• Welcome to SVTPerformance!

Cobra Jet manifold reworking

Discussion in 'Engine/Tuning' started by 01bluesnake, Aug 6, 2013.

  1. 01bluesnake

    01bluesnake Authorized Vendor Authorized Vendor Established Member

    Messages:
    3,431
    Joined:
    Apr 19, 2009
    Location:
    chicago burbs Des Plaines
    I picked up my CJ manifold this morning from Mike (86merc) and had a few talks with how poor the final product casting looked. At that point and checking it out more, i decided to make this thread for pre and aft pics of when i clean up the runner outlets and smooth the valley at the intake mouth. I'll keep the thread updated with pics and like my last ported manifold thread will also provide dyno runs very soon. I may even have the chance to compare to a stock unit as mike also picked one up which be an awesome comparison. we will be doing a big manifold test once again coming up between a stock mani to boss to CJ to cleaned up CJ on his car this time to keep numbers consistent from gains. We also will have a few different FRPP throttle bodies to test. For now i just wanted to make a thread for before and after reworking purpose. :beer:

    Drew

    Prior to clean up

    013_zps5172b8c8.jpg

    014_zps492cf8f4.jpg

    009_zps4502e172.jpg

    011_zps9ef1bc9d.jpg

    012_zps37bbcb9a.jpg

    010_zps23f2153c.jpg

    008_zpsddc67395.jpg

    006_zps81381058.jpg

    007_zps160a1245.jpg

    Started at the T body entrance by smoothing down any heavy cast lines.


    004_zpseb8d2a38.jpg

    005_zps96d721b6.jpg

    003_zps1d006038.jpg

    One thing that i just caught as i was removing the runner gaskets is that there was a pretty good size casting lip that went above the actual manifold sealing surface. Would this of caused a problem with a vacuum leak from less pressure on the gasket, not likely, but didn't want to keep the manifold from sitting as flat as possible to the head. Took it off with a flat file across the runner flange and took off any debris left with some sand paper.

    Before

    001_zps12c8dbc8.jpg

    002_zpsb1ec14dd.jpg

    After

    006_zps9c1d6fd7.jpg

    007_zpsb9d6b780.jpg

    008_zps018e7956.jpg

    Filled the opening void after sanding/scuffing the surface with motorcraft silicone. I choose it because it does flex slightly but is super strong and will not degrade from temps or oil/fuel contamination.

    007_zps5975882f.jpg

    005_zpse262de57.jpg

    006_zpsd37d74a1.jpg

    Cleaned up all the port opening as some of the casting look to of gotten shifted upon process. It created wall sides at the head flange with sharp walls that didnt line up. Also smoothed down the fuel injector housing with a lot less blend area.

    Stock uncleaned port vs cleaned up port

    001_zps73f76444.jpg

    004_zps379575d2.jpg

    All ports finished

    003_zps40f943aa.jpg

    002_zps26bf3e2c.jpg

    009_zpsaeb36eb9.jpg

    008_zps96b6efa0.jpg

    010_zpsc45ec8ea.jpg

    Manifold done and ready to be bolted on :rockon:

    011_zps18124361.jpg
     
    Last edited: Aug 8, 2013
  2. NickSezz

    NickSezz Member Established Member

    Messages:
    837
    Joined:
    May 8, 2012
    Location:
    NJ
    This is the reason why it was recalled. They had problems with the parting lines separating or something. It would be interesting to compare this casting to the new one, but they keep pushing back the ship date. It is not at the 16th of this month...
     
  3. 01bluesnake

    01bluesnake Authorized Vendor Authorized Vendor Established Member

    Messages:
    3,431
    Joined:
    Apr 19, 2009
    Location:
    chicago burbs Des Plaines
    This actually is the new manifold lol, it was just released and came in yeterday.
     
  4. Rebel302

    Rebel302 Member Established Member

    Messages:
    196
    Joined:
    Jun 5, 2012
    Location:
    In the 90s
    Actually, I just received mine from FRPP a few days ago...doesn't look much different from that one honestly...hmm :dw:
     
  5. NickSezz

    NickSezz Member Established Member

    Messages:
    837
    Joined:
    May 8, 2012
    Location:
    NJ
    :uh oh:

    We have been waiting patiently for the ones we have on order...I was hoping to see better than this.
     
  6. darreng505

    darreng505 New Member Established Member

    Messages:
    1,314
    Joined:
    Dec 28, 2012
    Location:
    Washington, DC
    I'll wait until after the second recall.....:(
     
  7. Mr. Freeze

    Mr. Freeze New Member Established Member

    Messages:
    3,794
    Joined:
    Aug 13, 2004
    Location:
    south texas
    im waiting for the 3rd recall :(
     
  8. 01bluesnake

    01bluesnake Authorized Vendor Authorized Vendor Established Member

    Messages:
    3,431
    Joined:
    Apr 19, 2009
    Location:
    chicago burbs Des Plaines
    Lol, ya wasn't very impressed with the finish either. I'll clean it up, should come out fine, and will have pics up of what was touched.
     
