[DeTomaso] Stalling on hard braking

[Boyd Casey]

I didn't know you had written a book. Send me the name and I will try to
find a copy. When I first tried to connect my vents it didn't work , (this
was before I read the Holley book and saw the info about air cleaners. My
air cleaner was to small in diameter and (more importantly I think too
narrow. They say you must have at least 3/4 " clearance between the top of
the vent and the lid of the air cleaner. My dual plenum gives me around 3"
between the top of the vents and the top of the plenum The air filters (K&N
style) are not even in the Plenum but are attached perpendicularly to the
plenum. Just changing the air cleaner was not enough to remedy the problem.
My next step would be to install the vent whistles which require removal of
the float bowls . I have the whistles but did not have the bowl gaskets but
I may still do it if the results are not good enough. I only tested it on
the street not exactly track conditions!


On Fri, Aug 2, 2013 at 4:02 PM, Mikael <mikael_hass at mail.tele.dk> wrote:

> Boyd, great to hear you actually read the Holley book and came with some
> conclusions many often forgot. Have you read my book? Well worth it I
> think... :-)
>
> I have the same stalling problem after installing Dennes Quella brakes. I
> tried the hose on vents thing, didn't work for me, it's the jets/venturis
> themselves that flows the fuel from the rear. If you do the hose thing,
> make
> sure the hole in the hose is as big as the two holes in the vents combined
> so you don't introduce a bottleneck.
>
> Mikael
>
> -----Oprindelig meddelelse-----
> Fra: Boyd Casey [mailto:boyd411 at gmail.com]
> Sendt: 1. august 2013 21:12
> Til: detomaso at poca.com
> Emne: [DeTomaso] Stalling on hard braking
>
> I had mentioned that since I installed my new Brembo Calipers ( the same
> ones used in the  996 model ) (2001 to 2005 911 Turbo) A perfect choice for
> the Pantera due to their similar weight and  weight distribution . Along
> with my dual CNC master cylinders, balance bar my and oversize  Coleman
> vented rotors with gas vents , my car stops so hard and fast that I risk
> having teeth fly out as a result of the negative g forces! Anyway ever
> since
> these brakes were installed I have had a problem with stalling under hard
> braking. I obtained and started reading the Holley 4150 double pumper
> manual
> in an effort to remedy this situation as well as improve my
> Carbperformance.
> I found out several interesting things. Apparently many people mistakenly
> buy a larger CFM carb in the mistaken belief that it will give them more
> gas
> and more power. The truth is a higher CFM carb will give more power ( to
> the
> correct engine ) ie: worked heads, High CI displacement, High compression
> pistons. radical cam , headers etc but a smaller CFM carbwill give much
> better throttle response and power off the line.
> Another
> interesting thing I read said that an engine with #%! CI displacement
> should
> have an air cleaner at least 14" in diameter and 4" high with a minimum of
> 3/4" clearance between the vents and the lid of the air cleaner.
> I was running a smaller air cleaner because I liked the way it looked so it
> was both to small in diameter and too narrow ( the vents were too close to
> the lid of the air cleaner. I reinstalled my dual plenum that uses two K&N
> style air filters that allows much greater cfm and has almost 4" clearance
> above the vents. The next thing ( although it should really be the first
> thing is to adjust the float levels so gas is just dribbling out of the
> sight holes. They also recommend vent whistles but since I didn't have a
> Holley rebuild kit or float gaskets I used a trick i found on the "Off
> Road"
> web sights. They recommend taking a piece of tubing and connecting the two
> vents. This prevents the gas in the float bowls from sloshing under hard
> braking and accelerating and causing a flooding situation. Since as i said
> I
> didn't have float bowl gaskets handy I couldn't install my new vent
> whistles
> so instead I took a round a 6" piece of gas line and attached it to the two
> vents and cut a small hole in the middle near the air cleaner mounting
> post.
> I also used some carb cleaner and gave everything the once over. So far it
> appears to have done the trick. I only tested it accelerating and braking
> up
> and down my block but so far it seems to be working.
> Boyd
>
>
>