Right now I am building an A12 for a customer who is putting the engine in a 1200 coupe. The specifications are,"That the engine makes 120 hp (crankshaft) and is still streetable". Itried to talk him into an A15 as it would have been cheaper to get the grunt, but he loves his A12!!! A bit later he will take most of the A12 parts and put them on an A15 I thinK
I have used an A14 oval port head now fitted with 37 inlets and 31 exhausts and 24 cc chambers. This gives a comp of 10.2 approx. It has dual valve springs as well. New K lines inserts have fitted to the guides. The valves have been seated concentric to the seats. The head flows 132 hp (exhaust over inlet ratio 68%) at 480 thou lift.
I am fitting a special cam developed for the engine by clives cams. It is a modified 81A grind (231 degree @0.050" lift duration) with 106 degree lobe centreline. This will be street driveable, yet have lots of go. With the webers it probably go - "brump brump, brump brump, brump brump, brump brump" and perform excellently as well..
The engine has two 40DCOE webers with 32 chokes F16 emulsions 115 mains 160 airs 4.5 auxuiliary vents 45 F9 idles and 35 pumps.
The exhaust is Hi tech headers (HPC coated in and out) and a 580 cfm mufffle rsystem throuh 2.25" header pipes. An S2 bluebird dissy and coil complete the picture.
Performance at 5.8 kg/hp should make it able to produce enough to savage a stock WRX or S15 200SX.
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