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Old 04-11-2006, 11:15 PM
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HP estimate? 355 chevy...

I know I should get my own, but can someone with desktop dyno run this for me? It's a 350, .030 over, Performer RPM heads(64cc), Performer RPM air gap intake, comp cams XE284H 240/246 @.050, .507/.510 on 110*, 10.25:1. Full length headers, 750 Q-jet. I'm not sure what else DD needs, but ask and I will provide it. Thanks!!

Freak

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Old 04-12-2006, 03:17 AM
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Bore, stroke, rod length, piston type, ring type, bearing type
any accessories like water pump, fan, power steering, etc
oil pan configuration, windage tray? crankcase vacuum pump? wet sump?
Head type, specifications, modifications, flow numbers if possible, valve sizes, compression ratio
Intake type, modifications, runner length if possible, carb type and cfm
Exhaust system configuration and dimensions
Primary tube size and length, collector size and length, crossover? X-pipe?
Muffler cfm and size
Cam and lifter type, advertised duration, duration @.050”, lobe lift, intake lobe installed centerline, lobe separation angle, rocker arm type and ratio
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Old 04-12-2006, 01:13 PM
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Bore: 4.030"
Stroke: 3.48"
Rod length: 5.7"
Intake: Edelbrock Perf RPM airgap
Heads: Edelbrock Perf RPM Aluminium 2.02/1.60 64cc, out of the box
Carb: 750 Q-jet
Exhaust: 1 5/8" primary, 3" collector, 2 1/2" Xpipe with Flowmaster 40's
Rockers: Roller tip, 1.5:1
Cam: Comp Cam XE284H(p/n 12-250-3) Adv. 284/296, .050 240/246, .507/.510 valve lift, 110* seperation
oil pan: stock truck pan, no windage tray
Pistons: Flat top, -5cc valve relief, hypereutectic, gapless moly faced rings
Bearings: clevite 77

TIA, Freak
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Old 04-12-2006, 01:25 PM
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a 350 @ .030 over is a 355... I'm not on my computer at home (has Dyno 2000) but it sounds like a good combination. For street driving torque is a lot more useful and fun than a lot of high end power. By looking at your cam duration numbers it seems to be more for high end, but what do I know, I'm 20 and rebuilt a 350 GM diesel and put a briggs and stratton on giggle juice (nitrous). So that's not a lot of cred for me.
-matthew
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Old 04-12-2006, 01:33 PM
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Quote:
Originally Posted by ChevelleSS_LS6
a 350 @ .030 over is a 355... I'm not on my computer at home (has Dyno 2000) but it sounds like a good combination. For street driving torque is a lot more useful and fun than a lot of high end power. By looking at your cam duration numbers it seems to be more for high end,
Yeah, I already know this, but I'm building this engine for a relative (could be a nightmare) and he would like a ball park HP #. I'm guessing around 420, but I could be off by a midge or a mile. This isn't a concrete combo, I may play around with cams and rocker ratios a bit to match it to the truck, depending on HP/TQ #'s I may run the XE274H with slightly less duration, we'll have to see.
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Old 04-12-2006, 01:54 PM
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I think you will see a solid 400hp and 375-400 max torque.

