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feralsprint
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PostPosted: Sat Jul 23, 2005 11:08 am 
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well I guess untill someone gets a 7 port into there hands and on a flow bench its all just rumour, I remember hearing the same things said about the 8 ports in the early days and that proved to be very wrong, I remember when Neil Mason first fitted an 8 port to his sports sedan quote " from 0-6000 I cant tell any dif but from 6 -10,000 farken hell "

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smac
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PostPosted: Mon Jul 16, 2007 8:46 am 
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Just to dig up an OLD thread.....has there been any progres on this? Who now has one? What's it like? Did the port size question get aswered? Any local manufacturers?
Huh? Well? 8)
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smac
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PostPosted: Tue Jul 17, 2007 6:19 am 
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Nobody? Nobody at all? :roll:
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mini13
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PostPosted: Mon Jul 23, 2007 3:30 am 
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hi, happened across this thread by chance.

I have a 7 port, although its not yet running,

I can confirm that the inlt ports have been made smaller by about 5-6mm,

Bascally where as they used to take 45mm carbs they are now cast for 40's, as cast the ports in mine were 39mm at the face.

I had the head work done by stuart gurr at vmax scart.

here is a link to my project, note it has a turbo.


http://www.turbominis.co.uk/forums/inde ... tid=119064
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gafmo
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PostPosted: Mon Jul 23, 2007 10:23 pm 
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drmini in aust
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PostPosted: Mon Jul 23, 2007 10:51 pm 
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Very noice Jimbo, but that's the Elder 8 port. In Dean Canto's truck. 8)

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gafmo
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PostPosted: Tue Jul 24, 2007 10:07 am 
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7 ports 8 ports...whats one more heheheh

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smac
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PostPosted: Tue Jul 24, 2007 10:17 am 
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" ports 8 ports...whats one more heheheh"

About 2 grand :lol:
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clubmn
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PostPosted: Wed Aug 15, 2007 1:14 pm 
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progress?

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drmini in aust
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PostPosted: Wed Aug 15, 2007 7:34 pm 
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I've heard of none... but-

My 2c- why pay freight etc on a `yet to be proven' cast iron head from UK, when you can have a CNC machined 8 port alloy head, with porting developed by Graham Russell, made here in Oz.... 8)
It's called an Elder. :wink:

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jbeenz
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PostPosted: Wed Aug 15, 2007 7:51 pm 
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drmini in aust wrote:
I've heard of none... but-

My 2c- why pay freight etc on a `yet to be proven' cast iron head from UK, when you can have a CNC machined 8 port alloy head, with porting developed by Graham Russell, made here in Oz.... 8)
It's called an Elder. :wink:


and its cheeeep! and comes with a bling rocker cover...which is what counts 8)

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Morris 1100
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PostPosted: Wed Aug 15, 2007 7:58 pm 
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I was reading a book about the design of the A-series engine. The book includes an interview with Mr W.V. Appleby the Chief Designer, Power Units, BMC.
He talks about the design of the A-series and says this about the ports...
Quote:
We have never found any disadvantage in using a siamezed inlet port, In fact it appears to have an advantage in that the volume of the induction system is less than that of separate ports, and therefore can be a quicker response to any demand from the accelerator. A siamezed exhaust port, however, is not desirable, and its disadvantages can only be overcome by using first-class exhaust materials.


So according to the original designer the exhaust port is the weak spot. So the 7 port head must be a good design because it gives more power and still manages to keep the weak spot. 8)
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drmini in aust
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PostPosted: Wed Aug 15, 2007 8:31 pm 
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What he's saying is technospeak for "the #2 and #3 exhaust valves run hotter" with the siamesed port. This is true and I've heard it before, by others... can't remember who. Phil Irving maybe?

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smac
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PostPosted: Thu Aug 16, 2007 6:04 am 
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The Elder is cheap?? First time I've heard it c alled that :lol:
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DOZ
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Morris 1100 wrote:
I was reading a book about the design of the A-series engine. The book includes an interview with Mr W.V. Appleby the Chief Designer, Power Units, BMC.
He talks about the design of the A-series and says this about the ports...


What is the name of the book?

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