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jyro jyro is offline


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Showing Visitor Messages 1 to 8 of 8
  1. jyro
    02-17-2015 07:36 PM
    around 398 at .570
  2. jyro
    02-17-2015 07:29 PM
    brad penn breakin and then vr1
  3. racrguy
    02-17-2015 04:57 PM
    That should be fine. What's your open pressure at? You want to make sure you run an oil with a lot of zinc in it. I run valvoline VR1 oil in my race engines and haven't flattened a cam yet.
  4. racrguy
    02-16-2015 12:18 PM
    You can also get the lifters with the .012 EDM oiling hole in the face, and that helps a bit for friction and cam life.
  5. racrguy
    02-16-2015 12:17 PM
    The DLC is really a friction modifier. I don't have any personal experience with them myself as the rules I run under don't allow me to DLC coat anything. The tool steel lifters are about 10 grams lighter than a standard performance lifter and are more suited for high RPM applications. The trick to high RPM or high spring pressure applications on flat tappets is to keep the edge of the lifter from digging into the lobe or too much spring pressure during break in. If your rules allow for a roller cam, I would do that all day every day over trying to make a flat tappet work with high pressures/rpm. The tradeoff is that they are a bit more expensive, but you'll pick up power due to lobe design and reduced friction. Long duration and high ramp rates are your friend in a race engine, if you can keep the lifter from "crashing".
  6. Mysticcobrakilla
    04-22-2014 08:10 PM
    Appreciated, but it's already been taken care of.
  7. jyro
    01-13-2014 02:47 PM
    I have a 174 roots but thanks anyway
  8. TTls1coupe
    01-13-2014 10:20 AM
    dont no what u have but i have a d1 head unit 900

About Me

  • About jyro
    started racing in oak cliff in 1965, born in oak cliff Sunset "66"
    Midlothian, 76065
    racing sometimes, fixing things, hunting
    retired & on SS,
  • Signature
    Don't worry about what you can't change.
    Do the best you can with what you have.
    Be honest, even if it hurts.

    "Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; Its inherent virtue is the equal sharing of misery" ... Winston Churchill


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  • Last Activity: 09-12-2018 08:01 PM
  • Join Date: 06-11-2001
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