Finally got the '67 to the dyno today. We dropped a Road Demon 625 on it and let it rip. Nothing to write home about but respectable.

Here are the numbers in 100* heat.

Max HP: 240
Max Toruque: 268

Graph can be found here.

http://www.funkconsulting.com/67camaro/misc_images/dyno_run.jpg

We did a we bit of tuning but ran out of time. We will finish tuning next weekend.

The trouble with dynos is they are good for tuning but often they have not been recalibrated for a long time, so actual 'real' reading canbe way off...usually low.
We dynoed mine the other week...check tuning...the dyno we know was reading low.
was hitting 205 hp @ 3800.
This is a stump puller, low rpm (1200 to 4500 rpm) economy engine for street/daily cruise.
202 fuelies skimed and deck skimed, performer manifold, cast rams horns, Modified stock hei, 450cmf carb, low duration high lift cam advanced 2 deg, 308 posi 235x60x14 tyres, turbo 350

It of cause leans out over 4000 rpm, but has incredable low end throttle response and sure sets one back in the seat upto about 110mph

Did a economy test run towing a Bradford van on car trailer on Sat...just over 22mpg (our gal is 4.54l/gal)

The trouble with dynos is they are good for tuning but often they have not been recalibrated for a long time, so actual 'real' reading canbe way off...usually low.

There's no calibrating a Dynojet. It consists of a large roller and a computer that measures how fast it accelerates. The actual 'real' reading is very consistent.

Chris,

I've often wondered what kind of power your 327 was making. Assuming a 25% loss in the drivetrain, it should put you right at 300HP at the flywheel. As you said, that's respectable for a daily driven 327.

-Mark

I looked at your site for the combo info, and it says camshaft "unknown". Is this still true? Just curious what parts made those numbers.

John, sad but true. I never got the cam card from the guy who built the motor.

I realize not knowing what the cam is takes away from the value of the pull but at least I have a baseline to work from when Tony empties his garage and helps me stick a new one in.

Steptoe: Those numbers are dead on for what it will do in the 1/4. 13.8/13.9 @ 101/102 my 60' is usually 2.2/2.3 on street tires.

There was a '99 Cobra there. 578hp @ 7000. That thing screamed on the dyno.

If the dyno is close to matching 1/4 mile it has to be close...my comment was not saying that the dyno used was ouit, but a general comment on dynos used for tuning, a most ppl are not awhere of calibration.
What carb cfm do u have?
Did u get the figures for mixture ratios/rpm?

To establish close cam config, a diall on the top of the lifters and a degree wheel will give u these.
I am reasonably pleased with my results this time round for a street stump puller, knowing a larger carb would give me a lot more top end to around 6000 rpm.
Your results that put u into high 13s for a street car, I would be pleased with that to. No doubt about it, the chevy sb is a great engine.

Road Demon 625.

I saw the A/F ratio, but @ 11:30 and being there for seven hours I just wanted to get home. :)

I will get the print out next weekend. It was right about 12.5 - 13 through the whole pull.

7 hrs !!! man thats a heap of time, and momey
I put mine up, get the readouts....about 20mins, then if anything is obviuos..mixtures etc go home make a few changes..power valve, jets whatever...then book it in and take it back to check.
The guys looking for the fine edge will say.."hey barometic pressures air temp etc changes" but for the normal street or street strip this fine edge does make a significant difference.

Once that is right I then start on timing...most of this can be done on a steep hill and stop watch....
I am fortunate enough to have a portable exaust anyliser that we put on the passengers lap, and again check on a long steep hill...so I can get these pretty right before the dyno.
So now dyno ing is more of a final check, after a week or so doing a economy checks over 100 miles ...always fill up at the same pump, and let it auto cut out...do the 100 miles and refill.
With My new diff custom billet cam the curve is very much unchanged but the vac advance canister needs significate change...vac range and total deg in it.
So I think I can get better highway economy than I have at the moment...but im not complaning about what it is currently running...So time is being spent on rebuilding engine/ gearboxes/front suspension, steering boxes etc for my Bradford..(cant buy parts so I have to rebuild myself)

We weren't on the dyno for 7 hours. :)

We hung out and he worked us in when he could.