Re: Street 572 wedge build
[Re: Lancer273cid]
#3051550
06/18/22 05:14 PM
06/18/22 05:14 PM
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Joined: Feb 2013
Posts: 154
Canada
cuda499
member
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member
Joined: Feb 2013
Posts: 154
Canada
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I'm gathering parts for my next engine build. It's gonna go to my 66 Dart street car, t56 magnum and S60 with 3.73 gears. 99% street driven.
I already have BMP aluminum block and Molnar 4.500 crank + 7.100 on the way to Finland and now I would like to get some opinions about what compression and cam I should go.
I will get my pistons from Diamond and compression options would be: 10.0 / 10.2 / 10.6 / 10.95 or 11.35
Fuel is going to be European 98 octane which is 93 octane in the US I think?
I want to use mechanical flat tappet cam because lower valve spring pressure thus easier for valvetrain on street use. I know big mechanical roller would make the most HP but this build is more of durability than maximum horsepower.
I already have heads and intake from my previous 535 cu.in engine which are going to my new engine also. Super victor 4500 flange intake and ported MW Victor heads. That 535 made 750hp @6100rpm and 685 ft.lbs @5300rpm with 272/284 @0.050 0.660/0.630 mechanical roller cam. We pulled it only to 6200rpm on the dyno and hp curve was still climbing @6100rpm so I don't know if it would have made little more even, but didn't want to push it because it had stock block.. So heads are good for 572 too I think, my head guy says they are made to peak at 6500rpm in 535 cu.in engine, of course it depends what cam is used..
I'd be happy with 700ish hp and so that engine wouldn´t be completely dead at upper rpm range..
So if you guys could give me your opinions about compression and cam I'd be very happy.
Last engine was 11.5:1 and my new one is `12:1 on pump gas. Cam shaft will play a big roll in how much compression you will want.
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Re: Street 572 wedge build
[Re: Lancer273cid]
#3051569
06/18/22 07:13 PM
06/18/22 07:13 PM
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Joined: Jan 2003
Posts: 30,994
Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 30,994
Oregon
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If you are going to cruise in 6th gear then you'll have either a 1.87 rear ratio, or a 2.35 rear gear. So that puts you at roughly 2000 rpm for 80 mph depending on tire size. Dwayne is the guy to talk to about the cam but I'm thinking you need to stay in the 250 @ 050 range if you want to drive on the freeway at less than 2000 rpm. I'm not sure what the port velocity is going to be like at 2000 rpm with the MW Victor heads even with 572 cubes to feed. That engine might not like double overdrive, you'll just have to try it and see.
The Chevy 572/620 crate engine might be something to take a look at. Chevy went with 9.6 compression and the cam is 254/264 hyd roller. I haven't tested one of those engines but I assume it would work with an OD transmission since it is designed as a street rod type engine rather than a race engine. Chevy sells the 572/620 in their "connect and cruise" package with a T56 double overdrive transmission. Maybe jump on a Chevy board and see if you can find some reviews of that camshaft with the double overdrive in a car with your weight, tire size and rear gear.
Last edited by AndyF; 06/18/22 07:14 PM.
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Re: Street 572 wedge build
[Re: AndyF]
#3051698
06/19/22 12:03 PM
06/19/22 12:03 PM
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Joined: Jan 2003
Posts: 28,067
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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I worked with Dwayne on my mild 541 build. The application is decidedly different since it is a very heavy car with an automatic and 3.23 rear gear. We planned for the 518 OD transmission. The cam is a 235/241 hydraulic roller made to play nicely with the power brakes and still make silly amounts of torque through the mid range.
I've got the engine together now and trying to work out the scheduling to get it on the dyno.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: Street 572 wedge build
[Re: Lancer273cid]
#3051708
06/19/22 01:07 PM
06/19/22 01:07 PM
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Joined: Jan 2003
Posts: 19,360
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,360
Las Vegas
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With an aluminum block and aluminum heads you can get away with a LOT of compression on pump gas. The block will which away heat so quickly NONE of those ratios you listed would concern me as far as to much for the octane of the fuel goes. If it were me I would be shooting for the upper end of that scale if not higher. It is very difficult to build cylinder pressure in an aluminum block. Also if it were me I would look at a roller cam, solid preferable but hydraulic at least, they done have to be big to make power and not worry about lifter life.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Street 572 wedge build
[Re: AndyF]
#3051959
06/20/22 11:42 AM
06/20/22 11:42 AM
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Joined: Jan 2003
Posts: 11,708
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,708
Portage,michigan
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Those early A bodies have virtually no room( engine bay) for headers ( even the TTI ones suck to install ) on a small block. Or much else
Can’t imagine working on one with a big block, no room for nothing unless you chop up the car.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: Street 572 wedge build
[Re: AndyF]
#3052003
06/20/22 02:13 PM
06/20/22 02:13 PM
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Joined: Oct 2005
Posts: 268
Anchorage, Alaska
metallicareload
enthusiast
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enthusiast
Joined: Oct 2005
Posts: 268
Anchorage, Alaska
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edited I remember that thread. A little over 10 years ago. Be interesting to get an update on that engine and car.  I thought he posted an update somewhere, but all I can find is that it ran 10.9’s @ 124 and was still being sorted out. He hasn’t been on the Charger board in a year and hasn’t posted in 2 years 
Last edited by metallicareload; 06/22/22 04:09 AM.
440, 4-Speed, 3.54
1968, when Dinosaurs ruled the Earth
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