[DeTomaso] Engine Inlet Temperature Test Results
jderyke at aol.com
jderyke at aol.com
Tue Dec 9 15:09:38 EST 2014
FWIW, there are no known no wind tunnel studies on a Pantera beyond the rudimentary one Ford did in 1971, I proposed we run a set when the cheaper-to-run tunnel opened in N Carolina a decade ago. I even laid out a series of tests we could do in one day, although I'm 2000 miles away from the site, with a sick wife. There was much enthusiasm on the Forum, some money was pledged and lots of people wanted the data once someone else did the work. But no one stepped up to actually do it, the date was lost and it didn't happen. No one else has ever even proposed this.
From guesses and examining photos of dust trails at dry lakes & salt spray at Bonneville, the Pantera seems to dump 'some' hot air from the radiator out the wheelwells with 'more' going under the car; amounts of each unknown. The huge low-pressure area generated by our sugar-scoop decklid probably influences that under-car flow all the way up front, especially if the car has side-skirts like Mad Dawg used in SS runs. So I'm not surprised that considerable hot air is being ingested by the carb.
Quite a few Bonneville runners found over the years that adding air scoops to feed the engine compartment works better if the feeds are NOT connected to the carb(s). One successful record holder said, 'hooking scoops to the intakes messed up the carbs' fuel metering. We went faster when there was a big gap between the scoop inlets and the carb intakes'. I guess this means they made more power from cool air than from 'ram-air supercharging with cool air', EFI effects? Dunno- more guesses. Too bad about the wind tunnel runs
-----Original Message-----
From: JF <pantera at vtc.net>
To: detomaso <detomaso at poca.com>
Sent: Tue, Dec 9, 2014 7:59 am
Subject: [DeTomaso] Engine Inlet Temperature Test Results
I have followed some of the threads about engine inlet air temperature
and how to get fresh air into the Pantera's engine. My tests showed
that I had about 40 degrees warmer temperature with my sealed air box
hoses disconnected and the air coming into the engine from the bottom
of the car. The inlet engine temperature is normally about ten degrees
warmer than ambient air temperature with the hoses connected to the
small inlet air scoops that replaced the side windows. The warmer inlet
air temperature tells me that there is warmer air from the radiator
that is following the boundary layer along side of the car. The car
also has a vented front hood and this may be adding to the increased
inlet air temperature.
My data was easy to attain because the car is fuel injected and I also
have a stand alone outside air temperature gauge in the dash. There is
a system monitor on the dash that shows engine inlet air temperature
along with many other things. I have done a yarn test with the air
scoops and with the engine off at a 25 mph coasting speed, the yarn is
being forced into the scoops. The air box is made by Spectre and the
inlet nozzles have been reversed to allow for more clearance when I cut
and install the engine screen.
In my opinion, pulling air in from the bottom of the car as the factory
did is not going to give much of a temperature reduction. There is a
lot of air under the car that has already gone through the radiator and
with as low as a Pantera is, I believe you will be picking up heat from
the pavement as well.
I have had no problems with the engine starving for air with this set
up at full throttle or any rpm. For what it is worth, the engine is a
388 cubic inch Fontana with CHI 3V heads and matching CHI air gap
intake manifold. The fuel injection system is a F.A.S.T XFI 2.0 speed
density bank fired.
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-------------- next part --------------
FWIW, there are no known no wind tunnel studies on a Pantera beyond the
rudimentary one Ford did in 1971, I proposed we run a set when the
cheaper-to-run tunnel opened in N Carolina a decade ago. I even laid
out a series of tests we could do in one day, although I'm 2000 miles
away from the site, with a sick wife. There was much enthusiasm on the
Forum, some money was pledged and lots of people wanted the data once
someone else did the work. But no one stepped up to actually do it, the
date was lost and it didn't happen. No one else has ever even proposed
this.
From guesses and examining photos of dust trails at dry lakes & salt
spray at Bonneville, the Pantera seems to dump 'some' hot air from the
radiator out the wheelwells with 'more' going under the car; amounts of
each unknown. The huge low-pressure area generated by our sugar-scoop
decklid probably influences that under-car flow all the way up front,
especially if the car has side-skirts like Mad Dawg used in SS runs. So
I'm not surprised that considerable hot air is being ingested by the
carb.
Quite a few Bonneville runners found over the years that adding air
scoops to feed the engine compartment works better if the feeds are NOT
connected to the carb(s). One successful record holder said, 'hooking
scoops to the intakes messed up the carbs' fuel metering. We went
faster when there was a big gap between the scoop inlets and the carb
intakes'. I guess this means they made more power from cool air than
from 'ram-air supercharging with cool air', EFI effects? Dunno- more
guesses. Too bad about the wind tunnel runs
-----Original Message-----
From: JF <pantera at vtc.net>
To: detomaso <detomaso at poca.com>
Sent: Tue, Dec 9, 2014 7:59 am
Subject: [DeTomaso] Engine Inlet Temperature Test Results
I have followed some of the threads about engine inlet air temperature
and how to get fresh air into the Pantera's engine. My tests showed
that I had about 40 degrees warmer temperature with my sealed air box
hoses disconnected and the air coming into the engine from the bottom
of the car. The inlet engine temperature is normally about ten degrees
warmer than ambient air temperature with the hoses connected to the
small inlet air scoops that replaced the side windows. The warmer inlet
air temperature tells me that there is warmer air from the radiator
that is following the boundary layer along side of the car. The car
also has a vented front hood and this may be adding to the increased
inlet air temperature.
My data was easy to attain because the car is fuel injected and I also
have a stand alone outside air temperature gauge in the dash. There is
a system monitor on the dash that shows engine inlet air temperature
along with many other things. I have done a yarn test with the air
scoops and with the engine off at a 25 mph coasting speed, the yarn is
being forced into the scoops. The air box is made by Spectre and the
inlet nozzles have been reversed to allow for more clearance when I cut
and install the engine screen.
In my opinion, pulling air in from the bottom of the car as the factory
did is not going to give much of a temperature reduction. There is a
lot of air under the car that has already gone through the radiator and
with as low as a Pantera is, I believe you will be picking up heat from
the pavement as well.
I have had no problems with the engine starving for air with this set
up at full throttle or any rpm. For what it is worth, the engine is a
388 cubic inch Fontana with CHI 3V heads and matching CHI air gap
intake manifold. The fuel injection system is a F.A.S.T XFI 2.0 speed
density bank fired.
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