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Doing some stupid shit to an old datsun head

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    #61
    Wow!

    Projects:
    '90 2jz-gte 929
    '02 twin-locked TD42 GU Patrol

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      #62
      spark initiated towards inlet and chamber shaped to promote swirl
      E36 M3 12.92 @ 108.64mph, N/A 3.0L

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        #63
        Nope, chamber shaped to minimize swirl!
        Swirl wastes energy, with an inline valve engine there is always plenty of swirl, you want to keep it to a minimum & hold that inertia in the charge.
        Have a look at the shape & imagine the valve opening - look at the area between the valve and the chamber compared to the area between the valve & the seat ad the valve opens.

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          #64
          What flow numbers are you hoping/aiming for
          you cant spell advertisements without semen between the tits

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            #65
            Tk wondering if you could give me some advice on getting an alloy head welded succesfully? I made thread in the general section..
            CL valiant sedan 245 3 speed
            VH dodge utility 215 3 speed, project/ trailer puller
            74 chrysler lancer LA sedan, 2.6 EFI turbo, 230kw
            chrysler galant sedan, daily
            chrysler galant coupe- long term project
            mitsubishi starion turbo, cutties, front lip, scrapes and smashes on everything

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              #66
              Awesome dude thank you.

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                #67
                this has given me inspiration for my l20b build....
                No Power chips thanks

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                  #68
                  chamber pressure recovery - space between the valve and head shape approximates aventuri as valve liftss - thus maximising chamber pressure recovery via a better co efficent of discharge and hence cylinder filling

                  vertical valves are bettr as more wall around the circumfernec of valve - rather than a wedge/ inclined 2 valve which loses the wall on the narrow wedge end.

                  vertical valves also give better centralised compact chamber and adequate squish ( than inclined 2 valves) for better burn


                  hmmm - kewpie doll for me ?

                  edit : sorry boys need to sign up to speed talk:
                  http://speedtalk.com/forum/viewtopic...15&t=23564edit :

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                    #69
                    You've lost your mind. But I like it!!
                    CAD Automotive Paint Correction, like us on the faceballs. Discounts on all detailing and ceramic coatings for PF members

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                      #70
                      tk, have you ever done a 1600 escort x flow head?
                      I'M NOT A HOOKER BUT 20 BUCKS IS 20 BUCKS...

                      I am junkie for swedish high quality shitboxes. my latest fix is this...

                      robslothyoung - follow me on insta.

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                        #71
                        Originally posted by 260DET View Post
                        What are you up to now, please explain.
                        Off road race buggy upgrade. Planing the same engine for my C210 Coupe.
                        GURU ENGINEERING PTY LTD

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                          #72
                          Originally posted by val245 View Post
                          Tk wondering if you could give me some advice on getting an alloy head welded succesfully? I made thread in the general section..
                          Mate who has welded up more heads than I've had hot dinners, normally gets them heat treated again if there's been significant chamber work or relocation of valves, normally uses argon/helium mix too.

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                            #73
                            WAA??? Swirl is bad??



                            So Suzuki twin swirl was all bullshit? Dissapoint....

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                              #74
                              big squish area!

                              I am a Spinal and Sports Physio based in Flemington, Melbourne. Insane discounts for PF members!

                              www.showgroundsphysio.com.au

                              I also retail do high-level professional road bike fitting and retail Speedplay pedals and SMP seats - cheapest you'll find them anywhere.

                              www.neillsbikefit.com.au

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                                #75
                                With a 4 valve pentroof head swirl is almost non-existant, if you can promote a little swirl it's a good thing.
                                But we're talking inline 2V heads here, due to the intake valve sitting against the side of the bore there is always plenty of swirl, more than you want.
                                Better that energy is used to keep the charge following the piston down the bore, rather than swirling around at the top of the bore & impeding incoming charge.

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