hat efficiencies

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by caseyspradlin, Aug 27, 2018.

  1. caseyspradlin

    caseyspradlin Member

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    combo: 526 BBC brodix block/heads. littlefield 1471 HHR (probably 90's vintage). Enderle BIRD catcher hat. k valve. set up by gore. 30%OD.

    I am at that 30# boost mark I have heard not to exceed with standard BBC block configuration and I need to be a little faster.

    Question: Would a different hat offer any efficiencies to my combo hat would increase HP without increasing boost?

    Open to other ideas as well.

    Thanks ITA!
     
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  2. Mike Canter

    Mike Canter Top Dragster

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    If the hat change results in horsepower change then there has to have been a boost change. I bet any change to a carbon fiber hat with a matching spacer would be an improvement over a Bird
     
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  3. Dave Koehler

    Dave Koehler Member

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    What is a standard BBC config. Cast iron oem stuff?
     
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  4. caseyspradlin

    caseyspradlin Member

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    Alum. Non cross bolt mains.
     
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  5. bandit496

    bandit496 Member

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    Remember boost is resistance to flow. What heads you using? Improved flow equals lower boost given the rest the same, the way I understand. So, even with a lower boost number, you mightt reach the limit of your bottom end.
     
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  6. GregM784

    GregM784 Member

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    You are correct. I changed heads, same cam, same OD on blower, lost 3#s of boost.
     
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  7. caseyspradlin

    caseyspradlin Member

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    Brodix BB3 solid
     
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  8. NITROBANDIT1

    NITROBANDIT1 LOST IN SPACE

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    went from a 4 hole huge psi to a carbon 3 hole picked up 3lbs boost.
     
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  9. Dave Koehler

    Dave Koehler Member

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    Bandit,
    Curious. What was the total Butterfly hole area on each?
     
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  10. Mike Canter

    Mike Canter Top Dragster

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    Wow, three pounds of boost increase. I bet the new hat matched the opening in the top of the blower better than the old one. Three pounds is a ton of boost.
     
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  11. aj481x

    aj481x Member

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    Some people would kill for that.
     
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  12. Mike Canter

    Mike Canter Top Dragster

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    Give me a gun
     
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    MaineAlkyFan likes this.
  13. gordon tarbell

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    What is compression ratio of this engine?
     
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  14. caseyspradlin

    caseyspradlin Member

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    10.5:1
     
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  15. NITROBANDIT1

    NITROBANDIT1 LOST IN SPACE

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    I cant remember easily, but it was one of those 4 hole boat injectors that psi made, I have pic of it, but don't remember measuring it. and yes there was a few adapters between it and the blower, the carbon fit right, and was more directed at the front of the blower, and yes we were very surprised!
     
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  16. Outlaw68

    Outlaw68 Member

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    I ran a 14/71 on a solid BMF head with 13.5:1 CR at 44 OD. Made 47lbs of boost and had zero issue. At 3450 lbs on a radial back then. Oddys camshaft It wasnt until we started trying to spin it above 8800 that I started having issues with the line bore.
     
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  17. andy wilfong

    andy wilfong Member

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    The std enderle bird was, and still is a great hat, the problem with it now is the openings on the blowers are shorter, so the back of the injector becomes a low pressure eddy, air like to go to low pressure areas, by closing that area off, like the big and ugly, and other similar types, it’s a 2-3 lb gain easily, there are a lot of things that make injectors better, but the best is to match the openings
     
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