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Old 03-19-2006, 11:40 AM
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408 desktop dyno

Can anybody tell me what this will do now that I finally got some flow numbers at .600 lift? It is a 400 bored .040 to 408 with calculated compression of 10.76:1, Summit Engine Shop Sportsman heads with 2.05/1.6 valves flowing 268cfm intake and 188cfm exhaust at .600 lift (only numbers that could find), Comp XR282 hydraulic roller with following specs at .050 lift: 230 duration on intake and 236 duration on exhaust with 110 lobe separation installed at 106.2 intake centerline.

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Int: 9 BTDC 41 ABDC
Exh: 52 BBDC 4 ATDC

It has 1.6 rockers for corrected valve lift at .544" intake and .550" exhaust. For induction, it runs the Dart Kool Kan (air-gap hi-rise dual-plane) and a 750 Speed Demon carb. It has a DUI Hei with 12 degrees initial with additional 15 degrees from vacuum advance on full manifold vacuum and 22 degrees mechanical all in at 3000rpm. For exhaust, it has 1 5/8 headers into 3" exhaust. I have been guessing 490hp and just curious what a computer software says.

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Old 03-19-2006, 01:24 PM
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EA3.2 sees it like this:

RPM···········1500····2000····2500····3000····3500 ····4000····4500····5000····5500····6000
Brake_Tq······283·····347·····397·····448·····471· ····477·····460·····428·····395·····341
Brake_HP······80.7····132·····189·····256·····314· ····364·····394·····408·····413·····390
Exh_Pres······.1······.1······.2······.4······.6·· ····.8······1.0·····1.2·····1.4·····1.6
Int_Vacuum····0.0·····.1······.2······.3······.5·· ····.7······.8······1.0·····1.2·····1.3
Vol_Eff_%·····66.8····72.1····78.2····86.8····92.2 ····95.6····96.0····94.5····92.9····89.2
Actual_CFM····128·····183·····249·····331·····411· ····487·····550·····602·····650·····682
Fuel_Flow·····46.6····67.0····90.9····121·····150· ····178·····201·····220·····238·····249
A/F_Mix_Qal···79.9····96.3····100.0···100.0···100.0· ··100.0···100.0···100.0···100.0···100.0
BSFC··········.578····.508····.481····.473····.478 ····.489····.510····.539····.575····.638
BSAC··········7.245···6.369···6.033···5.939···5.99 3···6.139···6.396···6.761···7.211···8.009
Friction_HP···14······24······35······48······64·· ····84······109·····137·····172·····211
Mach_#········.131····.175····.219····.262····.306 ····.350····.393····.437····.481····.525
Piston_Spd····938·····1250····1563····1875····2188 ····2500····2813····3125····3438····3750
Piston_Gs·····160·····285·····445·····641·····872· ····1139····1442····1780····2154····2564
Overlap_%VE···-4.4····-3.9····-2.5····.9······1.7·····2.0·····1.0·····-.7·····-1.2····-1.4
Int_AvgVel····91······121·····151·····181·····211· ····241·····272·····302·····332·····362
In_InertiaPrs·.0······.2······.8······1.4·····2.0· ····2.4·····2.6·····2.7·····2.5·····2.3
In_ResTunPrs··0.0·····0.0·····0.0·····0.0·····0.0· ····0.0·····0.0·····0.0·····0.0·····0.0
Ex_AvgVel·····116·····154·····193·····232·····270· ····309·····347·····386·····425·····463
ExTun_Prs·····.7······.9······.4······-.6·····-.9·····-1.3····-1.5····-1.4····-1.1····-.8
Lifter_Pump_UpNone····None····None····None····None ····None····None····None····None····Some
Spark_Adv·····24······26······28······28······30·· ····31······32······33······34······35
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Old 03-21-2006, 05:20 PM
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Does brake horsepower and torque mean through the driveline? Also forgot that it has 6" rods which will lower the piston speed by a little. It also has Speed Pro 1/16"/1/16"/3/16" rings for lower friction. Not familar with EA3.2 but it looks like a decent program.
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Old 03-21-2006, 05:47 PM
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Brake horsepower and torque are at the flywheel. Since you didn't specify the pistons, rods or rings I put them in as stock. I assumed 200cc intake runners, but the flow may be off due to the lack of data points. I also assumed that you are running some accessories like a water pump and a fan. You were also less than technical about the configuration of your exhaust system and oiling system.
Note the rows labeled Overlap%VE and ExTunPrs. This predicts the effect of the overlap on the VE and you want to have positive numbers here. ExTunPrs predicts the pressure at the exhaust port, so you want a big negative number here. FrictionHp calculates the loss due to friction, and you want small numbers there by using low friction rings and bearings, low windage oiling system, fewer accessories, etc.

