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HEADER SIZE #1233609 05/15/12 07:44 AM 05/15/12 07:44 AM
Joined: Jan 2007 Posts: 90 North Carolina C CALSDART OP member
CALSDART OP member C Joined: Jan 2007 Posts: 90 North Carolina	I need some advice on the correct header size for an engine that has been dyno'd at 800 hp. Current headers on this engine are 2 inch. This is a drag car. Last edited by CALSDART; 05/15/12 07:56 AM. Calvin Thompson

Re: HEADER SIZE [Re: CALSDART] #1233610 05/15/12 10:01 AM 05/15/12 10:01 AM
Joined: Jan 2003 Posts: 16,928 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,928 NC	What size engine (CID)? What is the peak torque and horsepower RPM points? Converter stall RPM? Car weight? Primary length and diameter are important. I love the 2-1/8 x 32" long headers on my 511 CID (~730-750 hp). 9.3x at 3225 lbs, 5500 stall, shift at 6700. 1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1

Re: HEADER SIZE [Re: CALSDART] #1233611 05/15/12 12:18 PM 05/15/12 12:18 PM
Joined: Nov 2009 Posts: 3,082 St. Paul , Mn. tubtar master
tubtar master Joined: Nov 2009 Posts: 3,082 St. Paul , Mn.	This'll get you in the ball park. http://www.wallaceracing.com/header_length.php

Re: HEADER SIZE [Re: CALSDART] #1233612 05/15/12 12:27 PM 05/15/12 12:27 PM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	2.25 primary, better with a step 2.125 to 2.25 or bigger on both, and 4.0 inch collector, a good merge collector of the proper size is worth some power also Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: HEADER SIZE [Re: tubtar] #1233613 05/15/12 04:01 PM 05/15/12 04:01 PM
Joined: Jan 2003 Posts: 16,928 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,928 NC	Quote: This'll get you in the ball park. http://www.wallaceracing.com/header_length.php Interesting. I don't have any dyno data on my engine so I guessed 107% Volumetric effeciency: 4.250 stroke, 4.375 bore 90 BBDC exh valve opening at 0.020" adv, 320 adv duration Shift light is set to 6700 rpm. 6700 rpm, 107% VE Your Primary Tube Length is 35.47 Your Primary Tube Diameter is 2.06 inches Your Collector Diameter is 3.61 inches 7000 rpm, 107% VE Your Primary Tube Length is 33.79 Your Primary Tube Diameter is 2.11 inches Your Collector Diameter is 3.70 inches I don't know if that calc is for OD or ID (guess ID). My headers are 2-1/8 OD and 0.060 wall, so that is 2.005" ID. 1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1

Re: HEADER SIZE [Re: 440Jim] #1233614 05/15/12 04:21 PM 05/15/12 04:21 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	ALL tubing is OD

Re: HEADER SIZE [Re: MR_P_BODY] #1233615 05/16/12 09:59 AM 05/16/12 09:59 AM
Joined: Jan 2003 Posts: 16,928 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,928 NC	Quote: ALL tubing is OD Yes, but all flow calculations are ID. The Wallace web site does not say if they adjusted the flow calc for an assumed wall thickness (0.030, 0.040, 0.050, 0.060, etc.)

Re: HEADER SIZE [Re: CALSDART] #1233616 05/16/12 09:38 PM 05/16/12 09:38 PM
Joined: Jun 2009 Posts: 644 Minnesota Barnstorm mopar
Barnstorm mopar Joined: Jun 2009 Posts: 644 Minnesota	My 500in Indy 440-1 motor dynoed at 820hp 710tq and loved my 20 yr old Hooker Super Comps 2in staight 34length and 3 1/2 collector. The little old lady from Pasadena is back!

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