaso] Holley Carb jet extension-stalls on braking
>> 
>> 
>>> 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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