The great nailhead intake comparison

Discussion in ''Da Nailhead' started by 66gsconv, Mar 12, 2013.

  1. 66gsconv

    66gsconv nailhead apprentice

    Gsgtx, I will send it. I also might have another to send you this late spring. I am going to need some testing done later:TU:
    I might get to the track once but dont have a g-tech.It was 50 yesterday now its snowing like crazy today...Come on spring:pray:
     
  2. Bigpig455

    Bigpig455 Fastest of the slow....

    To be more accurate, a little over .15 and a little over 1 mph
     
  3. 66gsconv

    66gsconv nailhead apprentice

    Waiting for some test results from gsgtx on a my ported intake. I kept all 4 holes but really worked it over:Brow: Thinking its going to really work good on a street car
     
  4. gsgtx

    gsgtx Silver Level contributor

    i did test some. let me tell the guys about the engine. its the stroker engine that i just refreshed honed new rings and bearings with some oil mods. also put in a solid cam with your reworked intake. engine only has 25 miles on it so i didnt full rpm it yet,did one short burst off the line, throttle responds was great, tires burning up more torque then ever before. did one run from 3500 rpm to 5200 rpms in low gear didnt want to push it with only 25 miles on it, i will after another 125 miles or so. went to 5200 rpms nice and smooth, still putting me back in the seat so theres more there how much:Do No:. yes you did a great job on the intake:grin:
     
  5. 66gsconv

    66gsconv nailhead apprentice

    Hey Joe, glad you got it out and it runs good. I always thought the intake would lay down some low end. I want to see how it does up top. This is the intake in the flow test comparison. I am doing the same things to mine now. I should be up and running in a couple weeks. I am going to have to get new drag radials this summer:laugh::laugh:
     
  6. sean Buick 76

    sean Buick 76 Buick Nut Staff Member



    An Intake like this might work well?

    [​IMG]
     
  7. 66gsconv

    66gsconv nailhead apprentice

    Yah Sean, an intake like that will work good. Been reading about it since Burton built the first one. Been lots of talk about single plane or dual plane on a nailhead. I was going to make a single plane like that but dont know if a nailhead can use it. Am working on a dual plane now, I am just kinda slow. Although a single plane is somthing I would still like to try:TU:


    And I think a twin turbo set up would work really good on a nailhead
     
  8. gsgtx

    gsgtx Silver Level contributor

    it has 50 miles on it and can tell when it breaks in the idle goes up 100-150 rpms. did a run let it shift itself at 5450-5500 rpms pulled strong to 5450-5500 rpms. did one more run held in 1st gear pulled to 5900-6000 rpms but not with power. no reason to go past 5500 rpms.
     
  9. 66gsconv

    66gsconv nailhead apprentice

    Old thread but just wanted to add a q-jet to the mix I just got done working on. Big doc job and then ported, I think this will shine at WFO.
    1-head
    2- head with the middle upper runner
    3- head with the lower middle runner

    .... 1 ...... 2 .... ... 3
    100-70.....69.....70
    200-130...128...129
    300-175...163...167
    400-204...190...195
    500-226...208...213
    600-241...220...227

    The upper runner had some turbulence through the lift. I read once that a Edelbrock rpm performer for the sbc has about a 6 or 7 % loss on the heads flow. I would have to look at the first part of this thread but I think the stock intake has about a 21 or 22 % loss on a heads flow. If we can get it to about 9 or 10 % it should work really good. This Q-jets plenum is very big compared to my doc job square bore. Just my 1 cent for what its worth :beer
     
    Last edited: Apr 7, 2014
  10. wkillgs

    wkillgs Gold Level Contributor

    Gessler did some before/after flow tests on the Q-jet intake to determine how much to open them up. His goal was to balance the flow. I'll post his flow info here since he doesn't provide the service anymore.
    Looking at his data, and the directional flow of the runners, the poorest flowing cylinders are fed from the front 2 barrels of the carb.... right front feeds #1 (221 cfm) and #4 (218 cfm), left front feeds #2 (206 cfm) and #3 (208 cfm).

    Performing the Doc mod should increase the flow to those. The flow increase would also depend on how much you increase the size of the entry from the small front barrels into those ports.... you could take a little material out, or a lot. I don't have details on what Greg did, so I can''t tell anyone what to do there. It would take a flow bench to get the balance right.... Maybe Bob knows?
    I'll follow up with some pics of my modded Q-jet intake to better explain what I'm talking about.
    Here's Greg's data:
     

    Attached Files:

  11. wkillgs

    wkillgs Gold Level Contributor

    And my Q-jet intake. It wasn't flow tested, so who knows if I did it right!
    This shows how the airflow can be increased to the front runners by removing metal between the big rear barrels and the entry to the front runners....you can remove a little metal, or you can remove a lot. I'd guess I went about 80%, as I could open it up even more.
    0811150194.jpg 0811150197.jpg 0811150198.jpg 0811150208.jpg 0811150213.jpg

    Bob, I wanted to get the flow data to you so you could plan your mods accordingly, or even test your individual port flows as Greg did.
     
