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Chambered heads

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BootOn
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2011/07/06 14:47:51 (permalink)
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Chambered heads

Hi

Does anyone know the combustion chamber volume of 681F chambered heads for 1300 and 1600?

Cheers
#1


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    Mk1 Lotus
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    RE: Chambered heads 2011/07/06 15:29:55 (permalink)
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    9cc
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    BootOn
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    RE: Chambered heads 2011/07/06 15:43:27 (permalink)
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    Thanks

    I don't suppose that you'd know the volume of the combustion chamber in a 1300 82.5mm 711m piston would you?
    #3

    hendo
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    RE: Chambered heads 2011/06/07 19:22:22 (permalink)
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    Hi Nick
    JPE in south Australia do a very nice 83.5 piston with 1300 bowl and deeper and wider valve cutouts in crown giving a CR around 10.5 (from memory)with 240 datsun thin rings, using std head gasket. I have used these in several engines giving 1340 or 1700 depending on block used. I also ran with flat head cos you get bigger valves without chamber restriction. I think I have 3 good ones and 1 brand new in the shed. (droped a valve seat 100ks after hardened inserts fitted, wasn't to happy about that).
    #4
    BootOn
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    RE: Chambered heads 2011/07/07 08:47:36 (permalink)
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    Thanks for the info.

    Reason I'm asking is that I'm obsessed with doing a blow through turbo set up on something. The motor i have is a 1600 bored out to 1660 with pistons from a 1300 giving the just over 10:1 CR and a chambered head would drop the CR down into the region suitable for taking a bit of boost. I realise it's a bit like putting grandpa on viagra but just the same it would be interesting to see what happened while it lasts.
    #5
    hendo
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    RE: Chambered heads 2011/07/08 07:03:25 (permalink)
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    PJ and Theo have built turbo x flows,send em a pm, Iam sure they would be able to help with info.
    #6

    Bacca
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    RE: Chambered heads 2011/07/08 19:01:32 (permalink)
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    The chambered head wont be enough if you use the 1300 pistons. You will have to use 1600 pistons and a de-compression plate to get the comp down to where you need it to be.

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    BootOn
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    RE: Chambered heads 2011/07/08 19:35:48 (permalink)
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    Back of a coaster stuff but
    1660cc = 415cc per pot
    With a chambered head:
    = 421cc per pot
    415cc 10:1 cr means a 41.5cc combustion chamber vol
    Plus the 9cc in the head = 50.5cc
    So 421/50.5=8.33 CR
    Not after a huge amount of boost but that should be enough to take 14psi wouldn't it?
    A stock 1600cc with 9:1CR would drop to 7.65CR with a chambered head losing what low end torque you start with.
    #8
    BootOn
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    RE: Chambered heads 2011/07/13 19:36:31 (permalink)
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    So does anyone have a chambered 681f head or complete motor they want to sell in the interests of science? Sydney area ideally.
    #9
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