Somebody wanna help me with this? I know its another one...

[69Rcode_Mach1]

Hey i was wondering if its okay with if you someone would help me get an estimate on my plans with desktop dyno. Ive never done this before so i don't know what to expect. I am at 4500 ft elevation and dynoed at 175rwhp bone stock. I have a 1969 mach 1 with a 351 Windsor standard bore. I plan on running afr 185's, a 10.5 to 1 comp ratio, holley 750 cfm carb, compcams 280H Part # 35-226-3, compcams promagnum roller rockers, and performer rpm airgap. Also if its possible could i see what results this would yield if i stuck with my stock 600cfm holley 4010 carb. Thanks in advance.

 

[69Rcode_Mach1]

ttt

 

[sg465]

i used engine analyzer and got 395hp @ 6000rpm. The 600cfm killed it, down like 30 hp. If the program cooperated with me I was gonna try emailing the chart but that may have to wait. I tried the same combo earlier for my 69 build-up and what I didnt like is the program gives too much credit for a single plane intake, like 40hp. I did standard conditions, but Ill try again later for here in Utah

 

[69Rcode_Mach1]

Thanks Dude yeah if you can send the charts to [email protected]

Also if it wouldn't be too much trouble could you see what power i would get from the 750 cfm and victor jr. heads together on my combo. I have been thinking of going with the victors.

Also are you up in Utah? It would be awesome to get to know more stangers in my area if so send me your IM name also well get in touch.

 

[ratio411]

...what I didnt like is the program gives too much credit for a single plane intake, like 40hp...

I use the same program...

My comment on this is that I have experience with single plane vs dual plane (Perf. RPM) and reverted right back to single plane when I found out it really did make a huge difference in real world street/strip driving.
Careful intake selection will give you minimal low end losses and HUGE top end gains with an SP intake.
I am a fervent believer in SP intakes.
My .02
Dave

 

[69Rcode_Mach1]

I see but most sp intakes are too tall for me. Im trying to keep the stock aircleaner housing under my hood thats why i went with performer rpm airgap.

 

[ratio411]

Analysis Report for Street/Strip Engine with Desired HP Peak at 6000 RPM

Peak Tq =419. @ 4500 RPM 1.19 Ft Lbs per CuIn
Peak HP =406. @ 5500 RPM 1.15 HP per CuIn

Maximum Tq/CuIn is 1.191 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 1.1 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 1.1 ''Hg.
This is somewhat high and is limiting air flow and HP.


Maximum Fuel Flow 'Fuel Flow' is 231 lbs/hr GAS.
This is equal to 39.5 gallons per hour of fuel flow.
For an injected engine with one injector per cylinder, you will require
at least 29 lbs/hr injectors.


Mechanical Efficiency 'Mech Eff' is 75 %
at the current Peak HP RPM of 5500 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 3500 ft/min
at the Performance Calculations Maximum RPM of 6000 RPM.
This is Very 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 314 ft/sec
at your 'Desired HP Peak RPM' 6000 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 260 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 5707 RPM,
which is close to your 'Desired HP Peak RPM' of 6000 RPM.
Since this RPM is about where the HP peak should occur, peak HP
should be good. If you specify longer and/or smaller diameter intake
runners, you will likely gain Peak Torque and lose some Peak HP.


At 4 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.

End of Analysis Report

 

[ratio411]

Peak tq: 419
Avg tq: 327
Peak hp: 406
Avg hp: 254
Vol eff: 100.8%
Carb size seems very good, it gets 100% effieciency for most rpms.
One word of warning, the RPM A/G is VERY TALL! It is taller than the RPM and close to Victor height.
This is not so on most engines, but for the 351w it is very tall.
Dave

 

[69Rcode_Mach1]

Wow thanks ratio 411. Those are around the numbers i was expecting. Is that set for the altitude in utah or is that just for sea level. Also is that for the afrs or the victors and im guessing its the 750 cfm carburator. Thanks again.

 

[ratio411]

No, sorry, I didn't do anything for altitude...

The AFRs were not modeled specifically in my version of the program...
I used the Canfields, which were 186s.
Carb was 3310 Holley.
Dave

 

[69Rcode_Mach1]

Any chance of seeing what a set of victor jr.'s and the 750 carb would do. My goal was to hit 450 hp at sea level and around 400 at my elevation which is 4500ft. Feasible? What do you think? If you can email me the charts that would be awesome but you don't have to.

 

[sg465]

o.k, still cant figure out charts- I can scan em and send em but maybe tomorrow. With a vic jr., 280 hyd. roller cam, 1 3/4 instead of 1 5/8 headers I got 452 hp @ 6000. Now with current SLC conditions of DP @ 32, Barometer 30.08(and rising), and 26* humidity it fell to 390hp using our 91 gas. I used flow data on the 185s, if you could narrow down a cam for your purposes I could mess with it more.

 

[69Rcode_Mach1]

sweet that was the numbers i was looking for. Yeah if you can hook me up with the charts that would be excellent. I got 1 5/8 headers but o well that will get me more torque so its a bit of a trade off.

 

[ratio411]

...280 hyd. roller cam...

280 H is a flat hydraulic.
280 HR would be the hydraulic roller.

 

[ratio411]

Just a quick look at my future combo...
I won't give away 'the farm', but:
362.49 cid
10.085:1
Aftermarket W heads
Off the shelf intake, carb, headers, etc...
Pk tq: 499
Avg: 348
Pk hp: 537
Avg: 289
Vol eff: 108.4%
HP per cube: 1.48

Analysis Report for Street/Strip Engine with Desired HP Peak at 6000 RPM

Peak Tq =499. @ 5000 RPM 1.38 Ft Lbs per CuIn
Peak HP =537. @ 6000 RPM 1.48 HP per CuIn

Maximum Tq/CuIn is 1.377 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 .6 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 Fuel Flow 'Fuel Flow' is 267 lbs/hr GAS.
This is equal to 45.7 gallons per hour of fuel flow.
For an injected engine with one injector per cylinder, you will require
at least 33 lbs/hr injectors.

The Intake Valve Mach # 'MACH #' is .396
at your 'Desired HP Peak RPM' of 6000 RPM.
This is low and indicates perhaps too much intake cam duration.

The Maximum Average Piston Speed 'Piston Spd' is 3500 ft/min
at the Performance Calculations Maximum RPM of 6000 RPM.

The Intake Runner Velocity 'Int AvgVel' is 316 ft/sec
at your 'Desired HP Peak RPM' 6000 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 5515 RPM,
which is close to your 'Desired HP Peak RPM' of 6000 RPM.
Since this RPM is about where the HP peak should occur, peak HP
should be good. If you specify longer and/or smaller diameter intake
runners, you will likely gain Peak Torque and lose some Peak HP.


Estimated Idle Vacuum 'Est Idle Vac, ''Hg' is 3 ''Hg.
This is Very 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

 

[69Rcode_Mach1]

wow thats awesome is it gonna be streetable or just drag? Also your not going to go stroker? Itll be tough to make that power without a stroker.

 

[ratio411]

The cam is based on a Comp 292H. A solid roller doesn't do alot for peak, but brings the average (low end) way up. I just haven't sold myself on solid roller yet.
The engine is a little soggy on bottom, but not horrible.
It will need a toploader or 2500+ stall with 3.70-4.11 gears.