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Thread: do I need forged pistions?
          
   
   

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  1. #16
    Tommie's Avatar
    Tommie is offline CHR Member Visit my Photo Gallery
    Join Date
    Jul 2005
    Location
    langraaf
    Car Year, Make, Model: '66 t-bird coupé
    Posts
    89

    I vote for custom forged!

    I used Ross custom forged flattops (0 deckheight) for my rebuild (only ones that would give me my 11 to 1 static CR wich I wanted)...

    make sure you have your specs ready, 'cause they will want to know a lot. Had the machinist bore the block to the Ross spec sheet, wich accompanied the pistons.(some minor clearance differences, depending on the use, like naturally aspirated or blown...you already voted for blown...so...)

    one question though...
    your intended heads are 10cc's larger and you still want a 10cc dish in the piston? how much will your CR drop then? I'm not into the blowing tech, but wasn't 8 to 1 an acceptable cr for blown motors, already?... ...(or was it 6 to 1...oh...well...now I can't even make any sense of my own ramblin' anymore... )

    Tom

    PS.
    that tractor sure put on a nice show!
    hope he has the right sponsors! (like a pistonbrand)
    Last edited by Tommie; 11-15-2006 at 12:52 PM.
    Going sideways through a bend isn't considered normal or even sane, so that's the way I like it!

  2. #17
    Matt167's Avatar
    Matt167 is offline CHR Member Visit my Photo Gallery
    Join Date
    Jan 2004
    Location
    Prattsville
    Car Year, Make, Model: '51 Chevy Fleetline and a Ratrod project
    Posts
    4,990

    Quote Originally Posted by Tommie
    I vote for custom forged!

    I used Ross custom forged flattops (0 deckheight) for my rebuild (only ones that would give me my 11 to 1 static CR wich I wanted)...

    make sure you have your specs ready, 'cause they will want to know a lot. Had the machinist bore the block to the Ross spec sheet, wich accompanied the pistons.(some minor clearance differences, depending on the use, like naturally aspirated or blown...you already voted for blown...so...)

    one question though...
    your intended heads are 10cc's larger and you still want a 10cc dish in the piston? how much will your CR drop then? I'm not into the blowing tech, but wasn't 8 to 1 an acceptable cr for blown motors, already?... ...(or was it 6 to 1...oh...well...now I can't even make any sense of my own ramblin' anymore... )

    Tom

    PS.
    that tractor sure put on a nice show!
    hope he has the right sponsors! (like a pistonbrand)
    I was going to get a newer cyl head for my engine ( bigger valves, ports, and combustion chambers ) but couldn't find 1, they would have been 10cc's bigger in the combustion chambers, 62cc instead of 52cc, which if I did I would have needed a flat top to gain 8.3:1 comp ratio, but being I'm just rebuilding my stock '67 Head, I will need a pistion with a 10cc dish to gain the 8.3:1, blower motors can varry from 6.1:1-9:1, but higher comp, less boost.
    You don't know what you've got til it's gone

    Matt's 1951 Chevy Fleetline- Driver

    1967 Ford Falcon- Sold

    1930's styled hand built ratrod project

    1974 Volkswagen Super Beetle Wolfsburg Edition- sold

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