[DeTomaso] Stalling on hard braking

[Mikael]

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