572 going to the Dyno

well Guys... going to the dyno tomorrow after a long journey. If some of you might remember it started as a 557 and after lots of oiling issues. Hopefully now it's correct. Here's the combo

4.500 bore bill Mitchell alum block
4.500 molnar crank
molnar rods
racetec flat top pistons
15:1 comp
indy -1 heads 2.25 int valves (heavily ported) (flow sheet attached)
1.6 ratio T&D rockers
Comp Roller (cam card attached)
indy 3x intake
pro systems 1050 dom (flows 1180) also have a 1400 cfm SV1 to try

I'll update with hopefully good numbers Wednesday

http://pic20.picturetrail.com/VOL1316/13778739/24824990/414091188.jpg

http://pic20.picturetrail.com/VOL1316/13778739/24824990/414091190.jpg

http://pic20.picturetrail.com/VOL1316/13778739/24824990/414091189.jpg

I hope things go well for you and that you have a good time.

sounds like 900+ ....good luck can't wait for the results!

Should make good power if everything is happy. That carb is going to hold back the peak power numbers if you care about that. The SV1 would be big enough if it works. Those can be tricky to dial in on a new combo.

Hope everything rocks. It'll be interesting to see. -1 heads, 2.25 int valve, same; cubic inch, int duration, lift at the valve, lobe separation, 15-1 flat top. 2 750 Eddy's, Indy cross ram. Obviously way different intake and carb, and iron block vs aluminum. Never dynoed mine. 9.0@150,3345#1500D/A
Doug

One of the ones I did was 14:1, cnc345’s(which flowed exactly the same on a 4.375 and 4.500 bore........385-ish), 1.7 rockers, 282/282-110 .460/.460(not the cam that was intended for this motor, but that’s a whole nuther story)made about 875hp with a port matched 440-2/w-4150-4500 adapter and an hp1150.
The motor was going to be run with the Indy TR and 2x750’s, and I wanted to see what it was worth.
Mild port match only...... it made 911hp with the TR/2x750 combo.
9.07@145, 3660lbs.

A subsequent cam swap and 2x 1050 4500’s netted a 2mph gain, but no better on the ET.

Of course........ dynos vary like crazy(and every dyno service will tell you how stingy their dyno is) so there’s no telling what kind of numbers you’ll end up with.

The main thing I like to do is make sure the timing and carb are dialed in.

Funny you say that. I was already told the dyno is very tight. I just hope for healthy motor after the dyno session and well 850hp would be nice too😁. The dyno shop is Cunningham competition in southern jersey. I’ll be sure to update you guys once I have the numbers.

I'll guess based on that build you should get around 925 HP.

Good luck Jack. Keep us posted on results. Ron

Nice Combo! Should be 900+ easily.

Fast69plymouth comments were interesting on the lack of ET gain with 2 Dominator's. My setup current runs two 750's and have been throwing the idea around of swapping them out for two 1050 Dominator carbs.

Interesting note, the 750's were Fast68Pymouth's dyno mules about 10 years ago and have served me well.

I tried 2 Quickfuel Holleys vs my box stock Eddy 750's. Maybe 1 mph but no ET improvement.
Doug

Assuming the flow numbers can be compared to what I get from the cnc345’s(meaning, the OP’s heads are better), the extra point of CR, the higher lift, and the 3x manifold....... I’d say it “should” be really close to 900hp with appropriately sized headers.

Good candidate for a Q16 test as well.

Because I like to do this stuff, I put your no's@that DA in and came up with 919fwhp
60 Foot E.T. : 1.25
1/8 Mile E.T. : 5.65
1/8 Mile Trap Speed : 120.23
1/4 Mile E.T. : 8.96
1/4 Mile Trap Speed : 150
slide rule will show less.

With an expectation of 850hp you will be VERY happy!!Dialing in SV1s are a bit of a chore to get right but they work well.

Can you jet either set of carbs up rich enough to slow the MPH down in the 1/4 mile? If you can your at the best setup for your motor If not maybe you should try that next
What sizes are the Quickfuel carbs ?

Yeah an engine like that would probably pick up 25 or 30 hp with Q16 if you're willing to put up with the cost and the nasty side effects.

I like trying it on that type of motor so you know:
- if it’s worth anything, and how much
- that you have the jetting and timing for it dialed in, in case you’d like to try it on some killer day when you’re trying for a new “best” at the track.

Good point, especially on the jetting. What I learned while working with Q16 was that most carbs couldn't handle Q16 with just a jet change. I eventually ended up with a custom 1250 carb from BLP that could switch back and forth from gas to Q16 for dyno testing. On that carb we changed metering blocks rather than jets since the internal fuel passages all had to be larger to work with the larger jets. That was a nice dyno carb, it would've been perfect for this 572.

I wonder if it’s 900hp o’clock yet.

That is the best time of the year!

