Desktop Dyno..any volunteers? Would any of you with dyno programs care to see what my engine specs compute to as far as horsepower and torque output and rpms? If not, no hard feelings lol. 306 cubic inches. Stock '68 heads, skimmed to true them. Stock Valve springs shimmed. Flat top Cast pistons. Approx.: 9 to 9.5 :1 C.R. CC 268H hydraulic cam 218/218 @ .050" lift 110 L/S angle, .456"/.456" lift 1-5/8 primary x 3-1/2" collector long tube headers 2-1/2 inch duals with FM 40s no H or X pipe. World Products Crosswind Dual Plane "Air Gap" style intake. 600cfm V.S, Holley DSII ignition, Accell wires I might want to get on on this simon Vs Scooper thing. The rest of my combination. Don't know the weight, 73 LSO car. 17" bullit wheels. No A/C Has power steering. 8" 2.79:1 for now. 9" with 3.70 coming. 235/45r17 rear, 215/45r17 front rebuilt C4 with TransGo Shift Kit and "street stall" converter supposed to be about +500 rpm over stock. brad
scott knows the program pretty good.. he would do it.. and as far as that cam goes.. the xe268h has an intake lift .509 and exhaustt .512./. you might want to double check those lifts you put there.. and you can run your car at the track and pot your numbers to compete with me and scott if ya like.. i know my numbrs are gonna change big time this weekend.. since i just got my 4.11 gears and mini spool installed
I am not "pretty good". I just borrow from an existing profile, change the head flow and cam, and whatever else you have, and it spits out a decent estimate. I will try to put it in maybe tomorrow, if I have some free time during the day.
i agree with that.. you can test all day on the desktop dyno, but the track is where you will know for sure
Well, now that simon has a spool and 4.11 gears, I am pretty sure there is no more stmanser vs. scooper thing... 8" rear comes in 3.80, not 3.70. 3.80 will keep you streetable, 4.11 is mostly track. We will let simon decide that for us.
Without spending a crap load of time on it, here is what I got. I used 9.25:1 compression ratio. Don't make any bets based on these numbers, I will not be held responsible for any losses. 317 HP @ 3500rpm 249 ft/lbs @ 4500 These are flywheel numbers, not at the ground...
I already had a similar setup in my Desktop Dyno Basic. I bought an engine from Dan Hines with that same setup except it came with E-5 heads, larger valves, and some porting. Using your setup and a 9.5 ratio, I got 311 HP at 5,000 RPM and 371 TQ at 3,500 RPM. With stock heads and 1 5/8" headers, it'll be a torque monster.
OK first off thanks guys!!! I appreciate it! I just wanted this info for the fun of it. I don't intend to tune by it. Going to the strip this coming Sunday for MORE fun. Simon, I don't have the XE268, I have the HE268H and those are the correct specs with 1.6 rockers. So I don't think that I really have any more cam than you do, maybe less. Thanks again. The numbers make for good conversation, sometimes known as brad
My bad. I used the XE268H specs instead of the 268H specs. Revised numbers are" 300 HP @ 4500 RPM 379 TQ @ 3500 RPM What a torque monster for a street 306!
Our HP numbers look similar, but the Torque on mine looks a bit low. I would go with his numbers over mine...
oh.. i missed that part.. and if those numbers are correct.. then the dyno numbers should be less than that..your cam has a lot smaller lift than mine..but yeah.. like scott said.. go to the track and post a time slip
