I'm building a 557 as well, hoping to have it complete next month. What are you putting it into?
557 finally finished!!
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Junior User
Joined: Sep 2004
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557 finally finished!!
g'day all,
over the past year as some of you will know i have been building my first bigblock 460, stroked to 557. and i can now say IT WAS WORTH THE WAIT!! on the engine dyno it made 684 hp at 6300rpm with 677 lb/ft at 4300rpm.... those numbers make me a very happy man!!!!!!!!!! thanks to all those who helped out on this site.............now time for another look at the engine.............mmmm engine...ahhhhhhh
over the past year as some of you will know i have been building my first bigblock 460, stroked to 557. and i can now say IT WAS WORTH THE WAIT!! on the engine dyno it made 684 hp at 6300rpm with 677 lb/ft at 4300rpm.... those numbers make me a very happy man!!!!!!!!!! thanks to all those who helped out on this site.............now time for another look at the engine.............mmmm engine...ahhhhhhh
Elder User
Joined: Jan 2004
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Hey get,
If memory serves I did a DD run for you on a couple of configs. How did the estimates compare to the actual dyno runs. I'd like to know so I can keep refining my DD scenarios based on real-world numbers.
Thanks!
Brad
If memory serves I did a DD run for you on a couple of configs. How did the estimates compare to the actual dyno runs. I'd like to know so I can keep refining my DD scenarios based on real-world numbers.
Thanks!
Brad
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Junior User
Joined: Sep 2004
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g'day all,
the motor will be going into a 71 model f100, lowered 4inches with a 4 1/2 inch roof chop, (again another idea from this site!!) and once i can figure out how to post pics on here i will, it'll also made the numbers with the air cleaner on and on PUMP FUEL!! brad, your figures were sorta on the money and im sure if you had all the specs it woulda been spot on!! they were,,
Your stroker absolutely BEGS for a good roller cam setup!
Using the Crane 325-2S-12 hydraulic roller grind, an 1100 CFM carb , and headers with 2.25" primaries, DD predicts 676 HP @6000 and 697 lb-ft @4500. On pump gas. Yikes.
i used edelbrock rpm heads, PORTED like you wouldn't believe,and a 1050 dominator, also a victor 460 manifold which also was flowed and ported..
alot of dollars went into this thing but thats why you do things proply the FIRST time... it'll run at 6300rpm all day long and the curve doesnt drop..... YEAH BABY!!!
the motor will be going into a 71 model f100, lowered 4inches with a 4 1/2 inch roof chop, (again another idea from this site!!) and once i can figure out how to post pics on here i will, it'll also made the numbers with the air cleaner on and on PUMP FUEL!! brad, your figures were sorta on the money and im sure if you had all the specs it woulda been spot on!! they were,,
Your stroker absolutely BEGS for a good roller cam setup!
Using the Crane 325-2S-12 hydraulic roller grind, an 1100 CFM carb , and headers with 2.25" primaries, DD predicts 676 HP @6000 and 697 lb-ft @4500. On pump gas. Yikes.
i used edelbrock rpm heads, PORTED like you wouldn't believe,and a 1050 dominator, also a victor 460 manifold which also was flowed and ported..
alot of dollars went into this thing but thats why you do things proply the FIRST time... it'll run at 6300rpm all day long and the curve doesnt drop..... YEAH BABY!!!
FTE *******
Joined: Jan 2004
Posts: 791
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From: Pittsburgh, PA
Thats a sweet engine you have put together. Who did the head and intake porting....was it home brewed or farmed out to a pro? Did you port using Scott J's site as a guide?
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Elder User
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The diff in predicted vs actually comes out to...
8 hp - a positive variance of 1.18% from the predicted 676 hp
20 lb-ft torque - a negative variance of 2.95% from the predicted 677 lb-ft
If I can stay within three percent on everything, I'll be thrilled! Being able to get that close without actually buying a single part is tremendous. It establishes reasonable expectations along with allowing more time for build refinement rather than initial development.
Brad
8 hp - a positive variance of 1.18% from the predicted 676 hp
20 lb-ft torque - a negative variance of 2.95% from the predicted 677 lb-ft
If I can stay within three percent on everything, I'll be thrilled! Being able to get that close without actually buying a single part is tremendous. It establishes reasonable expectations along with allowing more time for build refinement rather than initial development.
Brad
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FTE *******
Joined: Jan 2004
Posts: 791
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From: Pittsburgh, PA
The one wierd thing I have noticed (After Being show by a friend) from DD is that if you take whatever build you have, and you keep your flow numbers from your flow bench and just add or take away from valve size...the numbers change drasticly. But in reality if you worked a head with a small valve that had the same flow values as a head not so well worked but with a larger valve...the one with a larger valve will show more power. Almost like they dont really use the input of flow numbers, like they use a valve size to base power on rather than true flow. If I take my engine and put a huge valve in with the same flow numbers...I make more power. If I go to a .25" smaller valve size I drop a ton of power even though the flow I have fed in stays the same. Odd.
