Hi GR! Thanks for your awnser!

I think this head would be my first choice if I had the money to spend on an engine.

How would your new cam design perform with a sligthly worked (valve guide boses removed) 'big valve' 12G940? What I want is a road going engine that can pull strong and rev, but mustn't neccesarily. It sounds like it could do that job?

Best regards,
Jan

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Talking about porousity; this is a late Rover gearbox casing (DAM5626, late SPI era). Is it a railway then?

http://www.mini-mayfair.net/temp/schweizerkaese.jpg
http://www.mini-mayfair.net/temp/nochmehrkaese.jpg
http://www.mini-mayfair.net/temp/undnochmalkaese.jpg
http://www.mini-mayfair.net/temp/hauptlagerkaese.jpg

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No speakers, no bodykits, no six-inch spacers, no spak filler, no bullshit

David, with all due respect - No. I wont... lets not turn this into an online punch up... drop it.

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Click here for the Turbo Conversion Thread!

Couple of questions. Jumping the gun a bit I guess:

Is the manifold at the moment only for twin webbers?
Will this fit under a standard bonnet, or is it a long branch manifold?
If it won't fit with webbers. Could you fit Amals (as were on the 8 port heads) with a hope to fitting under the bonnet?



Thanks, this looks the duck guts at the moment and watch with great interest.

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1970 Mini Deluxe - 1275, Weber, Clive 346 cam, MS 4-pot slotted discs, Megajolt ignition Now with new improved Mambas... almost on the road
1966 Van with Traveller rear seat conversion
2008 Prado GXL
All in various states of repair...

Hi Pete, I can assure you I have no desire to allow this to degenerate into a online sh*t fight in any way shape or form. A rational informative discussion, yes.

I spoke to GR on friday and we seem to be of the same opinion that a little more understanding of the physics and calculations where we derive our infomation may be of some benefit to some people trying to understanding the complex issuses with engine design and performance.

I can also assure you that I hold GR in great esteem as he works out the figures from hard facts backed up by calculations and testing and is a" true professional" in this line of work. I also think the same of Matt,and Doc.
some people live on "folk law" others derive their information from facts and knowlege.

I have been down this road before just recently,so here ends my comments on the subject.

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Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

I am enjoying this thread very much so, as i know very little about making engines go hard and always assumed bigger is better. So reading all this im learning that this is not always the case in all circumstances.

Thanks GR, Doc, Mat and David for all your comments

Imreally looking forward to seeing these heads in there final finished ready to bolt on form that can be sold

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GR,

Is it possible to extrusion hone those heads and make the task of porting them a lot easier?

I have heard that some heads dont like the extrusion hone process due to the sharp angular bends.

Interested to find out.

Cheers,
Tricky

P.S. Simon, I'm back!

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"Not Speeding Officer..........Qualifying"

Hi Jan
The new cam will work very well with your head, during testing
we thought the head i made for it may have been giving us
a false indication of how the cam was performing so we bolted
stock std 12g940 head on and it still made 101ftlb of torque
and 104 hp but the spread of torque was not as good over the
full rpm range .
Graham Russell

Hi Dave
It will be a tight fit to fit the webers under the bonnet of the round
nose(thats why we all should drive CLUBMANS! oh sorry Just
dreaming) but any of the motor bike carbies are good 36mm or
38mm will give good torque and hp.
To get the best out of any mini be it a 5 / 7/ or 8 port they need
a manifold at least 5 to 6 ins long.

Hi Tricky
Extrusion honing has its place but not on tight turn it just
seems to take the metal off in the wrong places, in
saying that on manifolds ive had done it works very well
the only thing wrong it tends to make the runners to
smooth but this is ok if your only running air through it
as with fuel injection not carbies as the fuel tends to stick
to the walls of the manifold
Graham Russell

Hi GR

Your new cam (have you chosen a name yet) how does it compare to say your RE13 profile in terms of performance at idle, mid range and top end.

The engine in my Mini goes pretty well with your RE13 cam proile, 1360cc engine.

I also have a Riley Elf that will need an engine sooner or later, which will also be a 1360cc.

Your head looks exciting

I also miss your write ups in Mini Experience are you intending on doing more.

How about how to set up Su carbs or dizzy

Regards

Bernard

Hi Graham,

Just wondering how far off these heads are from being available?

Also (a little off topic), are your pistons available in +.020" for 1275's?

Thanks for sharing all this info with us, makes for great reading!

Andrew

Those ports look the dogs bollocks.

Hi Graham

How close is your new cam to the RE282 in my 1411cc engine?

How close is the cam/12G940 head combination to mine?

If it is reasonably close, then I could arrange for Jan to come over and have a test drive at the next slalom.

On another forum where I linked this thread, a popular member posted this


Any comments Graham?

cheers
michael mckellar

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the world is a book, and those who do not travel read only a page
66 Mini Minor sponsored by http://www.lifeonthehedge.com.au/ The Dog Harness Specialists
It was a pleasure ausmini. I'll miss all you misfits and reprobates

I have spoken to both Ken Elder and Graham Russell inregards to the history of the 8 port head in question, It is a very early 8 port head that was to be used for assessment only and to be returned to Ken, not to be sold but obviously it didn't get make it for whatever reason.

It was purchased a few years ago at a large swap meet in Victoria and stored. Now the purchaser has a use for it and it has ended up in my workshop so it can be used in their project...........

Yes this head has its flaws and now we know why. The place where the head is having the machine work completed has said it is quite a good head and once completed it will be a very good cylinder head.

Thanks to both Ken and Graham for their help and information in regards to this. Im glad we also got it all sorted out. Catch up with you soon.

Cheers Scott

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http://www.youtube.com/watch?v=nDMkVq1jRGU

Hi MICK
I have to answer your post first I LOVE A CHALANGE Bring on
the poms and ill put my money where my mouth is bring on your
8 ports and any after market head out of england and ill make
more torque than any of them and match them with hp or beat
them SAME DYNO WHERE DO WE MEET and ill put up a $1000
if some one will match it, send it to them mick
Graham Russell

I think GR may have missed this one. GR's pistons don't come in 20 over, the smallest is a little over a 60 over, can't remember exactly. Dependent on your use the Hypertecs will work in that oversize.

Cheers
Aaron

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