The Force Awakens...

Discussion in 'corvette related misc.' started by DorianL, Nov 22, 2017.

  1. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    Holley 4-bbl parts are easy to come by.
    Q-jet great but need lots of tuning parts, hard to come by especially in Belgium.
     
  2. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    Street Avenger has true 4150 screw in primary & secondary main jets.
    What You want.
     
  3. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    The Primary emulsion circuits are perfect matched for cams stock to 280 Advertised cams.

    Limit will be had at 290 -300 advertised.
    HP series or Race Carb needed.
    Q- jet only a Factory RAIV Q-jet or SD455 Q jet will only work right.
     
  4. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    Race hot cams need a Super Rich AFR at all times.
    Danger Zone Rpm. 7 k plus.

    For the money new or used a Holley Street Avenger on the Street can not be matched.
    Its an idiot proof Holley carb.
     
  5. Indycars

    Indycars Administrator Staff Member

    You did say the bushings are toast. I'm a bit confused .... is this a handling problem or sound type problem you are feeling?

    Were you able to confirm TDC? There are a few different locations for the timing pointer, do you have the right one?
    http://garage.grumpysperformance.com/index.php?threads/timing-tabs-and-indicators.1015/

    http://garage.grumpysperformance.co...op-dead-center-1-for-timing-ignition-cam.966/
     
    Last edited by a moderator: Apr 16, 2018
  6. DorianL

    DorianL solid fixture here in the forum Staff Member

    Sorry. It’s a vibration of sorts.

    The muffs are actually touching the body.

    Ugly !

    5F080D8E-A7EC-4F4B-942B-008BAEB9635A.jpeg A513A9B0-4B12-458A-9525-8B87B761EC72.jpeg B407CAB4-7C13-4E10-A8D5-EFC4D82FA3E2.jpeg
     
  7. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

    having access too a decent MIG or TIG welder, a floor jack and a lift or 4 12 ton rated jack stands,
    too move brackets and exhaust pipes would come in as a useful option, and yes a compressor and die grinder might be useful,
    but Id be very very reluctant to start clearancing to gain the room vs making the required changes,
    to the component parts being used, or too move the exhaust components so they don,t touch or rub, on the frame or body.

    http://garage.grumpysperformance.com/index.php?threads/high-flow-quiet-exhaust.10558/

    http://garage.grumpysperformance.com/index.php?threads/calculating-required-exhaust-pipe-size.11552/

    http://garage.grumpysperformance.com/index.php?threads/building-an-exhaust-system-for-your-car.1166/

    http://garage.grumpysperformance.co...abricating-sidepipe-headers.13159/#post-68643

    http://garage.grumpysperformance.co...on-side-pipes-picture-heavy.12702/#post-65193


    HINT!! HINT!

    some bolt on accessory's ,
    used on the correct application,
    just look really nice, and ENHANCE the visual appeal.

    [​IMG]

    [​IMG]
    [​IMG]
    [​IMG]
     
  8. DorianL

    DorianL solid fixture here in the forum Staff Member

    Hmmmmm. I feel the vibration in the wheel and stick shift.

    I think I’m going for start by removing the fan. It seems to me the vibration is worse now that I did the timing cover swap.

    The mufflers are definitely going to need to be addressed
     
  9. DorianL

    DorianL solid fixture here in the forum Staff Member

    Is it possible that that contact between the body and the muffler is creating all this vibration?
     
  10. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    Yes
     
  11. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    Corvette Tax comes into play.
    Exhaust can cost $900 - $5000.
     
  12. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    Straight pipe lowest cost or no exhaust.
     
  13. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    Bottom dropped out in the C3 Corvette world.
    Muscle era 1968-1970 worth the most.
    If Define by Pontiac Muscle era its 1959- 1974.
    1971 C3 Still worth decent coin.
    Market sales dictate.

    Right now after 1971 typical value is 1500-3500.
    No telling when its coming back up.

    Just Pro Tour failed.
    Market correction going on with 1975-81 Trans Ams too.
    Pro Toured converted now worthless also.
     
  14. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    Even BBC Swapped not worth much.

    Racing solves all.
     
  15. DorianL

    DorianL solid fixture here in the forum Staff Member

    Well, I pried, pushed and tighten as best I could to clear the body. I also removed the fan as I suspected it could not be centered.

    4665CCE8-8A3D-438D-B202-3B6D72F662A2.jpeg

    It’s not perfect but it really is a significant improvement.

    Now accelerating to 60 and 70 is comfortable. Staying there less so. Maybe because of the loud muffs?

    There is still a vibration but it’s not as bad.

    I’m thinking new damper, new motor mounts and maybe a look at the clutch...
     
  16. DorianL

    DorianL solid fixture here in the forum Staff Member

    U-joints seem rock solid, btw
     
  17. DorianL

    DorianL solid fixture here in the forum Staff Member

    One muff still a bit close and possibly bumping. I’ll tweak that tomorrow
     
  18. DorianL

    DorianL solid fixture here in the forum Staff Member

    Right-O !

    I think we may have found the vibration source... the TWIN vibration sources.

    I took the Corvette out for another drive this evening and found that the vibration seemed a bit intermittent - seemed to be RPM related but also more pronounced at certain speeds... I also noticed that the source of the vibration seemed to move around... including coming from behind me !

    Up on jack stands I found that middle of the exhaust pipes were bumping or in contact with the bottom of the car.

    Tomorrow I will mess with it a bit and see if I can get some clearance there. If that changes the problem, hopefully... we are there !!!
     
  19. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

    pictures that point out the issue and any changes you make, as usual would be great
     
  20. DorianL

    DorianL solid fixture here in the forum Staff Member

    Hmmmmm - the trans mount !!! replacing it must have raised the pipes at leas 1/2 inch... the mount was completely worn down !
     

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