Sectioned 8V BMW twink head
Turbo Mini Forums

A few pics of a sectioned head - I'm going to see how far the 8v head can be pushed in terms of airflow and needed to see the make up of the head - so one went under the saw today. As you can see the port walls are very thick - 8-10mm+ in most places and the deck is nice and thick too - so now I know how much can be removed from the port walls its onto the flow bench next - will put the graphs up here when I have them.
JK

If Carling made Mini engines
it would probably be like this one!

oh yes - for example on how to make an inlet port work look at the radius and length of the short turn radius in the inlet port - very nice as std.

If Carling made Mini engines
it would probably be like this one!

TOP MAN FOR SHARING THIS!!

Great stuff John!

Just think if more production heads were this good as standard!

yeah you can see why they can do a few hundred thousand miles without breaking into a sweat!

JK

If Carling made Mini engines
it would probably be like this one!

Nice one john. Just need a 16v to section now so i can do some serious porting on mine!!! Will pop over for a look tomorrow evening if your about.

ha ha, that is ace!!!

I love cutting things up

We should get togeter at one of the events and display all the sectioned items we have.

Kind of a K100 Minis Research and development Museum

That is real good John!!!

When are you going to cut up a 16v head

I was talking to john about doing the 16v head but the rarity of them and being unable to find a fooked one put pay to that, and i don't fancy hacking mine apart!

interesting ,thanks john , the exhaust port is the time consumer from the look of the port valve included angles .
regards robert.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

hehe - I'm felling in a destructive mode!!!

JK

If Carling made Mini engines
it would probably be like this one!

Glad i didn't leave my head at yours then John!! I you do a 16v one at least you will have lots of spare valves and shim buckets and a pair of cams etc.

Nice work John! And thanks for sharing the results with us.

Team Racing

That looks good as standard to me, nothing jumping off the page as shocking.

Some room for imporvement though.

What do you think aout valve sizes? Looking at mine I think +1mm should be possible for both inlet and exhaust, maybe a little more too on the exhaust side but not sure about how much more the port can give... know much more after seeing those pics ... cheers

Every day is a school day ...........

How fast and how expensive ...... the same question...

Hi Roger - this is one of the areas I'll be looking at as well - the sectioned valve seats show there is room for +1 on both if not a little more - will get some "dummy" valves turned up to assess this whilst the head is being worked to the max!

As std the airflow is circa 130cm from a 34mm valve is pretty outstanding really - I'm sure with some throat work and valve seat detailing this will climb nicely though - the graphs will go up for the stages the head goes through.

JK

If Carling made Mini engines
it would probably be like this one!

I think I may have found a source of "drop in" +1mm valves for both ... only thing that might not work out is the spring cap mounting grooves ..... I'll let you all know when I have tried it out

Every day is a school day ...........

How fast and how expensive ...... the same question...

good stuff Roger

JK

If Carling made Mini engines
it would probably be like this one!