Mains Cables R Us. Temple Audio  Cranage Hifi Show
Results 1 to 16 of 16

Thread: 7 Port Heads

  1. #1
    Founding Member ClassikFan's Avatar
    Join Date
     Jul 2005
    Posts
     4,604
    Location
     Surrey
    Real Name
     Stuart
    Turn Table
     Michell Gyro SE
    Digital Source 1
     Yamaha CD-S2000
    Integrated Amp
     Plinius Pre/Power
    Speakers
     ProAc
    In the Hi-Fi industry?
     No

    7 Port Heads

    My son has been reading about Mini engine conversions featuring 7 port cylinder heads and asked me to explain.

    I am presuming that a standard Mini has 5 ports, 2 inlet & 3 exhaust, so the7 port one has 4 inlet?

    Can any experts confirm or deny please?
    Just coz you got the power... that don't mean you got the right.

  2. #2
    Wannabe dealer i_should_coco's Avatar
    Join Date
     Sep 2006
    Posts
     19,939
    Real Name
     Coco-san
    Turn Table
     Voyd Reference
    T/Arm & Cart
     AN Arm-3/Io Ltd.
    SUT/Phono
     AN S9/DIY LCR
    Digital Source 1
     Laptop/JRiver
    DAC
     Nadja
    Speakers
     YL Acoustic active
    Pre Amp
     Nadja DSP
    Power Amp
     Lots
    In the Hi-Fi industry?
     No
    Wtf?

    Old mini or new mini? Old ones have 2 valves/cyl. New ones will be 4 valves/cyl. Only Audi / VW / etc. use 3 inlet/2 exhaust configuration AFAIK.
    CD players - computer audio for dummies.

  3. #3
    Moderator gjm's Avatar
    Join Date
     Jul 2007
    Posts
     9,246
    Location
     NZ & loving it!
    Real Name
     Graham
    Turn Table
     Transrotor-based DIY
    T/Arm & Cart
     Tabriz Zi, SAE
    SUT/Phono
     Vacuum State JLTi
    Digital Source 1
     PC
    DAC
     Danish
    Speakers
     Impulse/Aspara horns
    Pre Amp
     SAS B11a
    Power Amp
     DIY 2A3 monos
    In the Hi-Fi industry?
     No
    Stuart - yes.
    The best hifi show in the UK today - http://www.thehifishow.com/

  4. #4
    Founding Member ClassikFan's Avatar
    Join Date
     Jul 2005
    Posts
     4,604
    Location
     Surrey
    Real Name
     Stuart
    Turn Table
     Michell Gyro SE
    Digital Source 1
     Yamaha CD-S2000
    Integrated Amp
     Plinius Pre/Power
    Speakers
     ProAc
    In the Hi-Fi industry?
     No
    Quote Originally Posted by i_should_coco View Post
    Wtf?

    Old mini or new mini? Old ones have 2 valves/cyl. New ones will be 4 valves/cyl. Only Audi / VW / etc. use 3 inlet/2 exhaust configuration AFAIK.
    Not talking valves, ports are the thing old chap.
    Just coz you got the power... that don't mean you got the right.

  5. #5
    Founding Member ClassikFan's Avatar
    Join Date
     Jul 2005
    Posts
     4,604
    Location
     Surrey
    Real Name
     Stuart
    Turn Table
     Michell Gyro SE
    Digital Source 1
     Yamaha CD-S2000
    Integrated Amp
     Plinius Pre/Power
    Speakers
     ProAc
    In the Hi-Fi industry?
     No
    Quote Originally Posted by gjm View Post
    Stuart - yes.
    Thanks gjm
    Just coz you got the power... that don't mean you got the right.

  6. #6
    Wannabe dealer i_should_coco's Avatar
    Join Date
     Sep 2006
    Posts
     19,939
    Real Name
     Coco-san
    Turn Table
     Voyd Reference
    T/Arm & Cart
     AN Arm-3/Io Ltd.
    SUT/Phono
     AN S9/DIY LCR
    Digital Source 1
     Laptop/JRiver
    DAC
     Nadja
    Speakers
     YL Acoustic active
    Pre Amp
     Nadja DSP
    Power Amp
     Lots
    In the Hi-Fi industry?
     No
    Ah... gotcha. Yeah, I remember from messing around with old minis that they had siamesed ports for some cylinders (i.e. where the firing order meant they were a cycle apart, so didn't interfere). IIRC the inlets were, and also the exhaust between 2&3 (or maybe it was the other way round?) Having separate ports would be better, but cost more.
    CD players - computer audio for dummies.

