I just want to share some hp and torque numbers on a 12A standard bridge motor i built for a Swedish racing class up to 2 litres. Some short info:

Street and bridgeported with exhaust sleeve removed.
Coated 4.65 kg 9:4 cr rotors balanced
Weber 51 IDA with 48 mm chokes 250 main and 120 air jets F7 tube.
ProSpark digital ignition set at L 21deg T 16 deg.
EWP Electric waterpump NGK BUR 9 EQ for L and SD 10A for T
600 mm primaries with inner dia 47 mm to a merge and then a cone to
3" 100 mm exhaust then a 3" HJS 100 cel race cat and 1 straight thru 3" silencer.

Power max 253 hp@8500 rpm maximum tested rpm 9100.
Torque max 225Nm or 162 ft/lb@7500 rpm.

Engine had over 240 hp from 8000 rpm to 9100 rpm, a really broad power band.
I hope to build a new 12A engine this summer, a monster bridge that hopefully
will make some serious hp

/Lasse

 

sounds good. as far as the powerband is concerned, what range of RPM are we talking about for the torque curve? also, just curious, why run without the exhaust sleeves?