Compression, Lobe Center change Tuneup?

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by Bjs344, Apr 18, 2014.

  1. Bjs344

    Bjs344 Member

    Joined:
    Sep 10, 2013
    Messages:
    152
    Likes Received:
    4
    14-71 enderle setup on a bbc bracket motor. I was pretty happy with the way all of the plugs looked at the end of the year. 32 degrees was about all it wanted. I dropped the compression from 13.8 to 12.2 and backed the cam up 2 degrees. I've got the same tune up loaded for the first outing tomorrow, wondering if I should expect it to look much different?
     
    #1
  2. underby6

    underby6 Active Member

    Joined:
    Sep 28, 2006
    Messages:
    1,185
    Likes Received:
    0
    As long as it was truly happy last year, I'd expect it to want more timing and less fuel....1.6 is a huge swing in CR. The cam change should be good, it'll make more power in the upper register. The thing may be a turd off the line with the cam change and CR change, may want to stand on the timing a bit there.

    Brandon Booher
    NHRA TAD #3
    Torque MGMT. - Owner
     
    #2
  3. Bjs344

    Bjs344 Member

    Joined:
    Sep 10, 2013
    Messages:
    152
    Likes Received:
    4
    I had to have 13 degrees of timing out for about a second to get moving last year, so hopefully I can work that back in. I was mostly concerned if I should be adding fuel for some reason. Thanks for the feedback.
     
    #3
  4. Bjs344

    Bjs344 Member

    Joined:
    Sep 10, 2013
    Messages:
    152
    Likes Received:
    4
    It seemed to like the changes. Picked up in 60' with the same timing curve, which I wasn't expecting at all. Unfortunately #5 port nozzle line came loose about 0.3 seconds before I lifted. Not sure how much carnage yet.
     
    #4

Share This Page