Here is what Performance Trends software says.
Analysis Report for Street/Strip Engine with Desired HP Peak at 7500 RPM
Peak Tq =443. @ 5250 RPM 1.26 Ft Lbs per CuIn
Peak HP =503. @ 6750 RPM 1.43 HP per CuIn
Maximum Tq/CuIn is 1.259 Ft Lbs/CuIn.
This is somewhat high, indicating good performance, but will
produce high cylinder pressures and temperatures.
Maximum Exhaust System Backpressure 'Exh Pres' is .5 PSI.
This is typical for a street/strip vehicle with a free flowing,
full exhaust system. To simulate open headers, select the
'Open Headers' from the Exh System Type combo box.
Maximum Intake Manifold Vacuum 'Int Vacuum' is 1.6 ''Hg.
This is somewhat high and is limiting air flow and HP.
Maximum Fuel Flow 'Fuel Flow' is 293 lbs/hr GAS.
This is equal to 50.1 gallons per hour of fuel flow.
For an injected engine with one injector per cylinder, you will require
at least 37 lbs/hr injectors.
Mechanical Efficiency 'Mech Eff' is 74 %
at the current Peak HP RPM of 6750 RPM.
This is somewhat low and represents a real power loss in this
engine's current operating range. This can be improved by paying
close attention to details in the Short Block Specs menu.
The Maximum Average Piston Speed 'Piston Spd' is 4375 ft/min
at the Performance Calculations Maximum RPM of 7500 RPM.
This is EXTREMELY high (if you want to run this entire speed range),
requiring light, high strength reciprocating components.
A street/strip engine should limit Piston Spd to a range of 3000-4000
ft/min. However, even to run at 3000 ft/min or higher, you will need
'better than production', high quality reciprocating components
(connecting rods & bolts, pistons, etc.).
Maintaining low Piston Spd and Piston Gs are critical for 'keeping the
engine together'. OVER-REVVING PARTS BEYOND THEIR INTENDED LIMIT IS
UNSAFE FOR THE ENGINE, YOURSELF AND BYSTANDERS.
The Intake Runner Velocity 'Int AvgVel' is 358 ft/sec
at your 'Desired HP Peak RPM' 7500 RPM.
This is somewhat high and indicates you will need a larger Intake
Runner Diameter or larger Intake Port Diameter for less
restriction and stronger intake tuning.
For these engine specs, an 'Int AvgVel' of about 250 should work well.
If the 'Int AvgVel' is approximately 30-80 Ft/Sec higher than this,
you will likely improve torque below this RPM, but lose some HP.
The Inertia tuning of this intake is tuned to 6036 RPM,
which is somewhat lower than your 'Desired HP Peak RPM' of 7500 RPM.
This RPM is about where the torque peak should occur and should pro-
duce good peak torque. If you specify shorter and/or larger diameter
intake runners, you will likely gain Peak HP and lose some Peak Torque.
The Exhaust Runner Velocity 'Ex AvgVel' is 429 ft/sec
at your DESIRED HP PEAK RPM of 7500 RPM.
This is somewhat high and indicates you will need a larger Header
Primary Diameter for less restriction and stronger exhaust tuning.
Exhaust tuning is usually best with 300 ft/sec 'Ex AvgVel'.
At 3 different RPMs, Spark Advance 'Spark Adv' is retarded to avoid
detonation. Retarding Spark Adv does reduce performance, but allows this
engine to safely operate with this Octane fuel.
Estimated Idle Vacuum 'Est Idle Vac, ''Hg' is 7.2 ''Hg.
This is somewhat low, and will likely NOT idle well or provide
enough vacuum to run vacuum accessories for an engine which is used
occasionally on the street.
End of Analysis Report
