[AMC-List] Machine Shop Specs and dyno output
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[AMC-List] Machine Shop Specs and dyno output
- From: "Dan Curtis" <d.curtis@xxxxxxx>
- Date: Sat, 20 May 2006 11:43:03 -0700
Below are the specs from the machine shop that built out my latest 390
engine. As mentioned before in an earlier note, this engine dyno'd with 459
max hp with a 439 average (456.4 and 437.5 with the alternative, smaller
carb) and 448 max ft lbs of torq with 418.2 average (451.5 and 416.3 again
with the alternative, smaller carb) which is quite an accomplishment for a
moderately worked 390 with stock compression and no nitrous, stock but
worked heads and a pretty standard carb based fuel delivery system. Reid's
Automotive, machine shop I used, builds a lot of racing engines and has a
calculator that determines what an engine should do in the quarter mile.
They determined that at a weight of 3250 pounds and with optimum gearing and
traction, I should be able to turn 10.87 in the quarter mile. Pretty
amazing!
It is being shipped this week and I hope to install it before the fourth of
July.
All of the work and parts below represent a total of about $6,500 in parts
(including a bunch of perfectly good used parts lost by #$^#$^ DHL worth
about $1500 to replace) and $3,500 in machine shop work PLUS a previously
but improperly rebuilt, balanced and blueprinted 390 (with the wrong, lower
compression 401 pistons in it).
I also purchased a set of ported and polished 291C heads for $700 off eBay
that were supposed to be ready to go from someone who had previously
purchased them for $1100 but never used them. When they arrived at Reid's
they determined that the heads had previously had one too many valves jobs
which resulted in the edge of the valves having a knife edge which prevented
them from being redone as they were no longer in very good shape. Ready to
go...yeah right! So now the heads have brandy new stainless steel 202 and
168 valves and will be good for as long as I will have any use for them.
Regretfully, I later found another set of 291C head that had been totally
redone with brand new valves, studs, guide plates, high tension double valve
springs, retainers and guides and although they were not ported and
polished, they were cc'd and probably would have only had nominally lower
volume flow than the other heads . I picked up that second set of heads for
$550 which would have been a heck of a lot cheaper that what I have in total
in the other heads that were supposed to ready to go!
Initially I purchased an original group 19 AMC logo'd R4B and Holley 950
three barrel setup but in the end the I ended up putting in enough
performance goodies in the engine that I realized that the R4B was not
sufficient enough for what the motor was capable of thus the Performer RPM
AirGap manifold. The Air Gap pulled strong right up to 6700 RPM on the
dyno. If anyone is interested in a fully bead blasted AMC logo'd R4B with a
custom PCV valve shroud, please let me know. It will be headed to eBay one
of these days.
The following are some of the specs from the two dyno pulls. One had my
trusty old 750 Holley on it that I have had since 1973. My brother and I
rebuilt it in the early 80s with a 750 kit and pulled all of the choke
mechanism out of it to give it maximum flow. That carb was rebuilt by Reid's
but this time has the anti backfire power valve saver now installed. As you
will see in the dyno results, it is essentially an 850 as it only had
slightly lower volume pulls than the 950 three barrel Holley that I also had
rebuilt by Reid's. Finally, the engine was dialed in on the dyno for
advance curve and the carb was jetted for proper fuel burn ratio so as to
not be dumping too much gas into the engine. With what I spent on this one,
I don't even want to think about trashing it by not having it set up
correctly.
March 3, 2006 4:38 PM 85% efficiency 29.92 Barometric Pressure @ 70F
Fuel .699 Time 12.6 Holley 950 3 barrel, vacuum secondaries
4100 - 6700 RPM advanced ignition timing to 38 BTDC Headman Headers
RPM C TORQUE O TORQ C PWR O PWR BSFC C.F.