  7. #7
    Moderator gjm's Avatar
    Join Date
     Jul 2007
    Posts
     9,246
    Location
     NZ & loving it!
    Real Name
     Graham
    Turn Table
     Transrotor-based DIY
    T/Arm & Cart
     Tabriz Zi, SAE
    SUT/Phono
     Vacuum State JLTi
    Digital Source 1
     PC
    DAC
     Danish
    Speakers
     Impulse/Aspara horns
    Pre Amp
     SAS B11a
    Power Amp
     DIY 2A3 monos
    In the Hi-Fi industry?
     No
    Quote Originally Posted by i_should_coco View Post
    Having separate ports would be better, but cost more.
    About £1600+VAT for a built 7-port head. Good power though - 100bhp from a 1275 is possible.
    The best hifi show in the UK today - http://www.thehifishow.com/

  8. #8
    HiFi Dealer Wammer BD Audio's Avatar
    Join Date
     Jul 2007
    Posts
     12,899
    Location
     Malvern
    Real Name
     Jack
    Turn Table
     Acoustic Solid MPX
    T/Arm & Cart
     Audionote IO-Gold
    SUT/Phono
     Audionote
    Digital Source 1
     Mini Mac / Audionote
    Digital Source 2
     AudioGrail 301
    DAC
     Jolida Modwright
    Integrated Amp
     Puresound 2a3
    Speakers
     TuneAudio Anima
    Pre Amp
     Modwright 36.5 'DM'
    Power Amp
     Modwright KWA-150 SE
    In the Hi-Fi industry?
     Yes
    Arden 7 port heads were the classic conversion, in reality a well worked 11 stud head is much more cost effective, there are people manufacturing 16v heads for A-series blocks these days.

  9. #9
    Moderator gjm's Avatar
    Join Date
     Jul 2007
    Posts
     9,246
    Location
     NZ & loving it!
    Real Name
     Graham
    Turn Table
     Transrotor-based DIY
    T/Arm & Cart
     Tabriz Zi, SAE
    SUT/Phono
     Vacuum State JLTi
    Digital Source 1
     PC
    DAC
     Danish
    Speakers
     Impulse/Aspara horns
    Pre Amp
     SAS B11a
    Power Amp
     DIY 2A3 monos
    In the Hi-Fi industry?
     No
    I think there was a guy grafted the head from a BMW K100 motorbike onto an A-series block, too.
    The best hifi show in the UK today - http://www.thehifishow.com/

  10. #10
    Wammer
    Join Date
     May 2009
    Posts
     1,267
    Location
     Farnborough, , Unite
    Real Name
     JP
    Turn Table
     Garrard 401
    T/Arm & Cart
     AN Arm 2 Lyra Dorian
    SUT/Phono
     Art Vinyl 1 & SUT
    Digital Source 1
     Squeezebox Touch
    Digital Source 2
     Sony 555ESD
    DAC
     Kinshaw perception
    Integrated Amp
     KT88 PP & 845SE
    Speakers
     Apogee, ESL57 NS1000
    Pre Amp
     Morgan Audio S500
    Power Amp
     Leak st20 KSA50 LFD
    In the Hi-Fi industry?
     No
    K100 head has been done a few times now and is a nice upgrade to get 16 valves :-)

    The other benefit of the 7 port head is it turns it in to a cross-flow design whereby the inlet is one side of the head and the exhaust the other side (as opposed to all on the same side as per the original 5 port head).
    Benefit 1 is that it is meant to encourage better swirl and mixing in the combustion chamber.
    Benefit 2 is that you don't have a hot exhaust manifold stuck right next to your inlet manifold/carb.

    Buy him the David Vizard A series book - lots of info there.