  9. kcsvt94l

    kcsvt94l 1D 10 T Error Established Member

    Messages:
    1,755
    Joined:
    Feb 14, 2007
    Location:
    Kansas City, MO
    460-500 WHP depending on fuel/tune/TB
     
  10. 86merc

    86merc Member Established Member

    Messages:
    956
    Joined:
    Feb 26, 2009
    Location:
    Il
    I would love to see one of the prototypes. They looked great on the outside. Wonder what the ports and throttle opening looked like.

    [​IMG]
     
    Last edited: Aug 7, 2013
  11. 86merc

    86merc Member Established Member

    Messages:
    956
    Joined:
    Feb 26, 2009
    Location:
    Il
    btw, These have an engraved number on the under side of the runners. I would assume they are some type of production numbers to track them. It will be interesting to see if later numbers start to have better quality.
     
  12. 01bluesnake

    01bluesnake Authorized Vendor Authorized Vendor Established Member

    Messages:
    3,431
    Joined:
    Apr 19, 2009
    Location:
    chicago burbs Des Plaines
    The pre production unit definitely looked nice. Makes me want to spray mine gloss black lol. I think these must of been rushed to get them out which is why they look rough everywhere around the manifold. Either way more more concerned with how well it works for the street and track. Can't wait to get out.
     
  13. Blazer707@TBR

    [email protected] Master Ford Tech Authorized Vendor

    Messages:
    4,313
    Joined:
    Aug 19, 2012
    Location:
    Bay Area
    Looking forward to see the track results.

    -Thomas
     
  14. Sean@LethalPerformance

    [email protected] Authorized Vendor Authorized Vendor

    Messages:
    531
    Joined:
    Sep 20, 2012
    Location:
    Palm Beach
    Tuned I for this one, I almost pulled the trigger on this today, but I'm waiting till ford racing comes out with the cai at the end of the month so I don't pay an arm and a leg for a custom fabricated one.. Bought my gt 500 tb today, so getting the ball rolling
     
  15. 01bluesnake

    01bluesnake Authorized Vendor Authorized Vendor Established Member

    Messages:
    3,431
    Joined:
    Apr 19, 2009
    Location:
    chicago burbs Des Plaines
    Me too :banana:

    I'll be making up a CAI for me and mike since i do that kind of stuff very often which helps. Making one really shouldn't cost more than a JLT or FRPP once released. Figure ill probably have $150 in parts using nice aluminum piping, slot maf flange, Amsoil filter, clamps, coupler, and about $100 in labor of fab and welding time. Also just got in my FRPP T body today :beer:

    *Also added more pics with comments of some progress
     
  16. corysmach1

    corysmach1 Active Member Established Member

    Messages:
    4,386
    Joined:
    Mar 22, 2004
    Location:
    Circleville, Ohio
    Cant wait to see results...depending on how your custom CAI goes maybe you could make me one lol.
     
  17. 01bluesnake

    01bluesnake Authorized Vendor Authorized Vendor Established Member

    Messages:
    3,431
    Joined:
    Apr 19, 2009
    Location:
    chicago burbs Des Plaines
    I have no problem making them for guys if needed. Just got the order placed for all the parts, should be in next week as the air filters are coming direct from cali. I wanted a very high quality filter, dry with excellent flow while having a great filtering ability. Also wanted one that had an internal velocity stack to help straighten the air flow before entering the maf areas from going around a Sharp corner found on most filters. It's made by Amsoil for a different company around their specs. Should come out really nice and pics of that by next week pending part arrival.
     
    Last edited: Aug 7, 2013
  18. Blazer707@TBR

    [email protected] Master Ford Tech Authorized Vendor

    Messages:
    4,313
    Joined:
    Aug 19, 2012
    Location:
    Bay Area
    I would be interested as well on buying one from you after yours is tested.
     
  19. 01bluesnake

    01bluesnake Authorized Vendor Authorized Vendor Established Member

    Messages:
    3,431
    Joined:
    Apr 19, 2009
    Location:
    chicago burbs Des Plaines
    No problem at all, should have dyno testing done with gains by the 17-18th.
     
  20. corysmach1

    corysmach1 Active Member Established Member

    Messages:
    4,386
    Joined:
    Mar 22, 2004
    Location:
    Circleville, Ohio
    That sounds great! Looking forward to this test!
     

Share This Page