A DENS FUEL F TIME
BAND FT-LBS FT-LBS CHP BHP
#/HrHp STD 100% #/HR SEC
4100 425.6 416.6 332.3 325.5
0.457 1.0188 94.80 148.6 0.88
4600 447.7 438.3 392.1 383.8
0.46- 1.0187 94.80 175.5 0.47
5100 443.4 434.0 441.1 413.2
0.48- 1.0188 94.80 197.2 0.39
5600 423.4 414.5 451.5 442.0
0.48- 1.0186 94.80 213.5 0.43
6100 395.2 386.9 459.0 449.4
0.49- 1.0186 94.80 222.2 0.40
6500 367.3 359.6 454.5 445.4
0.54- 1.0186 94.80 240.8 0.45
AVRG 418.29 409.48 439.32 430.07 0.489
1.0187 94.80 210.71 7.79
RPM CFM AIR FLOW A/F Fuel Pr F PWR
OIL PR OIL T WAT T
BAND CFM #/HR RATIO PSI
FHP PSI DEG T DEG G
4101 453.8 1971.7 13.3 8.3
48.8 53.2 167.2 117.2
4600 534.7 2323.0 13.2 8.2
57.6 53.5 167.0 117.2
5100 573.2 2490.6 12.5 8.3
62.5 53.9 166.6 118.9
5600 643.3 2795.1 13.1 8.2
66.3 52.5 166.7 119.7
6200 713.8 3101.3 13.4 8.1
67.4 52.2 167.6 121.0
6600 708.2 3039,9 12.6 8.2
66.8 52.9 167.6 121.7
AVRG 635.96 2763.0 13.12 8.22
64.51 52.88 167.01 119.4
backup pull after idling for 5 minutes at 950 RPM
March 3, 2006 5:12 PM 85% efficiency 29.92 Barometric Pressure @ 70F
Fuel .699 Time 12.6 Holley 750/850 4 bl, mechanical secondaries
3000 - 6600 RPM ignition timing 38 BTDC Headman Headers
RPM C TORQUE O TORQ C PWR O PWR BSFC C.F.
A DENS FUEL F TIME
BAND FT-LBS FT-LBS CHP BHP
#/HrHp STD 100% #/HR SEC
4100 432.7 424.3 337.8 331.2
0.44- 1.0172 95.10 137.5 0.42
4600 443.8 435.3 388.7 381.2
0.44- 1.0171 95.10 167.9 0.52
5100 439.4 431.0 426.7 418.5
0.45- 1.0172 95.10 190.1 0.47
5600 420.3 412.5 448.5 439.0
0.47- 1.0172 95.10 205.1 0.43
6100 392.7 385.1 456.1 447.3
0.50- 1.0171 95.10 223.1 0.32
6500 363.3 352.8 452.8 443.4
0.54- 1.0172 94.80 232.4 0.30
AVRG 416.29 408.26 437.05 428.61 0.535
1.0171 95.10 203.48 7.83
RPM CFM AIR FLOW A/F Fuel Pr F PWR
OIL PR OIL T WAT T
BAND CFM #/HR RATIO PSI
FHP PSI DEG T DEG G
4100 439.8 1916.7 13.6 7.2
47.4 52.2 165.3 121.0
4600 515.6 2247.2 12.2 7.2
57.2 52.5 165.8 122.7
5100 582.2 2537.6 13.3 7.2
62.8 53.8 166.6 123.2
5600 634.1 2763.9 13.5 7.1
66.0 54.0 167.3 124.0
6100 686.8 2993.4 13.4 7.1
67.1 53.8 168.4 124.8
6600 695.9 3033.1 13.0 7.1
65.4 54.0 169.8 126.3
AVRG 623.95 2719.4 13.36 7.13
64.29 53.72 167.34 124.0
Below are the parts used and specs of the engine
REID'S AUTOMOTIVE INC PERFORMANCE SPECIALISTS
909 TEMPLE ST WHITMAN MA. 02382
TEL 781 857 2500 FAX 781 857 1203
www.reidsautomotive.com
- Disassemble and check specs
bore: 4.195 Stroke: 3.680 Deck .017
Pistons: 401 28CC dish
Crankshaft Casting 3196921 - 401
Rods: 68/69 390