Last edited by onovakind67; 03-21-2006 at 06:00 PM.
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Old 03-21-2006, 07:43 PM
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Thanks for the reply. Can you try this then.? It has a Scat Series 9000 knife-edged crankshaft, Scat 4340 steel 6" i-beam rods, KB 2-valve (KB128) 7cc 4.165" flattops with Speed Pro 1/16"/1/16"/3/16" low-drag piston rings. It is internally balanced with a TCI Rattler 7 1/4" balancer and a B&M flexplate. I can't find the balancing sheet that listed each item gram weight. It runs standard Clevite P bearings and Fel-Pro 1014 head gaskets (4.2" bore .039" thickness). The block deck height has been milled to 9.01 along with being lifter-trued and align-bored. The heads are old World Sportsman II heads that were prepared by the Summit Engine Shop around 10 years ago. They are around 205cc intake runners, 69cc combustion chambers with 2.05/1.6 valves. They are port matched to a Felpro 1205 intake and a 1404 exhaust gasket. The intake is a Dart Kool Kan (port-matched to a 1205 gasket by Flowdesign). The heads flow right at 268cfm intake and 188cfm at .600 lift (got from Summit Racing from one of their old engine shop guys who happened to have the information). The camshaft is a XR282 hydraulic roller with the specs at .050: 230 duration intake and 236 duration exhaust. It is degreed at 106.2 intake centerline with a lobe seperation of 110. The camshaft lobe lift is .340" intake and .347" exhaust and uses Crane 1.6 Gold Race roller rockers on both the intake and exhaust. It uses a roller thrust button and a Cloyes True Roller timing chain. It runs a Carter mechanical fuel pump (120gph 7-8.5psi). The carb is a BG 750VE Speed Demon with bigger 78/85 jets that was set up with a thermal gun by a much experienced Pro-Gas racer with a K&N 14x5 air cleaner. The idle screws are set with a vacuum gauge getting 15.1 inches at 900rpm. Between the carb and intake is a phenolic 1/2" open spacer. The oiling system is a Melling standard volume oil pump with a Moroso 7-quart baffled kick-out oil pan with a Milodon oil pump baffle plate. It runs a standard water pump with 1986 k-10 pulleys that run an 80-amp alternator via serpentine and a hydro-boost power steering pump via v-belt. Both valve covers are baffled and run Moroso open breathers. The cooling is done by a dual electric fans behind a ex-diesel radiator fed by a 160-degree thermostat. The headers are Flowtech Afterburner headers (port-matched to a 1404 gasket and TIG-welded back together for the amount of material removed). The headers flow into a dual 3" exhaust that go to Flowmaster Delta-flow 40-series mufflers that exit right at the rear axle with a total of 3 30-degree bends in each pipe. The distributor is a Davis Unified HEI set up for 12 degrees initial, additional 15 degrees from the vacuum advance at idle from full manifold vacuum . The mechanical advance is set up for 22 degrees in at 3000rpm. Hope this is the information you was looking for. Thanks
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Old 03-22-2006, 06:38 AM
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This should get you aboput 350 rwhp.

RPM···········1500····2000····2500····3000····3500 ····4000····4500····5000····5500····6000
Brake_Tq······277·····343·····408·····465·····476· ····480·····471·····446·····415·····373
Brake_HP······79.1····131·····194·····265·····317· ····366·····403·····424·····435·····426
Exh_Pres······0.0·····.1······.2······.3······.5·· ····.7······.8······1.0·····1.2·····1.3
Int_Vacuum····0.0·····.1······.2······.3······.5·· ····.6······.8······1.0·····1.2·····1.3
Vol_Eff_%·····64.6····71.3····79.4····89.0····92.2 ····94.8····95.4····94.4····92.9····89.9
Actual_CFM····123·····182·····253·····342·····412· ····482·····546·····601·····650·····687
Fuel_Flow·····45.1····66.4····92.4····125·····150· ····176·····200·····219·····238·····251
A/F_Mix_Qal···84.8····97.0····100.0···100.0···100.0· ··100.0···100.0···100.0···100.0···100.0
BSFC··········.570····.507····.476····.472····.474 ····.482····.495····.517····.546····.589
BSAC··········7.146···6.365···5.972···5.915···5.94 9···6.047···6.212···6.488···6.852···7.387
Friction_HP···13······21······31······42······56·· ····73······95······120·····151·····186
Mach_#········.131····.174····.218····.261····.305 ····.348····.392····.435····.479····.523
Piston_Spd····938·····1250····1563····1875····2188 ····2500····2813····3125····3438····3750
Piston_Gs·····157·····280·····437·····629·····856· ····1119····1416····1748····2115····2517
Overlap_%VE···-5.6····-3.9····-.8·····3.7·····2.5·····1.7·····.8······-.5·····-1.0····-1.2
Int_AvgVel····89······119·····149·····179·····209· ····239·····268·····298·····328·····358
In_InertiaPrs·.0······.2······.7······1.3·····1.9· ····2.4·····2.6·····2.7·····2.5·····2.3
In_ResTunPrs··0.0·····0.0·····0.0·····0.0·····0.0· ····0.0·····0.0·····0.0·····0.0·····0.0
Ex_AvgVel·····116·····154·····193·····232·····270· ····309·····347·····386·····425·····463
ExTun_Prs·····1.2·····.9······-.2·····-1.1····-1.0····-1.1····-1.3····-1.3····-1.1····-.8
Lifter_Pump_UpNone····None····None····None····None ····None····None····None····None····None
Spark_Adv·····18······19······19······19······22·· ····25······30······33······34······35
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