[snowman]

I have a 66 912 race car. I built the engine using everything that is the best, eg Carillo rods, latest Scat crank, Shasta Pistons, all the tricks, and an Elgin M7805 Cam at 312 deg duration. Puts over 145hp ON THE GROUND in dyno testing. That means about 180 to 200 HP at the crank. Not bad for a 1720cc 50 year old engine.

I am not satisfied, so I personally bought and turned out a cam blank out of 8620 steel. I sent it to a well known cam grinder to make the ultimate race cam for a 912. Before this I had contacted most of the cam grinders for such a grind, but it turns out they do not have any suitable blanks in stock, consequently I had ot roll my own. I am still discussing the specs for this cam with the cam grinder.

So whats your dream cam grind?? Duration, lobe centers, lift and whatever. I hope to get the most ever achieved out of any 912, to race it a couple of times, and then sell it to someone who can win with it. I am hoping for over 160HP on the ground, ie a 912 engine that can beat any 911S engine of that period hands down.

I have run a computer sim of the stock 912 engine, the current race engine using dyno 2000 and actual measured air flows and parameters. The sim agrees with the stock engine hp and the race engine hp within 2% or so. I have not been able to out do the 7805 cam in any simulation. Is the sim not accurate or am I on a mission to nowhere? What I am looking for ammounts to 230hp at the crank at 8000rpm. Intake system flows 190cfm at 0.55" lift. compression is 12.5 to 1, headers are stepped, large tube, red line 30wt race oil, 90lbs min pressure, Datsun 42mm intakes. intake stacks 110 percent of displacement and length resonates at 7800rpm, record type grooves cut in entire intake system, coated everything.. Valves swirl polished, full 5 angle cuts on everything., necked down valve stems. Everything cc ed and matched, balanced to withing 1 gram, special honing of cylinders. All tolerances within 0.0005" of desired, cylinders honed with special torque plates attached.