7 Port na conversions
Turbo Mini Forums

I no this is a turbo forum but does anyone have any links or no anyone who is or has built a 7port na, just to get an idea on whats capable with them , and just a genaral interest realy.

Thanks chaps
Rick

I've not seen too many with power results,

there is John K with hos billet head, and Paul H with his reworked pierce example,

after that there is that light blue austin 1300, and there are a few guys buying them on the ausmini forum. http://www.ausmini.com/forums/viewtopic.php?t=64885

The general consensus is that it is a race head. This is because of the huge inlet ports. It doesn't produce the grunt it should. This is the AKM/Minisport version.

Well i want a KAD head i just dont have the money :(:(:(

Rick

Just thinking that would be a miles easyer conversion to do than the k1100 for my minimal skills for not a lot of extra gain

It is a bolt on job. Non of the others are. Questionably the KAD, but no.

The ports are a decent size on SC's head, I sugest you look at that, much easier to inject too with the injector pockets on the head.

Minimal skills ! No chance, your car is awesome.

"So wat we gonna do tonight Brain?"
"Same thing we do evernight Pinky!"
"Try to take over the world!"

Mmmmmmmmmm

In the 13's at last!.. Just

Stop posting porn!

If something is worth doing, it's worth doing half of.

Theres a guy on the mini forum who finished his 7 port build recently, its the billet alloy type head from med, its on the cover on mini mag this month i think.

http://www.theminiforum.co.uk/forums/index...opic=151157&hl=

I have 2 heads from Pierce..... One is like number 48 of the first 50. This is stock as it comes from Pierce with fairly rough inlet ports and the larger spark plug. The second one is the medium version (hillclimb?) from MED of the same head. Larger intake valves, nicely port matched inlets to the weber 40's, exhaust ports cleaned up, the funky new 8mm spark plugs, and MED's 1.5 rocker setup. Seems to have good pull on the top end....a bit better feel in the ass than my Calver GT spec head with the weber 45 on the short Maniflow and 1.5 swiftune rockers. One major change that is hard to compare is that I had the 286 scatter cam with the Calver head and a 276 Kent with the 7 port. Bottom end off the line is a dog....hard to even break the tires loose, but over 2500 and it lights up....I top it out at 6500.

My next thought (other than turbo of course ) is to do something like MED's Jenvey throttle body setup as it can really fine tune the bottom end that the weber's just can't seem to do and they can also handle boooooost!

I really need to get this on the dyno....

Eric
my pics.... http://www.fototime.com/inv/7AAF37CF3EFA956

Also forgot to mention that the Pierce head has room to skim to raise compression if desired.....hence the change to the 8mm plugs. Talked to Mike Pierce himself and he felt it was somewhat unneccesary, but he has guys running it at rediculous compression ratios on race cars up to 15:1...including some testing by Joe Huffaker among others.

Not sure what my ratio is at this point, but I have a 1380 setup with AE 7mm dish pistons. It is definitely higher volume than the Calver GT head. I was too anxious to get it on the car, so I did not measure volume before the install....I'll be sure to do it when it comes off again.

One major pain in the rear is the tiny plug holes...I need to find or make an adapter to do a good compression check.

Eric
my pics.... http://www.fototime.com/inv/7AAF37CF3EFA956

I'm just in the process of building my 7 port. It's the same casting as the MED one, but suppield from Webcon. It's currently been bench flowed and will be fully ported and run bigger valves suitable for fast road. I am planning to run 11-1 CR with SW10 Cam. Hoping for 110-120bhp from 2 webers (40,s)

Class C 3rd Place Avon 2011 14.18 @101mph

i bought mine from webcon and i cant recommend it, paul on here sells them at the same price but the head is ported and has man sized valves

if i could have afforded it i would have gone for the SC one but was £500 more at the time

Eric,

It might be worth putting some longer trumpets on those webers, looks like you have room!

Thanks Joe....I do have a set of the stock length as well, so I may do that now that major tuning is done. Main problem (even thought it looks like a huge gap) is that I would have needed to pull the carb completely off to fit the chokes as I was playing with that a bit...now that I have settled on the 32's, the longer trumpets would probably be good. Just need to figure some sort of filtration....

Have these on right now....

Eric
my pics.... http://www.fototime.com/inv/7AAF37CF3EFA956

why not get one direct from Pierce? I got mine at beginning of year a lot cheaper that way. Something like £900 all in, inc shipping and tax.

Thanks for the info gents, gives me a lot more to think about.

Rick

Yes i moved to the darkside

Instagram @jdm_brett

Hi Ive just got one from the states with brandnew 40 webers and linkages worked out at £1450 including post and import duties http://cgi.ebay.com/ebaymotors/ws/eBayISAP...RK%3AMEWAX%3AIT

Darren

thats a pretty good deal, including the webers and linkages too!

Makes some of the other prices for them look rather shabby without the webers!

Yes does make it look very tempting.

Rick

Rick, is this something that you are seriously contemplating?

Eric
my pics.... http://www.fototime.com/inv/7AAF37CF3EFA956

That is cheap but:"11 bolt head with option with simple drill option for 12th bolt for special applications (cooper S)"