mk1-forum.net

I'm looking at getting some high lift rockers for my Mini this Christmas - it currently has the sintered steel style fitted. I'm not really sure what to be looking for, as the engine has been modified.

Engine Spec:

Fuel:
Twin HS2 carburettors, standard air box with K&N elements.
3-into-1 exhaust manifold, single box RC40

Cylinder Head:
12G295, skimmed/ported/polished, double valve springs.

Cylinder Block:
Pre A-plus 998 block, bored +20 thou
Standard crankshaft and con rods
Kent Cams 266 camshaft
Lightened and balanced flywheel

Gearbox:
Gold Seal 3-synchro

I've had a look on various websites, most roller-tipped rockers seem only to be suitable for 1275 motors. Minispares do 1.5 forged rockers, these seem like a safe bet.

Any suggestions?

joss

you would struggle to find roller tips to suit a small bore in either 1.3 or 1.5 type now, i dont think they have been made for years. they differ from large bore as the rollers are central in the end of the rocker (rather than been offset, as per the large bore)

the 1.5 high lifts will fit with with a bit of shimming to ensure the tips are central on the valves

If you fit higher ratio rockers double check the clearance between the valves and the cylinder block before you turn the key, I assume as you're running a 940 head and 266 cam the block has been 'pocketed'.

The minispares ones are good, forged, non-roller rockers and a reasonable price. Just pay attention to the spacing.

TBH though, I wouldn't expect much gain on that spec engine. It has a fairly nice cam that will provide plenty of lift for the cooper 295 head and this will cope with the demands upon it. Your not really strangling that 1000cc.

I'd maybe spend my money on electronic ignition or a cooper dizzy.