Adam
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Old 04-12-2006, 06:52 PM
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RPM···········2000····2500····3000····3500····4000 ····4500····5000····5500····6000····6500
Brake_Tq······267·····299·····339·····360·····372· ····402·····392·····370·····325·····280
Brake_HP······102·····142·····194·····240·····283· ····344·····373·····388·····372·····347
Exh_Pres······.1······.1······.2······.3······.4·· ····.7······.8······1.0·····1.0·····1.1
Int_Vacuum····.3······.5······.6······.6······.6·· ····.6······.8······1.0·····1.1·····1.1
Vol_Eff_%·····66.4····72.0····79.3····84.9····89.2 ····96.3····97.4····96.8····92.7····89.0
Actual_CFM····147·····199·····263·····329·····395· ····480·····540·····589·····615·····640
Fuel_Flow·····53.7····72.7····96.1····120·····144· ····175·····197·····215·····225·····234
A/F_Mix_Qal···100.0···100.0···100.0···100.0···100.0· ··100.0···100.0···100.0···100.0···100.0
BSFC··········.527····.511····.496····.501····.510 ····.510····.529····.555····.605····.674
BSAC··········6.614···6.412···6.225···6.288···6.39 5···6.396···6.634···6.965···7.592···8.457
Friction_HP···19······29······40······53······68·· ····88······112·····140·····172·····212
Mach_#········.169····.211····.253····.295····.337 ····.379····.421····.464····.506····.548
Piston_Spd····1160····1450····1740····2030····2320 ····2610····2900····3190····3480····3770
Piston_Gs·····258·····403·····581·····790·····1032 ····1306····1613····1952····2323····2726
Overlap_%VE···-5.4····-4.2····-2.1····-1.4····-1.2····2.5·····2.6·····2.3·····-.5·····-1.1
Int_AvgVel····115·····144·····173·····202·····230· ····259·····288·····317·····346·····374
In_InertiaPrs·.2······.6······1.2·····1.8·····2.2· ····2.5·····2.6·····2.5·····2.3·····2.1
In_ResTunPrs··0.0·····0.0·····.0······.0······.0·· ····0.0·····0.0·····0.0·····0.0·····0.0
Ex_AvgVel·····115·····144·····173·····202·····231· ····259·····288·····317·····346·····375
ExTun_Prs·····.8······.6······-.1·····-.4·····-.5·····-1.2····-1.6····-1.7····-1.4····-1.2
Lifter_Pump_UpNone····None····None····None····None ····None····None····None····None····None
Spark_Adv·····27······29······30······30······31·· ····32······33······33······34······35
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Old 04-12-2006, 07:08 PM
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I had similar but lower numbers of 365hp @ 6000 and 364lb-ft @ 4500
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Old 04-12-2006, 07:17 PM
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onovakind, I see you get around! good seein you here!
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Old 04-12-2006, 07:42 PM
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Originally Posted by ztoy
onovakind, I see you get around! good seein you here!
Yep, I've got more time than money....
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Old 04-13-2006, 11:35 AM
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Thanks for all the posts, guys! I appreciate the time you spent. I'm looking for desktop dyno, but having a bit of troublr locating a distributor in my area. Looks like a road trip may be in order, . Looks like I have a bit of playing to do, I want to see about 425hp & 400 ft/lbs. As the truck will see only occasional highway miles, I may switch to a Holley or BG and see if the #'s come up. I have been bouncing the idea of 1.6 rockers around, thinking it may boost the #'s up slightly. What do you think? The new lift #'s would be 540/544.

Last edited by sbchevfreak; 04-13-2006 at 11:46 AM. Reason: additional info
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Old 04-13-2006, 01:11 PM
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Rather than DD you may want to look at Engine Analyser. Seems more comprehensive to me (just one man's opinion). About the same price, and yo can download it as a sample, then call the company and they give you a passcode to make it live! For whatever it's worth, I think that's what onovakind is using.

Just guessing, but I think the increased rocker ratio will help. Also think about AFR195s (vs Edelbrock) and a slightly milder cam.

Pat
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Old 04-13-2006, 01:38 PM
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I agree with the AFR's if you have the money, but I would think about the 180's (the edelbrocks are 170cc). Here is a combonation to consider with a cam much milder than the one you are looking at (224 @.050), it is a roller though.

http://airflowresearch.com/articles/article40/A-P1.htm


Adam
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Old 04-18-2006, 01:15 PM
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Hi, guys. Sorry about the delay, but I haven't been able to get online lately. The guy I am building this for wants to try keep the price around 4000-4500 for this engine, so that kinda cancels the AFR heads, as where I am they run about $2000. I ordered my own dyno program, so I won't pester you guys for that stuff too much. I appreciate the replys, and will run a few simulations and let you know what I come up with.

Thanks,
Freak
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Old 04-18-2006, 01:28 PM
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I thought AFR heads were in the $1400 range mail order. Maybe thats $2000 Canadian. If that's the case, with a budget of $4000-$4500 Canadian, you might have to skip the Edelbrocks as well. You might run some simulations with your dyno using Vortecs. They work really well up to about .450 or .500 lift, then flatten out. Flattening out is NOT a bad thing, it's a lot like having a long duration at max flow (like you get with an agressive roller cam). If you check Scoggin-Dickey (sp??) they do have them with upgraded springs and a mild pocket port, as I recall, for about the regular price. Let us know what you decide.

Pat
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