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Thread: 7 Port Heads

  1. #1
    Founding Member ClassikFan's Avatar
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    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?
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  2. #2
    Price Discovery Bitch i_should_coco's Avatar
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    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.
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  3. #3
    Moderator gjm's Avatar
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    Stuart - yes.
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  4. #4
    Founding Member ClassikFan's Avatar
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    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
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    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
    Price Discovery Bitch i_should_coco's Avatar
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    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.
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  7. #7
    Moderator gjm's Avatar
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    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.
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  8. #8
    HiFi Dealer Wammer BD Audio's Avatar
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    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
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    I think there was a guy grafted the head from a BMW K100 motorbike onto an A-series block, too.
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  10. #10
    Super Dooper Wammer
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    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
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    B16a2 conversion. Even seen it done with TBs as well (although that requires bulk head modification to fit). Lots of fun (old Mini obviously)

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  12. #12
    purplepleaser
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    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
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    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
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    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
    Everything is awesome.... freefallrob's Avatar
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    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
    Super Dooper Wammer
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    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.

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