using SF Air Turbine to determine Header problems

Post Reply
maxracesoftware
Vendor
Posts: 3627
Joined: Sat Feb 14, 2004 4:04 pm
Location: Abbeville, LA
Contact:

using SF Air Turbine to determine Header problems

Post by maxracesoftware »

using the SuperFlow Air Turbine to determine potential Header problems

1st example : SBC 401.0 cid = 4.125x3.750
SBC 401.0 cid = 4.125x3.750
after new Port Work + 2.125 int valves + Hurricane Porting
10:1 CR Chevron Super Unleaded 93
950 HP Carb
34 deg btdc
------------------------------------
change=add on collectors for 24 inch total

RPM
3800 = gained +61.6
3900 = gained +81.3
4000 = gained +79.5
4100 = gained +75.5
4200 = gained +68.2
4300 = gained +56.6
You do not have the required permissions to view the files attached to this post.
MaxRace Software
PipeMax and ET_Analyst for DragRacers
https://www.maxracesoftwares.com
maxracesoftware
Vendor
Posts: 3627
Joined: Sat Feb 14, 2004 4:04 pm
Location: Abbeville, LA
Contact:

Re: using SF Air Turbine to determine Header problems

Post by maxracesoftware »

1st example : SBC 401.0 cid = 4.125x3.750
SBC 401.0 cid = 4.125x3.750
after new Port Work + 2.125 int valves + Hurricane Porting
10:1 CR Chevron Super Unleaded 93
950 HP Carb
34 deg btdc
------------------------------------
change=add on collectors for 24 inch total

RPM
3800 = gained +61.6
3900 = gained +81.3
4000 = gained +79.5
4100 = gained +75.5
4200 = gained +68.2
4300 = gained +56.6
You do not have the required permissions to view the files attached to this post.
MaxRace Software
PipeMax and ET_Analyst for DragRacers
https://www.maxracesoftwares.com
maxracesoftware
Vendor
Posts: 3627
Joined: Sat Feb 14, 2004 4:04 pm
Location: Abbeville, LA
Contact:

Re: using SF Air Turbine to determine Header problems

Post by maxracesoftware »

using the SuperFlow Air Turbine to determine potential Header problems

2nd example : BBC 468 4.310x4.000
BBC 468 4.310x4.000
#990 Open Chamber 2.300/1.880
Edelbrock Victor 454-R w/Moroso open-hole spacer
Holley 0-9375 1050 92/92 jets
C-14 Race Fuel
36 btdc
Lunati solid roller .817/.778 286/304 112 on 110 CL
12:1 CR Arias
Jesel Belt
Milodon oil pan 7qts 20/50 Valvoline
Custom made Headers 2.125x28.5 4.000x9.250
Moroso 3-vane vac pump
-----------------------------------
add on collector extensions for 19.5 inch total

4500 = gained +65.6 5000 = gained +104.7
4600 = gained +74.4 5100 = gained +110.4
4700 = gained +76.9 5200 = gained +95.8
4800 = gained +86.7 5300 = gained +91.1
4900 = gained +98.8 5400 = gained +55.0
You do not have the required permissions to view the files attached to this post.
MaxRace Software
PipeMax and ET_Analyst for DragRacers
https://www.maxracesoftwares.com
maxracesoftware
Vendor
Posts: 3627
Joined: Sat Feb 14, 2004 4:04 pm
Location: Abbeville, LA
Contact:

Re: using SF Air Turbine to determine Header problems

Post by maxracesoftware »

using the SuperFlow Air Turbine to determine potential Header problems

2nd example : BBC 468 4.310x4.000
BBC 468 4.310x4.000
#990 Open Chamber 2.300/1.880
Edelbrock Victor 454-R w/Moroso open-hole spacer
Holley 0-9375 1050 92/92 jets
C-14 Race Fuel
36 btdc
Lunati solid roller .817/.778 286/304 112 on 110 CL
12:1 CR Arias
Jesel Belt
Milodon oil pan 7qts 20/50 Valvoline
Custom made Headers 2.125x28.5 4.000x9.250
Moroso 3-vane vac pump
-----------------------------------
add on collector extensions for 19.5 inch total

4500 = gained +65.6 5000 = gained +104.7
4600 = gained +74.4 5100 = gained +110.4
4700 = gained +76.9 5200 = gained +95.8
4800 = gained +86.7 5300 = gained +91.1
4900 = gained +98.8 5400 = gained +55.0
You do not have the required permissions to view the files attached to this post.
MaxRace Software
PipeMax and ET_Analyst for DragRacers
https://www.maxracesoftwares.com
maxracesoftware
Vendor
Posts: 3627
Joined: Sat Feb 14, 2004 4:04 pm
Location: Abbeville, LA
Contact:

Re: using SF Air Turbine to determine Header problems

Post by maxracesoftware »

using the SuperFlow Air Turbine to determine potential Header problems

2nd example : BBC 468 4.310x4.000
BBC 468 4.310x4.000
#990 Open Chamber 2.300/1.880
Edelbrock Victor 454-R w/Moroso open-hole spacer
Holley 0-9375 1050 92/92 jets
C-14 Race Fuel
36 btdc
Lunati solid roller .817/.778 286/304 112 on 110 CL
12:1 CR Arias
Jesel Belt
Milodon oil pan 7qts 20/50 Valvoline
Custom made Headers 2.125x28.5 4.000x9.250
Moroso 3-vane vac pump
-----------------------------------
add on collector extensions for 19.5 inch total

4500 = gained +65.6 5000 = gained +104.7
4600 = gained +74.4 5100 = gained +110.4
4700 = gained +76.9 5200 = gained +95.8
4800 = gained +86.7 5300 = gained +91.1
4900 = gained +98.8 5400 = gained +55.0
You do not have the required permissions to view the files attached to this post.
MaxRace Software
PipeMax and ET_Analyst for DragRacers
https://www.maxracesoftwares.com
maxracesoftware
Vendor
Posts: 3627
Joined: Sat Feb 14, 2004 4:04 pm
Location: Abbeville, LA
Contact:

Re: using SF Air Turbine to determine Header problems

Post by maxracesoftware »

ptuomov wrote: Wed Sep 02, 2020 3:25 pm What’s the best way to estimate how much charge actually gets trapped in the cylinder and how much flows straight thru to exhaust?
if your Engine Dyno has accurate Fuel Consumed Lbs/Hour readings
and you also need to input each Dyno Pull's Weather conditions, and have accurate Flow Bench CFM Numbers,
then plug everything into PipeMax v4.50.... make PipeMax's Peak HP exactly matchup your Engine Dyno's Peak HP,
and make PipeMax's Fuel Consumed reading exactly matchup your Engine Dyno's Fuel Consumed reading,
and same thing with the BSFC value ... adjust the Air/Fuel Ratio a little at a time until you get exact matches
between Fuel Consumed and BSFC and Peak HP .... then look at how much Intake System CFM and VE% it takes for that matchup .

*** i forgot to mention these very important input values :
you must measure your Cylinder Heads intake and exhaust Port CenterLine Lengths and each's Port Volume CC's
then plug in that info into PipeMax ... then adjust each Port velocity FPS until you get an exact
matchup in PipeMax calculated Port Volume CC -to- your actual Port Volume CCs
... use must use a Class "A" Burette for accuracy .

--------------------

more Air Turbine info :

Only use the Air Turbine on a few Dyno Pulls to see if Collectors or exhaust system has any problems
if no real problems, remove it for rest of Dyno Pulls ,
reason :
[1]= the Air Turbine restricts Air entering the Carb(s) around the sides of the Veunturis entries .
Carbs like to breathe from along sides , not just straight down direction like the Air Turbine would force Air .
If the Carb is too small for the RPM Range of the Engine , the Air Turbine can further cause a loss in TQ and HP .
If the Carb is OK or too large for the Engine , you probably will not see any difference in TQ or HP with or without the Air Turbine

[2]= since the Air Turbine body has pretty much "Length or Height" ,
it can sometimes affect Intake System Tuned length one way or another , meaning increase or decrease VE , TQ, and HP
at some RPM points .

-------------------------------

in the engine examples above ,
you would look at "VE% increase Rates" for exhaust system problems .
If Air Turbine shows VE% in the 80's or 90's during 1st lower RPM Ranges , then jumps to 110's + VE% quickly in later RPM Ranges,
then Exhaust system length is wrong .

just compare VE% numbers and "RATE of VE% increase" , in middle range between Peak TQ RPM -to- Peak HP RPM
-VS- lower RPM range , to see if theres problems .
MaxRace Software
PipeMax and ET_Analyst for DragRacers
https://www.maxracesoftwares.com
Post Reply