Headers for my 499" B1MC headed Bonneville bullet
#2608205
01/17/19 06:38 PM
01/17/19 06:38 PM
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Joined: Oct 2009
Posts: 248 near St Petersburg, FL
Lifsgrt
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Anybody here using the Pipemax app, or other software to build headers? I have a coupke recommendations from Koeffel's Place, but since it is an endurance application and kind of odd I'd like to run the numbers. Mr_P_Body Mike offered a while back, but I didn't have the numbers I needed at the time and he hasn't been on here in several weeks, hope he is ok. If you can and care to help, please let me know. Thanks, Jerry -numbers below
volumetric efficiency if known -unknown, but estimating 105%? Your guess is probably better than mine. bore 4.500 stroke 3.915 rod length 6.7" compression 14.9:1 peak hp rpm - hasn't run, say 7500+- valve diameter 2.40 Ti Int, 1.78 Ex valve stem diameter .3142" valve lift .879 Int @1.75, .850. Ex @ 1.70 T&D rockers duration @ .050 282 Int, 303 Ex LSA 114 degreed center line 112 flow of the heads Lift. L/D Int. .500 .208. 357 .600. .250. 394 .700. .292. 425 .800. .333. 443 .900. .375. 454 1.0. .417. 456 Lift. L/D. Ex .500. .281. 243 .600. .337. 274 .700. .393. 299 .800. .449. 312 .900. .506. 319 1.0. .562. 336 exhaust port length of head- 2 7/8" measured as far into the port as I can get a tape measure past the valve stem to the far side of the pocket, to the bottom of the port exit as installed.
B3 1969 Charger R/T SE, 440/727 with 3:91s running 11.07@120
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: Lifsgrt]
#2608268
01/17/19 09:20 PM
01/17/19 09:20 PM
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Joined: Jan 2007
Posts: 8,042 Mt Morris Michigan
mopar dave
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master
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Here ya go. Didn't know your ex centerline length, so 3.2 is the default.
Last edited by mopar dave; 01/17/19 09:22 PM.
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: camastomcat]
#2608341
01/18/19 12:02 AM
01/18/19 12:02 AM
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Joined: Oct 2009
Posts: 248 near St Petersburg, FL
Lifsgrt
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Hey Tom, they said I'm overthinking it...they gave me some sizes and lengths and set build them and they would be fine.
B3 1969 Charger R/T SE, 440/727 with 3:91s running 11.07@120
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: mopar dave]
#2608346
01/18/19 12:12 AM
01/18/19 12:12 AM
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Joined: Oct 2009
Posts: 248 near St Petersburg, FL
Lifsgrt
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Thanks Mopar Dave, really appreciate your time. Is that Pipemax software or something else? Hope those hp numbers are a little pessimistic, I was hoping for 950hp+ with good tq numbers. I should know sometime this year! The numbers are about the same as Koeffel's team provided...guess they've done this before!
B3 1969 Charger R/T SE, 440/727 with 3:91s running 11.07@120
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: mopar dave]
#2608351
01/18/19 12:19 AM
01/18/19 12:19 AM
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Joined: Oct 2009
Posts: 248 near St Petersburg, FL
Lifsgrt
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Mopar Dave, couple more questions. What constitutes a "tuned" collector? I am considering a merge collector into a straight exit (non-megaphone) vs a formed straight collector. Also, do you kmow if the collector has to be straight, or is it only the length and diameter that is critical? I want to do side exhaust old school NASCAR style to help deflect some air around by rear wheel openings with the tips just behind the door openings. Trying to break a 237.3+ mph record. Thanks.
B3 1969 Charger R/T SE, 440/727 with 3:91s running 11.07@120
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: Lifsgrt]
#2608375
01/18/19 01:10 AM
01/18/19 01:10 AM
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Joined: Jan 2007
Posts: 8,042 Mt Morris Michigan
mopar dave
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Someone here knows more about that than I, but merge collectors need to be tuned to your combo on a dyno. I tried some $600 merge collectors once without dyno tuning and found nothing on my slip. Those things sure are not cheap. oh yeah pipemax
Last edited by mopar dave; 01/18/19 01:10 AM.
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: mopar dave]
#2608429
01/18/19 03:35 AM
01/18/19 03:35 AM
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Joined: Oct 2009
Posts: 248 near St Petersburg, FL
Lifsgrt
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Thanks, I was tracking the same about having to be tuned significantly to your combo. Man, they are cool looking though (when you are under the car to see them)!
B3 1969 Charger R/T SE, 440/727 with 3:91s running 11.07@120
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: jwb123]
#2608576
01/18/19 02:12 PM
01/18/19 02:12 PM
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Joined: Jan 2003
Posts: 4,074 Shelby Twp. Mi
HardcoreB
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I have built several headers using pipemax software, it works really well. If you have the room and take the time, I see improvements by building the step headers. I like fenderwell style headers because it makes stuff easy to work on, so I just choose a longer harmonic, and again it always makes good power. I personally have had good luck on my drag car with the old style Hedman 4 into 2 into 1 style collectors which make more low rpm rang torque. My racing buddies made fun of my old school collectors so I tried some of the merge style and the car slowed down. I would think on a land speed car you would want just a good 4 into 1 standard style collector. And on the projected HP numbers, most of the engines I build come up at the average HP number generated by pipemax. I also use performance trends engine software and it hits within 10% error when I dyno the engines. I agree that pipe is a good tool but, I haven't reviewed the inputs to know that it is giving an appropriate 'output' but at a glance I noticed it recommended 2" initially...that is too small!...also I noticed AT A GLANCE that it is only predicting a peak of 925ish HP and that is IMO, not accurate.
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: Lifsgrt]
#2608629
01/18/19 03:37 PM
01/18/19 03:37 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
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I’ve never used that program, but I’d try tweaking the inputs of VE and peak rpm until the predicted flow requirements get closer to the actual head flow. The current read out is only looking for a head flow capacity that’s 50cfm lower than what’s available.
Based on the old superflow formulas, a 499 with heads that flow in the 440 range should be able to peak in the 8400-8800 range.
Using the 387cfm number the program spit out puts the estimated peak at 7400-7800.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Headers for my 499" B1MC headed Bonneville bullet
[Re: Lifsgrt]
#2608657
01/18/19 04:28 PM
01/18/19 04:28 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
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I Live Here
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So. Burlington, Vt.
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Like I said........ never used the program....... but the head flow numbers are in the first post.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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