512 Stroker Dyno time

[comet_666]

Put the 512 on the dyno today!!

I think it's 10.75:1 compression. Still getting final details.

4 pulls, still waiting on the print out which I will post along with video

580 HP @ 5400 RPM

660 TQ @ 3900 RPM

[Just 6T9 CHGR]

Sweet!  Gobs of torque down low

[Back N Black]

Nice!!! do you have the spec of your build?

[comet_666]

Video

https://www.youtube.com/watch?v=K42AgSQZGwg  - Pull 3

https://youtu.be/zzUd914sV5U - Pull 4


Build:

Eagle Comp rotating assembly 21203
https://www.cnc-motorsports.com/eagle-21203-bb-chrysler-440-520-stroker-competition-rotating-assembly-kit-11-3-1-mahle-flat-top-pistons.html
Edelbrock rpm Heads
Performance cam brgs
Edelbrock Intake rpm 7193
ARP Main Cap Studs 140-5402
ARP Head Bolts 145-3706
Brass soft Plugs
Felpro Head gasket 1009
Felpro intake Valley Peformance
Cam Button and Plate
Howards Hyd Roller Cam 723445-10
Comp Pro Magnum Lifter Hyd.Roller 8921-16
ARP SS Intake Bolts
COMP Cams Pro Magnum Shaft Mount Roller Rocker Arms 1621-16
Timing Chain set Roller thrust brg.
Oil pump 63HP Melling Select
Oil Pump Drive Brass gear for roller gear p3690875
Manley5/16 x.08 Pushrods
High Flow Water Pump Milodon 16360  
Stock Housing
Edelbrock Performer RPM Street Fuel Pumps 1723
Polished Valve Covers SUM440350
Carb  Quick Fuel HR850
Stroker Windage Tray
Alternator   8509DSP
Firecore RTR Dist   CWSFC-1007B
FireCore Performance CD R2R Mini Coil CWSFC-CDM
Converter   729330ATI
3.23 gears   YG C8.42-323
OBX Headers Primary Tube  1.8 " OD
Wizard 26" radiator 1640-100  / 1.25" tubes

[PlainfieldCharger]

That sounds pretty mean!! That will be fun to drive.........

[myk]

Good times for sure! 

[firefighter3931]

Very nicely done ! 

That'll be a handful on the street   


Ron

[Chargerguy74]

Nice!

[comet_666]

I have not driven this car in almost 10 years and it was nothing like it is now. I am a bit concerned about my lead foot and my girlfriend is actually a bit scared to ride in it. 

[XH29N0G]

I have not driven this car in almost 10 years and it was nothing like it is now. I am a bit concerned about my lead foot and my girlfriend is actually a bit scared to ride in it. 

Well then, take your time to get used to it, and enjoy.   

[68CoronetRT]

What headers are those?

[comet_666]

OBX

[500Jon]

All that lovely power with a Vac Sec and a mech fuel pump!

ENJOY!!!

[chapel40]

Which block is this? 400 or 440?

[BLK 68 R/T]

Which block is this? 400 or 440?

It's a RB (440) block. You can see the machined pad on the front left side of the block.

[Tmb84]

looks nice

[comet_666]

Thanks!!

[chapel40]

Thanks for taking the time to put your engine on here, I have used some of the information for the one I'm building.

[chapel40]

What is the stall speed of your torque converter?

[comet_666]

I believe 3000-3500

[chapel40]

Did you get it installed in the car? How do you like it and how does it perform?

[alfaitalia]

Completely unsilenced big bore motor, dynoed outside (effectively!)  noise and fumes just venting to the outside world. That shop must be real popular with the neighbours!! Never seen a dyno over hear that wasn't in a sound deadened room with exhaust extraction and filtration and safety guards in case of catastrophic rod or flywheel failure and the operators behind the glass! You Americans and your fun attitude to heath and safety! Long may it continue...LOL!

[comet_666]

Did you get it installed in the car? How do you like it and how does it perform?

Yes, I have around 3500 miles on it as of now, drives great! With 3:23 rear gears I can cruise at 70 all day and light them up at will.

