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440 Engine Performance - E Street, XR274, TM-7

M

Mic426

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Just wanted to post some information as I had a hard time finding info....Just finished my 440 build of the original 1969 440 Coronet R/T out at Mike Mastin's in Livonia NY, first break competed early this week, first go was 525HP and 575 ft#, with further tuning glad to report it reached the 600HP / 585Ft# @6000 RPM plateau at the crank....built using the following:

40 Over Bore, 0.25" decked Block
10/10 rebalanced original crank / 440 source Fluid Damper
New I Beam Steel Rods - Standard stroke
XR274 Roller Cam from Comp / Lunati Roller Lifters / PDq Roller Rockers / Comp Pushrods
E street 5090 heads - Mastin Ported and matched, swapped springs/etc. to match roller
Icon Forged Pistons with Skirt coating 10.7:1 / Moli Rings
MSD 6AL Box / MSD Blaster 2 coil with 440 Source Mech Advance Disty
Tarantula TM-7 Intake - 750-800 CFM Holley
Autolite Platinum plugs
ARP main bolts/ head bolts
Needed 2” of spacers to unleash the hp, the tm7 starts dying off at 5300 without them

Still working tune, another pull on Saturday....
 
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I don't see you decking the block 1/4", so I assume you meant 0.025" which is a normal amount.
 
Dyno sheets

EFD6A820-D704-447A-89CF-86079CD93CA9.jpeg 834591DF-B8CE-4D09-B2D3-817402B4C15B.jpeg
 
"Needed 2” of spacers to unleash the hp, the tm7 starts dying off at 5300 without them"

You picked up 75 HP ?

Did you play with total timing , jetting , or what else was done to get those numbers ?

I run the E Street 5090 Heads also
 
You may wish to check your A/F ratios ?
as well as a few other numbers.....
Just say'in....
no matter if you are happy.
 
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When you run a test at a rate of 1000rpm/sec, the air and fuel turbines lag behind quite a bit........ but I don’t think it would be enough enough to show the A/F ratio as being 5-6 points too lean.

I don’t know where the dyno is located or what the elevation is there....... but that sheet shows about a 17.5% correction factor(139.8lbs/hr, bsfc .274 = 510.2 hp), which seems pretty high for this time of year.
Edit: googled the zip code...... looks like the elevation there is a nominal 750ft. So, only about 250-300ft higher than the dyno here(if that’s the town where the dyno is).

I’d never hand a customer a dyno sheet like that, with really odd A/F ratio and bsfc numbers.
 
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Well, obviously the fuel flow is way off.
You’re not going to make 510hp from 139lbs/hr fuel flow....... well, not for long without torching parts.

The bsfc is merely the result of the “observed” hp and “measured” fuel flow.
If the measurement is wrong, the bsfc result is also wrong.
However, even if the fuel flow reading is incorrect, you can still determine what the uncorrected power was as long as you have the measured flow and bsfc result........ since the computer is just basing the bsfc off those two things........ observed power, measured fuel flow.

Obviously, if the load cell calibration is off, then the observed power is off, and the bsfc will also be off.

I don’t really like to comment on dyno sheets like that(because I come across as being “sour grapes)........ but that one seems to raise more questions than it provides answers.
 
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PRHeads said:
.. since the computer is just basing the bsfc off those two things........ observed power, measured fuel flow.
Click to expand...

Right. One, or the other, or both are wrong. And fuel flow is not complicated. And usually there are two. And where is the dyno operator fixing this stuff? Based on what I see, there isn't any reason to believe any of it. It started at 525, and the operator tuned 75 HP into a customers motor, but allows data like this? Hmmmmmm
 
I’ll just leave it at ......
If I dynoed it here........ there would be a lot of different looking numbers on the dyno sheet.
 
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