I just got home. We had our challenges. My 2 1/8" tube headers hit the dyno frame so I had to use a set of 2" fender wells I took along so the exhaust ports measure 2.150 across on a 2" tube. That couldn't be helping things. To top it off my pro systems 1050 was giving us a fit and when I went to the truck the box I grabbed out of the garage didn't have the SV1. yup! 1 1/2 south in Baltimore... Ugg anyways after bolting on the dyno tuners 1150 dominator she made 865hp @ 7200 and 760 lbs tq @ 5800. I will post the dyno sheet with all the pulls once I get it. It's being emailed and I haven't got it yet. The motor is making really good power from basically 5200 - 7400. It was above 700 lbs torque @ 4800 and climbed from there. I'm thinking my good headers a carb that works and a vacuum pump and I'll be at 900. Anyways... I'll post the sheet once I get it. Thanks for all the interest.

Yep, sounds like a typical dyno day! I've fought thru a lot of those over years where stuff doesn't fit or the customer forgets something. Over time we stopped used customer supplied parts since they usually didn't fit or work. So now we use our own headers, carb, distributor, etc. to fire the engine.

Sounds like she'll make plenty of power for you once you get it in the car with your parts.

That’s really good power with using 2” fenderwell headers.

I’m sure it would have been real close to 900 with the bigger tubes.

On a pretty mild 542 with ez heads, going from 1-7/8” fenderwells to my dyno headers was a 40hp difference.

Yep that fender well header is a killer. Usually the tubes are long enough to plumb a corn field.

That hurt you more than the tube diameter. That and most FW headers have notoriously short collectors.

That's awesome Jack !! I definetly want to go when you take her to the track. Ron

The telling tale will be ET, mph once it's in the car. It didn't break. Recorded a fair number with room for easy improvements. What's the car weigh? Trans and gear?
Doug

This is basically how I feel. Lots of easy potential, it survived 9 hard hits and made promising numbers. I need to figure out how much fuel I need also.

The car is a '68 cuda, 727, stall I'm thinking is gonna fall around 6000, dana 4.88 w/ 33" slicks

I have had 5700, 5900, 6100 flash. The 5900 has been the best, 6100 was almost as good. Tried 4.10 and 4.30 with 10.5W x 31. Both about the same.
Doug

4.88 gear seems like a lot with that engine. What is your trap speed going to be with that much power? 145 or 150 mph? Those gears will have you spinning 7500+ rpm. What did the torque curve look like on the dyno? I'm guessing peak torque was in the 5500 to 6000 rpm range? HP peak was probably less than 7000 rpm wasn't it? You might need to drop the gear ratio down to 4.56 or even 4.30 to avoid spinning it too hard in the lights.

I agree. Plus hitting a 4.88 gear with that much torque will be hard to control to say the least. Good job on the motor though. That is pretty typical of that engine variety at least the ones I have done.
Todd

I would guess with the 33" tall tire a 4.56 would be about the right gear given the combo - that is assuming 1/4 mile racing if it's running 1/8 mile only - I would go with the 4.88 and let it eat

My combo; 4.56 gear, 33x15x15 goodyear 2078 (105 roll Out) 150 mph logged 7450 trap rpm, 9.5 lennys, stall 6,000 rpm to 6200. I would put a 4.30 in it, no more. If you want to run a 14x32, then 4.10.
With a 2.45 low and a 4.56 gear, the SLR is 11.17, which is awfully high for a 572. Take crank torque at 6,000 x 2 (converter) x11.17= about 17,000 at the hit to the axles on launch. Digest that for an instant. Plan on a transbrake?

That's the same thing the dyno owner and engine builder said. My plan is to more then likely take some gear out of it.

Andy, your pretty close peak torque was 5800 and peak hp 7200.

7200 rpm for a power peak is pretty impressive given the fact that you had fenderwell headers and a borrowed carb. I'm assuming the intake is "out of the box"? With a ported intake, a big carb and the correct headers you'll pick up at least 50 if not 75 hp.

Good luck with the car, it should fly. Even if you have too much gear in the car you can just run it at 3/4 throttle until you get comfortable with the extra power and then back off the gear when you're ready to go full throttle.

One thing to watch out for is converter slip as you reduce gear ratio. A low 9 second car that runs at the local track has been fighting that. He dropped from 4.88 gears to 4.30 gears and the trap RPM barely budged since he had more slip. So you have more than one variable in the equation.

Thanks Andy

The intake it matched to the heads already. I have mazzaloni 2 1/8" step headers and figuring out the carb now. I had the same thoughts about feeling it out. Definitely not a bring it out on the brake and let it fly combo...

I'll be asking lots of converter questions soon enough.

Hopefully I'll have the dyno sheets soon to post. I haven't received them in my email yet.

Wrong headers on the dyno or not, that engine makes enough steam to snap my junk in two.

Jack your dad told me today you guys plan to have it in the car by February. And you are putting in it at his house. Let me know when you guys put it in as I would like to stop by and check it out when you put the eng in. Thanks , Ron

Will do Ron

Finally received my dyno sheets. Here they are for viewing pleasure.

Are the oil temps real or room temps?

Cab, they were room temps

I was hoping so, if they weren't and you had straight weight or any weight above 5W in it the motor should gain power with warmer oil