7 port head

su_mark · Post by **su_mark** » Wed Feb 24, 2016 8:46 pm

I'm thinking of building up a race spec 1293 (maybe 1380) with 7 port head.

There seems to be a few options on the heads. Does anyone have any experience/knowledge/advice?

MED, Webcon, Minisport, Specialist Components, (anyone else?)

Help appreciated.

mzmini · Post by **mzmini** » Wed Feb 24, 2016 9:50 pm

I have seen a Manx 7 porter used on Mervyn Johnson's S on the an Historic Rally on the Isle of Man bloo?y quick well worth considering

Rubber Sprung · Post by **Rubber Sprung** » Thu Feb 25, 2016 7:31 am

Mark,you need to speak to Pete Crews or Mike Tarr about making a 7 port fly I've competed in petes and it's awesome .Give me a call if you don't have there numbers, Bob Bennetts

mk1 · Post by **mk1** » Thu Feb 25, 2016 9:15 am

A mate of mine has used the SC one & it works really nicely. The ports are pretty much equal & the standard of finish was excellent. The biggest drawback was it was very soft. I assume it had not been heat treated after machining.

The Minisport / Danish one, has one major flaw the massive difference in inlet tracts between the inner & outer inlets.

I have no experience of the other 2 you mention.

But as has already been said the Manx 7 port always gave superb power, I think there is a certain Beardie weirdy who has a very nice one tucked away somewhere.

I had surprisingly good results from an Alexander 7 port, but finding a good one is almost impossible & they were really designed for small bore engines anyway.

Post by **swifty** » Thu Feb 25, 2016 2:30 pm

I have recent experience of a Manx seven port . I used twin 45s with 36 chokes , 649 cam etc . As for performance what you will notice is the extra torque it gives and just that nice bit of extra grunt when coming out of a corner . ... Ken

Post by **rich@minispares.com** » Thu Feb 25, 2016 2:33 pm

the big advantage of the manx over the other heads mentioned above is that its legal to use in many applications as its based on a standard casting

a very rare bit of kit

mzmini · Post by **mzmini** » Thu Feb 25, 2016 8:05 pm

Nice bit of kit !!

steve65 · Post by **steve65** » Sat Feb 27, 2016 6:25 pm

Good way to display a couple of DU carbs eh Mark!
Steve.

su_mark · Post by **su_mark** » Sat Feb 27, 2016 8:23 pm

steve65 wrote:Good way to display a couple of DU carbs eh Mark!
Steve.

The thought had never crossed my mind!!

wil_h · Post by **wil_h** » Sat Feb 27, 2016 8:56 pm

The SC head will give the best results. But it is a s Rich says quite soft aluminium. I've used large washers on the head studs to spread the load. Ultimately you end up with a few helicoils in it.

Lakeland997 · Post by **Lakeland997** » Sat Feb 27, 2016 10:10 pm

I'm close to finishing an SC 7-port 1430 build and so far I'm very pleased with the apparent quality of the components.
I can also say that it's pretty pleasing to the eye!

IMG_4685.jpg

mk1-forum.net

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