As engine is my last mod, which will be forged piston and conrod used with darton sleeves for reliability, I am undecided as to what to do with the head as expense of head work including porting, cams and valves is perhaps the same as all my bolt on mods and cost of remap combined. With the bolt ons and remap providing more value for money.

head work here in UK seem ago be anywhere for £700 up to £1100 without valves and cams.

then the figures are not known.

some say cams add 17 bhp but is that in conjunction with head work or just a bolt on value.

then there is the cfm of the head itsef.

cnc heads here in uk state the following The standard head was put on the flow bench. With 117 CFM inlet and a quite poor 66 CFM for exhaust, the standard head is certainly nothing to shout about especially for a modern engine from BMW !!!

We set to work and the results were very pleasing. Inlet flow is up a very handy 16.6% at 139CFM but the real gains on this head are in the exhaust. Improved by a massive 57.7% to 104.1CFM. This head really will free the potential for this engine. Potential which the excellent chassis of the new mini will easily cope with.

When you look at tuning your Mini, consider this.... You will not gain more power per pound spent than fitting one of these heads. If you race these cars, this head will give you the edge over the competition. If you want a fast street car, track day car or Autocross car this head will thrill and impress you. Any way you look - its money well spent.


Yet Veicomer in Portugal show different standard and improved cfm.

 

If you have all that work done in forging the engine, you might as well go for the head work if the machine shop is good.

I'm also having the larger intake and exhaust valve doing on mine, but many people don't recommend doing it on the R56.