  11. #11
    In the trade Wammer Samantha's Avatar
    Join Date
     Jul 2007
    Posts
     5,769
    Location
     North Yorkshire
    Real Name
     Samantha
    Turn Table
     Palmer 2.5
    T/Arm & Cart
     SME M2-10,Lyra Kleos
    SUT/Phono
     Sonneteer Sedley
    Digital Source 1
     Sonneteer Byron CDP
    Digital Source 2
     Laptop
    DAC
     Sonneteer Sedley USB
    Integrated Amp
     Sonneteer Orton
    Speakers
     Acoustic Energy
    Pre Amp
     Puresound L300
    Power Amp
     Puresound M845s
    In the Hi-Fi industry?
     Yes
    B16a2 conversion. Even seen it done with TBs as well (although that requires bulk head modification to fit). Lots of fun (old Mini obviously)

    Unison Research S9, much loved, seeking new home for fun and frolics with your speakers
    Palmer 2.5 Turntable
    , SME M2-10, Lyra Kleos, Puresound P10/T10 or Puresound A8500 CDP into L300/845M and out of Acoustic Energy Reference 1s

    Check out these stocking fillers

    http://www.hifiwigwam.com/showthread...m-Purité-North

  12. #12
    purplepleaser
    Guest
    Well the 7 port has the advantages of using a normal manifold and other bits so make it cheaper than the 8 port heads. Been awhile since I looked in to this as I was going to do the engine in the 60's pickup thats in the garage. Another good way for good reliability is to use a superchareger from a new mini. CArelfull of the gearboxes though, stick a twin pin diff in and it might be okay.

  13. #13
    purplepleaser
    Guest
    The best way is a bike engine in the back, supercar money for the price of a frame, engine and welding.

  14. #14
    Founding Member ClassikFan's Avatar
    Join Date
     Jul 2005
    Posts
     4,604
    Location
     Surrey
    Real Name
     Stuart
    Turn Table
     Michell Gyro SE
    Digital Source 1
     Yamaha CD-S2000
    Integrated Amp
     Plinius Pre/Power
    Speakers
     ProAc
    In the Hi-Fi industry?
     No
    Quote Originally Posted by diceman View Post
    K100 head has been done a few times now and is a nice upgrade to get 16 valves :-)

    The other benefit of the 7 port head is it turns it in to a cross-flow design whereby the inlet is one side of the head and the exhaust the other side (as opposed to all on the same side as per the original 5 port head).
    Benefit 1 is that it is meant to encourage better swirl and mixing in the combustion chamber.
    Benefit 2 is that you don't have a hot exhaust manifold stuck right next to your inlet manifold/carb.

    Buy him the David Vizard A series book
    - lots of info there.
    Might just do that, thanks Diceman
    Just coz you got the power... that don't mean you got the right.

  15. #15
    Sandra's No.1 fan. freefallrob's Avatar
    Join Date
     Jun 2008
    Posts
     6,364
    Location
     Swanwick, Derbyshire
    Real Name
     Go on have a guess.
    Turn Table
     SL1200MK2
    T/Arm & Cart
     RB301/2M Blue
    SUT/Phono
     In the RA-04
    Digital Source 1
     Philips CD850
    Integrated Amp
     Rotel RA-04
    Speakers
     Castle Durham
    In the Hi-Fi industry?
     No
    Vizards books are great

    I miss my old minis (cry). I always used the A series myself, didn't seem to be a mini without one!

  16. #16
    Wammer
    Join Date
     May 2009
    Posts
     1,267
    Location
     Farnborough, , Unite
    Real Name
     JP
    Turn Table
     Garrard 401
    T/Arm & Cart
     AN Arm 2 Lyra Dorian
    SUT/Phono
     Art Vinyl 1 & SUT
    Digital Source 1
     Squeezebox Touch
    Digital Source 2
     Sony 555ESD
    DAC
     Kinshaw perception
    Integrated Amp
     KT88 PP & 845SE
    Speakers
     Apogee, ESL57 NS1000
    Pre Amp
     Morgan Audio S500
    Power Amp
     Leak st20 KSA50 LFD
    In the Hi-Fi industry?
     No
    A few friends have commented that the swap to mid engine buggers with the handling. Short wheel base, mid engined and no weight at the front makes it a "very fast rotating understeering whirly-gig" I think was the phrase. Comments were also made about sticking in lightweight engines at the front making the buggers understeer. A friend who used to race them indicated that you had to load up the front wheels under braking to get the front turned in on a std car - reducing the engine weight therefore didn't help.

    I have no experience of driving these funny engined machines myself - main comments from a guy who ran an 8 port turbo a-series

    I have had a few minis and loved tinkering with the a-series.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •