572 Hemi....take a stab at the numbers....

Posted By: LAD 524

572 Hemi....take a stab at the numbers.... - 05/19/12 05:18 PM

Fresh 572" Combo in a street/strip appn is as follows:

Hemi mega block 4.5" bore - o-ringed
4.5" Bryant crank
Saenz rods
11:1 Diamond pistons - coated tops/skirts
Sealed Power rings
ARP rod, crank, head studs, oil pan studs, flywheel bolts
Bullet roller 752/684" lift 270/280 @ .050" 112 & Isky EZ roller lifters
Legend heads ported 420 cfm
Stage V rollers
MSD dist/box/crank trigger
Indy raised port SP intake
Pro systems1150
Billet electric water pump
Milodon ext dual line swinging pickup and pump

Any thoughts on HP/TQ estimates ? Dyno figs coming...

Hemi guys fire away....

Posted By: HEMIFRED

Re: 572 Hemi....take a stab at the numbers.... - 05/19/12 05:23 PM

750-800

I think too much duyration for a street care and no need for O rings at all. I run 15-1 without them

Posted By: LAD 524

Re: 572 Hemi....take a stab at the numbers.... - 05/19/12 05:28 PM

I agree Fred but the heads came with them..they came off a diff engine with a stiffer CR than this one.

Bullet specced out the cam so I went with their recommendation on this one....

Rat

Posted By: RemCharger

Re: 572 Hemi....take a stab at the numbers.... - 05/19/12 06:34 PM

I would think more north like 850-875..
My 383 cam has more intake duration than that, but I don't know hemi cam specking,,

Posted By: LAD 524

Re: 572 Hemi....take a stab at the numbers.... - 05/20/12 03:58 AM

Came in last nite at 850 @ 6500 and 770 TQ @ 5300.

Varying timing from 30-34 didnt make much difference in the fugures.

TQ curve is nice with over 600 ft/lbs from 3K.

Pleased with the outcome to say the least !!

Posted By: Hemi Allstate

Re: 572 Hemi....take a stab at the numbers.... - 05/20/12 05:12 AM

Quote:

Came in last nite at 850 @ 6500 and 770 TQ @ 5300.

Varying timing from 30-34 didnt make much difference in the fugures.

TQ curve is nice with over 600 ft/lbs from 3K.

Pleased with the outcome to say the least !!

Interesting!! Thanks for posting the results.
Congrats!

Posted By: Dragula

Re: 572 Hemi....take a stab at the numbers.... - 05/20/12 10:59 AM

That's similar to my combo...My guess 785hp

Posted By: smokinwoody

Re: 572 Hemi....take a stab at the numbers.... - 05/20/12 01:09 PM

nice stout street engine....

Posted By: tubtar

Re: 572 Hemi....take a stab at the numbers.... - 05/20/12 05:36 PM

Quote:

Came in last nite at 850 @ 6500 and 770 TQ @ 5300.

Varying timing from 30-34 didnt make much difference in the fugures.

TQ curve is nice with over 600 ft/lbs from 3K.

Pleased with the outcome to say the least !!

Very stout street / strip motor.

And at a very friendly r.p.m. too.
NICE !!

Posted By: Evil Spirit

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 09:07 AM

Quote:

750-800

I think too much duyration for a street care and no need for O rings at all. I run 15-1 without them

I was thinking the same thing - too much cam for an 11.0-1 engine. I wonder what the cranking pressure is - 140ish?

Posted By: LAD 524

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 09:12 AM

Quote:

Quote:

750-800

I think too much duyration for a street care and no need for O rings at all. I run 15-1 without them

I was thinking the same thing - too much cam for an 11.0-1 engine. I wonder what the cranking pressure is - 140ish?

Iwas thinking the same thing fellas but thats what Bullet specced given the combo/application so thats what I went with.

Guess they know more about it than I do

Posted By: Dragula

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 01:05 PM

Quote:

Quote:

Quote:

750-800

I think too much duyration for a street care and no need for O rings at all. I run 15-1 without them

I was thinking the same thing - too much cam for an 11.0-1 engine. I wonder what the cranking pressure is - 140ish?

Iwas thinking the same thing fellas but thats what Bullet specced given the combo/application so thats what I went with.

Guess they know more about it than I do

I am running 284 duration in my 484 hemi and its a street car....drivability is awesome, but I run EFI. Depends on what you can live with and the rest of the combination. Mine was fairly radical for a street car when I built it back in '98. I am in the process of rebuilding it, and the efi is not legal for nostalgia racing, so we are looking at the cam and what to run if we go carburated. Would rather keep my cam and efi, but time will tell.

Posted By: Evil Spirit

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 02:09 PM

Quote:

Quote:

Quote:

750-800

I think too much duyration for a street care and no need for O rings at all. I run 15-1 without them

I was thinking the same thing - too much cam for an 11.0-1 engine. I wonder what the cranking pressure is - 140ish?

Iwas thinking the same thing fellas but thats what Bullet specced given the combo/application so thats what I went with.

Guess they know more about it than I do

I know what you are saying- Bullit specing the cam - but whenever someone does something differently than I do, I wonder why. I try to learn why they do it differently, instead of what is seems to be coming common practice here and just calling them stupid for thinking different.

At 11.0 compression we are still running .500 lift cams at 250* at .050 lift, with a cranking pressure of about 180PSI and pump premium with aluminum heads. As I said, I'm curious why they spec such a large cam for 11.0, and what the cranking pressure is. I would just think they are leaving a lot on the table with the low compression (if they are trying to make big power) or using a cam that is harder on valve springs if the motor is more street/strip orientated.

