FE Power Forums
FE Power Forums => FE Technical Forum => FE Engine Dyno Results => Topic started by: My427stang on March 18, 2023, 10:53:10 AM
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Performance Summary:
Cubic Inches: 465 Dyno brand: Land and Sea Dynomite
Power Adder: Where dynoed: Willard Auto Machine, Omaha, NE
Peak Horsepower: 477 @ 5500 (471 @ 5950)
Peak Torque: 524 @ 4000
Engine Specifications:
Block brand, material, finished bore size, other notes: Factory 428 C scratch 4.175
Crankshaft brand, cast or forged, stroke, journal size: Cast SCAT 4.25
Connecting Rods brand, material, center to center distance, end sizes, bolts: SCAT I-beam 6.70
Piston brand, material (caster, hypereutectic or forged), dish/dome volume, static CR: Racetec, 4032 Forged, -22 cc, 10:2
Main Bearings, Rod Bearings, Cam Bearings brand and size: Clevite rod and main bearings, Durabond cam bearings
Piston rings brand, size, other notes: Mahle 1mm / 2mm standard tension
Oil Pump, pickup, and drive: Melling M57HV, Milodon pickup, Melling HP drive
Oil pan, windage tray, oil filter adapter: Milodon 31130, factory oil filter adapter
Camshaft brand, type (hyd/solid, flat tappet or roller), lift and duration (adv and @.050"): Custom Bullocks hyd roller, 235 intake duration / 242 exhaust duration, 114 LSA on 107
Lifters brand, type: Morel standard travel
Timing chain and timing cover: Cloyes 9 position, factory timing cover
Cylinder heads brand, material, port and chamber information: Factory CJ C8OE-N, unported
Valve springs brand, part number, specs: 977-16 Comp 155 closed, 405 open
Rocker arm brand, type (adjustable or non-adj), material, ratio: Harland Sharp Adjustable
Rocker shafts and stands, brand, material: Harland Sharp shafts, Precision Oil Pump stands
Pushrods brand, type, length: Smith Brothers, 3/8 cup, 5/16 ball, non oiling .080 wall , length, 8.400
Valve covers, brand, type: 1970 CJ - baffles removed by owner
Distributor brand, advance curve information: Pertronix 2 billet
Harmonic balancer brand: Factory CJ rebuild
Water pump brand, type (mechanical or electric): Tuff Stuff iron - electric powered on dyno
Intake manifold brand, material, porting information: Blue Thunder CJ - unported
Carburetor(s) brand, type: DOZF-AB CJ Automatic, stock jetting, no spacer, gasket only
Exhaust manifolds or headers brand, type: Dyno headers, 1 7/8 truck, 3 inch collector
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This was an interesting one, lots of variables changed from my normal routine, some not changed
Most important was the new dyno, I did this one locally because we had to deliver quickly. It's very hard to compare one dyno to another, but it came up with a realistic number, although I think a little stingy, need to do another on it to see how to compare. What I was not fond of was the correction factor, no excuses, but we went from a sunny day to snow squalls and dropping atmospheric pressure but the dyno didn't change it's correction. Regardless, the numbers are what the machine told us, and with approx a 250 cfm head, it's using it all
This one was a set of iron heads with 11/32 valves, no porting, early BT CJ intake, also no porting, no spacers because of it being a shaker car, and a bone stock 70 CJ carb, even jetting was stock although I am running a 7.5 PV. Turned out pretty nice, a/f was rock solid at 12.5/12.7 through the pull, although we did use all of that carb, it made lots of idle vacuum with 114 LSA and carried the HP within 4 hp from 5500 peak to 6000, torque was above 500 ft lbs from 3300-4500
This is going in a A/C C-6 PB street Mach, so it will be a monster compared to it's broken 428. However, like the old "stone soup story"...some head, more overlap, some spacer, modern carb, etc
Regardless, neat to see that a set of unported heads and intake with a 735 and a mild mannered vacuum and idle requirement can make 100+ HP over a decent running CJ
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That's a nice engine, Ross. Excellent street engine as it makes all its power by 5500. That Mustang's gonna rip. :)
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Very nice job Ross, by the way where did you find a set of 1 7/8 truck headers? Been looking for some for mine
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Wish I knew what they were, swap meet specials
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Any dimensions on the header lengths?
Or cam lift?
Good to see the old heads get the job done, then again all those SuperStock wins came from somewhere.
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I haven't been up there in a while, but they were Ford truck headers, not sure on length. Long tube, nothing fancy
Cam lift was .588