  12. Bigpig455

    Bigpig455 Fastest of the slow....

    Walt - that Intake looks great!

    I think I'm familiar with the intake Bob is working on, it was opened up flush on the primary side almost to the heat channel, even more than yours. My initial thought was the plenum was so big it would really kill low end, but I guess we'll soon see!

    Bob, did you do before and after numbers on that intake? Were the runners touched at all when you got it, or was it all plenum work? I will have to re-read the post and digest all the stats today.

    And when that intake is done, it has a purpose built carb waiting for it....a 17059247 800 cfm Q-Jet, a hybrid build with the assistance of Ken at Everyday Perf. . He did the plating, and built me a custom throttle shaft with a 66 throttle/kickdown arm on the longer M4M shaft. I did the carb, stock on the idle circuits but fully modded on the power and especially secondary circuits. it will likely still need dialing in, but this looks like a killer combination.
     

    Attached Files:

  13. doc

    doc Well-Known Member

    Greg,,,, dont get crazy with hogging out your heads... you can ruin them in a hurry.....smooth , blend, and polish.... dont take out too much metal.... btw i have several bone stock nail head heads that I will sell.... $40 each.... plus shipping...

    I have been quiet lately because of other stuff going on.... but , I bought a 2000 ranger p/u.... and am in the middle of overhauling the engine.... and it is killing me to roll around underneath the thing.... :Brow: dont get many miles to the aspirin....:laugh:
     
  14. 66gsconv

    66gsconv nailhead apprentice

    Walt, I have seen Gregs info but I could never get the runners anywhere near even. I do wish I knew how he does that. I guess that's why some people do this for a living and are good.:TU: .From what I am seeing ( I am only doing this for fun in my shed when time permits ) The lower runners have a harder time sucking in the air in the runner when the intake is being flow tested. BUT when you flow the runner on a head, upper or lower are a real close amount of cfm going through the valve. The lower middle runners flow the poorest. Andy and me have been talking and agree about the dead area on the floor of the head ( more on that in another thread later ) and the way the lower plenum exits the runner to the head must not be to bad. I struggle to get the middle lower runners up to 235 cfm and its not hard to get the back two runners to 280-300 cfm

    Rhett, I cant wait to see how your intake does as a street strip combo. I just know its gonna love the track :TU:

    Edit, I might be overthinking this, Not enough air for the cubic inch. Just open them up with positive air flow and go wfo and ..forget about it..
     
  15. gsgtx

    gsgtx Silver Level contributor

    Walt, Gessler never got those numbers in that chart. he told me he tested it wrong or his flow bench was messed up cant remember. Bob, that's why you cant get them numbers there not true numbers.
     
  16. 66gsconv

    66gsconv nailhead apprentice

    Walt, I have flowed these intakes, runner by runner and SQ bore and Q-jet. Even if you don't touch the few good runners and go crazy on the few bad ones it still don't get them close. I just did what I felt was needed on Joes and he likes it as a street/ track combo intake. I did mine the same except I already had the Doc job done on it. Hope to test it out this late spring. Like I said, I think I was looking to hard and they just need air anyway they can get it.
    Walt, by the way nice looking intake:TU:
    Rhett,by the way that is pretty also:TU:
     
  17. wkillgs

    wkillgs Gold Level Contributor

    Joe, thanks for the inside info. Hope Bob didn't spend too much time trying to get the same results. Heck, maybe Bob's intake even flows better than Gregs!
    All you guys are doing great work! Nice to see so much thought and effort going into taking the Nailhead to the next level.:TU:
     
  18. 66gsconv

    66gsconv nailhead apprentice

    OOHH, so that's how he did it :laugh:...I still think it needs air so bad that I am over thinking. Just get positive flow and GO. I might have some new news for this thread late spring hopefully. Later
    Bob
     
  19. 66 NAILHEAD

    66 NAILHEAD Well-Known Member

    Hey bob, what are you running for a air cleaner setup on that Holley carb with that spacer? There isn't much room for hood clearance. Those intakes are sure looking awesome and good flow numbers. :TU:
     
  20. 66gsconv

    66gsconv nailhead apprentice

    Dan, I use a KnN drop base with a 3" filter with the flow through top with the 1/2 inch adaptor. Same set up only 2" filter with the 1" adaptor. Very tight but does fit. Drop base controls most of the air I would think. Just happen to have the flow trough top so I am using it:TU:
     

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