Not flaming - just curious.

Posted By: LA360

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 02:15 PM

Is this engine going into your Charger Frank?

Posted By: LAD 524

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 02:21 PM

Mi Al...

Not sure yet but likely not

Posted By: LA360

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 02:22 PM

I am sure you will have fun with it regardless of what you put it into!

Posted By: LAD 524

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 02:36 PM

Posted By: LAD 524

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 02:49 PM

No probs fair qun...

Keeping in mind the application, the cam has been ground with the appropriate ramps tso as not to require mondo roller spring psi on the seat/nose or pound out the lifters on the street. that includes the type of roller lifter and springs chosen.

Re the duration @ .050", initally I thouhg that it was a ot of duration but in retrospect I guess it ain't so big in a big cube engine. As mentioned Bullet/the machinist has a lot more Hemi experience grinding the appropriate cams and putting the right combo of parts together for the supplied data/application and to achieve the desired goal.

Can I ask in which engines/what cubic inches are you running .500" lift with 250@ .050 with 11:1 - SB, BB, Hemi ?

In the end there are times when you have to be guided by those who have the necessary/reqd experience to build what you need and you have to go down that path...esp when you live on the other side of the pond.

Besides, cams/springs are THAT difficult to change if reqd

Posted By: Evil Spirit

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 03:18 PM

Only done a few Hemi's - don't claim to be an expert on them by any means - kinda why the post; as I've said I'm CURIOUS why the cam spec'ed at that comp. I've done a lot of SB and BB engines, and I try to pay attention to what others do - I'm never too proud to learn something. Usually, when a cam seems too big for a given combo, it's because the heads won't support the cubic inches and more cam is needed to fill the cyls, but that doesn't look the case in your package. So, if Bullet is grinding the cam a little "lazy" with soft ramps and slower rates - OK - I see what they are doing, and that will help with low end cylinder pressures, but "conventional" thinking would be to just use a normal .650 roller that would naturally have the cranking pressure and be easier on valve train.
Like I said - I'm not bashing your combo or anything - just thinking out loud and trying to see if there's something to learn here.

Posted By: LAD 524

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 03:36 PM

Not at all Evil...no offence taken.

Played with SBMs but this is the first foray into the land of BIG

So I was happy to be very specific about the parameters within which the engine had to operate and let the experienced "minds" recommend the appropriate can spex to suit with me asking plenty of quns along the way.

Im pretty happy with the outcome - only time will tell once its in the right car/package.

Cheers !!

Posted By: Dodgem

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 04:36 PM

a 270 duration cam on a 572 is a mild street cam in my opinion Kinda like a 240 on a stock 440

great numbers congats!

Posted By: Noodle

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 05:55 PM

http://www.buyracingparts.com/blog/2009/05/05/dyno-test-mikes-pump-gas-496-hemi/

Posted By: CompWedgeEngines

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 09:41 PM

Thats because you are not taking into consideration the displacement of the OPs engine.

What cubic inch were the Hemis you built, and what cams did you put in them? How do they run, or how well did they dyno?

As someone else posted, I wouldnt consider a 270 cam in a 572 a "big" cam.Your conventional thinking of a .650 is simply too small for this application. I'd say Bullet hit it pretty well. Also notice the 112 LSA.

Posted By: an8sec70cuda

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 10:45 PM

Cam is definitely not too big. Mine is 276/284 at fifty, 112 LSA, 11:1 compression, and the same cubes. 185 psi cranking and on 93 octane pump gas. Mine does have less lift though.

Posted By: Old School

Re: 572 Hemi....take a stab at the numbers.... - 05/22/12 11:07 PM

Quote:

Cam is definitely not too big. Mine is 276/284 at fifty, 112 LSA, 11:1 compression, and the same cubes. 185 psi cranking and on 93 octane pump gas. Mine does have less lift though.

my 580" motor with 13.1 has a 282/290 @.050. it does awesome on the street.....

Posted By: LAD 524

Re: 572 Hemi....take a stab at the numbers.... - 05/23/12 02:29 AM

Pretty much how I saw it fellas.... 572" of Hemi IS a big engine and big engines swallow up duration and you can add 8-10 deg of duration @ .050" with a roller compared to a comparable solid.

Regardless of the theory I feel the engine made very good HP/TQ at livable/non parts hurting rpm, which was the whole plan from the outset so id say we'd achieved what we set out to achieve.

Quote:

Thats because you are not taking into consideration the displacement of the OPs engine.

What cubic inch were the Hemis you built, and what cams did you put in them? How do they run, or how well did they dyno?

As someone else posted, I wouldnt consider a 270 cam in a 572 a "big" cam.Your conventional thinking of a .650 is simply too small for this application. I'd say Bullet hit it pretty well. Also notice the 112 LSA.

Posted By: quickd100

Re: 572 Hemi....take a stab at the numbers.... - 05/23/12 04:06 AM

I had Bullet spec my cam out also. I told them that the best commonly available fuel here is 89.5 octane. I also wanted something that was easy on the valve train. My compression works out to 10.5-1, my dynamic compression is 7.57-1 with 148psi cranking.
605 ci the cam specs out at 757/676 288/292@.050 on a 113 center.
I have never talked to anyone that didn't like the cam they got from Bullet. In almost all cases people said their new Bullet ran better and quicker than with their old cam. I have no doubt I'll like their cam. Dave