The 528 Hemi is on it's way to California

[IQ52]

After struggling with oil return and oil pans we were finally able to dyno the Hemi and hand it to the owner.
It is heading for it's home in a 1969 Road Runner that was featured on the cover of Hot Rod Magazine in 2009.

The idea was to have something that was reliable and would run from it's home at 6000' elevation, through the San Bernardino Mountains, to the beaches on the California coast.

Seeing no reason to push it any further on 91 octane and 11.7:1 compression, we were content to end the dyno sessions at.........

3500..............579 TQ...................386 HP
3600..............586........................402
3700..............585........................412
3800..............598........................432
3900..............608........................451
4000..............613........................467
4100..............625........................488
4200..............634........................507
4300..............638........................522
4400..............649........................544
4500..............664........................569
4600..............671........................587
4700..............676........................605
4800..............676........................618
4900..............673........................628
5000..............683........................650
5100..............679........................659
5200..............688........................681
5300..............685........................691
5400..............680........................699
5500..............684........................716
5600..............667........................711
5700..............667........................724
5800..............660........................728
5900..............656........................737
6000..............640........................731
6100..............640........................743
6200..............646........................763
6300..............633........................759
6400..............633........................772
6500..............622........................770

There should be more in the motor but we felt the need to keep the tune in a very safe range for the excursions to sea level.

Should you be curious as to what the torque curve would look like, I would look at any 8-1/2" X 11" sheet of paper, look at any straight edge of the sheet, and you will see a very close approximation of the torque curve.

 

[Hemirunner]

Nice Job! The torque curves of those things are amazing. I'm sure he'll be thrilled!

 

[Kern Dog]

How does a HEMI handle the high compression? Is the combustion chamber better suited to resist detonation even though there is no quench?

 

[tallhair]

Wowsers !!!

 

[Meep-Meep]

How does a HEMI handle the high compression? Is the combustion chamber better suited to resist detonation even though there is no quench?

I can tell you mine at 215 PSI cylinder pressure with what seems to be a street hemi cam pings like an SOB on pump 91.

 

[62 Dart Convertible]

Crikey, that customer is gonna need some traction!!! Able to post any pics of that Hemi ****?

 

[68 HEMI GTS]

sounds like a nice combo, what are you using for heads?

 

[IQ52]

How does a HEMI handle the high compression? Is the combustion chamber better suited to resist detonation even though there is no quench?

Greg,

Dad once told me, "Son, you gotta be smarter than the tools you're workin' with!" This was right after I'd managed to clock myself on the head with a 4lb hammer.

I said, "You sayin' your son is dummer than a hammer?"

His response, "Well?"

You have to be smarter than your static compression ratio. The pistons came with 10 cc bigger dome than advertised. The owner didn't like the thought of ANOTHER delay and wondered if we could still make the engine run safely on pump gas. "Yep!" we tell 'im, "We sure can!"

I personally cannot say the Hemi handles the high compression any better or worse than a wedge combustion chamber. What I do know is that high cylinder pressure isn't needed to make horsepower. This engine, even though it has 11.7:1 compression, has 150 psi cylinder pressure at 5000' elevation. This would translate to about 175-180 psi at sea level and no problem for pump gas when tuned correctly. It will be driven from 0-7000' elevation.

500 HP is deadly dangerous on the street. The 528 makes right at 600 lb-ft @ 3800 RPM, 500 HP @ 4200 RPM, 600 HP @ 4700 RPM and it is nowhere near detonation! Just an hour ago I tested a customer's 383 in a pickup truck with 145-150 psi cylinder pressure that tended to run-on when you shut it off. Even the Hemi doesn't think of doing that.

We could take the Hemi closer to the edge and make some MORE power. Cam and ignition timing, more RPM, I just don't see the need. Its for a street driven 1969 Road Runner. I think, it just might race pretty good with a smidgen of chassis work.

- - - Updated - - -

sounds like a nice combo, what are you using for heads?

Indy 426-1 Legend heads w/ stock size 2.25/1.94 valves and a little bit of porting by my son.

Lift...............Int OOTB...............VJ & porting

.100................69...........................89
.200...............136.........................166
.300...............205.........................231
.400...............267.........................290
.500...............311.........................346
.600...............343.........................376

 

[Kern Dog]

I wish you were my neighbor. I am constantly amazed at how you are able to get these high compression engines to run on pump gas.