Those chambers were not done by me, if I had done it the cnc program would have had nice smooth contours and radius' to the seats and deck, he sent me the pictures to get a second opinion.

We have a cam in there that was designed by our good friend Steve Cole of TTS Powersystems, who also does the tuning. The reason why we are ahead of the others is due to his tuning ability - there is no one who can compare IMO.

The problem with the early heads is that they are IDI which is not as efficient as direct injected, the cummins like you work on are mechanical injection, but are also direct injection, when international switched to direct they jumped right into computer controlled HEUI injectors. As such I have not even tried to bolt a set of those heads on.

 

Is that whole series of engines the same?
What about the Navastar boat engine?
I have friends that work for I.H. here in GA maybe there is another D.I. head that is mechanical that can be used??????

They will catch you soon enough

Denny

 

All engines in that family are the same except for the two different camshafts, the marine one is a little higher output. There are no mechanical injection heads. If we wanted to make huge power it would have been easy to follow the leader and build a cummins, making 900+ on those is easy it's just $, we wanted to do the R&D and show what the V8 PSD could do...but at this point to make more power we would need to spend some serious coin and my intrests lie elsewhere, we developed many parts that are in use around the country and so we accomplished the main goal. I think next year he wants to run the new generation factory twin 6.4L PSD so we will have a whole new motor to learn on.

 

Why did they make the engine smaller?
Have you seen one yet?

Lets start a new thread about this!!

Denny

 

The 6.4L will be replacing the current 6.0L - it's basically the same motor - just displacement increase.

94-97 7.3LNon-intercooled Direct injected HEUI GenI Powerstroke 195hp/425-450tq
99-02 7.3L Intercooled Direct injected HEUI GenI Powerstroke 235-275hp/500tq
02-present 6.0L Intercooled Direct injected HEUI GenII 4 valve powerstroke 325hp/600tq

 

Emissions requirements forced the displacement decrease.

I have built a couple, but not for performance apps. They have much more potential than the 7.3L as far as hp/cubic inch, but suffer from 4 head bolts per cylinder as opposed to 6/cyl on the 7.3L sealing high boost is tricky but can be done.

If I owned one of the new trucks I would be more into the performance stuff for them, but I am selling my 2000 7.3L diesel to pay off the GTO.

 

I found this post on Speed-Talk Forums


a back-to-back Dyno test on SBC
cast-iron Bowtie Block -vs- alum Block
everything exactly the same, just blocks were swapped
there was 30 HP difference at 600 rpm/sec

another back-to-back Big Block Chevy test = approx 40 HP

another back-to-back SS Hemi test on Cylinder Heads only
with cast-iron -vs- aluminum = 12 HP more w/cast-iron
same flow numbers + port vol CC's

the above were actual Dyno tests,
for theoretical HP/TQ differences between alum -vs- iron Blocks
by using FlowBench CFM Numbers -vs- what HP the different
block materials made on the Dyno =>

the results were=> for the same Flow CFM numbers,
i have yet to see an aluminum block engine make
the same HP/TQ that the cast-iron Block engine makes.

so far in all my Data,
the cast-iron Block always 100.0 % PerCent of time
makes more HP/TQ than an aluminum block

the last Dyno test was a recently as 2 months ago
with Brodix SBC and SB2.2 Heads
again the aluminum Block did not make as much HP
as the Flow Numbers suggested, about exactly the 30 HP
i found in those back-to-back Dyno test i did about 10 years ago
with another manufacturer's alum block -vs- Bowtie cast-iron.

to date, i have never seen an aluminum block make
1-the same exact power/torque as cast-iron
2-make more HP/TQ than cast-iron

it has always been LESS so far .
_________________
Meaux Racing Heads
MaxRace Software
ET_Analyst for DragRacers
www.maxracesoftware.com

Just goes to show you that sometimes what I say is correct

Denny Schmidt

 

Larry Meaux is on this board also.

I wonder how much coatings would help the aluminum heads?

Was the increase in horsepower enough to offset the increase in weight?

 

Denny it's good to see you say that the iron block makes more power. Smokey Yunick would be proud

 

Audio

Larry Meaux says he tried the coatings and got some of the power back, unfortunately the loss is not entirely from the heat-loss its from the instability of the material. Darin of R-M Engines says that the only block-heads that can successfully produce the same power as a its iron replica is the solid billit stuff.

Where are you in relation to Elk City?

Denny

 

113 miles according to Google

I'm still betting that the weight lost by going from iron heads and block to all aluminum will offset the power difference.

 

Audio

An all aluminum Chevy weighs 460 lbs complete without the flywheel - I'm not sure but I think an all iron one weighs 660.

The rule of thumb in drag racing is that 100 lbs = a tenth
I think that it takes about 90 HP to accomplish the same thing, depending on the actual weight of the car. Somewhere around here I have the formulas for figuring all that stuff.

So you may have a point that the weight difference makes up for the power loss.

Denny@JDS Induction Products

 

The scary thing is a dry sumped road race LS motor is under 360lbs fully dressed!!

Bret