Steel Rods Over 20# Boost?

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by BEDNAR1320, Jan 17, 2016.

  1. BEDNAR1320

    BEDNAR1320 Member

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    Has anyone used steel rods running 20-28# boost? Putting my stuff back together soon, and have the option of going either way-Oliver Max or GRP pro material. BBC Big M billet caps, Callies Magnum crank. I ran 15-19# with the Olivers last year and the bearings look great.

    I know aluminum rods are easier on the bearings and crank.

    Just wondering if anyone has experience of using steel rods with this kind of boost.
     
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  2. BEDNAR1320

    BEDNAR1320 Member

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    Wow, 200 views and no responses.

    Opinions, anyone?
     
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  3. aj481x

    aj481x Member

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    I would use the aluminum. We have used the Olivers in blown off shore marine which is hard on parts but not like 25# boost. Another thing to consider is an aluminum rod failure a lot of times causes damage that can be repaired, steel rod usually cuts the engine in half.
     
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  4. BEDNAR1320

    BEDNAR1320 Member

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    I am going with the aluminum because of several reasons.

    The Olivers would probably be just fine strength wise, but I feel the GRP's give me a little more "cushion" if the tune up is off a little.
     
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  5. craig moss

    craig moss Member

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    Been using the heavy Olivers for 8 years @ 30# in a dragboat. Last year we upgraded to a D screw and ran 36# rods are fine. No bearing smash. Building a spare with them and bought a new set.
     
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  6. BEDNAR1320

    BEDNAR1320 Member

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    Craig, what stroke is this engine and what crank are you using?
     
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  7. craig moss

    craig moss Member

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    4.25 callies mag bbc have turned it 8600 @ 40 psi
     
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  8. BEDNAR1320

    BEDNAR1320 Member

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    That's encouraging, I run the same crank and stroke. What heads?
     
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  9. craig moss

    craig moss Member

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    Protopline 360 It's a shame Racing head service turned them into junk
     
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  10. BEDNAR1320

    BEDNAR1320 Member

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    I was running RHS heads, but started getting water in one intake port. It's going back together with Profiler solid heads.
     
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  11. BEDNAR1320

    BEDNAR1320 Member

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    I take it yours are O ringed?
     
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  12. craig moss

    craig moss Member

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    The block is heads are grooved. Dart block, Indy intake , Dribblers and ports. 98% od can go 126% but lack the ballz.
     
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  13. BEDNAR1320

    BEDNAR1320 Member

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    By dribblers you mean hat nozzles, right?
     
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  14. craig moss

    craig moss Member

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    They are basically an idle circuit for the screw. We only have 4 nozzles in the hat IMG_0592.JPG
     
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  15. BEDNAR1320

    BEDNAR1320 Member

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    OK, I've heard the term dribblers before in reference to a screw blower, but wasn't sure what it meant.
     
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  16. craig moss

    craig moss Member

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    there are 8 dribblers and 8 ports in the manifold.
     
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  17. BEDNAR1320

    BEDNAR1320 Member

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    Plus the four in the hat?
     
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  18. craig moss

    craig moss Member

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    Yes I sent you my #
     
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  19. rb0804

    rb0804 Member

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    Holy injector Batman! Who makes that thing and how is the idle with all that throttle blade area?
     
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  20. BEDNAR1320

    BEDNAR1320 Member

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    I thought I was seeing double! LOL
     
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