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Old 12-24-2005, 11:37 AM
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dyno predictions

O.K. guys, here is your chance to compare your dyno simulation software to actual dyno results. I am just about finished with my engine, and am goiing to the dyno within the next 2 weeks. If you would like to post your predictions, I will post the actual numbers when they are compiled. Here is the combo:

Chevrolet small block:
4.04 bore
3.75 stroke
10.2:1 static compression (flat top w/ 2 valve reliefs)
6.0 rod length
Trick Flow 23deg. aluminum heads, 2.02/1.60, cnc'ed chambers, port matched
full roller rockers
Crane hyd. roller 246/254 @.050, .558/.558, 112 lsa
edelbrock victor jr. intake manifold
750cfm mighty demon carb
dyno shop's headers (not sure of size)
MSD mech. adv. dist. w/ MSD 6AL2 box.

If you need more info, let me know and I will do my best to provide it.
Thanks, Jeff

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Old 12-24-2005, 11:48 AM
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My calculations with Dyno 2000

599 HP @6,500 RPM
499 FT/LBS @5,500 RPM
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Old 12-24-2005, 12:08 PM
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Im not going to take a guess at what your engine might make but I will say that 599 hp is WAY out of the question. Wont even come close.
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Old 12-24-2005, 02:32 PM
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What else can you tell us about the engine?
Piston ring type? low tension oil rings?
Oil pan configuration? Windage tray? Crankcase vacuum pump? Dry sump?
Water pump? Fan?
Intake lobe center as installed? Rev kit?
Header specifications? mufflers?
Engine operating temp? Intake air temp?
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Old 12-24-2005, 03:02 PM
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Based on similar combonations, I would say that it would be around 450-475 hp and 450 tq.

Adam
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Old 12-24-2005, 03:14 PM
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i agree in the 450 range

merry christmas to all, and to all a good night...
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Old 12-25-2005, 08:43 AM
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My Destop Dyno 2000 run says about 510 peak for HP and torque.
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Old 12-25-2005, 09:56 AM
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Quote:
Originally Posted by Blazin72
Im not going to take a guess at what your engine might make but I will say that 599 hp is WAY out of the question. Wont even come close.
I was thinking the same thing, but I plugged the # in right, I did substitute the heads with Dart Iron Eagles because I don't have anything for trick flow plugged in a airflow file.but trick flow heads are better. I put them up just to see what people would say.
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Old 12-25-2005, 11:17 AM
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I won't use DD since I can't know head flow or headers, I'm not familiar with those cam ramps, and I can't know how you set up ignition and fuel curves. But I agree with the 450 guess.
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Old 12-25-2005, 01:10 PM
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Quote:
Originally Posted by curtis73
I won't use DD since I can't know head flow or headers, I'm not familiar with those cam ramps, and I can't know how you set up ignition and fuel curves. But I agree with the 450 guess.
you can add head flow charts in Dyno 2000, the rest is pre set stuff other than you can change the exzaust/ headder type ( large tube, small tube, mufflers/no mufflers
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Old 12-25-2005, 02:53 PM
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Right, but first of all, I don't have flow numbers for those heads and he said they were gasket matched. Unless he posts actual flow numbers for HIS pair of heads any dyno simulation would be pointless.

He offered us an opportunity to see how close we could get with our simulations, but without actual head flows of his particular heads, I can't even get close. He said that he didn't know his header size. There is a huge difference on DD's simulation between large and small headers so without knowing, I can't simulate any more accurately than about 40hp.

I would have to contact the manufacturer of the cam before I knew which lifters to simulate since I don't know the mean ramp speeds.
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Old 12-25-2005, 03:49 PM
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Quote:
Originally Posted by zap60
O.K. guys, here is your chance to compare your dyno simulation software to actual dyno results. I am just about finished with my engine, and am goiing to the dyno within the next 2 weeks. If you would like to post your predictions, I will post the actual numbers when they are compiled. Here is the combo:

Chevrolet small block:
4.04 bore
3.75 stroke
10.2:1 static compression (flat top w/ 2 valve reliefs)
6.0 rod length
Trick Flow 23deg. aluminum heads, 2.02/1.60, cnc'ed chambers, port matched
full roller rockers
Crane hyd. roller 246/254 @.050, .558/.558, 112 lsa
edelbrock victor jr. intake manifold
750cfm mighty demon carb
dyno shop's headers (not sure of size)
MSD mech. adv. dist. w/ MSD 6AL2 box.

If you need more info, let me know and I will do my best to provide it.
Thanks, Jeff
Since we are just "bench racing".... as the old timers' used to say. lol

with optimized parts, perfect dyno tune on the verge of too lean and the verge of detonation, and perfect dyno atmospheric conditions=

385 cubes x 133% (because of the cam) = 511 hp (see below for answer)

Not many people race dynos..... and we all know that great dyno
power is wide open throttle only.

minus the iffy headers
minus the unknown air filter
minus the belt driven water pump load
minus alternator load
I'll give you an electric fan....

Depends on the atmospheric conditions and dyno calibration ...

I say with engine driven stuff hooked up 475 @ 6300 on 91 octane in the PERFECT TUNE CONDITIONS.

Unless you are lucky out of the box, and unless you do 20 tuning pulls..... I think you are going to get about 450 range on the engine dyno.

IMO Lobe separation 4* too wide
IMO Weak compression for the cam*

Why is your hotrod better than your house???
You can sleep in your hotrod, but you can't race your house....
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Old 12-25-2005, 03:59 PM
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Quote:
Originally Posted by curtis73
Right, but first of all, I don't have flow numbers for those heads and he said they were gasket matched. Unless he posts actual flow numbers for HIS pair of heads any dyno simulation would be pointless.

He offered us an opportunity to see how close we could get with our simulations, but without actual head flows of his particular heads, I can't even get close. He said that he didn't know his header size. There is a huge difference on DD's simulation between large and small headers so without knowing, I can't simulate any more accurately than about 40hp.

I would have to contact the manufacturer of the cam before I knew which lifters to simulate since I don't know the mean ramp speeds.
Try this site for fllow numbers http://users.erols.com/srweiss/tablehdc.htm#Chevy
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Old 12-25-2005, 04:38 PM
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There is a huge difference on DD's simulation between large and small headers so without knowing, I can't simulate any more accurately than about 40hp.

What is the difference between large and small headers in DD? What kind of mufflers do they use?
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Old 12-25-2005, 06:42 PM
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Quote:
Originally Posted by curtis73
Right, but first of all, I don't have flow numbers for those heads and he said they were gasket matched. Unless he posts actual flow numbers for HIS pair of heads any dyno simulation would be pointless.

He offered us an opportunity to see how close we could get with our simulations, but without actual head flows of his particular heads, I can't even get close. He said that he didn't know his header size. There is a huge difference on DD's simulation between large and small headers so without knowing, I can't simulate any more accurately than about 40hp.

I would have to contact the manufacturer of the cam before I knew which lifters to simulate since I don't know the mean ramp speeds.
Trick Flow 23 deg intake/exhaust

.100 51/58
.200 136/98
.300 191/136
.400 230/163
.500 253/177
.600 254/190

I found a site with a lot of aftermarket heads flow charts, and some stockers.
I just found his heads, on the printout of the site I have, don't know what good it will do for you or anybody else but I figured someone could use them. when I did the calculations, I used solid flat tappet for the cam type, someone on here mentioned that using that setting for engines that are roller cams, are more accurate, and that is why I did
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