These Pierce heads fit into a roundnose with 2 Webers on (just), but their inlet port shapes are seriously compromised compared to an Elder head.
The AKM and Minisport (UK) 7 porters have the same problem.
My money would be with the Elder head for HP potential.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

whats an elder head worth these days? do they fit in a roundie?

My engine was not built as an out and out Hp machine, but it is a great setup to drive.
Best to ring GR about the Elder Head and ask him what wheel Hp can be expected with the parts your going to use, then way up the cost differences to make your desicion.

I'm sure the Elder head is far better designed, but i am more than happy with the power/drivability and cost factor.
There would be less modifying involved with the Elder head I would think because I am sure GR has already put in hrs and hrs of research to get where it is. The Pierce head does not seem to have too much info available. You could also ring and or consider the MED version of the pierce head which I think has been developed alot further.

http://www.med-engineering.co.uk/bespok ... nder-heads

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Now with 2 extra ports!

you can get the same power from a turbo for little less & a 5port.

but then again there is a 998 7port turbo doing 180bhp pretty good for a 998 18psi though.

*edit may i add to compare heads.

Actual figure 178bhp @ 7300 998 7port
144 lbft @ 6200

This was at 18 psi, the old engine made 153bhp at 15psi (5port), this one made 164 at 15psi.

put it this way, my mate has a 1275 metro rebuilt with a phase 2 cam
doing 93 atw on 4psi boost & it cost about the same as 7port with room for more power & up the boost.

he reckons it's to much power for a small car & he races & yes he is going to turn up the boost.

eventually when i win lotto ill be going 7port supercharged & injection.

the ultimate set up would be a 16v head though, for smooth power.

Hmm i should probably try getting those photos up hey? Sorry i'm a bit slack, i've taken the photos just haven't uploaded them. I'll try and do that tomorrow.

As for hp figures, i dunno, can't help you there. But with a 1275, mildish cam with a standard head, then bolting on a pierce head that has been checked over and had the ports cleaned up a bit etc but no major work, just using the supplied jets etc in the carbs, no dyno time, the difference is really quite big. Engine revs a lot nicer now, heaps more torque and power. Essentially the car is heaps more fun now. When we get around to it, we will go around lakeside in it again and will be able to see how much it's improved lap times.

Never driven other mini's that i could detail and then compare to. But i suppose for $2.5-3k just being able to bolt it on it's quite good. I'm sure the elder head would be a step up again but you get what you pay for.

120 hp is possible Sean. There was a link earlier in the thread to a bloke in the uk and he got just over the 120 mark.
Soopercooper went from 60 to 90hp.
Horses for courses and as I said for the money it's pretty cheap really. :]

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The bitterness of poor quality (or Crappy Workmanship) remains LONG AFTER the Sweet Taste of Low Price is forgotten.

Are you guys talking crank or at the wheels?

If crank..120HP is not that hard to achieve - even with a 5 port head.



1330cc 1100S block
10.2 CR
RE13 cam
Maniflow medium bore LCB
RE5 inch intake manifold
36mm chokes
2" OD, 1 7/8" ID main pipe and straight through exhaust

See Chongs' 1330 rebuild here:
http://www.ausmini.com/forums/viewtopic.php?t=21438&postdays=0&postorder=asc&start=240

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Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484

So these are a couple of pics of my dad's car with a pierce 7port head on it. Bought it all assembled with the carb's and linkage kit etc. Had the head machined flat, ports slightly worked around the guide/seat area and general clean up of burrs, casting marks etc. There may be room for a box type air filter setup, but we are just using unifilter socks at the moment. Hope to get some track time at lakeside in the near future to compare with the standard 5 port times.

looks neat! how does it compare to the standard head?

Plugs must be fun to change

Still want one though.

Dicko

Great work!

Glad to see another one up and running.

Did a 800km trip to Rylestone and back on weekend - without a hitch. Used a bit of petrol I tell you - particularly the run from Wisemaens Ferry to Lithgow - mostly up hill.

Don't bother changing the plugs , they cost too much!

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Now with 2 extra ports!

Well Meeni, it's considerably better than a standard head (same engine specs etc) lots more torque and power, really gets up and goes now. Revs out a bit nicer too. But i can't really give you a seat of the pants comparison to something. It's just better

And yea the spark plugs are a bit painful, i wanted to check what they looked like after i first got it running and was setting up the idle and went for a couple of drives, but that idea went out the window. It seems the plugs aren't the easiest to acquire so my dad went and bought a few spare ones.

Sounds awesome, definitely a lot cheaper than an elder head, if you want max power go the elder or bimmer twinky, if you want it cheapish then go the pierce head.

Specialist components has a nice 7 port head as well.

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Simplify and add lightness

Matty, if you look at your 2nd pic you`ll notice that the ram tubes leave a lip inside where they meet the weber body,,, making that section a neat, smooth, Non-stepped transition will improve things

lookin good otherwise tho

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Fairly Brave statement don't you think?
What Data do you base these words of wisdom on???

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