My 383 Stroker hit the dyno today
#1
Racer
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My 383 Stroker hit the dyno today
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
http://www.youtube.com/watch?v=OmY-y...ature=youtu.be
#5
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St. Jude Donor '05
Any specs on the motor? tell us about it
Sounds like it had more in it rpm wise
Sounds like it had more in it rpm wise
#6
Team Owner
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
#7
Le Mans Master
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
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
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.
#8
Team Owner
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.
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.
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
#10
Le Mans Master
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!
Last edited by billla; 01-09-2014 at 01:54 PM.
#11
I love the sound of a 383 in the morning! Enjoy!
#12
Team Owner
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.
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.
#13
Le Mans Master
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..
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..
#14
Team Owner
I don't think that this and the dyno engine are the same.
#15
Le Mans Master
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
#16
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St. Jude Donor '05
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.
#17
Safety Car
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 !
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 !
#18
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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
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
ps: electric water pump is probably in my future too, just not yet. Electric fans & a new radiator are higher on the list.
Last edited by BacaBill; 01-09-2014 at 07:57 PM.
#19
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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.
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.
#20
Safety Car
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.