Elder User
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I saw that too. It changed after I unchecked the "auto calculate valve size" option and began feeding in flow numbers manually. Now it's a lot less sensitive to valve size, but critically sensitive to the flow numbers in the first few hundreths of valve lift. It gets worse as the displacement goes up.
I'm just happy that a little diligence and some good starting info keeps getting me this close. All I ever wanted was a "get me close" tool that I could use to examine combos before spending a ton of money on parts.
Brad
I'm just happy that a little diligence and some good starting info keeps getting me this close. All I ever wanted was a "get me close" tool that I could use to examine combos before spending a ton of money on parts.
Brad
Hotshot
Joined: Dec 2003
Posts: 18,423
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From: iowa
Brad if I get mine onto a dyno this year I will have you run it, and see how it compares, I have had problems with DD not liking bigger cid engines but yours might be setup a little differently (basically I got really stupid with cams just to see if it would change and going from 278 .050 duration to 304 at .050 and increasing lift from .800 to .940 and the total increase in HP according to DD2K was 12hp) I will let you know if I am gonna make it to a dyno or not.
Elder User
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It keys airflow calculations directly from displacment and RPM, adjusting dynamics for things like carb size, headers, and intakes. It looks like it's geared toward the casual rodder, meaning that seems to work best with combos more typical of hot street or street/strip. It really has a snit if you get too far outside the box.
That being said, my gut reaction to your proposed cam change is that it may be too much. I can't remember exactly what your combo is, but that's a major honkin' chunk of cam you're talking about. Will your heads flow enough to support it? And is your valvtrain up to something with almost an inch of lift at the valve? (
)
Brad
That being said, my gut reaction to your proposed cam change is that it may be too much. I can't remember exactly what your combo is, but that's a major honkin' chunk of cam you're talking about. Will your heads flow enough to support it? And is your valvtrain up to something with almost an inch of lift at the valve? (
)Brad
Last edited by Brad Johnson; Feb 22, 2006 at 01:44 PM.
FTE *******
Joined: Jan 2004
Posts: 791
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From: Pittsburgh, PA
Monsterbaby, I have my engine that is being finished next month done on DD2K. I did input actual flow numbers and all. Its a fairly hot cam/head combo that I think DD2K is under-predicting. Email me if you want a copy of the file. DD2K is showing it way weak, not even 900. My last engine was showing about 850 and did 932 on the real dyno.
Maybe it cant understand my cam...
324/334 advertised .866/.864 lift on a 112 lobe seperation angle. This is on a Ex-514 headed 521.
Maybe it cant understand my cam...
324/334 advertised .866/.864 lift on a 112 lobe seperation angle. This is on a Ex-514 headed 521.
Last edited by fordtrkpuller; Feb 22, 2006 at 01:57 PM.
Hotshot
Joined: Dec 2003
Posts: 18,423
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From: iowa
Brad I think your right, I see the pattern of over estimating mild builds and seriously underestimating high hp stuff.
Truck puller thats about what I figure it's under estimating mine by to, I am pretty sure I have been pushing around 850 and it says around 790, and with the new cam myself and several other people I have spoken with that are very knowledgable will be very suprised if this thing doesn't break 900 yet I can't get DD2K to estimate it much over 800hp. but hopefully I will get a chance to find out.
BTW my 850 estimate is based on several factors including similar builds, and the fact that I can beat fairly consistantly another truck that is lighter then mine with better tires, better suspension putting out pretty close to 600hp with a 300hp nitrous kit on it.
Truck puller thats about what I figure it's under estimating mine by to, I am pretty sure I have been pushing around 850 and it says around 790, and with the new cam myself and several other people I have spoken with that are very knowledgable will be very suprised if this thing doesn't break 900 yet I can't get DD2K to estimate it much over 800hp. but hopefully I will get a chance to find out.
BTW my 850 estimate is based on several factors including similar builds, and the fact that I can beat fairly consistantly another truck that is lighter then mine with better tires, better suspension putting out pretty close to 600hp with a 300hp nitrous kit on it.
Post Fiend
Joined: Jul 2003
Posts: 11,945
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From: Spokane, WA
Hey getuted, what compression is your new engine? I haven't been to Aussie for a few years but if I remember right your premium is 97 octane. Is this correct? Premium here is 92-93 depending in the state. I'm hoping to run on 10.8:1 . . . just curious what you're running.