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Author
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Topic: anybody have desk top dyno?
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dhearn
Gearhead Posts: 227
From: Owenton Ky,USA
Registered: Nov 2000
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posted 03-30-2002 05:19 AM
   
If sombudy has desktop dyno could you punch some numbers for me? my sweet wifey just bought me a set of edelbrock performer alum heads for my car and I would like to know what the best intake manifold would be.
351w bore 4.030
comp cams 280h
holley 670 cfm vacuum sec.
full tube headers
edelbrock heads 60cc chambers 2.02 1.60
Thanks
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1969 MACH 1 (with no miss)
THE FEEL AND SOUND OF A FORD V-8 IS ALL THE DRUGS A MAN NEEDS
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V8 Thumper
Gearhead Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 03-30-2002 07:04 AM
Wow!!! She's a keeper  I've got Desktop Dyno, but it's only a volumetric efficency calculator; it makes a fair number of asumptions based on pre-
programmed values such as manifolds.
'Single plane', 'dual plane', 'tunnelram' etc. are the choices you're given. Cylinder heads can be entered with specific flow rates, cam profiles can be entered and calculated, but intake manifolds and headers they've got generalized. I'd pick a manifold based on what you intend to do with the car and how it's all set up. You might wind up needing more carb, too. Them shiny heads move some atmosphere  For what it's worth, I ran your numbers anyway. A single plane made 433 hp@6000/ 422 torque@4500... a dual plane made 402hp and 408 torque. Here's the discrepency- you and I know that not all manifolds are created equal. I entered 'dual plane'... stock cast iron or RPM AirGap??? The software can't account for it. Makes a big difference, see what I mean?
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V8 Thumper
Gearhead Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 03-30-2002 07:15 AM
One more thing... I know that 2.02 Edelbrocks on 289/302's DO require piston fly-cutting... I'd think the same holds true for 351's. Maybe worth looking into...
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richard bohm
Gearhead Posts: 373
From: tucson,az-luray,va
Registered: May 2001
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posted 03-31-2002 01:37 AM
you will need to do a little triming on the 351W piston for 2.02 intake clearance. desk top dyno isnt really for calculating actual hp. it is more like a starting point and also used to compare parts. it is however fairly accurate in its calculations. as for your carb, i too would recomend a larger one. something like a 750 would do nicely.
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bluestreek
Gearhead Posts: 1332
From: Athens,GA
Registered: Jul 2001
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posted 03-31-2002 10:19 AM
Could someone run these numbers for me? It's in the shop being balanced as we speak.  331 cu in 3.25 stroke x 4.030 bore
9.6:1 compression
230/236/110 solid roller cam .560/.580 lift
Trick flow heads w/60cc, 2.05/1.60 vlv 260/200 cfm
Air Gap or Xcellerator single plane (have both)
1 3/4 headers and dual Flowmasters
750 Holley HP thanks, BS
[This message has been edited by bluestreek (edited 03-31-2002).]
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richard bohm
Gearhead Posts: 373
From: tucson,az-luray,va
Registered: May 2001
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posted 03-31-2002 12:21 PM
bluestreak, for yours i get 348hp @5000 rpm and 416 lb/ft @3500 rpm. it makes for a great street motor. the low end and midrange torque curve is high and flat. good choice for the street.
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bluestreek
Gearhead Posts: 1332
From: Athens,GA
Registered: Jul 2001
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posted 03-31-2002 12:25 PM
The torque of a strong 351 and the weight of a 6 cyl!! That's the plan. The camshaft figures are for .050 lift by the way, and I think 348 HP should be no problem for a full roller setup.  Thanks [This message has been edited by bluestreek (edited 03-31-2002).]
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richard bohm
Gearhead Posts: 373
From: tucson,az-luray,va
Registered: May 2001
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posted 03-31-2002 10:23 PM
bluestreek, i am somewhat embarrased. i didnt tell the program the duration numbers were .050 numbers. i made the change and got hp 478 @ 6000 rpm
tq 455 @ 5000 rpm.
the torque curve starts at 361 lb/ft at 2000 and essentially ends at 380 lb/ft at 6500.
still a great street motor. remember these numbers are +/- 10%, so dont take them as gospel.
