Dual Plane Intake?

crazycanuck

buddy gave me desktop dyno 2000....anyone know how much the heads flow?what about the edelbrock ones? ive been able to find everthin else thx barring the fact that i do not know the actual head flow numbers i have been able to produce an amc 360 that produces 400ft/lbs of torque from 2000-6000rmp using a dual plan manifold and 9.8:1 comp ratio? could this work? it would be my (and im sure many others here) dream motor. my question is, is there a good dual plane intake for the AMC V8 and what would need to be done for this motor to survive at thes power levels?

SwampRat

Cylinder Head Database AMC Heads Edelbrock Performer RPM AMC/Jeep 2.02/1.60 54cc chamber Dog Leg exhaust ports Aluminum PN 60119 Lift - Intake -Exhaust (no pipe) 0.050 - 30 - 23.5 0.100 - 62 - 49 0.200 - 130 - 95 0.300 - 190 - 118 0.400 - 232 - 145 0.500 - 252 - 162 0.600 -252 - 165 0.700 -259 - 176 (0.650) Tested with a 4.150 bore to approximate a 0.060-over AMC 360 ci engine (4.140). The bore size for a 401 ci engine (4.165) will have more flow throughout the curve with a distinct improvement over 0.500 lift. I'd say 400 Hp on a dual plane "street" 360 is generous, but doable. But remember it's not about the most power you can build but the best combination you can build. Those types of programs will just keep accepting camshaft and carburetor and peak power will climb until the program's brain has told it that it maxxed out the rest of the combination. So it's best to just explain your situation to a experienced AMC'er and see his opinion as well.

MrFurious

Don't rely on Desktop Dyno for numbers as it's pretty far off base. Numbers we got from it on a recent Mopar 408 stroker build were way low (405HP/470TQ), but once we got it built and put it on a real dyno we were happily surprized with 453HP @ 500rpm and 507ft-lbs @ 4000 (with over 450ft-lbs from 2000-6500rpm). On the other hand, I know a few people who have had just the opposite exerience where DD gave them higher numbers than what were achieved on a real dyno.

My recommendation is to use the DD software only to compare cams. First your basic engine specs entered (bore, stroke, heads, intake, carb, etc.), then plug in different cams making no other changes. Note the increase/drop in HP and TQ numbers across the board, and also where those numbers are peaking (rpm). While one cam may give you an additional peak 15-20ft-lbs or HP, you'll also usually notice a significant drop in low end torque. This will help you pick the cam that will potentially make the best power in the RPM range you're looking for.

Of course, you also have to remember that the software assumes everything else is perfect in regard to engine tuning.

Here's a setup I just threw together for shits & giggles:

Bore: 4.11"
Stroke: 3.45"
Heads: Edelbrock Performer RPM (the flow numbers I got on these vary slightly from those posted above, but every flowbench will vary slightly)
Valves: 2.02/1.60
CR: 10.5:1
Carb: 670cfm @ 1.5 inHg
Intake: Dual Plane Std-Flow
Exhaust: Large tube headers w/mufflers
Cam: Summit 8600
Cam Installed Timing: 0

Here's the exact same setup with the Summit 8601 cam. One would think it would make more power due to the increased duration and lift, but as you can see that simply isn't the case. Both peak HP and TQ are down compared to the 8600 clear across the board.

Mudrat

Thanks Jim - my numbers were a litle different with DD too, showing right about 400HP for pretty much the same set up (360, 30 over, balanced, performer intake, mild smoothing - but not port matched, 8600 cam, 3* valves, and the 1405 carb). The shops dyno program puts the motor at about 425HP and almost 470 TQ for the same specs. But at least I know I'm ball park :t: