Being that I normally build and race pump gas street and strip motors I have my oil temps between 160 and 200 F and the water temps between 160 and 180 F on all my dyno testing. I've been told by more than one dyno operator, including Jason Pettis, that most motors they test will make more power with colder water temps than what I test with Mine normally don't
As already pointed out more than once, the engine dyno is a tool to measure changes, nothing else
We don't race dynos yet, do we

I can't get my head round this, i was told a .625/.625 275/283 on a 107 was too big for my 470 with 440-1 heads with bowl and guide work, same comp, and yet here's a motor with a .776/764 279/289 at 0.50 and it make all this power, surely it should be a mutt down low but it makes over 700 hp at 6000 ?
Mick

Once above the torque peak the penalties for low compression diminish a bunch I am sure. At peak torque reversion should be gone, so the power loss could be figured from a "compression change only" stand point, I would think. A 279/289 cam may be shorter on working duration than it first appears, if it is an older lobe type with big lash.

Have you run this pan at the track? I couldn't keep it from losing oil pressure when hard on the brakes, running ten quarts.

Unfortunately the torque figures under the curve aren't on the pics so we can't say for sure, also with max torque at 5600, i'd assume that the converter needs to stall at least that. So what are your opinions on the cam i thought of using in my 470 ?
Mick

We ran the Hughes HTL7276 ... maybe it was the 6872 ?? ... in the enginemaster entry, if I remember right the torque peak was at 5000 rpm ... over 600lb/ft and HP was still going up when we stopped the pull at 6700 rpm, contest only pulled to 6500 rpm and it was making over 700hp. I think the heads flowed 330cfm, static compression was 12.2.

Told by who? I run a .680-.660 Isky solid roller w/276-281 @ .050 w/lowly home ported RPM`s and 12.1.1 compression and it runs/drives just fine on the street..............

Greg, Jason only uses CompCams and they grind what HE wants em to............

Here is the cam spec sheet

Mike glad to see you have a happy motor, and that things worked out with Pettis.

Just updating this thread, wondered when the car is back at the track.
Mick

Will be running it in two weeks at Famoso in Bakersfield. It will be hot but I'm hoping for a decent gain, I'll update right afterwards.

That was the same thought I had( especially with the "low" compression.

At 770 horse and 3150, car should definitely threaten the 8's.

My prediction is 9.40's-.50's @ 140-142.

The guy who bought my old car upgraded the motor and had it dyno'ed by Best Machine.
It made just a tick over 700 horse.
It went 140 on S/S springs at 3220 pounds. 9.62 et.
Another 70 horse and 70 pounds less weight should run a whole bunch better than that, hence my comment it should threaten the 8's.

Back in the day, the overhead cam guys used to brag about 100hp per liter. Never get there with pushrods, they'd say.

This engine is almost exactly 100hp per liter. That's what 40 years of rubbing will do!

R.

At that weight and power if EVRYTHING is perfect it might dip into the .30's in really good air. He wont have really good air at Bako in two weeks. I would guess it will run well and make use of that cage and wondow net. And don't think Dwayne is to far off...

Those cam numbers are virtually spot on (1 degree) to an Isky RR735 I started out with in my motor, including the .200 duration numbers. The only difference is the lash spec, .026/.028 If I recall correctly.

I'm with you two.

One thing I forgot to mention is the car is certified,im not. I'm using this event to get my license so I hope I can complete it as well as get a decent run. If I can't get it done the end of this month I will be back in mid September do Mega Mopar.