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Re: A12 Cross Flow Head
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That's some really great mileage output!

Posted on: 6/15 19:48
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Re: A12 Cross Flow Head
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Specially from a heavy L based Z engine with no cutting out of the fat!

like designers did for the E16.

Posted on: 6/18 5:48
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Re: A12 Cross Flow Head
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Update:

I am still plinking around on this system. I have found a similar cylinder head to what the current model I am working on will look like, but will accept the Datsun rocker cover.

SC Billet has already engineered one for the English A+ engine. Its a 7 port though, and I don't see any reason to stray from that concept either.

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Posted on: 11/11 13:56
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Re: A12 Cross Flow Head
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Good to hear your still working on this.

Posted on: 11/11 19:35
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Re: A12 Cross Flow Head
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I was gifted 4 pieces of material to do these. Its just a matter of getting a proper CAM assembly within SolidWorks to cross my T's.

I bought a book about cylinder heads so I can make sure my valve seats are proper.

Once I am done with the first two I am sending (1) to Peter Mcdonnel in AUS for a beating.

Posted on: 11/11 19:40
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Re: A12 Cross Flow Head
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Matt Im sure you have thought of alot of things on this journey
but I have to pip in just in case of my conscience....


I have a cooper mini on the side and have to say the heads are
very nicely designed in terms of the water thermostat at the front
much like some older Nissan H20 and R16 fairlady OHV engines.

Would think this design feature is better as it would allow use
of common thermostats or mini parts rather than NLA nissan bits?

Mini billet head seems to stick with non angled ports to clear
the original Austin or Rover mini bonnets where a datsun would
have no issues with raised and angled inlets, just something
you might consider.

Lastly the exhaust manifold stud patterns could be
designed to suit a modern engine like the Honda D16 as the
aftermarket parts for these are dirt cheap and plentyful.
Inlet manifold Im sure you got that worked out.
Which ever way you go for exhaust ports, just allow 1 to 2mm
smaller size than header to reduce reversion rather than
match ported to suit headers.

Posted on: 11/15 3:23
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Re: A12 Cross Flow Head
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I'm anxious to see this finished and what the actual power outputs will be as the vintage rules I run under would allow me to use a cross flow head. While I've been researching an SR20 swap this would be far more appealing to me.

Posted on: 11/15 3:56
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Re: A12 Cross Flow Head
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Right now I’m working at where to place the exhaust ports. I want to be able to use factory items like the rocker arm assembly instead, but the passages for the push rods are challenging me currently.

I can guarantee nothing on the market will fit the port pattern....Sorry...

So far...

Posted on: 11/15 6:36
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Re: A12 Cross Flow Head
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Here is a picture of establishing the 12° valve angle.

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Posted on: 11/15 20:25
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Re: A12 Cross Flow Head
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how much more improvement are you hoping for vs a non crossflow race setup?

From the view of the mini head, the chamber and valve angles are not ideal for
the exhaust as they were angled that way for non crossflow ports.


Med heads for example uses larger offset rollers.....

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=339188

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Quote:
A-series experts MED Engineering are developing a new cast alloy cylinder head for the Mini, and here is an exclusive photo direct from MED. Lee from MED explains that "the photo shows the fully modified head with 6mm stem valves, titanium retainers and lash caps fitted. The rocker arms themselves we have special made with a larger offset on the rollers to accommodate the offset valves in the head.



For example Fontanas New Gen engine is still based off the chevy 4 and does well

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Quote:
Fontana’s premier product, the New Generation midget engine, based on the GM four cylinder, is the result of 25 years of on-going development. It meets the expressed needs of today’s racer. Reliability, drivability, a wide, smooth power band, lightweight, best left side weight in the industry, and most importantly, an engine that can win any race – a Championship engine!


Id say the gains for just going crossflow with no hemi chambers like the E15 is an expensive
and not hp increasing exercise except better packaging for boosted apps and looks great!

Mini as you know also has the bmw head kit which is superior in every way to 8v crossflow heads
packaging is the same issue as carbs hit the mini bonnets in either ohv or ohc layouts.
The BMW head looks factory and fits nicely even in mini hoods when boosted.
http://www.dep-o.co.uk/features/ultimate-a-series/

The Mazda Miata head conversion is possible as you know but water and oil galleries need
massaging, later heads have better angled ports and improvements compatible versions to
A series blocks dont.

Maybe a Miata head in billet with better ports like on the ZC head with matched oil and water
passages would make an A series an easy 200hp engine that revs with no pushrods clunking around.
There would be a Japanese market to consider as they like bolt on kits that offer more than what
hss already been tried and available from 8 valves. You would then just use mazda aftermarket
parts for easier overall costs and headaches for the consumer.

Custom one off everything destroys more than one project in due time as it limits the market

Posted on: 11/16 0:47

Edited by D on 2018/11/16 1:58:23
_________________
https://www.youtube.com/watch?v=FEheU28ea3c
Give me control of a nations money supply and I care not who makes the laws - Mayer Amschel Rothschild

Politics not the oldest profession yet same result http://www.anarchistmedia.org/pdf/The-Anzac-Myth.pdf
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