[comet_666]

Completely unsilenced big bore motor, dynoed outside (effectively!)  noise and fumes just venting to the outside world. That shop must be real popular with the neighbours!! Never seen a dyno over hear that wasn't in a sound deadened room with exhaust extraction and filtration and safety guards in case of catastrophic rod or flywheel failure and the operators behind the glass! You Americans and your fun attitude to heath and safety! Long may it continue...LOL!

you know..I have watched tons of shows about engines and have seen many on dynos and at no time did it ever occour to me, until you mentioned it, that mine took place exactly as you described lol

[375instroke]

I've only owned stock Mopars.  I'm not used to driving 500HP cars.  I see people commenting on stroker builds with comments like "Dual plane, 850CFM, tiny 1-3/4" headers? Jesus, put a cork in it, why don't you." "You need at least 250°@.050", or it'll fall on it's face."  "You need solid cams if you want to make power."

You got a dual plane, 850cfm carb, 1.8" headers, and 235° @.050" hyd. roller cam.  Are the RPM heads the smaller Edelbrock heads?  I see so much hate on "tiny" specs like this, on other posts, and you're making 580 HP @ 5400 RPM and 660 TQ @ 3900 RPM!  Those look like outstanding numbers to me.  How can this not be a blast to drive?

[comet_666]

I believe the heads are part #60189
It is a blast to drive for sure, i can spin the tires at 50mph which is not necessarily a good thing lol

[Challenger340]

21203 Eagle Kit is 4.375" Stroke for 520 Cubic Inch ?   

[comet_666]

yessir, I think it used to say 512-520

[Challenger340]

yessir, I think it used to say 512-520

It probably did ?
and no matter, my only purpose noting was that the 4.375" Stroker Cranks can sometimes be a bit tougher to clearance the Block for over by the Oil Pickup Boss ? than the more popular 4.250" 512 Stroker Cranks.

Nice Engine 512/520 nonetheless, good job 

[comet_666]

I believe the link to their site used to say 512-520, Looks like they corrected it, I actually think I have a screen capture of web page when it said 512-520
i'm pretty sure its a 520, my builder did not have issues clearance for pickup. As a matter if fact he wanted to get the biggest kit available as it was the same price.

And thank you for the complement, it really is fun to drive.

[chapel40]

What is your cut off for rpm? are you running it to 6k? More? just wondering if it gets valve float up high. I am building my engine similar to yours with a little bigger hyd. cam and wonder if I am making a mistake. Probably should have used your cam. My cam is spect. at a couple hundred rpm higher than yours.

[chapel40]

Have you brought it to the track or timed it?

[comet_666]

I think the highest I got it was to 5800 RPM on expressway actually last week. I punched it at 3000 rpm (70mph) and it shot to 5800 and got a bit loose in the rear so I backed off.
I have never brought it to the track. I should mention I am running fi-tech on it now.

[Challenger340]

What is your cut off for rpm? are you running it to 6k? More? just wondering if it gets valve float up high. I am building my engine similar to yours with a little bigger hyd. cam and wonder if I am making a mistake. Probably should have used your cam. My cam is spect. at a couple hundred rpm higher than yours.

There is absolutely no way to determine what any particular Hydraulic Roller Camshaft will rpm to in an RB Mopar Engine, mainly because these Blocks were never BUILT or intended to run a Hydraulic Roller Lifter.... the Lifter Bores are far too short.... and the Oil gallery far too LARGE where it intersects the Lifter Bore.... with far too SHORT a wear area in the Lifter Bore below that Oil gallery.

In a nutshell what I'm saying is this....
on a  Block with very little Lifter Bore "wear"..... a particular Hydraulic Roller Cam may be capable of maintaining good power right to 6,000 rpm ?
then,
Same Cam installed in a Block with worn Lifter Bores.... may be all done making power at 5,200 rpm ! and no amount of tuning will increase the Lifter Pump up that can be maintained in the "Hydraulic" Lifter in the worn Bore !

That's what happens when you are trying to "balance" a Roller Cams more aggressive Lobes.... faster/harder opening & closing.... against... the ever also increasing V/Spring pressures required to keep things in contact with the more aggressive events...... with a "Hydraulic" plunger as the weak link ?
There is a point where the Oil pressure takes the path of LEAST RESISTANCE ..... and if that is OUT "around" the Lifter Body in the WORN Lifter Bore as opposed to INTO the Lifter to keep it pumped up ? = FAIL to maintain the intended Lobe profile or rpm.

[comet_666]

if I kept the 3.91 in the car instead of swapping to 3.23 maybe i would have an issue but not the case here.

[Alec]

I'm building one now, what size is your cam?

[comet_666]

https://www.howardscams.com/hydraulic-roller-camshaft-1959-1980-chrysler-383-440-2500-6400-howards-cams-723445-10