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67coupe
Gearhead Posts: 405
From: dallas NC usa
Registered: Nov 2000
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posted 04-01-2002 12:48 AM
was wondering if anybodywould mind running mine through it is a 351c 40 over with 1 3/4 long tubes torker351 intake stock closed chamber 4bbl heads bout 10.2-1 comp 585 lift 252 dur at .50 110 lobe sep750dp holley thanks everyone ------------------
Josh
67 coupe with 351c
94 Explorer
30 model A currently rustbucket
in process 67 convt with efi 5.0 and t5
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richard bohm
Gearhead Posts: 373
From: tucson,az-luray,va
Registered: May 2001
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posted 04-01-2002 11:37 AM
josh, this is an decent bracket race motor. i wouldnt use it on the street as you would get more torque at 2000 rpm by spinning a wagon wheel(lol)
peak hp 458 @ 7000 rpm
peak tq 382 @ 6000 rpm
i would launch at 4000-4500 rpm, that is where you atart getting good torque. i would shift at 7500 rpm as that is just past the hp peak. you might try an 8000 rpm shift point to see if et improves but i think 7500 will be best.
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Jerry Piner
Gearhead Posts: 115
From: staunton, va
Registered: Dec 2001
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posted 04-01-2002 11:47 AM
Wondering if anyone would mind running my combination for me. 351W, 9:5:1, Stock heads mildly ported, solid cam 244/252 @50 553/572 lift, 108 lobe sep, holley street dominator, 750 dp.
Also if you could run the same combination but with a hydralic 230/236 @50 519/523, 110 lobe sep, and edelbrock rpm air-gap it would be graetly appreciated. Thanks [This message has been edited by Jerry Piner (edited 04-01-2002).]
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67coupe
Gearhead Posts: 405
From: dallas NC usa
Registered: Nov 2000
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posted 04-01-2002 02:09 PM
richard ur right bout the wagon wheel at 2 grand the motor really wakes up around 3700 and pulls to bout 6800 i think the exaust is hurting me but it all works well on the street with a fairly loose 10 converter stalls up to bout 3500 if i want to but will pull around 2200 fairly well makes for a fun street toy and seems to be real streetable thanks------------------
Josh
67 coupe with 351c
94 Explorer
30 model A currently rustbucket
in process 67 convt with efi 5.0 and t5
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MrWesson22
Gearhead Posts: 1209
From: Dacula, GA
Registered: Sep 2000
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posted 04-01-2002 05:28 PM
I have the program and definately take its results with a grain of salt. It said my relatively mild, pump gas, 351C would make 523hp. I'm thinking it'll be more in the 450-460 range -- quite a discrepancy. Maybe I'm lowballing myself, but from other similar combos I've seen, I think 523 is way high.Edit: There is a program called engine analyzer that can be downloaded for free which gets MUCH more specific and I believe is also much more accurate. If I can find a link, I'll post it in this thread.
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Neal
Member #723
[email protected] AIM: MrWesson22
69 Gulfstream Aqua Grande
351C/Toploader 4sp [This message has been edited by MrWesson22 (edited 04-01-2002).]
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MrWesson22
Gearhead Posts: 1209
From: Dacula, GA
Registered: Sep 2000
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posted 04-01-2002 05:35 PM
Found it... http://www.performancetrends.com/download.htmIt's engine analyzer v3.0 Seems to be a good program to me -- gets VERY specific.
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Neal
Member #723
[email protected] AIM: MrWesson22 69 Gulfstream Aqua Grande
351C/Toploader 4sp
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richard bohm
Gearhead Posts: 373
From: tucson,az-luray,va
Registered: May 2001
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posted 04-01-2002 09:49 PM
jerry, the first combo is adequate for a street motor but not good.
hp 357 @ 6000
tq 340 @ 4500
the low end would be sluggish with out the top end being stong to compensate.
the second combo is much better
hp 363 @ 5500
tq 372 @ 4500
much better low end and a better tq curve. it still can be improved. using better heads(which i didnt do) would get you just over the 400 hp mark as well as having a better torque curve.
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