blown head gasket

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by FMFC573, Oct 4, 2017.

  1. FMFC573

    FMFC573 Member

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    Hi blew head gasket melted head and block on #1. #1 cylinder never got over 750 degrees. looking at #1 egt graph it looked liked eratic roller coaster it went up then down up down several times and it looked like electrical interference only on #1 the other 7 cylinders the graphs were normal no cylinders reached a 1000 degrees any help would be appreciated
     
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  2. Mike Canter

    Mike Canter Top Dragster

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    What engine is this a hemi or a Chevy or what?
     
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  3. HootersFunnyCar

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    Too much timing.
     
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  4. FMFC573

    FMFC573 Member

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    it is a hemi
     
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  5. Bob Meyer

    Bob Meyer Comp Eliminator

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    What is the compression ratio and how thick was gasket ?
     
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  6. jay70cuda

    jay70cuda Member

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    Sounds like a detenation issue.
     
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  7. FMFC573

    FMFC573 Member

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    fuel system set up by Randy Anderson and if remember right he wanted at 11.5 head gasket .062 we have ran this set up for over 5 years with no problems we only have ran at bandimere for last 5 years
     
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  8. MaineAlkyFan

    MaineAlkyFan Member

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    Were the heads off it recently? Debris on the gasket / head / block faces could have caused a flame path area that then blew out.

    Chris Saulnier - Team Tigges
    Mechanic Falls, Maine
     
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  9. WIZBANG

    WIZBANG Member

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    Port nozzle debris ?
     
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  10. rickey

    rickey Member

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    It's happen to us twice, Brad is very reasonable on cost to weld up. After you run and get hot after it cools retorque head studs. Fatten it up.
     
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  11. FMFC573

    FMFC573 Member

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    little more info #1 temp right before he steeped of throttle 995 average temps 1019 head temp 158 manifold temp 130. #1 nozzle had no blockage it seemed pretty safe. we run at altitude great air is 8000 corrected we don't see that very often usally 9000 to 9500 and even higher
     
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  12. Mike Canter

    Mike Canter Top Dragster

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    Well let me ask you this since it is #1. Which pattern do you use when you torque the heads. Do you start in the middle and work you way out or do you do it the way BAE advises and most of us do is to start all the way out and work in. We all changed the pattern to out working in to stop blowing head gaskets.
     
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  13. FMFC573

    FMFC573 Member

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    from the middle out this is the first problem like this we have had in 20 years sleeves and head gaskets pistion rings and rods were new begening of the year
     
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  14. Mike Canter

    Mike Canter Top Dragster

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    I would then suggest that you switch to out to to middle. It will help prevent this problem. All the Promod guys I know all do it that way and nobody every has a problem with blown gaskets. Call Jeremy at BAE and he will tell you the same thing
     
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  15. HootersFunnyCar

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    Triple check your timing.
    And check it yourself, had an issue like that blew out #1 two runs in a row crew guy checked timing said it was good I checked after 2nd head and it had too much timing.
     
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  16. MKR-588

    MKR-588 Member

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    Mike , do you suggest this way for all engines, even blown SBC with cast iron blocks/alloy heads?
     
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  17. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    Outside of what has been mentioned here on timing -

    Check TDC and make sure the pointer hasn't been moved.
    If you have some sort of retard box, make sure it's not stuck in a stage or something throwing you off when you check timing.
    Make sure sleeve hasn't sunk (unlikely)
    Make sure it is not leaking oil past plug tube. This will cause detonation.
    Check fuel pump flow/pressure and make sure they are on line with what you normally run.
    Try to double check your weather station to make sure it's not giving you a false reading.
     
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  18. FMFC573

    FMFC573 Member

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    thanks for all the replys Just kooked at racepak data fuel pressure is the same as 2016 runs no timing control heads were off in the off season and run all season I plan on sending mag system to electrimotion and pump to Randy
     
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