Hello - firstly what a great site - I'm surprised I haven't stumbled across it before now its cool!
I'm the technical side of the SC equation so I'll try to help with any questions you may have.
In answer to the question on chamber sizes - the K100 8v twin cam head has circa 22cc in the chamber, the UK spec K1100 16v heads are approx 18.5cc. A 1275 5 port head is roughly 24cc so it doesn't take too much juggling with piston dish sizes to get a suitable cr for the engines use.
the engine bloc kbasically has to have the pushrod tubes holes blocked off and the rear row of cylinder head studs - cast iron plugs used. For the front row of studs - amazingly the front three mini heads stud positions can be retained the outer two require blocking and new ones drilled. The water ways require angling in the block to match the head. The chambers in the head do not sit exactly centrally in the bores but this is not a problem even on the 16v head.
The heads are really well built and they look and flow air like minature BMW "M" motors - the bog std 8v head produces over 130cfm through the inlet with zero work from a 34mm valve - bog std mini 5 port runs at about 90cfm. The 16v head in stock form turns over 150cfm and with a little tickling substanitially more - so you have the recipe for some hot motors.
my 16v 1380 produces 163bhp at 8200rpm - pulls 100+lb/ft torque from 3700-8500. the little 1293 8v we hope will produce a really torquey and fast road engine - we'll see soon.
cheers
John
I'm the technical side of the SC equation so I'll try to help with any questions you may have.
In answer to the question on chamber sizes - the K100 8v twin cam head has circa 22cc in the chamber, the UK spec K1100 16v heads are approx 18.5cc. A 1275 5 port head is roughly 24cc so it doesn't take too much juggling with piston dish sizes to get a suitable cr for the engines use.
the engine bloc kbasically has to have the pushrod tubes holes blocked off and the rear row of cylinder head studs - cast iron plugs used. For the front row of studs - amazingly the front three mini heads stud positions can be retained the outer two require blocking and new ones drilled. The water ways require angling in the block to match the head. The chambers in the head do not sit exactly centrally in the bores but this is not a problem even on the 16v head.
The heads are really well built and they look and flow air like minature BMW "M" motors - the bog std 8v head produces over 130cfm through the inlet with zero work from a 34mm valve - bog std mini 5 port runs at about 90cfm. The 16v head in stock form turns over 150cfm and with a little tickling substanitially more - so you have the recipe for some hot motors.
my 16v 1380 produces 163bhp at 8200rpm - pulls 100+lb/ft torque from 3700-8500. the little 1293 8v we hope will produce a really torquey and fast road engine - we'll see soon.
cheers
John
