Would it be possible for anyone out there to run a desktop dyno program on the following paramaters. I know it's not a buick (it's for my brother in law). It's his new big block Chevy he's having built for his pulling truck (extremely redneck, but pretty fun). If anyone could run the numbers for this combo it would be greatly appreciated. Here's the info I have: bore:4.312 stroke:4.250 rod length:6.535 +.400 cam: intake.671 274*@.050 exhaust.642 282*@.050 lobe center 110+4 intake: high rise single plane team G carb: 1100cfm headers:big tube/open compression: 13.8 to 1 heads:iron eagles 345cc milled to 115 comb chamber for more compression I went to the web site and got this chart hope the flow number help Dan, Material: Superior cast iron alloy Comb Chambers: 119cc Intake Valve Dia: (308) 2.250 (345) 2.300 Intake Port Dim: (308) 2.380 x 1.770 (345) 2.470 x 1.770 w Int Port Location: Stock Intake Gasket: Mr Gasket# 121 Exh Valve Dia.: 1.880 Exh Port volume: 129cc Exhaust Port Dim: 1.670 x 1.800 w Exh Port Location: Raised .300 Std bolt pattern Exhaust Gasket: Fel-Pro 1412 Exhaust Bolts: 1 longer than stock (4) ea. Flow, Intake: (308) 363 cfm (345) 390 cfm @.800 lift/28 Flow, Exhaust: 266 cfm @.800 lift/28 (Our valves, +10/15 cfm better) Manifold: Rect. Port Dart (opening - 1.575x 2.250) 6.25 tall Milling: Min. 110cc. (.005 = 1cc) Flat mill only. Pistons: Most aftermarket pistons. Push Rod length: Avg. +.200 / +.250 Should always measure Stock length Int. = 8.275 / Exh = 9.250 Retainers: 1.625 - Tit / 1.550 - Moly Steel (10) Spark Plug: .750 reach, gasketed. Champion C59C / C59YC Street RC12YC Spring Cups: 1.625 - .035 cup / 1.550 - ID locator Spring Pockets: 1.740 OD for 1.625 cup (no deeper) Springs: Our Assembly: 1.550S = 145# @1.900 / .660 max Comp 936 1.550D = 195# @ 1.900 / .690 max Comp 954 1.625D = 250# @ 2.000 / .790 max Vasco-Jet H-11 Stud Girdle: Must use DART design. Part# 64110001 Valve Angles: Int - 24, Exh - 15 (Rolled 2) 4 cant Valve Length: Int - 5.475 (+.250) Exh - 5.435 (stock) Valve Stem Dia: .3415 - 11/32 Valve Train: Std BBC 7/16 stud mount Valve Guides: 1/2 OD Mag - bronze Cut for .530 PC seals (.002 press) Valve Guide length: Int - 2.100 Exh - 2.250 Valve Guide clearance: .0014 - .0021 (with our .3415 dia. valve stem) Valve Guide Spacing: Exh moved .045 away from Int Valve Seats: Exh = Tungsten hardened alloy, .006 press (TIR .004) Valve Seat dim. Exh - 2.000 x 1.600 x .375 Valve Seat angles: Int = 32 - 45 - 60 - 70 Exh = 37 - 45 - radius Valve Covers: Part# 68000020 Torque: Head Bolts = 70 ft/lb; Rocker Studs = 45 ft/lb; Manifold = 35 ft/lb Block Use: Mark IV, Gen V, Gen VI with proper head gasket Weight: 70 lbs Thanks a lot, Brett Schmahl
Hi, I ran the engine through. Here's what I got: 639 HP at 6000 rpm 634 TQ at 4500 rpm Sounds like a healthy engine. Good luck to him. Phil
Just out of curiosity, what software were you using? When it gives you the data back, does it give estimates at different power levels, or does it just give you peak numbers? I'm not real familar with any of the software, and was kind of curious how it works. From what I have read, the accuracy seems to be pretty good on the majority of the programs. Thanks, Brett Schmahl
It's DeskTop Dyno 2000. If I were more computer literate I'd learn how to attach a file and post it here. Sorry. It gave power numbers from 2000-10,000 rpm. Nice bell curve for both HP and TQ peaking at the numbers I said earlier.
Phil, Thanks for the help. I sure wish I could see those graphs. I do appreciate you taking your time to run a simulation. Does anyone else know how attach the graphs to this thread? Is anyone else running a different program? What do you get? Brett
I use a screen capture program and attach them as JPEGs. If Phil sends me the files, I can capture and post them.
