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  1. #46
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    A well known NZ engine builder recommended I find a VL or VN block to use as base for a stroker and as Redtaxi mentioned he sonic tests and moves the bores to suit.

    Another option may be to grout the block up to the Welch plugs to help reduce bore flex.

    Quote Originally Posted by RLF View Post
    It was partial detonation from the change of locally allowed avgas to pump fuel under the European regs.
    Cheers.

  2. #47
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by RLF View Post
    It was partial detonation from the change of locally allowed avgas to pump fuel under the European regs.
    One of the changes I made to prevent the head gasket issue was I moved to 102 racing fuel
    .. expensive yes but cheaper than a teardown after a head gasket fails and fills the engine with coolant
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  3. #48
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    Quote Originally Posted by Smitty2 View Post
    One of the changes I made to prevent the head gasket issue was I moved to 102 racing fuel
    .. expensive yes but cheaper than a teardown after a head gasket fails and fills the engine with coolant
    You should be safe in that regard then.

    An interesting side note, In 1987 Les Small's team ran reliably on pump fuel (86 they continued using race fuel unlike HDT) and made more power in the process. They found the 308 to have poor cylinder head clamping and designed a better head gasket, they also ran programmable electronic ignition which allowed them to pull timing out at peak cylinder load but still have plenty left up top. This all resulted in HDT getting left behind in engine development.

  4. #49
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by RLF View Post
    ....

    An interesting side note, In 1987 Les Small's team ran reliably on pump fuel (86 they continued using race fuel unlike HDT) and made more power in the process. They found the 308 to have poor cylinder head clamping and designed a better head gasket, they also ran programmable electronic ignition which allowed them to pull timing out at peak cylinder load but still have plenty left up top. This all resulted in HDT getting left behind in engine development.
    indeed... !
    and those interested in the development side of Grp A racing then will remember that HDT were struggling at that time to get a reliable 380+ hp where as Les Small was getting 400+

    all of which culminated in Grice being the first driver to break the 160kmh average lap at Bathurst and of course in the Chickadee car ( a rocketship that was ) winning Bathurst

    the headgasket issue is an interesting one.. as I have been doing some work on my own on that (as I cannot do anything much about the clamping except bigger washers).

    I have used both the single genuine 'steel' gasket as used by MHDT in early Grp C cars plus the common MLS type we have these days but I found
    both need retorquing .. after each event. Composite gaskets don't need that ... I have tried Felpro. MACE, Duratech and genuine Holden EFI type
    and the genuine ones seem to be better at sealing, resisting the steam pocket issue and don't need sealants or special block finishes like the steel ones

    The Holden head gaskets there were on the engine when it broke did not fail .....

    Last edited by Smitty2; 28-02-2018 at 12:03 PM.
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  5. #50
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    Sorry to see smitty it really has torn itself up hasn’t it, at least u can say u don’t half do a job
    What’s the latest with ruling on the circuit for fuels? Is ethonal still ok to use? As your well aware heat is a big contributor to failure in your type of racing, running e85 or even a less mix of ethonal would dramatically bring your temps down, could easily keep the temp hovering around 165f, this along with the huge tuning margin and massive detonation prevention would help your cause heaps.
    There’s nothing wrong with hypa pistons, but I think running them hot in a circuit environment has its limitations.
    My personal opinion, don’t run hydraulic flat tap cams in this type of deal, solid flat tap with an edm lifter is the way to go, obviously a stroker motor will make more torque but up to you weather u go that way it certainly isn’t needed.
    Stay with hypas go 11.5 comp and ethonal
    Go to forged slugs go over 12.0 e85.

  6. #51
    Part of the furniture gtrboyy's Avatar
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    Wondering at what point best to consider tp block?

    Next step up starting point your looking at grout filled 4 bolt mains vn blocks(less core shift) after you've had them sonic tested.

  7. #52
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    I'm still curious. Do you think it was a thin liner that caused this?

  8. #53
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    I would go the forged piston next build, regardless of comp ratio.

    Bit lighter and more resistant to detonation, move the weak link back to the head gasket.

    Good luck next build.

  9. #54
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    Quote Originally Posted by Castiron355 View Post
    I'm still curious. Do you think it was a thin liner that caused this?
    yes...
    the cylinder wall fragments I have vary in thickness from 6mm, 7mm down to a very thin (in my opinion)
    2.2mm - 2.5mm (which really is not that thick in context of a race engine)

    other things?
    detonation? .. no I don't think so and no sign on the other pistons
    head gasket ? ... no
    piston collapse.. no and unlikely given no detonation
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  10. #55
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    Quote Originally Posted by EH179 View Post
    I would go the forged piston next build, regardless of comp ratio.

    Bit lighter and more resistant to detonation, move the weak link back to the head gasket.

    ..........
    agree 100%
    whether standard or stroker, it will have forgies
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  11. #56
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    Quote Originally Posted by gtrboyy View Post
    Wondering at what point best to consider tp block?

    Next step up starting point your looking at grout filled 4 bolt mains vn blocks(less core shift) after you've had them sonic tested.
    No need whatsoever in this case, no 4 bolt needed, grout is cheap

  12. #57
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    2.5 mm. Geez that does seem thin. First for me seeing a bore let go. So how much is a new set of liners? Or are there other factors to a blocks .condition that prevents even doing that?

  13. #58
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    Nice Job Smitty !!!
    Smashin the pistons out of a Holden V8. Its got Aussie and Manly written all over it 😎

  14. #59
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    Unless you want to chase down those GT3's (which you wont) I would stick to the std stroke. A big dollar stroker will likely punish the rest of your driveline too. Better bores and pistons would be a decent upgrade, that's what failed. Oh and a SFT cam too.

  15. #60
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    Quote Originally Posted by tokes_Vhdrift View Post
    No need whatsoever in this case, no 4 bolt needed, grout is cheap
    Donít think 4 bolt is a good investment? CRD do they with splayed caps now for under $1000

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