12 Second N/A Slant 6?
It seem head flow is limiting factor here the bigger cams make less power across the board except between 6000-7000, Yellow line 256 cam, Maroon line 262 cam, Red line 270, 256 cam
289HP@6000 292ft-lb@4500, 262 cam
291HP@6000 287ft-lb@4500, 270 cam
287HP@6000 275ft-lb@4500-5000
273,
This is very interesting to me. Thanks for posting the graphs. I've never seen such an in-depth analysis before.
I was curious about our engine, whther your program's capabilities extended to boosted engines as well.
Our engine is a stock stroke 1964 225, slant-six with a .065" overbore. It has a true 9:1 compression ratio with a mildly-ported head that has 1.75"/1.5" valves installed with a 3-angle valve job. The cam has 210/210 degrees of duration @ .050"-lift and is ground with 115-degrees of lobe separation. Rockers are nominally 1.5:1. Gross lift at the valve is .484". Head is un-milled as is the block, using a .022" steel shim head gasket.
Induction is blow-thru Holley 650 double-pumper on an Aussie long-runner manifold, un-ported.
Turbocharger is a generic Turbonetics 67 mm unit with an individual-runner header with 1.625" runners of varying lengths. Waste gate will be set to deliver 20 pounds of boost eventually, though we are running 10 pounds at the present time. I'd appreciate knowing the output using both boost levels, if you can do that.
Ignition is locked in at 18 degrees with no curve of any kind, just 18 degrees, static. Maximum rpm is 5,500. Maximum boost is achieved by 3,000 rpm.
Connecting rods are K-1 (198 units, nominally, 7"-long.)
A Spearco 550 hp (limit) air-to-air intercooler is run, along with a Snowperformance Boost Cooler alcohol spray injector using 100% methanol, set to come on at 8 pounds of boost.
Mixture under boost is an A/F ratio of 11.5:1.
I hope this is enough information for your program to be able to generate some ballpark figures.
I would sure appreciate if you could run these numbers through your excellent program, as I have NO IDEA what this engine should make in terms of horsepower and torque.
If it can't be done, of if you don't have the time to do it, I understand.
Thanks for listening!
