oldkawboy
Needs a job
Posts: 2125
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posted December 10, 2004 03:47 PM
Y2KZX12R....
Hey Jim,
Got a 502 question I need some help on, please contact me at DMILLHOLLAND@TVA.GOV
Thanks,
Dan
  
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osti33
Needs a job
Posts: 2973
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posted December 10, 2004 05:38 PM
 Edited By: osti33 on 10 Dec 2004 17:39
Post your question. I'm sure there are other car junkies here too. Myself included.  Hopefully you are talking about a 502 chevy...Wouldn't I feel silly.
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BA
Pro
Posts: 1592
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posted December 11, 2004 07:46 AM
who needs a Rat anyway??? Torque-Schmorque!!!
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oldkawboy
Needs a job
Posts: 2125
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posted December 11, 2004 12:25 PM
Was wondering if the 502 Chevy with the "D" style exhaust ports took a special header?
Thanks,
Dan
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your car is slow
Needs a job
Fuck Nitrous...Got Boost?
Posts: 4089
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posted December 11, 2004 03:04 PM
LT1s are D shaped as well...while I have seen some specific "D shaped" headers made for them...most people I know run regular round headers. (obviously need to get ones that are large enough to fit over the whole D 
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Do not taunt happy fun ball!
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osti33
Needs a job
Posts: 2973
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posted December 11, 2004 04:24 PM
YCIS is right on the money. Regular headers will work just fine. Like he said just make sure they are large enough to fit over the whole exhaust port.
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Spyral
Pro
Unpredictable individual.
Posts: 1071
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posted December 11, 2004 09:15 PM
Open headers are the only way to go.
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Now, I am become Death, the destroyer of worlds.
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oldkawboy
Needs a job
Posts: 2125
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posted December 12, 2004 05:20 PM
Thanks for the replies guys. I kinda figured the standard tubes would be alright but was wondering if there would be a performance advantage with a matched tube.
Thanks again....
Dan
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted December 13, 2004 11:10 AM
Back when I was working with the very first D port Rat heads from GM R&D on the aluminum 495's in the Can Am cars we did a fair amount of dyno testing with the header flange/transitions. If I recollect correctly there was a small peak power advantage in matching the flange and smoothing the transition but that it was a disadvantage (also very slight) in the midrange torque (probably due to the loss of anti reversion effect).
Doug
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted December 14, 2004 03:16 AM
Edited By: Y2KZX12R on 14 Dec 2004 16:51
hey dan, Sorry for the delay i just got back from DC. I was at the 1st aniv. of the Hazy hangar. Man what a place!
Anyway, i used a set of Hooker 67 chevelle comp headers, the ones they have been making for almost 40 years. I didnt dyno this 502 so i cant say for sure what headers work best with this engine. The heads on the zz-502 are made by Edelbrock for GMPP. they are slightly different that the Edelbrock version. mainly in the intake port volume. Like doug said there is a small increase in d port headers near the peak hp area. but its small.
The head bolts on the zz-502 are a problem with most headers. I had to grind the headers about 1/8" at the flange to clear one head bolt on each cylinder. GMPP uses a special tall bolt with a hardened ground washer under it that causes the problem.
I have a picture if you want to see what i'm talking about exactly.
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Y2KZX12R
CompetitionCNC.com
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted December 14, 2004 11:43 AM
Y2- You an airplane guy? I went to Hazy just after the grand opening last Dec.
My screen saver is mostly pics from there. Got some great ones. I love that Napier Sabre engine.......
Doug
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oldkawboy
Needs a job
Posts: 2125
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posted December 14, 2004 02:10 PM
Jim,
Thanks for the info. I understand what you're talking about so don't bother with the pictures, thanks though.
We're getting ready to set a 502 RamJet into a truck real soon!
I appreciate yours and everybodys advice.
Dan
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted December 14, 2004 05:04 PM
Edited By: Y2KZX12R on 14 Dec 2004 17:05
Dan, I emailed ya... what year truck? Its too bad that injection is so tall, it wont fit under most car hoods...
Yea Doug, my father graduated from Embry Riddle in 53(?)before going into the airforce. So I was introduced to airplanes at a young age.
Those RR v12's give me wood. How about that cut away R4360...
Was the bearcat there last year?
How about the grummen goose? Thats what i need!
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Y2KZX12R
CompetitionCNC.com
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted December 15, 2004 07:45 AM
Y2
The San Diego Air Museum has a cut-away Bristol Centaurus (sleeve valve 14 cyl)
that will knock you over (well at least freaks like you or me.....)
Go to http://www.enginehistory.org/ for some really neat stuff. I get their quarterly newsletter.
Doug
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted December 16, 2004 06:24 AM
Edited By: Y2KZX12R on 23 Dec 2004 02:58
Doug, I was at the san diego air museum in 2000, it was a nice place. quite alot of unusual stuff.
The New England air museum in CT has a Chrysler inverted v-16 that is quite rare. I dont know if it ever entered production but it is quite large.
If your ever in CT its worth a look. They have a hawker typhoon as well as some other rare stuff.
Its right next door to Bradley international airport in windsor locks.
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Y2KZX12R
CompetitionCNC.com
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