This in my opinion is the perfect build for a 400 in a truck for everyday use.

https://www.ford-trucks.com/user_gal...=40868&width=0

https://www.ford-trucks.com/user_gal...=40869&width=0

 

It is really hard to read. I can see the numbers, I think. I think the torque is 500lb-ft @2000 and the Horsepower is 450@4000, I'm not sure though. I couldnt read the first link, it was really blurry.

 

Someone did not read the Dyno book on how to use DDyno. They have used the hyd roller lifter setting instead of the solid lifter setting the book says to use for street grind HR cams. The HR setting is only used for very wild racing cam profiles. Unfortunately this makes the numbers pretty bogus. It looks like they bumped the compression ratio up but without being able to read the cam duration numbers it is hard to tell what the cam is doing. From the torque curve profile it does not look to be a radical cam. The lift numbers look like they might be pretty bogus also but I really can't tell.

 

I have to redo the pictures so that they are readable.

 

Dyno 2000 says to use solid lifter or hydraulic lifter profiles if you have a mild street grind and are using roller lifters for reliability. The grind that I used was a modification of a Comp Cams 270HR from the Cam files and the results should be correct.

 

I have to print the output from Dyno 2000, then scan it in to get a jpeg. Then use Photo Studio to shrink it to 320KB, so I can post it in my FTE Gallery. After all that manipulation the text is unreadable.

The motor is a 400 +0.030 with dished pistons and CHI-3V heads. The valves are I=2.150" and E= 1.650"

The Static Compression Ratio is 9.41:1

The Carb is 600 CFM, and Intake Manifold is a Dual Plane Intake.

The Exhaust System is Large-Tube Headers with Mufflers.

The Camshaft is a Custom Hydraulic Roller 262/272 seat-to-seat duration, dual pattern with 0.566/0.566 lift.

The Lobe center is 110, Intake centered at 106 degrees.
The Valve Overlap is 47 Degrees.
Timing is zero degrees.

IVO (BTDC) = 25.0 IVC (ABDC) = 57.0 DEGREES
EVO (BBDC) = 70.0 EVC (ATDC) = 22.0 DEGREES

TORQUE = 497@2000, 506@2500, 510@3000, 513@3500, 508@4000, 495@4500.

 

danlee, can't you just take a screen capture of it and convert that to a jpeg?

 

Use the solid lifter setting not a hyd lifter setting for the proper ramp rates. While the hyd lifter setting can be used it produces ramp rates that are lower than the solid lifter setting due to leakdown. My Desktop Dyno book says not to use the HR setting unless it is a racing application. The solid lifter setting probably produces "numbers" that are slightly lower than actual but the HR setting is way off.

It looked like you were using a .666 lift on the cam from that blurry image.

small tube headers <= 1.05 x Ex Valve dia.
large tube headers >= 1.2 x Ex valve dia.
The dyno book does not say what to do with those values that are in between those numbers.

You really need the desktop dyno book to use the dyno settings properly. The book explains each one in detail. I consider the program alone to be worthless without it, but then you have to read the book in depth, and read it again when setting up a simulation... My poor book is well worn.

Without the book the "numbers" produced are just "numbers".... I was not happy with the "numbers" until I was able to reproduce the factory dyno numbers on several old ford engines with reasonable accuracy.

Careful work with the dyno program is why I chose the 260/268HR camshaft.

 

How is this?

 

I have a Dyno 2000 Cam Disk. I am loading .cam files for most cams from Comp Cams, Crane, and others. When I load a 32-421-8.cam file(270HR), I get the proper ramp rates for that grind. Dyno2000 displays that as a Hyd/Roller. I am not inputting the ramp rates by selecting the cam type. I believe these numbers should be correct even though I changed the duration slightly, the ramp rates should be valid.

 

still hard to read, darn jpeg compression! Can you get a gif small enough in size to post? or use less compression on the jpeg?

 

According to their book that would be an error on the cam disk. The book explains it fairly well. That cam disk was fairly worthless.

 

The following text contains paragraph from the Dyno2000 Manual.

"The Dyno2000 uses increasing
Valve train acceleration to model
hydraulic, solid, and roller-lifters.
This is a good assumption, since
most cam profiles have predictable
valve acceleration rates.
However, some roller-lifter street
cams do not to have high acceleration,
but instead use roller
lifters to optimize reliability

In these cases, choosing
roller lifters will produce optimistic
simulated power curves. So, to improve
program accuracy, ask yourself if the
camshaft you are modeling fits the following
application-specific description
before you make a lifter selection:
Menu Choice Application
Hydraulic Flat-Tappet Street/Mild Perf.
Solid Flat-Tappet HP/Mild Racing
Roller Very HP/Racing
If the cam you’re modeling is a roller lifter
grind but incorporates a mild-street
profile, select Hydraulic or Solid Flat-Tappets
from the menu, since this choice
will produce a lift curve that best matches
a mild street camshaft. On the other
hand, if the cam is a high-performance—
or high acceleration—grind, select Solid
Lifters since this will model the faster acceleration
rates of aggressive performance
grinds. If you are modeling a
solid-lifter racing cam, like some “mushroom”
lifter grinds, the Solid Lifter choice
may underestimate the acceleration rate
of these competition camshafts.

The three lifter choices establish a “ramp-rate” model for the simulated valve-motion
curve. The lowest acceleration is assigned to Hydraulic Flat-Tappet Lifters. The next
highest acceleration is applied to Solid Flat-Tappet Lifters. The highest acceleration is
reserved for the last menu choice: Roller Solid Or Hydraulic Lifters."

The only way that I know what the ramp rates are on any cam is by the spring pressure required when they are closed. Comp Cams recommends 125 lbs dual springs for a 270HR. The Predator cam that I am using in my motor requires 145 lbs dual springs.

Since this is a custom cam, the ramp rates can be specified as well as the lift and duration. So with the correct ramp rates the numbers posted are possible.

The next question is What is the effect of a lower ramp rate on the engine being modeled?

• Torque = 478 @2000
• 485@2500
• 488@@3000
• 489@3500
• 483@4000
• 468@4500
• HP = 420@5000

 

It drops a bit doesn't it, about 20 lb-ft. There is some more info in my book also but that covers it fairly well except for a small error that does not match my book. The opening closing rates etc for the 470HR have been modeled by Comp Cams to reduce spring harmonics etc etc and should fall into the mild street profile. I would be thrilled with the higher torque but I won't kid myself that it is some high performance aggressive design. I wouldn't want an aggressive design in my engine anyway. I am looking for durability.

DD uses "assumptions" for ramp rates and the ramp rates for cams are carefully designed and do not show up in the opening and closing specs.

Of course if you want to add back in the torque saved by using roller lifters and rockers back in you might get that 20 lb-ft back The dyno program has no provision for roller valve train gains. The book describes them as "negligible".

The DD program takes into account the piston friction but then again those are general assumptions it uses since we all know that rod angles etc can make a difference

DD is a fair tool but it has limitations.

 

It's to bad that I don't have a way of posting the DD 2K screen data. It loses too much resolution when I shrink it to 320K.

BTW, I just got my 400 running. I just need a dry day to get it on the road and see how it runs. The real test is in the seat of the pants.