Rod length ??

Discussion in 'PSI Superchargers Tech Questions' started by staflund, Apr 12, 2005.

  1. staflund

    staflund New Member

    Joined:
    Nov 12, 2003
    Messages:
    54
    Likes Received:
    0
    Is there any one that can help me with some ideas about how long the rods should be
    Engine is BAE 98 +100 . 4.500 stroke and 4,310 bore . pistons are Arias TA 425 . dome CC 13

    #1 wrist pinn center - Comp height : 1.561
    #2 Crown Dome heght : 0,378

    is trying to get 10,5:1 with 0,60 headgasket.

    heads are BAE stage 5
    have anyone of you raced with this combination ???
     
    #1
  2. nitrohawk

    nitrohawk New Member

    Joined:
    Dec 28, 2003
    Messages:
    1,016
    Likes Received:
    0
    The right way to get the correct rod length you want for the desired compression is to make you an adjustable length rod from and old one by cutting the beam and drilling each half and threading one half with a left hand thread and the other with right hand thread. Weld a nut in the middle so you can use a wrench to adjust while assembled in the engine. Figure the cc's you need in chamber for the desired compression and adjust the rod length for this cc. Take the rod out and measure it. I have done this on just about every engine I have built and it is always spot on.
    Bob Holley
     
    #2
  3. suthie

    suthie Jr. Dragster

    Joined:
    Mar 26, 2004
    Messages:
    7
    Likes Received:
    0
    ASSUMING:
    deck hgt-10.725 + .100= 10.825
    stroke- 4.500 x .5 = (2.250)
    comp. hgt.- 1.561 (1.561)
    rod length- 6.856 + .100(6.956)
    piston is down .058

    head CC 96
    gskt. bore 4.340
    gskt. thickness .060
    deck clearance .058
    dome CC 13
    bore 4.310
    stroke 4.500
    rod length 6.956

    comp. ratio 10.656
    I used generic spec.s to come up with these numbers. You need to check all your parts and have accurate numbers for all spec.s listed when you order your parts. ALWAYS have the information in front of you, go over everything and have them explain anything you don't understand. DO NOT use these numbers to order your rods!
    Hope this helped
     
    #3

Share This Page