Assemble for 10.2 compression, requires copper head gasket @.020
- REROUTE OIL FOR REAR BEARING OIL LINE
- REMOVE RINGS & BEARING CLEAN AND SAVE
- DISASSEMBLE HEADS CLEAN AND INSPECT, PORT AND POLISH PREVIOUSLY DONE
- CC HEADS CNE CHAMBER EACH HEAD - HEADS ARE 57.6/57.2 CC
- COMPETITION VALVE JOB INLINE V/8
SET SPRINGS CLOSED 160 LBS @ 1.830 OPEN 367 LBS @ . 1.981
- GRIND VALVES AND SEATS COMPETITION
- BLEND SEATS INT0 THROATS
- SACK CUT VALVES 30 DEGREES
- RESURFACE HEADS UP TO .020 [ACTUAL - .005 EACH ]
- CC HEADS AL_ CHAMBER [54 CC ] WITH NEW VALVES AND SEATS CUT
- R&R PISTON/SET NUMBER 0F PISTONS : 8
- R&R FREEZE PLUGS FROM CYLINDER HEADS
- INSTALL CAM BEARINGS AND FREEZE PLUGS
CHECK LIFTER BORES FOR OIL WITH ROLLER LIFTERS INSTALLED
- DEGREE CAMSHAFT [108.5 LC ]
- TRIAL ASSEMBLE CHECK V/- DECK HEIGHT COMPRESSION RATIO
ACTUAL COMPRESSION RATIO WITH .020 COPPER GASKET - 10.187:1
- MAKE SHIELD FOR PVC AND FIT AIRGAP 2 TO BLOCK AND HEADS
- MACHINE CAM THRUST SPACER AND SET CAM WALK
- OVERHAUL CARB AND INSTALL POWER VALVE PROTECTOR 4779 HOLLEY
- OVERHAUL CARB AND INSTALL POWER VALVE PROTECTOR 0-4604 HOLLEY
6.604-S 3 BL CARB SAVE GASKET TO MATCH
- BRIDGEPORT MILLING MAKE MACHINE MOUNT PLATE FOR DYNO
- SETUP ENGINE FOR DUEL OIL LINE SYSTEM
- INSTALL MILODON 8 QUART PAN WITH SWING ARM PICKUP AND DUAL EXTERNAL OIL
LINE
PARTS:
MAP 11892 INTAKE VALVES - 8
MAP 11859 EXHAUST VALVES - 8
CMP 10-00-9 A8 AMC V-8 ROLLER CAM 4975F/4876F-R110
CMP 848-16 ROLLER LIFTER
CMP 985-16 948-973
CMP 740-16 1.437" RETAINER
CLE SH671S CAM BEARINGS
CMP 616-16 #.050 3/8 SUPER LOCK
VSA C306 SPRING SHIM
VSA B306 SPRING SHIM
ENG S9250 3/8X530 SEAL
F/P KS2001 GASKET SET
F/P MS96011 VALLEY TRAY
MEL K-85 OIL PUMP ADAPTER
MEL 85-S PICK UP SCREEN
ELG PR537 PUSHRODS - 16
MSD 8519 AMC PRO BILLET DISTRIBUTOR
MSD 6AL IGNITION CONTROL BOX WITH ADJUSTABLE REV LIMITER
MSD BLASTER 2 COIL
MSD 8006 BRONZE GEAR
AMC 291C PORTED AND POLISHED HEADS BOUGHT FROM EBAY
EDL 7531 EDLEBROCK PERFORMER RPM AIRGAP MANIFOLD
CENTER FORCE II STREET AND STRIP CLUTCH, PRESSURE PLATE AND THROW OUT
BEARING
CAM SPECS:
SPECS: GRIND # 4875F/4876F R 110.0
VALUE ADJUSTMENT: INTAKE - .016 EXHAUST -
.018
GROSS VALVE LIFT: .577
.583
DURATION @ 0.15 TAPPET LIFT: 285 291
VALVE TIMING @ .050 OPEN 14 BTDC 57
BBDC
CLOSE 54 ABDC
17 ATDC
FOR CAM INSTALLED @ 110.0 INTAKE CENTER LINE
DURATION @ .050 248
254
LOBE LIFT .3850
.3890
LOBE SEPARATION 110.0
Regards,
Dan Curtis
d.curtis@xxxxxxx
602-317-2018
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