BacaBill

I was hoping on having this for Christmas but,,, Oh Well. Gonna be worth the wait. After watching about 17-20 of their (SkipWhite Performance) 383 stroker builds on YouTube, mine came out with the best #'s. Should be getting shipped tomorrow to have on Friday.

http://www.youtube.com/watch?v=OmY-y...ature=youtu.be

malicatasr

Nice numbers

Avette4me

You oughta like that.

johnt365

That's awesome! I can't believe I just sat and watched 30 something dyno pull videos. What a cool job that is, "Final test run".

nice motor.

cv67

Any specs on the motor? tell us about it
Sounds like it had more in it rpm wise

gkull

I'm a dyno operator and when I see stuff like that I am very skeptical about the results.

Things I noticed to enhance power over the delivered motor. Electric water pump, no ACC's, dyno headers without mufflers, ridiculously low oil and water temps that don't jive in the movie. 147 and 161.

Then the screen graph indicating 492 corrected hp at @5000 rpm and then the power decreasing to shut off

REELAV8R

Looking at that run it appears that the peak was at 5600 rpm or so. Am I reading that right? If 5252 is crossing point and each dot represents another 1000 rpm.
I looked at a bunch of 383 dyno run results and it appears that most achieve 450 or more for HP.
What I did notice though was that it took more like 6000 plus rpm to get that HP.
Is it likely that a 383 motor/cam combo could achieve 492 HP at 5600 rpm and still idle at 1000 rpm?
Like I said I don't know. Just interested in what an experienced dyno tech has seen.

gkull

If you look at the HP graph the peak is 492 hp and then decreases to the stop test rpm. If you watch the meter in the run it swngs to 5600 - 5700 rpm just at shut down test. Look a the video and stop the frames.

The video link has another odd item. You have the dyno run of some motor with electric water pump and off to the right you have the poster name with a video showing a complete motor on an engine run stand with front belts and mufflers. WHY would you ever waste the time to mount a motor on a run stand and a dyno? It is alot of man hours to put a motor on a dyno. So we mount them, check everything, and break in the motors for 20-30 minutes with a 25 hp load at @ 2250 rpm. Then we do the vary the rpm up and down to about 3000 rpm for anothe 20 minutes. Then it gets an oil and filter change, check head bolt TQ, valves, plugs. Later you bring it all up to 180 degrees and figure out what RPM the motor can take full throttle for dyno runs with some short tests. Then it is the full dyno runs where you look at all the exhaust temp probes a BSFC readouts and you change jetting and timing to get the most linear graphs

Even starting at 180 temp for oil and water, you see oil temps flash to 220 -240 under repeated heavy loading by the dyno

bluedawg

Nice. Please do share the combo.

billla

This is typical of engine dynos even in your shop though - fair? Every time I've done this with my local shop it's been the same way. Performance crate engines are rated the same way.

I agree the number is drastically inflated from what it will make in the car, but the purpose is just to break it in and get it in the ballpark - the chassis dyno is where the real tuning gets done. It does look like an odd run, though...

Bragging right numbers are what they are, but they're still fun

Congrats to the OP on your new engine - have fun!

worship79

I love the sound of a 383 in the morning! Enjoy!

gkull

No........ We don't chase numbers. We even install the exhaust systems off the car if possible. So when it is installed it is ready to go.

You want to install the motor and transport the car to the track and have it ready to go after a pre-warm up. You don't go to a track and screw around with adjusting the motor. It just gets up to temp and the driver gets in and goes.

ajrothm

Nice numbers!

My buddy built a 383", home ported 215cc TFS heads, ported RPM air gap, 11.2 comp, Bret Bauer 224 HYD roller, 750 HP carb, Very mild street motor.. That engine dynoed 490hp with only the water pump on it, thru exhaust.... Ran 10.70s in a 1st gen camaro, later on it ended up in a 66 Chevy II that runs 10.90s.. Motor has atleast 30k miles and 100 passes on it now...still kickin..

gkull

I don't think that this and the dyno engine are the same.

billla

So when you dyno an engine you install the full accessory stack and exhaust? As you noted, that's a fair bit of effort and expense - I've just personally never worked with a shop that did that. Good on you

cv67

Would be interesting to see the difference between one "dressed" ie alt and ps with mufflers and the other with the bare essentials and open headers.

diehrd

Gkull is actually performing a dyno test the correct way.

In 1972, American manufacturers phased in SAE net horsepower. This is the standard on which current American ratings are based. This rating is measured at the flywheel, on an engine dyno, but the engine is tested with all accessories installed, including a full exhaust system, all pumps, the alternator, the starter, and emissions controls.

As far as the OP duno pull it was fun to watch and have some fun with her !

BacaBill

Thank you everyone for some things I didn't even notice in the video. They did 8 pulls (for a price) on the dyno to tune in the carb & timing settings. Not sure at what point this video was taken but I would ASSUME it was the last pull figuring they would want the best numbers to be advertised. Thanx again all,,, Bill A
ps: electric water pump is probably in my future too, just not yet. Electric fans & a new radiator are higher on the list.

BacaBill

http://www.skipwhiteperformance.com/...Item=383STG2TK

upgraded to forged pistons, went with the choice #2 cam, Scorpion roller rockers (Comp Cams the reason my Vette been in the garage for 8 years), QuikFuel 850CFM carb, StreetFire ignition, 8.8mm wires, over the headers wire looms, exhaust evac system, bought flywheel from Skips (used while dyno'ed). All told, $6549. to my door.

bluedawg

Thanks for sharing.