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  1. #1
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    Default 304 circuit/hill climb engine

    Hi all, this is my first post so please go easy on me, I have been going through a lot of posts on different engine builds for different applications and power etc.
    I cant find any that would suit my application though so I thought I would post what I want to do and see if anyone can help with info and a rough cost.
    I have a bog stock VN 304 I want to build into a track/circuit/hill climb motor, as I am relatively new to the sport I don't want mega hp just something around 300-350 hp atw.
    The engine has a harrop duel plane intake on it and I was hoping to reuse this and I really like the idea of running twin down draught weber type carbs. Ive looked at the oiling mods posted by TK and the come oiling mods and I will do something like that as well. Any suggestions most welcome. I see SMITTY2 runs a track car and would be good to hear your thoughts. Thanks Pete
    Oh and I was hoping to keep it standard stroke
    Last edited by Petehol1972; 21-04-2017 at 03:21 PM.

  2. #2
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    Budget ?

  3. #3
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by Actrol View Post
    Budget ?
    yeah my thoughts 'zactly... especially after I read this...
    and I really like the idea of running twin down draught weber type carbs


    one of the guys in the car club, has just done that on his VK




    .. including the tray, just under $2 large ( and it has NOT been dyno tuned yet)
    there goes a large part of the budget
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  4. #4
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    Quote Originally Posted by Smitty2 View Post
    yeah my thoughts 'zactly... especially after I read this...
    and I really like the idea of running twin down draught weber type carbs


    one of the guys in the car club, has just done that on his VK




    .. including the tray, just under $2 large ( and it has NOT been dyno tuned yet)
    there goes a large part of the budget
    Hmmm looks horn

  5. #5
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    Actrol I am hoping to keep it as cheep as possible and use as much as possible of the existing engine. I'm not sure of budget hoping to keep it under 10k. cheers
    Smitty, yeah downdraughts look and sound cool I was thinking more twins like the old group c cars. its going in a vk

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    $10,000 for all running gear or engine only ?

  7. #7
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by Petehol1972 View Post
    Actrol I am hoping to keep it as cheep as possible and use as much as possible of the existing engine. I'm not sure of budget hoping to keep it under 10k. cheers
    Smitty, yeah downdraughts look and sound cool I was thinking more twins like the old group c cars. its going in a vk
    A9X Toranas only ran 2 twin downdrafts (= 4 chokes) which is all they were allowed under Grp C rules at the time





    ... as did Brock's 05





    won't save much moola.. you still need a manifold to march the adaptor for the Webers (if you can find one that is... I last saw one on 105.com a couple of years ago)

    if you want to a 4bbl... try the Quaddie , it makes for a nicer circuit engine (plus the guys with Holleys hate you as you accelerate quicker out of corners than them)
    Brockie used them in his VK race car !

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  8. #8
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    Those later dual planes were "adjusted" internally.
    Slick stuff.

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    Actrol I have the running gear sorted so cost will just be for engine. cheers
    Smitty Great photo's, I was under the impression that you could run the webers with an adaptor plate to pretty much what ever inlet you choose. Let me know if this is not true.
    Thanks fella's.

  10. #10
    Do you ever leave? EH179's Avatar
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    Peter supervising Neil Burns...amazing.

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    Quote Originally Posted by EH179 View Post
    Peter supervising Neil Burns...amazing.
    Me thinks just looking on LOL

  12. #12
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by Petehol1972 View Post
    ..............
    Smitty Great photo's, I was under the impression that you could run the webers with an adaptor plate to pretty much what ever inlet you choose. Let me know if this is not true.
    Thanks fella's.
    nope... the adaptors used only match up against the std GMH 4bbl spreadbore manifold

    Even the GMH 5955 version not being the greatest.... hence all internal skullduggery back then by race teams
    with these manifolds in order to trick the scrutineers...and also make decent hp
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  13. #13
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    350 @ the tyres is very tractable
    Top to bottom;
    700 4150 E85
    1" adapter /spacer
    Dual plane - 055 / edelbrock
    Std heads and valves
    New springs @ min coils and lite retainers
    3/8 restricted pushrods
    Solid flat tappet 240 @ 050"
    108 sep with .580" net lift on 106 in c/l
    Edm lifters
    Oil gallery mods
    11.1 c/r
    1 5/8" 4 2 1 pipes
    Pistons with 043" rings
    A9L rods or whatever
    Std crank
    Good damper
    Std oil pump
    Oil cooler
    Overpriced sump
    Electric w/pump Davis Graig
    7- 10kg flywheel
    Rag clutch = smoothness
    Bosch dizzy locked
    Bosch coil
    Good for 7500rpm fun

  14. #14
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by Actrol View Post
    Those later dual planes were "adjusted" internally.
    Slick stuff.
    haha... adjusted!
    yeah... one way of saying they were cutup, modified, ported and welded back together
    all to improve airflow and mixture (and horsepower)
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  15. #15
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by Actrol View Post
    350 @ the tyres is very tractable
    Top to bottom;
    ...................
    Overpriced sump...............
    having seen too many 304/308/355 circuit engines go ....bang
    due to oil surge... the better that 'overpriced' sump has to be !
    (actually dry sump it ...if really serious!)

    Having seen one racer reduced to tears, I can vouch for this.
    A few years ago, at a PI Supersprint, one of the guys who rebuilt
    an old Grp C VH Commodore took great pride in telling everyone
    at the briefing about his new $25000 race engine (built by someone I had never heard of)

    Properly run in/tuned on an engine dyno, it was making just over 400hp.
    It sounded sweet on the track... until on his 2nd run for the day, full noise
    T12 coming onto the straight, the bottom end went BANG, the noise could be heard
    all around the circuit. Back in the paddock he was only looking to salvage the heads inlet manifold and extractors
    (even the cam was in pieces)

    He admitted getting oil surge and associated pressure drop at other parts of the track at Phillip Island
    but was not too concerned. He was now....and very upset to lose a very expensive engine
    That engine was running a VN EFI style GMH sump, no baffles gates.. or even a decent pickup

    The oil pressure gauge sits next to the tach on my car....
    Last edited by Smitty2; 21-04-2017 at 10:47 PM.
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