*BILLET* aluminum rods

COMP461 said:
I don't believe a diesel will even make power at 1000 rpm's per second.
This is on an engine dyno. I would love to see that dyno sheet, that means a pull last 1.5 to 2 seconds
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850 rpm to 3850 rpm at 1000 rpm/sec would be 3 seconds, no?
 
Chassis dyno’s are almost a sport now. Its about to hitting the roller with a quick shock , and yes they have learned how to accelerate, and tune for dyno power that would melt if that same tune went down the track. I would not put any stock in the power numbers correlation to track results.

Now to engine dyno’s that produce results that are meaningful and controlled. On a Super Flow dyno you set the rate that the absorption brake allows the motor to accelerate. This means even acceleration rate over the entire pull. If you dyno in a stair step pull, meaning it steady steps the rpm as the motor levels out in each rpm, the power is dramatically more power than when you set the rate at something meaningful.

By meaningful I mean to match the rate to the gear you are tuning for. On comp and Pro stock engine programs we tune for each gear.

When a motor is ramping out you can lean on it harder with compression, timing and fuel, once you get in high gear you , where the rate is much less you will have to back down.

I have spent thousands of hours on engine dyno’s , and there is reward in what I am talking about.
 
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COMP461 said:
Chassis dyno’s are almost a sport now. Its about to hitting the roller with a quick shock , and yes they have learned how to accelerate, and tune for dyno power that would melt if that same tune went down the track. I would not put any stock in the power numbers correlation to track results.

Now to engine dyno’s that produce results that are meaningful and controlled. On a Super Flow dyno you set the rate that the absorption brake allows the motor to accelerate. This means even acceleration rate over the entire pull. If you dyno in a stair step pull, meaning it steady steps the rpm as the motor levels out in each rpm, the power is dramatically more power than when you set the rate at something meaningful.

By meaningful I mean to match the rate to the gear you are tuning for. On comp and Pro stock engine programs we tune for each gear.

When a motor is ramping out you can lean on it harder with compression, timing and fuel, once you get in high gear you , where the rate is much less you will have to back down.

I have spent thousands of hours on engine dyno’s , and there is reward in what I am talking about.
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The numbers I'm talking about was on a Superflow chasis dyno, with the very same software a superflow engine dyno uses.

My acceleration numbers would be even better on a engine dyno as on my chasis dyno I do not account for drive train inertia.

I can pull 1000hp at 600rpm/sec sweeps and there's lots that do much more than I am.
 
I think that Chassis dyno are useful tools to tune, but the power levels that they make are sometime unrealistic. Here is the second motor program on the dyno years ago with the Dr Performance truck.
Steady stated dynoed, it lost around 140 hp at 300 rpm’s per second. At 600 rpm’s per second it lost close to 300 hp. it was fairly good on acceleration in that it had over 18 to 1 compression and good cylinder heads



000_0015-1.jpg
 
well chit guys, we are doing it all wrong, in order to make more power and run a faster 1/4 mile time, we actually need to slow our motors down. who woulda thunk it.
 
COMP461 said:
I think that Chassis dyno are useful tools to tune, but the power levels that they make are sometime unrealistic. Here is the second motor program on the dyno years ago with the Dr Performance truck.
Steady stated dynoed, it lost around 140 hp at 300 rpm’s per second. At 600 rpm’s per second it lost close to 300 hp. it was fairly good on acceleration in that it had over 18 to 1 compression and good cylinder heads
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So these were up-sweeps or down-sweeps? What power level? I'm looking at dynosheets from earlier this year and I see 166 rpm/sec up-sweeps. Were these done for setting the max fuel curve or was this to see the hp/sec?

Edit: I fully agree that chassis dynos are useful, but you can't drag race a dyno.
 
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Positive, or up swept. You can get fuel curves in the ball park with steady state, but you have to accelerate at the rpm's you going to see at the track. HP at the crank is real, it’s not if you got the hit right, or were in the right gear. Drive train calculations are just that best guesses. A engine dyno is the only true way to see what is really happing in the motor, you can look at BSFC, (Brake Specific Fuel Consumption) and VE volumetric efficiency.
 
send me a set of AL rods and i will put your theory to the test :hehe: i know what my old set up did and all i need is another set of pistons (on order) for the engine
 
REV GAIN YO!!!!!!

Revgainyo.jpg



Greg take note, the 1000rpm sweep in less than a second.

40% loss at 600rpm/second .....:hehe:......:kick: Now baffle us with some more of your photo's and other bullchit.

Not going to say who's data but I'd think anyone that watches this stuff would have a good idea.

Engine dyno's are awesome, last time I checked though it takes a hell of a lot more than a engine to go down the track.
 
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Your fairly far off of understanding the concept, the time it takes to turn a roller and the corresponding hp is not anywhere close to reality of an engine dyno. I know that 1000 rpm’s per second is close to unachievable in a diesel with any kind of appreciable power.

There is a lot of manipulation of the way chassis dyno’s put out data, on paper. A spike be made to look like a big curve if you put hp on the side and rpms on the bottom, put time on the bottom and mph on the side and you will see most are extreme spikes. The dyno will read the spike up and down and average making it look like your sheet.

Anyone one that had spent any time on engine dyno, will understand reality.
 
Lance@Alligator said:
send me a set of AL rods and i will put your theory to the test :hehe: i know what my old set up did and all i need is another set of pistons (on order) for the engine
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funny , anything else? we did order a second block today for another Pro Stock Truck.
 
We have a stuska water break engine dyno for the stuff in my Sig. You are saying at 3k to 7k at 500rpm per second would take a dyno session 8 seconds to ramp up from 3k to 7k and you would not make power at 1000 rpm per second?

sent from my galaxy s3
 
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