just read this in Miniinfinty Forum and thought I'd Share it with you all From MORSPEED

I wouldnt call myself respectable shabs!

Square ports allow more flow and less swirl, (this is why we make the inlets square!) This is proven on the flow bench & dyno, But what is also shown is the mini exhaust ports flow too much in standard form so they do not really need touching, Again this has been tested by using STD exhaust ports, Enlarged ports, round ports and 'D' shaped ports.

STD ex ports worked well on a road & race car.
Enlarged ports made very little difference even on a full race car.
Round ports LOST power, So we had a round LCB made to match, This still did not work.
'D' shape ports are just a gimmick ive never seen a noticable difference.

All the heads i do for Pete Vickers miglias cars are 'D' shaped on the exhausts, But only because thats what he tells me to do!
In reality the exhaust ports on a race head are only so big to justify the cost, I dont think you would be too happy if you spent £1000 on a full race head that had STD exhaust ports!!!!

Now inlet shapes! again ive done many tests, Square, Round, even tear drop shapes. and nothing gets near the power that a square inlet port produces,

But to confuse things even further its where the material is left IN the head that matters not how much you can remove or how big you can get the ports.
All the power comes from the valve size and throat area known as the long and short turn.

Belive me ive spent 13 years flow testing and dyno testing heads/engines, Im just over my 1000th head ive modified.
I modify heads for so many other companys if you didnt buy the head from me direct, Theres a good chance it started life from me.

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Stop Licking the Dog...I Don't Care Who Started It

damn aye... i wonder how his heads would go against GR's???

but from the sound of it, I would love to get one of his for bricktop in turbo form!

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68matic: "i havent seen much head in my life "

So, is there enough meat in a 12G202 inlet port to make them square ?
mine are currently round.. (about 1" diameter too !)

Later
J

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202 has square ports already.

BTW GR drills the exhausts round on his race heads, I don't think anybody in Oz has get more power yet from a NA 5 porter than he has.
Well over 150HP at crank, from a 1300.

<edit> Gafmo, if those dudes you quote were right we would all be running square exhaust pipes in our LCBs..

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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.

wouldnt mind one of these GR heads,any clues on price?
as iv been told that all the power is in the head not the mind,i mean motor

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BRICKWORX RACING
872-874 South Rd
Edwardstown
SA 5039
PH: 8297 9494
FAX: 8297 7133

I have got a 202 and it has square exhaust and round inlet ports!!!
Pete

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A recent study found the average Aussie walks about 900 miles a year
Another study found Aussies drink, on average, 22 gallons of alcohol a year
That means, on average, Australians get about 41 miles per gallon

Kind of makes you proud to be an AUSSIE

Pretty sure mine is round too ......
I know i have one on the shelf with square ports, but the one on the car is almost definitely round.. (998 Cooper ? - Graham?)

J

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yes,the inlet starts round,put put your finger inside,it goes to a square when ya port them out,the idear is to make it round all the way in isnt it?

thats a photo of a crusty old 202 head[/img]

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BRICKWORX RACING
872-874 South Rd
Edwardstown
SA 5039
PH: 8297 9494
FAX: 8297 7133

12A1456 (& the 998 Clubbie smog head- CAM4180) is round, all the others are cast square. ie 202, 206, 295, 940, 1316.
Between pushrod holes & further in, that is- they are all `round' right at the manifold face.


Clubman, no- the inlets are better square, better cross section- it's the exhausts that are sometimes drilled out.
Just make the inlets bigger and smoother. FFS use Vizard's books though or you might stuff it up!

<edit> p/no of smoggy head added.

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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.

i havnt realy started,i just pissed off the beat,as was told that now the inlet will get sucked out the exhaust,and hopefully give me some flames

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BRICKWORX RACING
872-874 South Rd
Edwardstown
SA 5039
PH: 8297 9494
FAX: 8297 7133

i thought this was going to be another clubby vs morris thread..... lol

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lookin for another clubby

clubman is morris
i was about ready to fire up to

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BRICKWORX RACING
872-874 South Rd
Edwardstown
SA 5039
PH: 8297 9494
FAX: 8297 7133

Round or Square... I knew it would get a few people..You should know me better than that..

Kev by the sounds of it this guy has been Flow testing heads for 13 years of experiance..
This is why I post it Special as Mike inlet and exhaust are so large

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Stop Licking the Dog...I Don't Care Who Started It

If Mike has any $$$ left, take his motor & box down to GR and we'll throw it on the engine dyno, see wot it's got.

I'll probably run the the new 1360 on there in a few weeks.

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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.

is it using the same block at the 1310 special?
what is being done while its apart?

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BRICKWORX RACING
872-874 South Rd
Edwardstown
SA 5039
PH: 8297 9494
FAX: 8297 7133