tell me a bit about your engine and set up mate?
Thanks for the detailed answer on this Shrew,
You do make a very strong point regarding the loss of power on the cat models and the lack of choice for manifolds.
To be honest, the catalytic 33's I've driven feel so cut off on power even with the crossover manifold type, that if thats compensation for power loss, I'd hate to see how they were before that
89mm forged JE pistons - 11.5:1 cr taking the engine capacity to 1800cc
skimmed heads to 29 cc per cylinder "cup", polished and slightly ported intakes and outakes, stock valves and retainers - hydraulic tappets.
NON catalytic engine version.
Colombo & Barriani Fast road Medium cams - to work with hydraulic tappets.
Gozzoli vernier cam pulleys - yet to be installed
Lightened flywheel - which will be replaced to a stock one out of a 146 as I feel like I lost some torque but I'm very sure that I've also lost clutch biting point. Racing 4 ply custom made clutch and plate will be fitted when I drop the engine for the installation of the cam pulleys.
OMEX ECU and peripherals - Dizzy removed and replaced by OMEX coil pack, magnecor KV85 spark cables, NGK platinum spark plugs.
BMC cold air intake - the classic carbon cylindrical air box.
BOSCH Competition fuel pump
57mm diameter exhaust pipes follow a very thin straight through mid box, ending on a straight through back box.
Engine revs to 7500rpm
Rolling road tested with wrong valve timing gave 160bhp with 18Kg torques.
After the installation of the vernier cam pulleys and with the valve timing fine tuned and OMEX ignition timing corrected, will be looking at approximately 190bhp.
Mapping "guru" Frazer who mapped my car the second time and messed it up, said that my exhaust manifolds got so hot, they reached temperatures of turbo charged cars.
Mind you, my mixture was very rich at the time so that might have something to do with it as well.